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Use loglevel to dynamically change logrus' log level during runtime (a…
…corn-io#752) (acorn-io#1861) Signed-off-by: Grant Linville <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| // Adapted from https://github.com/rancher/log/blob/52031d45f5fdb71cecb9a314865624b42514dbed/server/server.go | ||
| // The only real differences here are that we are using logrus directly instead of a wrapper around it, | ||
| // and that we are using an abstract namespace (non-file) socket. | ||
| // This is only compatible with our fork of the client: https://github.com/acorn-io/loglevel | ||
|
|
||
| package logserver | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net" | ||
| "net/http" | ||
| "os" | ||
|
|
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| "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| var ( | ||
| DefaultSocketLocation = "\x00logserver" | ||
| ) | ||
|
|
||
| // Server structure is used to the store backend information | ||
| type Server struct { | ||
| SocketLocation string | ||
| Debug bool | ||
| } | ||
|
|
||
| // StartServerWithDefaults starts the server with default values | ||
| func StartServerWithDefaults() { | ||
| logrus.SetLevel(logrus.InfoLevel) | ||
| s := Server{ | ||
| SocketLocation: DefaultSocketLocation, | ||
| } | ||
| s.Start() | ||
| } | ||
|
|
||
| // Start the server | ||
| func (s *Server) Start() { | ||
| _ = os.Remove(s.SocketLocation) | ||
| go func() { | ||
| _ = s.ListenAndServe() | ||
| }() | ||
| } | ||
|
|
||
| // ListenAndServe is used to setup handlers and | ||
| // start listening on the specified location | ||
| func (s *Server) ListenAndServe() error { | ||
| logrus.Infof("Listening on %s", s.SocketLocation) | ||
| server := http.Server{} | ||
| http.HandleFunc("/v1/loglevel", s.loglevel) | ||
| socketListener, err := net.Listen("unix", s.SocketLocation) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return server.Serve(socketListener) | ||
| } | ||
|
|
||
| func (s *Server) loglevel(rw http.ResponseWriter, req *http.Request) { | ||
| // curl -X POST -d "level=debug" localhost:12345/v1/loglevel | ||
| logrus.Debugf("Received loglevel request") | ||
| if req.Method == http.MethodGet { | ||
| level := logrus.GetLevel().String() | ||
| _, _ = rw.Write([]byte(fmt.Sprintf("%s\n", level))) | ||
| } | ||
|
|
||
| if req.Method == http.MethodPost { | ||
| if err := req.ParseForm(); err != nil { | ||
| rw.WriteHeader(http.StatusInternalServerError) | ||
| _, _ = rw.Write([]byte(fmt.Sprintf("Failed to parse form: %v\n", err))) | ||
| } | ||
| level, err := logrus.ParseLevel(req.Form.Get("level")) | ||
| if err != nil { | ||
| rw.WriteHeader(http.StatusInternalServerError) | ||
| _, _ = rw.Write([]byte(fmt.Sprintf("Failed to parse loglevel: %v\n", err))) | ||
| } else { | ||
| logrus.SetLevel(level) | ||
| _, _ = rw.Write([]byte("OK\n")) | ||
| } | ||
| } | ||
| } |