59 lines
1.6 KiB
Markdown
59 lines
1.6 KiB
Markdown
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## Features
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- packages use tagged logger sending log messages to shared (process-wide) logging engine
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- log writers (interface ethlog.LogSystem) can be added to the logging engine by wrappers/guis/clients
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- shared logging engine dispatching to multiple log systems
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- log level can be set separately per log system
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- async logging thread: logging IO does not block main thread
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- log messages are synchronously stringified to avoid incorrectly logging of changed states
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## Usage
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In an ethereum component package:
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import "github.com/ethereum/eth-go/ethlog"
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// package-wide logger using tag
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var logger = ethlog.NewLogger("TAG")
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logger.Infoln("this is info") # > [TAG] This is info
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Ethereum wrappers should register log systems conforming to ethlog.LogSystem
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import "github.com/ethereum/eth-go/ethlog"
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type CustomLogWriter struct {
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logLevel ethlog.LogLevel
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}
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func (t *TestLogSystem) SetLogLevel(i LogLevel) {
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t.level = i
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}
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func (t *TestLogSystem) GetLogLevel() LogLevel {
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return t.level
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}
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func (c *CustomLogWriter) Printf(format string, v...interface{}) {
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//....
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}
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func (c *CustomLogWriter) Println(v...interface{}) {
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//....
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}
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ethlog.AddLogWriter(&CustomLogWriter{})
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ethlog also provides constructors for that wrap io.Writers into a standard logger with a settable level:
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filename := "test.log"
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file, _ := os.OpenFile(filename, os.O_RDWR|os.O_CREATE, os.ModePerm)
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fileLogSystem := NewStdLogSystem(file, 0, WarnLevel)
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AddLogSystem(fileLogSystem)
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stdOutLogSystem := NewStdLogSystem(os.Stdout, 0, WarnLevel)
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AddLogSystem(stdOutLogSystem)
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