Golang TCP Auto-re-connection

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Operating system: CentOS 6.9_x64

Go language version: 1.8.3

Problem description

There is a TCP client program that needs to fetch data from the server on a regular basis, but it needs to be automatically re-connected for a variety of reasons (network instability, etc.).

Test Server Sample code:

/*TCP Server for test e-mail:mike_zhang@live.com*/Package main Import ("FMT"    "Net"    "OS"    "Strings"    " Time") func checkerror (err error) {ifErr! =Nil {fmt. PRINTLN (ERR) OS. Exit (1)}}} func handleclient (conn net. Conn) {Conn. Setreaddeadline (time. Now (). ADD (3*Time . Minute)) Request:= Make ([]byte,1024x768) Defer Conn. Close () for{recv_len,err:=Conn. Read (Request)ifErr! =Nil {fmt. PRINTLN (ERR) Break } ifRecv_len = =0 {  Break} recvdata:= Strings. Trimspace (string(Request[:recv_len]) fmt. Println ("Recv_len:", Recv_len) fmt. Println ("Recv_data:"+recvdata) Daytime:=Time . Now (). String () Conn. Write ([]byte(Daytime +"\ n") Request= Make ([]byte,1024x768)}}} Func main () {bindinfo:=": 12345"Tcpaddr,err:= Net. RESOLVETCPADDR ("TCP4", Bindinfo) checkerror (err) Listener,err:= Net. LISTENTCP ("TCP", TCPADDR) checkerror (err) for{cc,err:=Listener. Accept ()ifErr! =Nil {Continue} go Handleclient (cc)}}

View Code

Solution Solutions

/*TCP client with reconnect e-mail:mike_zhang@live.com*/Package main Import ("Net"    "FMT"    "Bufio"    " Time") func dotask (conn net. Conn) { for{fmt. fprintf (Conn,"Test msg\n") Msg,err:= Bufio. Newreader (conn). ReadString ('\ n') ifErr! =Nil {fmt. Println ("recv Data Error")  Break }Else{fmt. Println ("recv msg:", MSG)} Time. Sleep (1*Time . Second)}}} Func main () {hostinfo:="127.0.0.1:12345"     for{conn,err:= Net. Dial ("TCP", Hostinfo) fmt. Print ("Connect (", Hostinfo)ifErr! =Nil {fmt. Println (") Fail") }Else{fmt. Println (") OK") Defer Conn. Close () Dotask (conn)} time. Sleep (3*Time . Second)}}

Operating effect:

[Root@local t1]#./tcpClient1 Connect (127.0.0.1:12345) OK recv msg: .- .- A  +:Ten:32.110977137+0800CST recv msg: .- .- A  +:Ten:33.111868746+0800CST recv Data error Connect (127.0.0.1:12345) fail Connect (127.0.0.1:12345) fail Connect (127.0.0.1:12345) OK recv msg: .- .- A  +:Ten:43.117203432+0800CST recv msg: .- .- A  +:Ten:44.11853427+0800Cst

Discuss

Here is a simple example code that implements TCP auto-re-interconnection.

All right, that's it, I hope it helps you.

This article GitHub address:

https://github.com/mike-zhang/mikeBlogEssays/blob/master/2017/20170613_golang TCP Auto-re-connect. RST

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