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logger.go
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logger.go
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// Package logger implements a logging interface used to log messages.
package micrologger
import (
"context"
"encoding/json"
"fmt"
"io"
"log"
"github.com/giantswarm/microerror"
kitlog "github.com/go-kit/log"
"github.com/go-logr/logr"
"github.com/giantswarm/micrologger/loggermeta"
)
type Config struct {
Caller kitlog.Valuer
IOWriter io.Writer
TimestampFormatter kitlog.Valuer
}
type MicroLogger struct {
info logr.RuntimeInfo
logger kitlog.Logger
verbosity int
names []string
}
func New(config Config) (*MicroLogger, error) {
if config.Caller == nil {
config.Caller = DefaultCaller
}
if config.TimestampFormatter == nil {
config.TimestampFormatter = DefaultTimestampFormatter
}
if config.IOWriter == nil {
config.IOWriter = DefaultIOWriter
}
kitLogger := kitlog.NewJSONLogger(kitlog.NewSyncWriter(config.IOWriter))
kitLogger = kitlog.With(
kitLogger,
"caller", config.Caller,
"time", config.TimestampFormatter,
)
l := &MicroLogger{
logger: kitLogger,
}
return l, nil
}
func (l *MicroLogger) Debug(ctx context.Context, message string) {
kvs := []interface{}{
"level", "debug",
"message", message,
}
l.log(keyValsWithMeta(ctx, kvs))
}
func (l *MicroLogger) Debugf(ctx context.Context, format string, params ...interface{}) {
l.Debug(ctx, fmt.Sprintf(format, params...))
}
func (l *MicroLogger) Error(ctx context.Context, err error, message string) {
var kvs []interface{}
if err != nil {
kvs = []interface{}{
"level", "error",
"message", message,
"stack", microerror.JSON(err),
}
} else {
kvs = []interface{}{
"level", "error",
"message", message,
}
}
l.log(keyValsWithMeta(ctx, kvs))
}
func (l *MicroLogger) Errorf(ctx context.Context, err error, format string, params ...interface{}) {
l.Error(ctx, err, fmt.Sprintf(format, params...))
}
func (l *MicroLogger) Log(keyVals ...interface{}) {
l.log(processStack(keyVals))
}
func (l *MicroLogger) LogCtx(ctx context.Context, keyVals ...interface{}) {
l.log(keyValsWithMeta(ctx, keyVals))
}
func (l *MicroLogger) deepCopy() *MicroLogger {
return &MicroLogger{
info: l.info,
logger: l.logger,
verbosity: l.verbosity,
names: l.names[:],
}
}
func (l *MicroLogger) With(keyVals ...interface{}) Logger {
loggerCopy := l.deepCopy()
loggerCopy.logger = kitlog.With(loggerCopy.logger, keyVals...)
return loggerCopy
}
func (l *MicroLogger) log(keyVals []interface{}) {
err := l.logger.Log(keyVals...)
if err != nil {
log.Printf("failed to log with error: %#q, keyVals = %v", err.Error(), keyVals)
}
}
func keyValsWithMeta(ctx context.Context, keyVals []interface{}) []interface{} {
keyVals = processStack(keyVals)
meta, ok := loggermeta.FromContext(ctx)
if !ok {
return keyVals
}
var kvs []interface{}
{
kvs = append(kvs, keyVals...)
for k, v := range meta.KeyVals {
kvs = append(kvs, k)
kvs = append(kvs, v)
}
}
return kvs
}
func (l *MicroLogger) WithIncreasedCallerDepth() Logger {
return &MicroLogger{
logger: kitlog.With(l.logger, "caller", newCallerFunc(1)),
}
}
func processStack(keyVals []interface{}) []interface{} {
for i := 1; i < len(keyVals); i += 2 {
k := keyVals[i-1]
v := keyVals[i]
// If this is not the "stack" key try on next iteration.
if k != "stack" {
continue
}
// Try to get bytes of the data for the "stack" key. Return
// what is given otherwise.
var bytes []byte
switch data := v.(type) {
case string:
bytes = []byte(data)
case []byte:
bytes = data
default:
return keyVals
}
// If the found value isn't a JSON return.
var m map[string]interface{}
err := json.Unmarshal(bytes, &m)
if err != nil {
return keyVals
}
// If the found value is a JSON then make a copy of keyVals to
// not mutate the original one and store the value as a map to
// be rendered as a JSON object. Then return it.
keyValsCopy := append([]interface{}{}, keyVals...)
keyValsCopy[i] = m
return keyValsCopy
}
return keyVals
}
func (l *MicroLogger) AsSink(verbosity int) logr.LogSink {
loggerCopy := l.deepCopy()
loggerCopy.verbosity = verbosity
return &LogrSink{
MicroLogger: loggerCopy,
}
}