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143 lines
3.2 KiB
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143 lines
3.2 KiB
Plaintext
---
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sidebar_position: 3
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---
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# Log
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The Wails runtime provides a logging mechanism that may be called from Go or JavaScript. Like most
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loggers, there are a number of log levels:
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- Trace
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- Debug
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- Info
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- Warning
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- Error
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- Fatal
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The logger will output any log message at the current, or higher, log level. Example: The `Debug` log
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level will output all messages except `Trace` messages.
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### LogPrint
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Logs the given message as a raw message.
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Go: `LogPrint(ctx context.Context, message string)`<br/>
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JS: `LogPrint(message: string)`
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### LogPrintf
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Logs the given message as a raw message.
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Go: `LogPrintf(ctx context.Context, format string, args ...interface{})`<br/>
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### LogTrace
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Logs the given message at the `Trace` log level.
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Go: `LogTrace(ctx context.Context, message string)`<br/>
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JS: `LogTrace(message: string)`
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### LogTracef
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Logs the given message at the `Trace` log level.
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Go: `LogTracef(ctx context.Context, format string, args ...interface{})`<br/>
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### LogDebug
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Logs the given message at the `Debug` log level.
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Go: `LogDebug(ctx context.Context, message string)`<br/>
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JS: `LogDebug(message: string)`
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### LogDebugf
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Logs the given message at the `Debug` log level.
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Go: `LogDebugf(ctx context.Context, format string, args ...interface{})`<br/>
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### LogInfo
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Logs the given message at the `Info` log level.
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Go: `LogInfo(ctx context.Context, message string)`<br/>
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JS: `LogInfo(message: string)`
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### LogInfof
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Logs the given message at the `Info` log level.
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Go: `LogInfof(ctx context.Context, format string, args ...interface{})`<br/>
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### LogWarning
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Logs the given message at the `Warning` log level.
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Go: `LogWarning(ctx context.Context, message string)`<br/>
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JS: `LogWarning(message: string)`
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### LogWarningf
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Logs the given message at the `Warning` log level.
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Go: `LogWarningf(ctx context.Context, format string, args ...interface{})`<br/>
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### LogError
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Logs the given message at the `Error` log level.
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Go: `LogError(ctx context.Context, message string)`<br/>
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JS: `LogError(message: string)`
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### LogErrorf
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Logs the given message at the `Error` log level.
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Go: `LogErrorf(ctx context.Context, format string, args ...interface{})`<br/>
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### LogFatal
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Logs the given message at the `Fatal` log level.
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Go: `LogFatal(ctx context.Context, message string)`<br/>
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JS: `LogFatal(message: string)`
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### LogFatalf
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Logs the given message at the `Fatal` log level.
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Go: `LogFatalf(ctx context.Context, format string, args ...interface{})`<br/>
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### LogSetLogLevel
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Sets the log level. In JavaScript, the number relates to the following log levels:
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| Value | Log Level |
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| ----- | --------- |
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| 1 | Trace |
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| 2 | Debug |
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| 3 | Info |
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| 4 | Warning |
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| 5 | Error |
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Go: `LogSetLogLevel(ctx context.Context, level logger.LogLevel)`<br/>
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JS: `LogSetLogLevel(level: number)`
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## Using a Custom Logger
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A custom logger may be used by providing it using the [Logger](../options.mdx#logger)
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application option. The only requirement is that the logger implements the `logger.Logger` interface
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defined in `github.com/wailsapp/wails/v2/pkg/logger`:
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```go title="logger.go"
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type Logger interface {
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Print(message string)
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Trace(message string)
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Debug(message string)
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Info(message string)
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Warning(message string)
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Error(message string)
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Fatal(message string)
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}
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```
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