CN108650301A - The method based on android system for keeping UDP long connections - Google Patents
The method based on android system for keeping UDP long connections Download PDFInfo
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- CN108650301A CN108650301A CN201810341421.9A CN201810341421A CN108650301A CN 108650301 A CN108650301 A CN 108650301A CN 201810341421 A CN201810341421 A CN 201810341421A CN 108650301 A CN108650301 A CN 108650301A
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- udp
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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
- H04L67/143—Termination or inactivation of sessions, e.g. event-controlled end of session
- H04L67/145—Termination or inactivation of sessions, e.g. event-controlled end of session avoiding end of session, e.g. keep-alive, heartbeats, resumption message or wake-up for inactive or interrupted session
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/161—Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields
- H04L69/162—Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields involving adaptations of sockets based mechanisms
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/164—Adaptation or special uses of UDP protocol
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Health & Medical Sciences (AREA)
- Cardiology (AREA)
- General Health & Medical Sciences (AREA)
- Computer And Data Communications (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention discloses a kind of method based on android system keeping UDP long connections, is applied to server, the server is connect by data transmission network with terminal, and this method includes：APK of the customization suitable for terminal in advance, the APK include suspend mode notice process；APK does not hear readable event in preset time, then notifies the terminal to enter suspend mode to server transmission data packet from suspend mode notice process, while the terminal enters dormant state；After server receives the data packet of suspend mode notice process, interval preset time sends reversed heartbeat packet to the APK of terminal；APK receives the reversed heartbeat packet that server is sent, to maintain UDP links.The application, which is used, periodically to be sent to the ends APK server by way of reversed heartbeat packet and terminal periodically send heartbeat packet to server, to maintain UDP links, is not only not necessarily to expend a large amount of electricity and flow cost, but also is also ensured the reliability of UDP links.
Description
Technical field
The present invention relates to the communications field, especially one kind still capable of keeping UDP long after Android system enters deep-sleep
The method of connection.
Background technology
The overwhelming majority uses mobile terminal (palmtop computer, mobile phone, smart phone, mediaphone, portable media
Player, GPS unit, moving game system etc.) user, generally can all install from server receive notification message application,
Namely on server meeting PUSH message to mobile terminal.
When current terminal device is attached with server, generally transfer will be carried out by intermediate NAT device.Clothes
It when business device is communicated with terminal, needs to initially set up interface channel, if all needing to initially set up before each needs communicate
The interface channel, more expends the time.Therefore, the interface channel between server and terminal how is maintained when no data transmits
Just at problem to be solved.In the prior art, heartbeat packet is sent to the seeervice cycle to tie up generally by terminal device
Hold the interface channel.The disadvantages of this solution is：When terminal device is in deep power down mode, the timer of system is also stopped simultaneously
It sleeps, therefore does not just have the effect for maintaining network connection by the heartbeat packet of timer, can not accomplish real-time response.
Application terminal equipment has done a large amount of optimizations more than 6.0 version of Android, to electric power management mechanism, if terminal device
Under non-moving or charged state, system can then enter deep power down mode, and most APK softwares all can be because of this on the market
A pattern and information cannot be timely responded to, especially real-time intercommunication application is even more that can not use.
In addition, existing be generally multi-core CPU using the terminal of Android system, in order to make full use of multi-core CPU (be denoted as m cores,
Such as 4 core, 8 cores etc.), ideally, while there is the m progress of work work disposal is asked at the same time.Then in processing number
According to when, need initialization m to bind identical port, the UDP of identical IP address (SO_REUSEADDR, SO_REUSEPORT)
Next socket just reaches the load balancing of client requests by the lookup algorithm of kernel.Due to kernel lookup algorithm
It is fixed, then, virtually all client are divided into m classes：All client requests of Class1 are all routed to
The UDP socket of the progress of work 1 are handled by the progress of work 1, the request of the client of same-type 2 also all worked into
Journey 2 is handled, other and so on.It can be seen that existing Android system easily causes the short time in application UDP connections
Load it is extremely unbalanced.
Under normal circumstances, if a UDP packet can be identified for that a request, simple solution are each UDP
The progress of work n of socket n, voluntarily fork go out multiple subprocess to handle the request of the client of type n.In this way per height
The all direct recvfrom of process can, take UDP request bags and just handle, do not get just block.However, actually giving out a contract for a project
Cheng Zhong, an often request needs multiple UDP packets to identify, in such cases, when handling data, it is necessary to will be same
All UDP packets of client are all routed to the same work subprocess.At this time so that the extremely unbalanced feelings of the load of short time
Shape is more aggravated.
Invention content
Therefore, in view of the above-mentioned problems, the present invention proposes a kind of method based on android system keeping UDP long connections, make
It still can keep UDP long connections after Android system suspend mode, and will not expend a large amount of electricity or flow cost, to solve
The deficiency of the prior art.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is a kind of holding based on android system
The method of UDP long connections is applied to server, and the server is connect by data transmission network with terminal, and this method includes：
APK of the customization suitable for terminal in advance, the APK include master processes, fork processes and suspend mode notice process；
Master processes are used to monitor the readable event of UDP socket, when master processes listen to readable event, from what is had connected
Received data packet on socket；The data packet received is parsed, and judges whether the data packet comes from the UDP packets of new address,
If it is, fork process creations one new subprocess handles the UDP packets；If it is not, then being obtained by address mapping table
Corresponding original process handles the UDP packets；If master processes do not hear readable event in preset time, led to by suspend mode
Know that process notifies the terminal to enter suspend mode to server transmission data packet, while the terminal enters dormant state；
After server receives the data packet of suspend mode notice process, interval preset time sends the reversed heart to the APK of terminal
Jump packet；Wherein, the reversed heartbeat packet is user datagram protocol UDP data packet；
APK receives the reversed heartbeat packet that server is sent, to maintain UDP links.
Further, to ensure the reliability of UDP long connections, when the APK of terminal judges that it is in non-sleep state, eventually
The intervals the APK preset time at end sends heartbeat packet to maintain UDP links to server；Wherein, the heartbeat packet is user data
Datagram protocol UDP data packet.
In the prior art server in order to find out terminal whether suspend mode, need an additional process to carry out each terminal of poll,
To judge whether in a dormant state；The application is directed to terminal, actively sends what suspend mode notified to server using above-mentioned terminal
Scheme not only increases the connection strategy conversion speed of terminal and server, and does not hear readable event in preset time
When, so that terminal is entered dormant state automatically, compared to the existing scheme for needing manual depression of button and terminal being made to enter dormant state,
User experience is not only had more, but also is also greatly reduced the power consumption of terminal.In addition, bi-directionally sent by terminal and server
Heartbeat packet and reversed heartbeat packet ensure that no matter whether in a dormant state terminal, can guarantee the long connection of UDP.
Further, if master processes listen to readable event, the data received from the socket having connected
Whether packet comes from the UDP packets of new address, then be the new address creation by being inquired in work schedule worker_list
Corresponding worker subprocess；If do not found, which is handled by one new subprocess of fork process creations
Packet, and the information of the new address is recorded in worker_list.
After existing Android system enters deep-sleep, the timer of whole system is also all frozen, therefore allows APK suspend mode
It is infeasible to wake up system timer after when one section and send by way of UDP heartbeats keep the length connection of UDP links.It is existing
In technology, in such a way that prevention system enters suspend mode, UDP is allowed to be in long connection status, but such mode brings standby work(
Consumption problem, substantially reduce terminal uses duration.It is customized at some in deep type (such as：Huawei, OPPO, VIVO
Equal mobile phones), after standby a period of time, system will force to recycle these high power consumption applications.The application, which uses, passes through server
The mode that reversed heartbeat packet and terminal periodically send heartbeat packet to server periodically is sent toward the ends APK, to maintain UDP links,
It is not only not necessarily to expend a large amount of electricity and flow cost, but also also ensures the reliability of UDP links.Such mode can answer extensively
Application for there is real-time messages push-mechanism, such as instant message, real-time intercommunication application.
Specific implementation mode
The embodiment of the present invention is described below in detail, the embodiment is only used for explaining the present invention, and should not be understood as pair
The limitation of the present invention.
After existing Android system enters deep-sleep, the timer of whole system is also all frozen, therefore allows APK suspend mode
It is infeasible to wake up system timer after when one section and send by way of UDP heartbeats keep the length connection of UDP links.It is existing
In technology, in such a way that prevention system enters suspend mode, UDP is allowed to be in long connection status, but such mode brings standby work(
Consumption problem, substantially reduce mobile phone uses duration.It is customized at some in deep type (such as：Huawei, OPPO, VIVO
Equal mobile phones), after standby a period of time, system will force to recycle these high power consumption applications.The application is really above-mentioned in order to solve
Problem and propose.
Specifically, a kind of method of holding UDP long connections of the present invention, is applied to server, the server passes through number
It is connect with terminal according to transmission network, this method thinking is：When the multiple client request UDP message packets for being all type n arrive
When, the data packet routing issue of different type client gives kernel, at this point, establishing a master process to monitor UDP
The readable event of socket, master processes listen to readable event, just using MSG_PEEK options come recvfrom data packets,
If it find that be the UDP packets of new Endpoit (ip, port) Client, then with regard to fork mono- it is new carry out handle this
The request of Endpoit specifically includes following process：
Process 1：APK of the customization suitable for terminal in advance, which includes the readable event for monitoring UDP socket
Master processes, the fork processes for according to the snoop results of master processes create new subprocess and for server
Notice terminal enters the suspend mode notice process of suspend mode；
Master processes monitor the readable event of udp_socket_fd：Pfd.fd=udp_socket_fd；
Pfd.events=POLLIN；poll(pfd,1,-1)；
Process 2：If master processes listen to readable event, pfd.revents＆POLLIN true.Then detect one
The UDP packets of lower arrival whether be new client UDP packets:recvfrom(pfd.fd,buf,MAXSIZE,MSG_PEEK,
(struct sockaddr)pclientaddr,&addrlen)；Search whether worker_list is that the client is created
Cross worker subprocess.If do not found, fork processes are created that a new subprocess to handle the request, and will
The client information is recorded in worker_list.If found, return course 1；
In addition, each worker subprocess, preserves oneself client information pclientaddr to be treated.worker
Subprocess equally also monitors the readable event of udp_socket_fd.poll(pfd,1,-1)；When readable event arrive,
Pfd.revents＆POLLIN is true.Detect the UDP packets that arrive whether be this process client to be treated UDP
Packet:recvfrom(pfd.fd,buf,MAXSIZE,MSG_PEEK,(struct sockaddr)pclientaddr_2,&
addrlen)；It is whether consistent with pclientaddr_2 to compare pclientaddr；
Process 3：If master processes do not hear readable event in preset time, notify process to service from suspend mode
Device transmission data packet notifies the terminal to enter suspend mode, while the terminal enters dormant state；
Process 4：After server receives the data packet of suspend mode notice process, interval preset time is sent to the APK of terminal
Reversed heartbeat packet；Wherein, the reversed heartbeat packet is user datagram protocol UDP data packet；
Process 5：APK receives the reversed heartbeat packet that server is sent, to maintain UDP links.
To ensure the reliability of UDP long connections, when the APK of terminal judges that it is in non-sleep state, between the APK of terminal
Heartbeat packet is sent to maintain UDP links to server every preset time；Wherein, the heartbeat packet is user datagram protocol UDP
Data packet.
In the above process 2, when master processes listen to readable event, receive UDP packets, all worker into
Cheng Jun is waken up, and UDP packets can be taken out to handle by reacting most fast worker subprocess, while the data packet to arrive can only arrange
Team is removed.And more seriously, due to the exclusive wake-up of recvfrom, it is more likely that deadlock can be caused.Consider following one
A scene：Assuming that having worker1, worker2, worker3 and master, totally four processes are all blocked in poll calling,
A new UDP packet of client1 comes, this when, four processes can be waken up simultaneously, and worker1 compares speed, catches up with
UPD packets remove (worker1 can handle the UDP packets of client1) by other into Cheng Qian, then other three processes
Recvfrom fails to get or achieve what one wants, their worker2, worker3 and master are sequentially all blocked on recvfrom and sleep
(worker2, worker3 come first sleep before master).This when, the UDP packets packet4 of a new client4
It arrives, (due to the exclusive wake-up of recvfrom) only has worker2 that can wake up from the sleep of recvfrom this when, however
Worker and request UDP packets cannot be handled.If arrived without new UDP packets, packet4 is stayed in kernel always,
Deadlock.Why recv is exclusive, is in order to avoid the same data packet of multiple processes processing.Therefore, in order to avoid this
The occurrence of kind, each worker subprocess preserves oneself client information to be treated, and monitors readable event in real time；
After receiving data packet from the socket having connected, the data packet is parsed first, judges whether the data packet is marked
An independent request is known, if it is, control address mapping table obtains corresponding process to handle the data packet；If no
It is that then the data packet is stored in caching, continues to next data packet, and parse the data packet, judge whether to identify
The same request, repeats the process until the multiple data packets for identifying same request are received and finish, then by worker into
The pointer direction of journey is next, namely wakes up the next worker subprocess slept and handled.
By the above process, when terminal is in non-sleep state, the intervals the APK preset time of terminal is to server by the present invention
Heartbeat packet is sent to maintain UDP links, terminal in a dormant state when, server interval preset time is sent to the APK of terminal
Reversed heartbeat packet, therefore the reliable UDP long connections that ensure that into the Android system of deep-sleep.Just because of ensure that UDP
Long connection, (can not be after the front and continued of mark data so as to avoid connectionless property, the randomness compared to the UPD of TCP connection
After), and then the orderly processing of data packet and the improvement of worker subprocess are handled by master processes and fork processes
Mechanism, can also solve the common redundant transmission mechanism in UDP message packet randomness packet loss (is generally using more
The double hairs of delay, double hairs refer to that continuous two packets before and after script single-shot, which are merged into one big packet, to be sent, and sends in this way
Data volume is original twice), using the scheme of the application, without redundant transmission mechanism, you can ensure the biography of data packet
Defeated stability.
Although specifically showing and describing the present invention in conjunction with preferred embodiment, those skilled in the art should be bright
In vain, it is not departing from the spirit and scope of the present invention defined by the appended claims, it in the form and details can be right
The present invention makes a variety of changes, and is protection scope of the present invention.
Claims (7)
1. the method based on android system for keeping UDP long connections, is applied to server, the server passes through data transmission network
Network is connect with terminal, which is characterized in that this method includes：
APK of the customization suitable for terminal in advance, the APK include suspend mode notice process；APK does not hear readable thing in preset time
Part then notifies the terminal to enter suspend mode from suspend mode notice process to server transmission data packet, while the terminal enters suspend mode shape
State；
After server receives the data packet of suspend mode notice process, interval preset time sends reversed heartbeat packet to the APK of terminal；
APK receives the reversed heartbeat packet that server is sent, to maintain UDP links.
2. the method according to claim 1 for keeping UDP long connections, it is characterised in that：
When terminal is in non-sleep state, the intervals the APK preset time of terminal sends heartbeat packet to maintain UDP chains to server
Road.
3. the method according to claim 2 for keeping UDP long connections, it is characterised in that：The heartbeat packet is user data
Datagram protocol UDP data packet.
4. the method according to claim 1 or 2 for keeping UDP long connections, it is characterised in that：The reversed heartbeat packet is to use
User data datagram protocol UDP data packet.
5. the method according to claim 1 or 2 for keeping UDP long connections, it is characterised in that：The APK further includes
Master processes and fork processes；
Master processes are used to monitor the readable event of UDP socket, when master processes listen to readable event, from having connected
Received data packet on the socket connect；
Parse the data packet that receives, and judge whether the data packet comes from the UDP packets of new address, if it is, fork into
Journey creates a new subprocess to handle the UDP packets；If it is not, then obtaining corresponding former process by address mapping table to locate
Manage the UDP packets；
If master processes do not hear readable event in preset time, notify process to server transmission data from suspend mode
Packet notifies the terminal to enter suspend mode, while the terminal enters dormant state.
6. the method according to claim 5 for keeping UDP long connections, it is characterised in that：If master processes listen to
Readable event, the data packet received from the socket having connected comes from the UDP packets of new address, then by work schedule
The corresponding worker subprocess that whether has been the new address creation is inquired in worker_list；If do not found, by
To handle the UDP packets worker_list is recorded in the information of the new address by one new subprocess of fork process creations
In.
7. the method according to claim 6 for keeping UDP long connections, it is characterised in that：Each worker subprocess preserves
Oneself client information to be treated, and readable event is monitored in real time；
After receiving data packet from the socket having connected, the data packet is parsed first, judges that the data packet is
It is no to identify an independent request, if it is, control address mapping table obtains corresponding process to handle the data packet；
If it is not, then the data packet is stored in caching, next data packet is continued to, and parses the data packet, is sentenced
It is disconnected whether to identify the same request, it repeats the process and is finished up to multiple data packets of the same request of mark are received, then will
The pointer direction of worker subprocess is next, namely wakes up the next worker subprocess slept and handled.
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