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Commit2863913

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chore: add http/pprof server over unix socket for debug (#295)
* chore: add http/pprof server over unix socket for debugSigned-off-by: Spike Curtis <spike@coder.com>* remove old pprof file without checking if it existsSigned-off-by: Spike Curtis <spike@coder.com>---------Signed-off-by: Spike Curtis <spike@coder.com>
1 parentf4d4fc1 commit2863913

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3 files changed

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‎main.go

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@@ -11,6 +11,7 @@ import (
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//go:generate go run github.com/hashicorp/terraform-plugin-docs/cmd/tfplugindocs
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funcmain() {
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servePprof()
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plugin.Serve(&plugin.ServeOpts{
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ProviderFunc:provider.New,
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})

‎pprof_unix.go

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//go:build !windows
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package main
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import (
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"net"
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"net/http"
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"net/http/pprof"
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"os"
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)
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// servePprof starts an HTTP server running the pprof goroutine handler on a local unix domain socket. As described in
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// https://github.com/coder/coder/issues/14726 it appears this process is sometimes hanging, unable to exit cleanly,
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// and this prevents additional Coder builds that try to reinstall this provider. A goroutine dump should allow us to
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// determine what is hanging.
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//
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// This function is best-effort, and just returns early if we fail to set up the directory/listener. We don't want to
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// block the normal functioning of the provider.
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funcservePprof() {
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// Coder runs terraform in a per-build subdirectory of the work directory. The per-build subdirectory uses a
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// generated name and is deleted at the end of a build, so we want to place our unix socket up one directory level
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// in the provisionerd work directory, so we can connect to it from provisionerd.
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err:=os.Mkdir("../.coder",0o700)
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iferr!=nil&&!os.IsExist(err) {
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return
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}
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// remove the old file, if it exists. It's probably from the last run of the provider
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iferr=os.Remove("../.coder/pprof");err!=nil&&!os.IsNotExist(err) {
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return
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}
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l,err:=net.Listen("unix","../.coder/pprof")
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iferr!=nil {
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return
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}
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mux:=http.NewServeMux()
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mux.Handle("/debug/pprof/goroutine",pprof.Handler("goroutine"))
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srv:= http.Server{Handler:mux}
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gosrv.Serve(l)
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// We just leave the server and domain socket up forever. Go programs exit when the `main()` function returns, so
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// this won't block exiting, and it ensures the pprof server stays up for the entire lifetime of the provider.
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}

‎pprof_windows.go

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//go:build windows
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package main
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// servePprof is not supported on Windows
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funcservePprof() {}

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