48 lines
1.3 KiB
Go
48 lines
1.3 KiB
Go
package analytics
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import (
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"log"
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"os"
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)
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// Instances of types implementing this interface can be used to define where
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// the analytics client logs are written.
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type Logger interface {
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// Analytics clients call this method to log regular messages about the
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// operations they perform.
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// Messages logged by this method are usually tagged with an `INFO` log
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// level in common logging libraries.
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Logf(format string, args ...interface{})
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// Analytics clients call this method to log errors they encounter while
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// sending events to the backend servers.
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// Messages logged by this method are usually tagged with an `ERROR` log
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// level in common logging libraries.
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Errorf(format string, args ...interface{})
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}
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// This function instantiate an object that statisfies the analytics.Logger
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// interface and send logs to standard logger passed as argument.
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func StdLogger(logger *log.Logger) Logger {
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return stdLogger{
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logger: logger,
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}
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}
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type stdLogger struct {
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logger *log.Logger
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}
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func (l stdLogger) Logf(format string, args ...interface{}) {
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l.logger.Printf("INFO: "+format, args...)
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}
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func (l stdLogger) Errorf(format string, args ...interface{}) {
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l.logger.Printf("ERROR: "+format, args...)
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}
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func newDefaultLogger() Logger {
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return StdLogger(log.New(os.Stderr, "segment ", log.LstdFlags))
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}
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