micro/debug/log/log.go

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// Package log provides debug logging
package log
import (
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"encoding/json"
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"fmt"
"time"
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)
var (
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// Default buffer size if any
DefaultSize = 1024
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// DefaultLog logger
DefaultLog = NewLog()
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// Default formatter
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DefaultFormat = TextFormat
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)
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// Log is debug log interface for reading and writing logs
type Log interface {
// Read reads log entries from the logger
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Read(...ReadOption) ([]Record, error)
// Write writes records to log
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Write(Record) error
// Stream log records
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Stream() (Stream, error)
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}
// Record is log record entry
type Record struct {
// Timestamp of logged event
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Timestamp time.Time `json:"timestamp"`
// Metadata to enrich log record
Metadata map[string]string `json:"metadata"`
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// Value contains log entry
Message interface{} `json:"message"`
}
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// Stream returns a log stream
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type Stream interface {
Chan() <-chan Record
Stop() error
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}
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// Format is a function which formats the output
type FormatFunc func(Record) string
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// TextFormat returns text format
func TextFormat(r Record) string {
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t := r.Timestamp.Format("2006-01-02 15:04:05")
return fmt.Sprintf("%s %v", t, r.Message)
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}
// JSONFormat is a json Format func
func JSONFormat(r Record) string {
b, _ := json.Marshal(r)
return string(b)
}