CN101572709B - Switching method, system, server and client device of socket connection - Google Patents
Switching method, system, server and client device of socket connection Download PDFInfo
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- CN101572709B CN101572709B CN2009100858168A CN200910085816A CN101572709B CN 101572709 B CN101572709 B CN 101572709B CN 2009100858168 A CN2009100858168 A CN 2009100858168A CN 200910085816 A CN200910085816 A CN 200910085816A CN 101572709 B CN101572709 B CN 101572709B
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Abstract
The invention provides a switching method, a system, a server and a client device of Socket connection; wherein the method includes: the transport layer module of a first server receives a switching request message from a second server, the switching request message carries the address and information of a listening port; the transport layer module of the first server sends a switching initial message to the transport layer module of the client according to the switching request message, the switching initial message carries the address and information of the listening port of the second server; the transport layer module of the client cuts the Socket connection with the transport layer module of the first server according to the switching initial message; and the Socket connection with the transport layer module of the second server is built according to the address and information of the listening port of the second server in the switching initial message. The invention can realize transparent Socket connection switching on the application layer and relives the burden of the application layer.
Description
Technical field
The present invention relates to the distributed apparatus technical field, particularly changing method, system, server and client side's equipment of socket (Socket) connection.
Background technology
In the prior art; A veneer comprises the application layer module on upper strata and the transport layer module of lower floor; Adopt a kind of typical interprocess communication (IPC) mechanism between the transport layer module of two veneers, promptly Socket connects, for the application layer module on upper strata provides reliable communication service.As shown in Figure 1, Fig. 1 is the structure and the annexation sketch map of veneer in the prior art.Socket connects the end points that process communication is provided in fact, and before process communication, both sides at first must create a socket separately, could set up Socket afterwards and connect.Socket connection between socket is set up process and is divided into three steps: server is monitored, and client-requested is connected affirmation with Socket.
The both sides of communication adopt client/server model; Form the backup relation between a plurality of servers; If current legacy server breaks down, then need the Socket connection be switched on the new server, show the handoff procedure of new legacy server in the prior art like Fig. 2.
Above-mentioned Socket handoff procedure needs the intervention control of application layer module usually; Detailed process is: the application layer module of client is sent out code to transport layer module; According to this out code, the Socket that the transport layer module of client is initiatively closed between the transport layer module with legacy server is connected; Afterwards, the application layer module of client is in due course and sends link order to transport layer module, has comprised the positional information of new server in this link order; According to this link order, the new Socket that the transport layer module of client is initiatively set up between the transport layer module with new server is connected.Because existing Socket connects the intervention that handoff procedure needs application layer module; This just needs application layer module to understand the positional information of each server; And on the opportunity of clearly switching, these requirements have all increased the complexity of application program, have increased the weight of the burden of application layer module.
Summary of the invention
The present invention proposes the changing method that a kind of Socket connects, and this method is transparent fully to application layer, can alleviate the burden of application layer.
The present invention also proposes a kind of system, server and client side's equipment, can realize the transparent fully Socket of application layer is connected switching, alleviates the burden of application layer.
Technical scheme of the present invention is achieved in that
The changing method that a kind of Socket connects comprises:
The transport layer module of first server receives the handoff request message from second server, and said handoff request message is carried the address and the listening port information of second server;
According to said handoff request message, the transport layer module of first server is sent to the transport layer module of client and is switched beginning message, and said switching begins address and the listening port information that message is carried second server;
The transport layer module of client receives after said switching begins message, suspends to the application layer module of client and sends data, and begin message according to said switching, and the Socket that breaks off between the transport layer module with first server is connected; Begin the address and the listening port information of the second server in the message according to said switching; The Socket that sets up between the transport layer module with second server is connected; And after the Socket between the transport layer module of setting up with second server is connected, revert to the application layer module transmission data of client again.
The switched system that a kind of Socket connects comprises: first server, second server and client; Wherein, said first server comprises first transport layer module, and said second server comprises second transport layer module, and said client comprises client transmissions layer module;
First transport layer module is used to receive the handoff request message from second server, and said handoff request message is carried the address and the listening port information of second server; According to said handoff request message, send switching beginning message to client transmissions layer module, said switching begins address and the listening port information that message is carried second server;
Client transmissions layer module after being used to receive said switching and beginning message, suspended to the application layer module of client and sent data, and begin message according to said switching, break off with said first transport layer module between Socket be connected; Begin the address and the listening port information of the second server in the message according to said switching; Set up with second transport layer module between Socket be connected; And after the Socket between the transport layer module of setting up with second server is connected, revert to the application layer module transmission data of client again.
A kind of server comprises: first transport layer module;
Said first transport layer module is used to receive the handoff request message from second server, and said handoff request message is carried the address and the listening port information of second server; According to said handoff request message, send switching beginning message to client transmissions layer module, said switching begins address and the listening port information that message is carried second server.
A kind of server comprises: second application layer module and second transport layer module; Wherein,
Second application layer module is used for sending switching command to second transport layer module;
Second transport layer module is used for generating handoff request message according to said switching command, and said handoff request message is carried the address and the listening port information of the said server that second transport layer module preserves in advance; Also be used for said handoff request message is sent to the transport layer module of first server.
A kind of client device comprises: client transmissions layer module;
Said client transmissions layer module is used for receiving and switches beginning message, and this switching begins address and the listening port information that message is carried second server; After being used to receive said switching and beginning message, suspend to the application layer module of client and send data, and break off with first transport layer module between Socket be connected; Begin the address and the listening port information of the second server in the message according to said switching; Set up with second transport layer module between Socket be connected; And after the Socket between the transport layer module of setting up with second server is connected, revert to the application layer module transmission data of client again.
It is thus clear that; Changing method, system, server and client side's equipment that the Socket that the present invention proposes connects; Transport layer module by first server (legacy server) comprises the address of second server (new server) and the handoff request message of listening port information to the transport layer module transmission of client, starts Socket and switches; The Socket that the transport layer module of client is broken off between the transport layer module with first server is connected; The Socket that sets up between the transport layer module with second server is connected; Realized the Socket of layer transparent is connected switching; Whole handoff procedure does not need the participation of application layer module, has alleviated the burden of application layer.
Description of drawings
Fig. 1 is the structure and the annexation sketch map of veneer in the prior art;
Fig. 2 is the handoff procedure flow chart of new legacy server in the prior art;
Fig. 3 is a Socket connection switching method flow chart of the present invention;
Fig. 4 connects the message sequence chart in the handoff procedure for Socket of the present invention;
The realization flow figure that Fig. 5 switches for embodiment of the invention Socket.
Embodiment
The embodiment of the invention proposes a kind of Socket and connects changing method, and referring to Fig. 3, Fig. 3 is a Socket connection switching method flow chart of the present invention.In Fig. 3; Exist Socket to be connected between the transport layer module of the transport layer module of client and legacy server (being also referred to as first server) under the initial condition; Afterwards, client connects this Socket the transport layer module that switches to new server (being also referred to as second server).This method comprises:
Step 301: the transport layer module of legacy server receives handoff request (switchrequest) message of the server of making a fresh start; Trigger legacy server and start handoff procedure, carried the address and listening port information (listening port of new legacy server generally is consistent) of new server in this switch request message.
In this step, switch request message can be sent when new startup of server is accomplished; In concrete the realization; Can send switching command through setsockopt interface message or ioctl interface message to the transport layer module of new server by the application layer module of new server; The transport layer module of new server generates switch request message according to this switching command, carries the address and the listening port information of the new server that transport layer module preserves in advance in this switch request message; The transport layer module of new server is with the transport layer module of this switch request information and sending to legacy server;
Step 302: according to the switch request message that receives in the step 301; The transport layer module of legacy server is sent beginning (switch start) message, the address and the listening port information of carrying new server in this switchstart message switched to the transport layer module of client.Switch start message has been served as the server redirection function, and the client that is connected with legacy server all can be received this message and know the address and the listening port information of new server.
Step 303: the transport layer module of client is according to the switch start message that receives in the step 302, and the Socket that breaks off between the transport layer module with legacy server is connected.Break off the transport layer module inside that operates in of Socket connection and realize the not perception of application layer module on upper strata.
Step 304: the transport layer module of client is according to address and the listening port information of the new server that carries in the switch start message that receives in the step 302, and the Socket that sets up between the transport layer module with new server is connected.The operation of setting up the Socket connection is also in the inner realization of transport layer module, the not perception of application layer module on upper strata.
In above-mentioned steps 303 and the step 304, break off Socket and connect and set up the process that Socket is connected and be similar to the disconnection in the Transmission Control Protocol and the process that connects, adopt 4-Way Handshake to break off connection, three-way handshake connects.Detailed process is as shown in Figure 4, and Fig. 4 comprises for Socket of the present invention connects the message sequence chart in the handoff procedure:
Step 401: the transport layer module of legacy server is sent switchstart message to the transport layer module of client;
Carry out 4-Way Handshake afterwards and break off connection procedure, specifically comprise step 402～step 405:
Step 402: the transport layer module of client is sent FIN message to the transport layer module of legacy server, requires to break off in the original Socket connection by the connection of client on the legacy server direction;
Step 403: the transport layer module of legacy server is returned ACK message to the transport layer module of client, confirms to break off;
Step 404: the transport layer module of legacy server is sent FIN message to the transport layer module of client, requires to break off the connection that is made progress to client-side by legacy server in the original Socket connection;
Step 405: the transport layer module of client is returned ACK message to the transport layer module of legacy server, confirms to break off.
After the 4-Way Handshake, the Socket connection between the transport layer module of client and the transport layer module of legacy server is disconnected; Afterwards, carry out three-way handshake between the transport layer module of the transport layer module of client and new server, set up new Socket and connect, specifically comprise step 406～step 408.
Step 406: the transport layer module of client is sent SYN message to the transport layer module of new server, and request is set up new Socket and connected;
Step 407: the transport layer module of new server is returned SYN ACK message to the transport layer module of client, confirms to set up;
Step 408: the transport layer module of client is returned ACK message to the transport layer module of new server again, reaffirms.So far accomplish three-way handshake, set up new Socket between the transport layer module of the transport layer module of client and new server and connected.
Below in conjunction with the life cycle of server, client, to create Socket and switching in the overall process of Socket connection, the handoff procedure that embodiment of the invention Socket is connected describes in detail.Referring to Fig. 5, the realization flow figure that Fig. 5 switches for embodiment of the invention Socket.Wherein, the step in the square frame 1 is that legacy server and client are set up the process that Socket switches; Step in the square frame 2 is that new server is created a new Socket, and the wait client is set up the process that Socket switches with new server; Step in the square frame 3 is that Socket connects the process of switching.Specifically describe as follows:
In the square frame 1, detailed process is:
Step 511: the application layer module of legacy server requires transport layer module to create a Socket through the Socket interface message of socket, binding (bind), monitoring standards such as (listen), and the wait client-requested is sent and set up the Socket connection requests.
Step 512: the application layer module of client is passed through socket and is connected (connect) message, requires transport layer module to create a Socket and set up Socket with legacy server and is connected.
Step 513: the transport layer module of client and the transport layer module of legacy server are set up old Socket and are connected through three-way handshake process; The application layer module of legacy server is called acceptance (accept) interface message, show Socket connect set up success after, legacy server is waited for the data that receive from client.
In the square frame 2, detailed process is:
Step 521: the application layer module of new server requires transport layer module to create a Socket through the Socket interface message of standards such as socket, bind, listen, and the wait client-requested is sent and set up the Socket connection requests.
Step 522: do not set up the Socket connection requests owing to also have client to send to new server before switching, the monitor process of new server is blocked (blocking) in the invoked procedure of accept interface message.
In the square frame 3, detailed process is:
Step 531: the application layer module of new server is sent switching command through setsockopt interface message or ioctl interface message to transport layer module.
Step 532: the transport layer module of new server generates switch request message according to this switching command, carries the address and the listening port information of the new server that transport layer module preserves in advance in this switch request message; The transport layer module of new server triggers the transport layer module of this switch request information and sending to legacy server legacy server and starts handoff procedure.
Step 533: the transport layer module of legacy server is sent switchstart message to the transport layer module of client; Carry the address and the listening port information of new server in this switch start message; Start the Socket handoff procedure, no longer allow the application layer module transceive data simultaneously; In addition, the transport layer module of legacy server is returned to the transport layer module of new server and answer to be confirmed (reply ok) message, as the feedback to the switch request message that receives.
Step 534: the transport layer module of client receives switch start message; Temporarily stop to send data for the application layer module of client; Application layer module is used to send the write operation of data, i.e. send operation is hung up (blocking under the blocking pattern) or is returned failure (under the unblock pattern); Because in the prior art; Application layer module often need wait for that also transport layer module is that it sends data; Operate the situation of being hung up or be returned failure and send occurs; Therefore, application layer module can't perceive transport layer module at this moment and carry out the Socket handoff procedure, and can think to send the normal condition that occurs in the data procedures.
Step 535: the transport layer module of client and the transport layer module of legacy server are broken off old Socket and are connected through the 4-Way Handshake process.
Step 536: the transport layer module of client, is set up new Socket with the transport layer module of new server and is connected through three-way handshake process according to the address and the listening port information of the new server in the switch start message.So far, Socket switches completion, and (unblock) opened in the send operation of client application layer module again, and the transport layer module of client reverts to the application layer module of client again and sends data; The monitor process of new server is also opened again, can normally carry out transfer of data between client and the new server.
In the prior art, in server and client side's transport layer module, all exist to receive buffer area and send buffer area, wherein, receive buffer area and be used to receive data, these data are sent to application layer module from the transport layer module of Correspondent Node; Send buffer area and be used to receive data, these data are sent to the transport layer module of Correspondent Node from application layer module.In above-mentioned Socket handoff procedure, in order to guarantee reliability of data transmission, the reception buffer area and the transmission buffer area of legacy server and client are done specific processing, specific as follows:
Reception buffer area to legacy server: because legacy server is no longer for client provides service, so the data from client of preserving in the reception buffer area of legacy server can directly abandon, and the application layer module of legacy server stops reading of data.
Transmission buffer area to legacy server: in the handoff procedure; In order to guarantee that legacy server still can be for client provides service before new server is taken over legacy server, the data from application layer module that the transmission buffer area of legacy server is preserved must normally be sent to client; Because new server is about to take over legacy server, the application layer module of old friend's server stops to write data to sending buffer area.
Reception buffer area to client: in the handoff procedure, the reception buffer area of client is normal to be received from legacy server or new data in server, and application layer module normally reads.
Transmission buffer area to client: in the handoff procedure, be that client provides service owing to temporarily do not have server, the transmission buffer area of client temporarily stops to send data; In order to guarantee that sending buffer area can not overflow, send buffer area and suspend to application layer module writes data, switch the back that finishes and recover.
The embodiment of the invention also proposes the switched system that a kind of Socket connects, and this system comprises:
First server (legacy server), second server (new server) and client, wherein, first server comprises first transport layer module, and second server comprises second transport layer module, and client comprises client transmissions layer module;
First transport layer module can be used to receive the handoff request message from second server, and this handoff request message is carried the address and the listening port information of second server; According to this handoff request message, send switching beginning message to client transmissions layer module, switch address and listening port information that beginning message is carried second server;
Client transmissions layer module can be used for according to switching beginning message, break off with first transport layer module between Socket be connected; According to address and the listening port information of switching the second server in the beginning message, foundation is connected with Socket between second transport layer module.
Above-mentioned client transmissions layer module can also be used for: after receive switching beginning message, and break off with first transport layer module between Socket be connected before, suspend application layer module transmission data for client; Set up with second transport layer module between Socket be connected after, revert to the application layer module transmission data of client again.
The embodiment of the invention also proposes a kind of server, and this server comprises: first transport layer module, be used to receive handoff request message from second server, and this handoff request message is carried the address and the listening port information of second server; According to said handoff request message, send switching beginning message to client transmissions layer module, address and listening port information that this switching beginning message is carried second server.
The embodiment of the invention also proposes another kind of server, comprising: second application layer module and second transport layer module; Wherein,
Second application layer module is used for sending switching command to second transport layer module;
Second transport layer module is used for generating handoff request message according to said switching command, and said handoff request message is carried the address and the listening port information of the said server that second transport layer module preserves in advance; Also be used for said handoff request message is sent to the transport layer module of first server.
The embodiment of the invention also proposes a kind of client device, comprises client transmissions layer module, is used for receiving changing beginning message address and listening port information that this switching beginning message is carried second server; Break off with first transport layer module between Socket be connected; According to address and the listening port information of switching the second server in the beginning message, foundation is connected with Socket between second transport layer module.
Above-mentioned client transmissions layer module can also be used for: after receive switching beginning message, and break off with first transport layer module between Socket be connected before, suspend application layer module transmission data for client device; Set up with second transport layer module between Socket be connected after, revert to the application layer module transmission data of client device again.
To sum up visible; Technical scheme of the present invention receives the address and the listening port information handoff request message of carrying new server by the transport layer module of legacy server; Start Socket and connect and switch, generate the transport layer module of switching information and sending to the client of the address that comprises new server and listening port information; The Socket that the transport layer module of client is broken off between the transport layer module with legacy server is connected; The Socket that sets up between the transport layer module with new server according to the address of new server and listening port information is connected; Realized the transparent fully Socket of application layer module is connected handoff procedure; Whole handoff procedure does not need the participation of application layer module, has alleviated the burden of application layer.Among the present invention, handoff request message can be sent to the transport layer module of legacy server by the transport layer module of new server when new startup of server.Connect in the handoff procedure at Socket, failure is hung up or be returned to the Socket write operation of the application layer module of client, and the application layer module perception is less than handoff procedure.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (5)
1. the changing method that connects of a socket Socket is characterized in that said method comprises:
The transport layer module of first server receives the handoff request message from second server, and said handoff request message is carried the address and the listening port information of second server;
According to said handoff request message, the transport layer module of first server is sent to the transport layer module of client and is switched beginning message, and said switching begins address and the listening port information that message is carried second server;
The transport layer module of client receives after said switching begins message, suspends to the application layer module of client and sends data, and begin message according to said switching, and the Socket that breaks off between the transport layer module with first server is connected; Begin the address and the listening port information of the second server in the message according to said switching; The Socket that sets up between the transport layer module with second server is connected; And after the Socket between the transport layer module of setting up with second server is connected, revert to the application layer module transmission data of client again.
2. method according to claim 1 is characterized in that, the transport layer module of said first server further comprises before receiving handoff request message:
The application layer module of second server is sent switching command to the transport layer module of second server;
The transport layer module of second server generates handoff request message according to said switching command, and said handoff request message is carried the address and the listening port information of the second server that transport layer module preserves in advance;
The transport layer module of second server is sent to said handoff request message the transport layer module of first server.
3. the switched system that Socket connects is characterized in that said system comprises: first server, second server and client; Wherein, said first server comprises first transport layer module, and said second server comprises second transport layer module, and said client comprises client transmissions layer module;
Said first transport layer module is used to receive the handoff request message from second server, and said handoff request message is carried the address and the listening port information of second server; According to said handoff request message, send switching beginning message to client transmissions layer module, said switching begins address and the listening port information that message is carried second server;
Said client transmissions layer module after being used to receive said switching and beginning message, suspended to the application layer module of client and sent data, and begin message according to said switching, break off with said first transport layer module between Socket be connected; Begin the address and the listening port information of the second server in the message according to said switching; Set up with second transport layer module between Socket be connected; And after the Socket between the transport layer module of setting up with second server is connected, revert to the application layer module transmission data of client again.
4. a server is characterized in that, said server comprises: second application layer module and second transport layer module; Wherein,
Said second application layer module is used for sending switching command to second transport layer module;
Said second transport layer module is used for generating handoff request message according to said switching command, and said handoff request message is carried the address and the listening port information of the said server that second transport layer module preserves in advance; Also be used for said handoff request message is sent to the transport layer module of first server.
5. a client device is characterized in that, said client device comprises: client transmissions layer module;
Said client transmissions layer module is used for receiving and switches beginning message, and this switching begins address and the listening port information that message is carried second server; After being used to receive said switching and beginning message, suspend to the application layer module of client and send data, and begin message according to said switching, break off with first transport layer module between Socket be connected; Begin the address and the listening port information of the second server in the message according to said switching; Set up with second transport layer module between Socket be connected; And after the Socket between the transport layer module of setting up with second server is connected, revert to the application layer module transmission data of client again.
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| CN2009100858168A CN101572709B (en) | 2009-06-01 | 2009-06-01 | Switching method, system, server and client device of socket connection |
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| CN2009100858168A CN101572709B (en) | 2009-06-01 | 2009-06-01 | Switching method, system, server and client device of socket connection |
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| CN101572709B true CN101572709B (en) | 2012-07-04 |
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| CN103546500A (en) * | 2012-07-11 | 2014-01-29 | 中国银联股份有限公司 | Method and system for switching servers |
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| CN114035705B (en) * | 2021-11-05 | 2024-02-13 | 北京碧云数创科技有限公司 | Intelligent screen data processing method based on Socket message |
| CN115334139B (en) * | 2022-06-24 | 2023-12-26 | 百果园技术(新加坡)有限公司 | Communication connection control method and device |
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