Golang

In this gist, We will check how we can extract SPF records in Go. Prerequisite Go version $ go version go version go1.13 linux/amd64 Dependency DNS Library(https://github.com/miekg/dns) Install dependency $ go get github.com/miekg/dns spfLookup.go Here you can change nameserver according to your requirement. I have specified here google’s name server (8.8.8.8). You can also use cloudflare’s nameserver (1.1.1.1) Conclusion You can make any DNS query with miekg/dns library. In the above script, we have looked up TXT Records and then we have searched for a string containing v=spf1. ...

What this talk about? I am working on Golang for the last 1 year from the published date. I have shared some basics of Golang. Also, shared What are the pain points developers face when they migrate from any other language (Especially from web language like PHP) to Golang? I have explained the Webhook architecture of MimePost And how we sending 100k Request hourly( Though Benchmark proves we can scale up to 500k). ...

The Problem: Suddenly got below errors which killed my daemon: fatal error: concurrent map writes goroutine 646 [running]: runtime.throw(0x75fd38, 0x15) /usr/local/go/src/runtime/panic.go:774 +0x72 fp=0xc000315e60 sp=0xc000315e30 pc=0x42ecf2 runtime.mapdelete_fast64(0x6f0800, 0xc00008ad50, 0x2b3e) goroutine 1 [sleep]: runtime.goparkunlock(...) /usr/local/go/src/runtime/proc.go:310 time.Sleep(0x12a05f200) /usr/local/go/src/runtime/time.go:105 +0x157 webhook/worker.Manager() goroutine 6 [IO wait]: internal/poll.runtime_pollWait(0x7fc308de6f08, 0x72, 0x0) /usr/local/go/src/runtime/netpoll.go:184 +0x55 internal/poll.(*pollDesc).wait(0xc000110018, 0x72, 0x0, 0x0, 0x75b00b) /usr/local/go/src/internal/poll/fd_poll_runtime.go:87 +0x45 internal/poll.(*pollDesc).waitRead(...) /usr/local/go/src/internal/poll/fd_poll_runtime.go:92 internal/poll.(*FD).Accept(0xc000110000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0) /usr/local/go/src/internal/poll/fd_unix.go:384 +0x1f8 net.(*netFD).accept(0xc000110000, 0xc000050d50, 0xc000046700, 0x7fc308e426d0) /usr/local/go/src/net/fd_unix.go:238 +0x42 net.(*TCPListener).accept(0xc000126000, 0xc000050d80, 0x40dd08, 0x30) /usr/local/go/src/net/tcpsock_posix.go:139 +0x32 net.(*TCPListener).Accept(0xc000126000, 0x72f560, 0xc0000f0180, 0x6f4f20, 0x9c00c0) /usr/local/go/src/net/tcpsock.go:261 +0x47 net/http.(*Server).Serve(0xc0000f4000, 0x7ccbe0, 0xc000126000, 0x0, 0x0) /usr/local/go/src/net/http/server.go:2896 +0x286 net/http.(*Server).ListenAndServe(0xc0000f4000, 0xc0000f4000, 0x8) /usr/local/go/src/net/http/server.go:2825 +0xb7 net/http.ListenAndServe(...) /usr/local/go/src/net/http/server.go:3080 webhook/handler.HandleRequest() Expected behaviour In starting for a few seconds it was working smoothly. ...