CN113364880B - Information exchange method, system, electronic equipment and storage medium - Google Patents
Information exchange method, system, electronic equipment and storage medium Download PDFInfo
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- CN113364880B CN113364880B CN202110680116.4A CN202110680116A CN113364880B CN 113364880 B CN113364880 B CN 113364880B CN 202110680116 A CN202110680116 A CN 202110680116A CN 113364880 B CN113364880 B CN 113364880B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/18—End to end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/51—Discovery or management thereof, e.g. service location protocol [SLP] or web services
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Abstract
The invention provides an information exchange method, an information exchange system, electronic equipment and a storage medium. The information exchange method comprises the following steps: creating a sending directory of a sender for storing the first service information file and a receiving directory of a receiver; determining a link control protocol, and obtaining a first exchange file according to the link control protocol and a first service information file; updating the first exchange file according to a preset check rule to obtain a second exchange file; according to the link control information, a sliding window mechanism is adopted to start the link service; information exchange is carried out between the sender and the receiver through the second exchange file, so that the receiver receives the first service information file; and ending the link service according to a preset link service disconnection rule. The information exchange method, the system, the electronic equipment and the storage medium provided by the invention are not limited to the modulation and demodulation of physical signals on conventional channels such as cables, optical cables, radios and the like, so that the provided service can be orderly, stable and reliable.
Description
Technical Field
The present invention relates to the field of computer network communications technologies, and in particular, to an information exchange method, an information exchange system, an electronic device, and a storage medium.
Background
In the field of computer network communications, conventional implementations of communication link services provided by a data link layer are based on modulation and demodulation of physical signals over point-to-point dedicated lines or point-to-multipoint broadcast channels. In practice, communication link services should be implemented and provided by only having specific information exchange means such as telegrams, letter, e-mail, files, etc. between the communicating parties. However, due to technical complexity, some network information exchange technical schemes also have unstable operation and even serious design logic errors, have defects of inconsistent data, loss and damage to data integrity in the information exchange process, seriously even cause unstable operation, and bring great harm to information application and network information security.
Based on the method, the invention provides an information exchange method based on file exchange instead of conventional communication media channels such as cables, optical cables, radios and the like, so as to realize ordered, stable and reliable point-to-point communication link service, thereby meeting strict network information security requirements and transmission requirements.
It should be noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims at overcoming the defects in the prior art and providing an information exchange method, an information exchange system, electronic equipment and a storage medium so as to realize ordered, stable and reliable point-to-point communication link service, thereby meeting strict network information security requirements and transmission requirements.
In order to achieve the above purpose, the present invention is realized by the following technical scheme: an information exchange method for implementing a point-to-point communication link service, comprising the steps of:
s1: creating a sending directory of a sender and a receiving directory of a receiver, wherein the sending directory is used for storing a plurality of first service information files to be sent;
s2: determining a link control protocol, and obtaining a first exchange file according to the link control protocol and the first service information file;
s3: updating the first exchange file by using the verification information according to a preset verification rule to obtain a second exchange file;
s4: according to the link control information, a sliding window mechanism is adopted to start link service; information exchange is carried out between the sender and the receiver through the second exchange file, so that the receiver receives the first service information file and stores the first service information file in the receiving catalog;
S5: and ending the link service according to a preset link service disconnection rule.
Optionally, in step S2, the determining a link control protocol, and obtaining a first exchange file according to the link control protocol and the first service information file, where the method for determining a link control protocol includes:
generating a first control information file configured to control a link state of the link service;
adding exchange control information at the tail of the first service information file to obtain a corresponding second service information file;
wherein the first exchange file includes the first control information file and the second service information file.
Optionally, in step S3, the method for updating the first exchange file to obtain the second exchange file by using the verification information according to a preset verification rule includes:
adding MD5 check codes at the tail of the first control information file to obtain a second control information file;
adding MD5 check codes at the tail of the second service information file to obtain a third service information file;
wherein the second exchange file includes the second control information file and the third service information file.
Optionally, in step S4, the exchanging information between the sender and the receiver through the second exchange file further includes:
the receiver performs MD5 verification on the received second exchange file, and if the verification is passed, the receiver acquires the first control information file according to the second control information file and acquires the second service information file according to the third service information file;
otherwise, discarding the received second exchange file, and requesting the sender to resend the second exchange file.
Optionally, in step S4, according to the link control information, a sliding window mechanism is adopted to start a link service; and exchanging information between the sender and the receiver through the second exchange file, so that the receiver receives the first service information file and stores the first service information file in the receiving directory, comprising:
s41: establishing a link service according to the first control information file, and resetting the exchange control information;
s42: resetting a sending window parameter and a receiving window parameter of the sliding window mechanism, and selecting a second exchange file to be sent according to the link control information;
S43: the sender sends the second exchange file to be sent, and obtains a first link state of the link service according to a sending result and a preset sending parameter threshold; the receiver obtains a second link state of the link service according to the receiving window parameter, the receiving result and a preset receiving parameter threshold;
s44: judging whether the first link state and the second link state are both data exchange states or not;
if yes, judging whether the second exchange file to be sent exists or not: if not, executing step S5 to end the information exchange; if yes, updating the sending window parameter and the receiving window parameter, selecting a next second exchange file to be sent according to the link control information, and executing step S43;
if not, step S41 is performed.
Optionally, the first control information file includes a request to establish a link file, a confirmation to establish a link file, and a receipt data confirmation file;
the link control information comprises a sending sequence number and a receiving sequence number of the first exchange file;
in step S41, the method for establishing a link service according to the first control information file includes:
The sender/the receiver sends the request to establish a link file;
if the sender/the receiver receives the confirmation of establishing a link file from the receiver/the sender within a first time threshold, updating the link state of the link service to be a data exchange state;
the resetting the control exchange information includes resetting the transmission sequence number and the reception sequence number attached to the first service information file.
Optionally, the transmission window parameter includes a transmission sequence number counter, a transmission timer and a retransmission number counter, and the preset transmission parameter threshold includes a first count threshold and a second time threshold;
the receiving window parameters comprise a confirmation receiving sequence number counter, a receiving timer and a confirmation retransmission number counter, and the preset receiving parameter threshold comprises a second counting threshold and a third time threshold;
in step S43, the method for the sender to send the second exchange file to be sent and obtain the first link state of the link service according to the sending result and the first count threshold includes:
updating the sending sequence number of the second exchange file according to the value of the sending sequence number counter;
Transmitting the second exchange file according to the value of the transmission timer;
if the value of the retransmission time counter is less than or equal to the first counting threshold value and the time for receiving the data confirmation file returned by the receiver is less than or equal to the second time threshold value, setting the first link state as a data exchange state; otherwise, setting the first link state to be disconnected;
in step S43, the method for obtaining the second link state of the link service by the receiver according to the receiving window parameter, the receiving result and the preset receiving parameter threshold includes:
receiving the second exchange file according to the value of the receiving timer;
judging whether to process the second exchange file according to the value of the confirmation receiving sequence number counter and the receiving sequence number; if yes, carrying out data processing on the second exchange file according to the type of the second exchange file;
if the value of the retransmission number counter is less than or equal to the second counting threshold value and the second exchange file is received within the third time threshold value range, setting the second link state as a data exchange state; otherwise, the second link state is set to disconnected.
In order to achieve the above object, the present invention also provides an information exchange system including a sender, a receiver, and an information exchange control device; wherein the information exchange control device is configured to control the sender and the receiver to exchange information in a file manner;
the information exchange control device includes:
the receiving and transmitting directory creating unit is configured to create a transmitting directory of a transmitting party and a receiving directory of a receiving party, wherein the transmitting directory is used for storing a plurality of first service information files to be transmitted;
a link protocol determining unit configured to determine a link control protocol, and obtain a first switching file according to the link control protocol and the first service information file;
the verification information generating unit is configured to update the first exchange file by using the verification information according to a preset verification rule to obtain a second exchange file;
the information exchange executing unit is configured to start link service by adopting a sliding window mechanism according to the link control information; information exchange is carried out between the sender and the receiver through the second exchange file, so that the receiver receives the first service information file and stores the first service information file in the receiving catalog;
And the information exchange termination unit is configured to end the link service according to a preset link service disconnection rule.
In order to achieve the above object, the present invention further provides an electronic device, which includes a processor and a memory, the memory storing a computer program, the computer program implementing the information exchange method according to any one of the above when executed by the processor.
In order to achieve the above object, the present invention also provides a readable storage medium having stored therein a computer program which, when executed by a processor, implements the information exchange method of any one of the above.
Compared with the prior art, the information exchange method, the system, the electronic equipment and the storage medium provided by the invention have the following beneficial effects:
the information exchange method provided by the invention is used for realizing the point-to-point communication link service, and comprises the following steps: creating a sending directory of a sender and a receiving directory of a receiver, wherein the sending directory is used for storing a plurality of first service information files to be sent; determining a link control protocol, and obtaining a first exchange file according to the link control protocol and the first service information file; updating the first exchange file by using the verification information according to a preset verification rule to obtain a second exchange file; according to the link control information, a sliding window mechanism is adopted to start link service; information exchange is carried out between the sender and the receiver through the second exchange file, so that the receiver receives the first service information file and stores the first service information file in the receiving catalog; and ending the link service according to a preset link service disconnection rule. So configured, the information exchange method provided by the invention realizes the point-to-point ordered reliable communication link service based on file exchange by combining the mechanisms such as sliding window, data verification and the like for the sender and the receiver with the capability of file exchange, thereby realizing the corresponding communication link service without being limited to the modulation and demodulation of physical signals on conventional channels such as cables, optical cables, radios and the like, and further enabling the provided service to be ordered, stable and reliable.
Because the information exchange system, the electronic device and the storage medium provided by the invention belong to the same inventive concept as the information exchange method provided by the invention, the information exchange system, the electronic device and the storage medium have at least the same beneficial effects, and are not described in detail herein.
Drawings
FIG. 1 is a schematic diagram of an overall flow of an information exchange method according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating the evolution of a first service information file according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a specific flow of step S4 in FIG. 1;
fig. 4 is a schematic diagram of a transmission flow of a sender in an information exchange method according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a receiving flow of a receiving side of an information exchange method according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an information exchange system according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;
wherein reference numerals are as follows:
100-sender, 200-receiver, 300-information exchange control device, 301-receiving catalog creation unit, 302-link protocol determination unit, 303-check information generation unit, 304-information exchange execution unit, 305-information exchange termination unit;
A processor-401; a communication interface-402; a memory-403; communication bus-404.
Detailed Description
To make the objects, advantages and features of the present invention more apparent, the information exchange method, system, electronic device and storage medium according to the present invention will be described in further detail with reference to the accompanying drawings. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. It should be understood that the drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. Specific design features of the invention disclosed herein, including for example, specific dimensions, orientations, positions, and configurations, will be determined in part by the specific intended application and use environment. In the embodiments described below, the same reference numerals are used in common between the drawings to denote the same parts or parts having the same functions, and the repetitive description thereof may be omitted. In this specification, like reference numerals and letters are used to designate like items, and thus once an item is defined in one drawing, no further discussion thereof is necessary in subsequent drawings.
These terms so used may be substituted where appropriate. Similarly, if a method described herein comprises a series of steps, and the order of the steps presented herein is not necessarily the only order in which the steps may be performed, and some of the described steps may be omitted and/or some other steps not described herein may be added to the method.
The present example provides an information exchange method for implementing a peer-to-peer communication link service, refer to fig. 1 and fig. 2, where fig. 1 is a general flow diagram of the information exchange method provided by an embodiment of the present invention, and fig. 2 is a first service information file evolution diagram of the information exchange method provided by an embodiment of the present invention. As can be seen from fig. 1, the information exchange method provided in this embodiment includes the following steps:
s1: and creating a sending directory of the sender and a receiving directory of the receiver, wherein the sending directory is used for storing a plurality of first service information files to be sent.
As will be appreciated by those skilled in the art, the first service information file includes a file obtained by converting link information required to be transmitted by a link service user thereof by a transmitting side. Further, the two parties of the information exchange method are mutually, for example, in a specific embodiment, the method includes two parties of A and B, wherein at a certain moment, A is a sender, and B is a receiver; at another moment, B is the sender and a is the receiver. Furthermore, when the information exchange method provided by the invention is implemented, the receiving catalogue and the sending catalogue of the two parties with the file exchange capability can be agreed; one party sends the file to be sent to the other party, the file is put into the sending catalog of the other party, and the other party takes the catalog as the receiving catalog of the other party and correspondingly reads the file; and vice versa. Furthermore, in the case that the receiver cannot directly access the sender file directory, the indirect access of the file directory can be further realized by means of services such as file relay forwarding of a third party.
So configured, the information exchange method provided by the invention can well realize the point-to-point communication link service based on file exchange instead of modulation and demodulation of physical signals on a conventional channel.
S2: and determining a link control protocol, and obtaining a first exchange file according to the link control protocol and the first service information file.
Specifically, in one preferred embodiment, the method for determining a link control protocol includes the following steps:
generating a first control information file configured to control a link state of the link service;
and adding exchange control information at the tail of the first service information file to obtain a corresponding second service information file. Please refer to fig. 2 for the second service information file and the first service information file.
Wherein the first exchange file includes the first control information file and the second service information file. The first control information file and the second service information file agree on respective file types according to the link control protocol so as to be distinguished when being analyzed by a receiver.
Specifically, in one preferred embodiment, the sender assigns a sending sequence number to the sent first information service file, that is, a sequence number of the sent file, and simultaneously puts a receiving sequence number, that is, a sending sequence number that the next file is expected to be sent back from the receiver. Preferably, the transmission sequence number and the reception sequence number are each expressed in a certain number of bits, sequentially increasing, automatically overflowing to zero, sequentially increasing, and so cycling. By the configuration, the condition that the link information required to be sent by the sender/receiver is out of order or lost at the receiver/sender can be avoided, and the orderly service provided by the link user can be ensured.
S3: and updating the first exchange file by using the verification information according to a preset verification rule to obtain a second exchange file.
Specifically, in one preferred embodiment, the method for obtaining the second exchange file includes:
adding MD5 check codes at the tail of the first control information file to obtain a second control information file;
and adding an MD5 check code at the end of the second service information file to obtain a third service information file. Please refer to fig. 2 for the third service information file and the first service information file.
Wherein the second exchange file includes the second control information file and the third service information file.
It can be seen that the sender sends the first exchange file to be exchanged together with a specific check code, such as MD5 check code, in combination with using a data check technique. The receiving party recalculates the check code accordingly, and if an inconsistency with the appended check code is found, the damage is determined to occur. It is to be understood that the MD5 check code is merely illustrative of a preferred embodiment, and in other embodiments, the check code includes, but is not limited to, CRC_32, SHA1 codes, etc., as the invention is not limited in any way. So configured, the information exchange method provided by the invention can avoid the possibility of being damaged when the second exchange file received by the receiver is damaged. Thereby, the exchanged information (provided services) can be ensured to be reliable.
S4: according to the link control information, a sliding window mechanism is adopted to start link service; and exchanging information between the sender and the receiver through the second exchange file, so that the receiver receives the first service information file and stores the first service information file in the receiving directory.
Preferably, in one exemplary embodiment, in step S4, the exchanging information between the sender and the receiver through the second exchange file further includes:
the receiver performs MD5 verification on the received second exchange file, and if the verification is passed, the receiver acquires the first control information file according to the second control information file and acquires the second service information file according to the third service information file;
otherwise, discarding the received second exchange file, and requesting the sender to resend the second exchange file.
Therefore, according to the information exchange method provided by the invention, for the received file, any party firstly performs verification operation; the data which cannot pass the verification is directly discarded, so that the automatic retransmission function of the sliding window mechanism is triggered; if the verification is passed, the received file is complete and not destroyed, and the control information in a specific format and the link user information possibly contained in the control information can be further processed according to the link control protocol. So configured, the integrity and consistency of the exchanged files can be ensured in combination with the use of data verification techniques.
S5: and ending the link service according to a preset link service disconnection rule.
Therefore, the information exchange method provided by the invention is based on the point-to-point communication link service of file exchange, namely: one party converts the link information required to be sent by the link service user into corresponding files, and sends the corresponding files to the other party based on file exchange; the other party correspondingly converts the received file into link information and submits the link information to the user of the link service; and vice versa. So configured, the information exchange method provided by the invention realizes the point-to-point ordered reliable communication link service based on file exchange by combining the mechanisms such as sliding window, data verification and the like for the sender and the receiver with the capability of file exchange, thereby realizing the corresponding communication link service without being limited to the modulation and demodulation of physical signals on conventional channels such as cables, optical cables, radios and the like, and further enabling the provided service to be ordered, stable and reliable.
Specifically, in one embodiment, in step S4, according to the link control information, a sliding window mechanism is adopted to start a link service; and exchanging information between the sender and the receiver through the second exchange file, so that the receiver receives the first service information file and stores the first service information file in the receiving directory, refer to fig. 3, and fig. 3 is a specific flowchart of step S4 in fig. 1 of the information exchange method according to an embodiment of the present invention. As can be seen from fig. 3, step S4 comprises the steps of:
S41: and establishing a link service according to the first control information file, and resetting the exchange control information. In particular, the sliding window mechanism involves link control, including establishment of a link and release of a link, corresponding to activation and deactivation services, respectively, of a point-to-point communication link. For the request to start the link service, a control file for sending the request to establish the link connection is formed, the request to establish the link is indicated, if the return file for confirming to establish the link or requesting to establish the link is received in a limited time, the link is established successfully, and the link enters a conventional data exchange state. If either party receives a file indicating a request to establish a link, it uniformly forms a file that sends back an acknowledgement to establish the link, the link enters a conventional data exchange state, and indicates to its link user (including sender and receiver) that the link is ready.
Preferably, in one exemplary embodiment, the first control information file includes a request to establish a link file, a confirmation to establish a link file, and a receipt data confirmation file; the link control information includes a transmission sequence number and a reception sequence number of the first exchange file.
Specifically, the method for establishing the link service according to the first control information file includes:
The sender/the receiver sends the request to establish a link file;
and if the sender/the receiver receives the first control information file for confirming the establishment of the link by the receiver/the sender within the first time threshold, updating the link state of the link service to be a data exchange state. Wherein resetting the control exchange information includes resetting the transmission sequence number and the reception sequence number attached to the first service information file.
According to the basic principle of the sliding window mechanism, a sender maintains a continuous serial number of a file which is allowed to be sent at any time, which is called a sending window; at the same time, the receiving party also maintains a serial number of the file which is continuously allowed to be received, which is called a receiving window. The sequence numbers within the sender window represent those files that have been sent, but have not yet been acknowledged, or those files that can be sent. The sending window indicates that the sender can continuously send out the file of the sending window under the condition that the confirmation of the receiver is not received. But the already transmitted file also needs to be temporarily reserved for use in time-out retransmissions before the acknowledgement data acknowledgement file is received. Since the receiving side needs to determine whether the received file is a newly transmitted file or a retransmitted file, the transmitting side adds a sequence number to each file.
Those skilled in the art will appreciate that the resetting of the sliding window mechanism, such as resetting sequence number counters, timeout timers, retransmission counters, etc., should be performed each time the link transitions to the data exchange state.
S42: resetting the sending window parameter and the receiving window parameter of the sliding window mechanism, and selecting a second exchange file to be sent according to the link control information.
S43: the sender sends the second exchange file to be sent, and obtains a first link state of the link service according to a sending result and a preset sending parameter threshold; and the receiver obtains a second link state of the link service according to the receiving window parameter, the receiving result and a preset receiving parameter threshold.
Preferably, in one exemplary embodiment, the transmission window parameter includes a transmission sequence number counter, a transmission timer, and a retransmission number counter, and the preset transmission parameter threshold includes a first count threshold and a second time threshold.
The receiving window parameters comprise a confirmation receiving sequence number counter, a receiving timer and a confirmation retransmission number counter, and the preset receiving parameter threshold comprises a second counting threshold and a third time threshold.
Specifically, the method for the sender to send the second exchange file to be sent and obtain the first link state of the link service according to the sending result and the first count threshold includes:
updating the sending sequence number of the second exchange file according to the value of the sending sequence number counter;
transmitting the second exchange file according to the value of the transmission timer;
if the value of the retransmission time counter is less than or equal to the first counting threshold value and the time for receiving the data confirmation file returned by the receiver is less than or equal to the second time threshold value, setting the first link state as a data exchange state; otherwise, the first link state is set to disconnected.
Further, the method for the receiver to obtain the second link state of the link service according to the receiving window parameter, the receiving result and the preset receiving parameter threshold value includes:
receiving the second exchange file according to the value of the receiving timer;
judging whether to process the second exchange file according to the value of the confirmation receiving sequence number counter and the receiving sequence number: if yes, carrying out data processing on the second exchange file according to the type of the second exchange file;
If the value of the retransmission number counter is less than or equal to the second counting threshold value and the second exchange file is received within the third time threshold value range, setting the second link state as a data exchange state; otherwise, the second link state is set to disconnected.
It will be understood by those skilled in the art that in the process of implementing the present invention, a sender may not stop waiting for a response file after sending one file, but may continuously send a plurality of files, and even if no acknowledgement of the receiver is received in the continuous sending process, the sender may continue to send, but the sender sets a timeout timer every time a file is sent. As long as the acknowledgement of the recipient has not been received within the set timeout, the corresponding file is to be retransmitted. The invention is not limited in any way in this regard. Such as: when the sender sends N files, if it is found that the previous file of the N files has not returned its acknowledgement information after the timer has expired, the previous file is determined to be erroneous or lost, and the sender has to resend the erroneous file and the files thereafter.
Likewise, the recipient, if it finds an erroneous file, does not receive the subsequent file any more, even if it arrives correctly, which is obviously wasteful. The more efficient strategy is to select retransmission, i.e. when the receiver finds that a certain file is wrong, the correct file that is sent further on can not be delivered to the higher layer of the receiver immediately, but the receiver can still receive, store in the receiving buffer, and at the same time, require the sender to retransmit the wrong file. Once the retransmitted file is received, the other files stored in the buffer area can be processed in the correct sequence according to the requirement.
S44: judging whether the first link state and the second link state are both data exchange states or not;
if yes, judging whether the second exchange file to be sent exists or not: if not, executing step S5 to end the information exchange; if yes, updating the sending window parameter and the receiving window parameter, selecting a next second exchange file to be sent according to the link control information, and executing step S43;
if not, step S41 is performed.
For ease of understanding, the transmission flow of the transmitting side and the reception flow of the receiving side are described in the form of flowcharts, respectively. Specifically, please refer to fig. 4 and fig. 5, wherein fig. 4 is a schematic diagram of a transmission flow of a sender of an information exchange method according to an embodiment of the present invention; fig. 5 is a schematic diagram of a receiving flow of a receiving side of an information exchange method according to an embodiment of the present invention. In particular, as can be seen from fig. 1, fig. 4 and fig. 5, the information exchange method provided by the present invention is not limited to specific timing of adding the exchange control information and the check information, and may be added in advance, or may be added in the process of transmission (before transmission), that is: the control exchange information and the verification information are not limited to be added before step S4 or before the file is transmitted during the specific execution of step S4 in steps S2 and S3.
As can be seen from fig. 1 to fig. 5, in the information exchange method provided by the present invention, a sliding window mechanism is adopted, and by reasonably setting timeout timers (a first time threshold, a second time threshold and a second time threshold), a sender confirms each transmitted file in time by a receiver, that is, receives the file transmitted from the receiver in time, and appends a receiving sequence number after a transmitting sequence number in the file of the sender. So configured, the information exchange method provided by the invention has an error detection mechanism for possibly losing the exchanged file, and can timely find out whether the exchanged file is lost.
Further, in the information exchange method provided by the invention, once the sender confirms that the sent file is lost, the sender automatically starts retransmission and continues to confirm the receiver in a time limit; if the loss is again considered, a new round of retransmission is automatically started. So configured, the information exchange method provided by the invention can ensure that the provided service is reliable.
Still further, according to the information exchange method provided by the invention, the received repeated submitted file can be actively discarded through the sending sequence number and the receiving sequence number. The information exchange method provided by the invention can ensure that the provided service is stable.
Still further, the information exchange method provided by the invention can improve the communication efficiency and realize the flow control of both communication parties by setting the sending window k, the delay confirmation window w, the receiving window and the like with specific proper sizes.
Furthermore, the information exchange method provided by the invention can correspondingly record the retransmission times and limit the upper limit of the retransmission times; once the upper limit of the number of retransmissions is reached, the release procedure of the link may also be triggered, and thus result in the implementation of a reset of the sliding window mechanism. So configured, the information exchange method provided by the invention can also transmit the file with specific control purpose for the relatively idle link in a limited time, and can discover the possible abnormality of the link in time.
Still another embodiment of the present invention further provides an information exchange system, referring to fig. 6, and fig. 6 is a schematic structural diagram of the information exchange system according to an embodiment of the present invention. As can be seen from fig. 6, the information exchange system provided in this embodiment includes a sender 100, a receiver 200, and an information exchange control apparatus 300; wherein the information exchange control apparatus 300 is configured to control the sender and the receiver to exchange information in a file manner. The information exchange control apparatus 300 includes a transceiving directory creation unit 301, a link protocol determination unit 302, a verification information generation unit 303, an information exchange execution unit 304, and an information exchange termination unit 305.
Specifically, the transceiver catalog creation unit 301 is configured to create a sending catalog of the sender 100 and a receiving catalog of the receiver, where the sending catalog is used to store a number of first service information files to be sent. The link protocol determining unit 302 is configured to determine a link control protocol, and obtain a first exchange file according to the link control protocol and the first service information file. The verification information generating unit 303 is configured to update the first exchange file with verification information according to a preset verification rule, so as to obtain a second exchange file. The information exchange executing unit 304 is configured to start a link service by adopting a sliding window mechanism according to the link control information; and exchanging information between the sender and the receiver through the second exchange file, so that the receiver receives the first service information file and stores the first service information file in the receiving directory. The information exchange termination unit 305 is configured to terminate the link service according to a preset link service disconnection rule. So configured, the information exchange system provided by the invention can realize ordered, stable and reliable point-to-point communication link service based on file exchange, thereby meeting strict network information security requirements and transmission requirements.
It will be understood by those skilled in the art that, when the information exchange system provided by the present invention is specifically deployed, part of the constituent units in the information exchange control apparatus 300 may be located at the sender 100, or may be located at the receiver 200, or may, of course, be located at a third party capable of being communicatively connected to the sender 100 and the receiver 200, and should be reasonably set according to the actual working conditions, which is not limited in the present invention.
It should be noted that the apparatus and methods disclosed in the embodiments herein may be implemented in other ways. The apparatus embodiments described above are merely illustrative, for example, flow diagrams and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments herein. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments herein may be integrated together to form a single part, or the modules may exist alone, or two or more modules may be integrated to form a single part.
Based on the same inventive concept, the present invention further provides an electronic device, please refer to fig. 7, which schematically shows a block structure schematic diagram of the electronic device according to an embodiment of the present invention. As shown in fig. 7, the electronic device comprises a processor 401 and a memory 403, the memory 403 having stored thereon a computer program which, when executed by the processor 401, implements the steps of the information exchange method described above.
As shown in fig. 7, the electronic device further comprises a communication interface 402 and a communication bus 404, wherein the processor 401, the communication interface 402, and the memory 403 perform communication with each other via the communication bus 404. The communication bus 404 may be a peripheral component interconnect standard (Peripheral Component Interconnect, PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, EISA) bus, among others. The communication bus 404 may be classified as an address bus, a data bus, a control bus, or the like. For ease of illustration, the figures are shown with only one bold line, but not with only one bus or one type of bus. The communication interface 402 is used for communication between the electronic device and other devices.
The processor 401 referred to in this disclosure may be a central processing unit (Central Processing Unit, CPU), other general purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, and the processor 401 is a control center of the electronic device, and connects various parts of the entire electronic device using various interfaces and lines.
The memory 403 may be used to store the computer program, and the processor 401 may implement various functions of the electronic device by running or executing the computer program stored in the memory 403 and invoking data stored in the memory 403.
The memory 403 may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The present invention also provides a readable storage medium having stored therein a computer program which, when executed by a processor, enables the information exchange method described above to be implemented.
The readable storage media of embodiments of the present invention may take the form of any combination of one or more computer-readable media. The readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer hard disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Computer program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
It can be seen that the information exchange method, the electronic device and the storage medium provided by the invention have the following advantages:
1. the invention provides an information exchange method, electronic equipment and a storage medium: for both parties with file exchange capability, point-to-point communication link service is realized based on file exchange rather than modulation and demodulation of physical signals on a conventional channel.
2. The invention provides an information exchange method, electronic equipment and a storage medium: by adding control information to the exchanged files, a link control protocol is realized, and by combining mechanisms such as sliding window, timeout retransmission and the like, the risks of out-of-order and even loss of communication link service can be avoided, and the point-to-point ordered communication link service is realized.
3. The invention provides an information exchange method, electronic equipment and a storage medium: the exchanged file is further added with a specific check code, such as MD5 check code, and the data check technology is combined, so that the exchanged file can be timely found to be damaged or destroyed, and the integrity and consistency of the exchanged file can be ensured.
In summary, the information exchange method provided by the invention combines the mechanisms of sliding window, data verification and the like for the sender and the receiver with the capability of file exchange, and realizes the point-to-point ordered reliable communication link service based on file exchange, thereby realizing the corresponding communication link service without being limited to the modulation and demodulation of physical signals on conventional channels such as cables, optical cables, radios and the like, and further enabling the provided service to be ordered, stable and reliable.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
In summary, the foregoing embodiments describe in detail different configurations of the information exchange method, system, electronic device and storage medium, and of course, the foregoing description is merely illustrative of preferred embodiments of the present invention, and not intended to limit the scope of the present invention, which includes but is not limited to the configurations set forth in the foregoing embodiments, and those skilled in the art can make any changes and modifications according to the foregoing disclosure, which are within the scope of the appended claims.
Claims (10)
1. An information exchange method for implementing a point-to-point communication link service, comprising the steps of:
s1: creating a sending directory of a sender and a receiving directory of a receiver, wherein the sending directory is used for storing a plurality of first service information files to be sent;
s2: determining a link control protocol, and obtaining a first exchange file according to the link control protocol and the first service information file;
s3: updating the first exchange file by using the verification information according to a preset verification rule to obtain a second exchange file;
s4: according to the link control information, a sliding window mechanism is adopted to start the link service; information exchange is carried out between the sender and the receiver through the second exchange file, so that the receiver receives the first service information file and stores the first service information file in the receiving catalog;
S5: and ending the link service according to a preset link service disconnection rule.
2. The information exchange method according to claim 1, wherein in step S2, the determining a link control protocol and obtaining a first exchange file according to the link control protocol and the first service information file, wherein the determining a link control protocol includes:
generating a first control information file configured to control a link state of the link service;
adding exchange control information at the tail of the first service information file to obtain a corresponding second service information file;
wherein the first exchange file includes the first control information file and the second service information file.
3. The information exchange method according to claim 2, wherein in step S3, the method for updating the first exchange file with the verification information according to the preset verification rule to obtain the second exchange file includes:
adding MD5 check codes at the tail of the first control information file to obtain a second control information file;
adding MD5 check codes at the tail of the second service information file to obtain a third service information file;
Wherein the second exchange file includes the second control information file and the third service information file.
4. The information exchange method according to claim 3, wherein in step S4, the information exchange is performed between the sender and the receiver through the second exchange file, further comprising:
the receiver performs MD5 verification on the received second exchange file, and if the verification is passed, the receiver acquires the first control information file according to the second control information file and acquires the second service information file according to the third service information file;
otherwise, discarding the received second exchange file, and requesting the sender to resend the second exchange file.
5. The information exchange method according to claim 3, wherein in step S4, the link service is started by using a sliding window mechanism according to the link control information; and exchanging information between the sender and the receiver through the second exchange file, so that the receiver receives the first service information file and stores the first service information file in the receiving directory, comprising:
S41: establishing a link service according to the first control information file, and resetting the exchange control information;
s42: resetting a sending window parameter and a receiving window parameter of the sliding window mechanism, and selecting a second exchange file to be sent according to the link control information;
s43: the sender sends the second exchange file to be sent, and obtains a first link state of the link service according to a sending result and a preset sending parameter threshold; the receiver obtains a second link state of the link service according to the receiving window parameter, the receiving result and a preset receiving parameter threshold;
s44: judging whether the first link state and the second link state are both data exchange states or not;
if yes, judging whether the second exchange file to be sent exists or not: if not, executing step S5 to end the information exchange; if yes, updating the sending window parameter and the receiving window parameter, selecting a next second exchange file to be sent according to the link control information, and executing step S43;
if not, step S41 is performed.
6. The information exchange method according to claim 5, wherein the first control information file includes a request to establish a link file, a confirmation to establish a link file, and a receipt data confirmation file;
The link control information comprises a sending sequence number and a receiving sequence number of the first exchange file;
in step S41, the method for establishing a link service according to the first control information file includes:
the sender/the receiver sends the establishment link file;
if the sender/the receiver receives the confirmation returned by the receiver/the sender to establish a link file within a first time threshold, updating the link state of the link service to be a data exchange state;
resetting the exchange control information includes resetting the transmission sequence number and the reception sequence number attached to the first service information file.
7. The information exchange method according to claim 6, wherein the transmission window parameter includes a transmission sequence number counter, a transmission timer, and a retransmission number counter, and the preset transmission parameter threshold includes a first count threshold and a second time threshold;
the receiving window parameters comprise a confirmation receiving sequence number counter, a receiving timer and a confirmation retransmission number counter, and the preset receiving parameter threshold comprises a second counting threshold and a third time threshold;
in step S43, the method for the sender to send the second exchange file to be sent and obtain the first link state of the link service according to the sending result and the first count threshold includes:
Updating the sending sequence number of the second exchange file according to the value of the sending sequence number counter;
transmitting the second exchange file according to the value of the transmission timer;
if the value of the retransmission time counter is less than or equal to the first counting threshold value and the time for receiving the data confirmation file returned by the receiver is less than or equal to the second time threshold value, setting the first link state as a data exchange state; otherwise, setting the first link state to be disconnected;
in step S43, the method for obtaining the second link state of the link service by the receiver according to the receiving window parameter, the receiving result and the preset receiving parameter threshold includes:
receiving the second exchange file according to the value of the receiving timer;
judging whether to process the second exchange file according to the value of the confirmation receiving sequence number counter and the receiving sequence number; if yes, carrying out data processing on the second exchange file according to the type of the second exchange file;
if the value of the retransmission number counter is less than or equal to the second counting threshold value and the second exchange file is received before the third time threshold value is reached, setting the second link state as a data exchange state; otherwise, the second link state is set to disconnected.
8. An information exchange system is characterized by comprising a sender, a receiver and an information exchange control device; wherein the information exchange control device is configured to control the sender and the receiver to exchange information in a file manner;
the information exchange control device includes:
the receiving and transmitting directory creating unit is configured to create a transmitting directory of a transmitting party and a receiving directory of a receiving party, wherein the transmitting directory is used for storing a plurality of first service information files to be transmitted;
a link protocol determining unit configured to determine a link control protocol, and obtain a first switching file according to the link control protocol and the first service information file;
the verification information generating unit is configured to update the first exchange file by using the verification information according to a preset verification rule to obtain a second exchange file;
the information exchange execution unit is configured to start link service by adopting a sliding window mechanism according to the link control information; information exchange is carried out between the sender and the receiver through the second exchange file, so that the receiver receives the first service information file and stores the first service information file in the receiving catalog;
And the information exchange termination unit is configured to end the link service according to a preset link service disconnection rule.
9. An electronic device comprising a processor and a memory, the memory having stored thereon a computer program which, when executed by the processor, implements the information exchange method of any of claims 1 to 7.
10. A readable storage medium, characterized in that the readable storage medium has stored therein a computer program which, when executed by a processor, implements the information exchange method of any one of claims 1 to 7.
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