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vendor/github.com/a-h/gemini/log/log.go

@@ -0,0 +1,82 @@
+package log
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"sync"
+	"time"
+)
+
+type Field func() (k string, v interface{})
+
+func String(name string, value string) Field {
+	return func() (k string, v interface{}) {
+		return name, value
+	}
+}
+func Int(name string, value int) Field {
+	return func() (k string, v interface{}) {
+		return name, value
+	}
+}
+func Int64(name string, value int64) Field {
+	return func() (k string, v interface{}) {
+		return name, value
+	}
+}
+func Interface(name string, value interface{}) Field {
+	return func() (k string, v interface{}) {
+		return name, value
+	}
+}
+
+func Info(msg string, fields ...Field) {
+	std.Write("INFO", msg, fields...)
+}
+
+func Warn(msg string, fields ...Field) {
+	std.Write("WARN", msg, fields...)
+}
+
+func Error(msg string, err error, fields ...Field) {
+	if err != nil {
+		fields = append(fields, String("error", err.Error()))
+	}
+	std.Write("ERROR", msg, fields...)
+}
+
+type Logger struct {
+	stdout  sync.Mutex
+	stderr  sync.Mutex
+	enc     json.Encoder
+	newLine []byte
+}
+
+func (s *Logger) Write(level string, msg string, fields ...Field) {
+	entry := make(map[string]interface{})
+	entry["time"] = time.Now().UTC().Format(time.RFC3339)
+	entry["level"] = level
+	entry["msg"] = msg
+	for i := 0; i < len(fields); i++ {
+		k, v := fields[i]()
+		entry[k] = v
+	}
+	j, err := json.Marshal(entry)
+	if err != nil {
+		j = []byte(fmt.Sprintf("log.Write: failed to marshal entry '%+v': %v", entry, err))
+	}
+	if level == "ERROR" {
+		s.stderr.Lock()
+		defer s.stderr.Unlock()
+		os.Stderr.Write(j)
+		os.Stderr.Write(s.newLine)
+		return
+	}
+	s.stdout.Lock()
+	defer s.stdout.Unlock()
+	os.Stdout.Write(j)
+	os.Stderr.Write(s.newLine)
+}
+
+var std = &Logger{newLine: []byte("\n")}