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logging: log to file

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New env var CTOP_DEBUG_FILE to specify a path to log file
This commit is contained in:
Sergey Ponomarev 2020-11-19 20:11:46 +02:00
parent 29d90cfdd9
commit e34afceb5f
4 changed files with 41 additions and 4 deletions
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3
.gitignore vendored
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@ -1,3 +1,4 @@
ctop
.idea
/vendor/
/vendor/
*.log

15
_docs/debug.md
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@ -54,3 +54,18 @@ CTOP_DEBUG=1 CTOP_DEBUG_TCP=1 ./ctop
```
A TCP listener for streaming log messages will be started on the default listen address(`0.0.0.0:9000`)
## Log to file
You can also log to a file by specifying `CTOP_DEBUG_FILE=/path/to/ctop.log` environment variable:
```sh
CTOP_DEBUG=1 CTOP_DEBUG_FILE=ctop.log ./ctop
```
This is useful for GoLand to see logs right in debug panel:
* Edit Run configuration
* Go to Logs tab
* Specify this log file in "Log file to be shown in console".
Then during debugging you'll see the log tab in debug panel:
![Debug in GoLand](img/goland_debug.png)

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27
logging/main.go
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@ -29,6 +29,7 @@ type statusMsg struct {
type CTopLogger struct {
*logging.Logger
backend *logging.MemoryBackend
logFile *os.File
sLog []statusMsg
}
@ -58,6 +59,7 @@ func Init() *CTopLogger {
Log = &CTopLogger{
logging.MustGetLogger("ctop"),
logging.NewMemoryBackend(size),
nil,
[]statusMsg{},
}
@ -68,7 +70,22 @@ func Init() *CTopLogger {
backendLvl := logging.AddModuleLevel(Log.backend)
backendLvl.SetLevel(level, "")
logging.SetBackend(backendLvl)
logFilePath := debugModeFile()
if logFilePath == "" {
logging.SetBackend(backendLvl)
} else {
logFile, err := os.OpenFile(logFilePath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0666)
if err != nil {
logging.SetBackend(backendLvl)
Log.Error("Unable to create log file: %s", err.Error())
} else {
backendFile := logging.NewLogBackend(logFile, "", 0)
backendFileLvl := logging.AddModuleLevel(backendFile)
backendFileLvl.SetLevel(level, "")
logging.SetBackend(backendLvl, backendFileLvl)
Log.logFile = logFile
}
}
if debugMode {
StartServer()
@ -105,8 +122,12 @@ func (log *CTopLogger) tail() chan string {
func (log *CTopLogger) Exit() {
exited = true
if log.logFile != nil {
_ = log.logFile.Close()
}
StopServer()
}
func debugMode() bool { return os.Getenv("CTOP_DEBUG") == "1" }
func debugModeTCP() bool { return os.Getenv("CTOP_DEBUG_TCP") == "1" }
func debugMode() bool { return os.Getenv("CTOP_DEBUG") == "1" }
func debugModeTCP() bool { return os.Getenv("CTOP_DEBUG_TCP") == "1" }
func debugModeFile() string { return os.Getenv("CTOP_DEBUG_FILE") }