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Merge pull request #143 from wneessen/feature/142_implement-structured-json-logger
#142 Add structured JSON logger and associated tests
This commit is contained in:
GitHub
commit
8f3e5d382c
3 changed files with 406 additions and 0 deletions
82
log/jsonlog.go
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82
log/jsonlog.go
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@ -0,0 +1,82 @@
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// SPDX-FileCopyrightText: Copyright (c) 2023 The go-mail Authors
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//
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// SPDX-License-Identifier: MIT
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//go:build go1.21
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// +build go1.21
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package log
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import (
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"fmt"
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"io"
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"log/slog"
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)
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// JSONlog is the default structured JSON logger that satisfies the Logger interface
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type JSONlog struct {
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l Level
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log *slog.Logger
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}
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// NewJSON returns a new JSONlog type that satisfies the Logger interface
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func NewJSON(o io.Writer, l Level) *JSONlog {
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lo := slog.HandlerOptions{}
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switch l {
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case LevelDebug:
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lo.Level = slog.LevelDebug
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case LevelInfo:
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lo.Level = slog.LevelInfo
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case LevelWarn:
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lo.Level = slog.LevelWarn
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case LevelError:
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lo.Level = slog.LevelError
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default:
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lo.Level = slog.LevelDebug
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}
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lh := slog.NewJSONHandler(o, &lo)
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return &JSONlog{
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l: l,
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log: slog.New(lh),
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}
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}
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// Debugf logs a debug message via the structured JSON logger
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func (l *JSONlog) Debugf(lo Log) {
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if l.l >= LevelDebug {
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l.log.WithGroup(DirString).With(
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slog.String(DirFromString, lo.directionFrom()),
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slog.String(DirToString, lo.directionTo()),
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).Debug(fmt.Sprintf(lo.Format, lo.Messages...))
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}
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}
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// Infof logs a info message via the structured JSON logger
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func (l *JSONlog) Infof(lo Log) {
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if l.l >= LevelInfo {
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l.log.WithGroup(DirString).With(
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slog.String(DirFromString, lo.directionFrom()),
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slog.String(DirToString, lo.directionTo()),
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).Info(fmt.Sprintf(lo.Format, lo.Messages...))
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}
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}
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// Warnf logs a warn message via the structured JSON logger
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func (l *JSONlog) Warnf(lo Log) {
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if l.l >= LevelWarn {
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l.log.WithGroup(DirString).With(
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slog.String(DirFromString, lo.directionFrom()),
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slog.String(DirToString, lo.directionTo()),
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).Warn(fmt.Sprintf(lo.Format, lo.Messages...))
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}
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}
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// Errorf logs a warn message via the structured JSON logger
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func (l *JSONlog) Errorf(lo Log) {
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if l.l >= LevelError {
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l.log.WithGroup(DirString).With(
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slog.String(DirFromString, lo.directionFrom()),
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slog.String(DirToString, lo.directionTo()),
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).Error(fmt.Sprintf(lo.Format, lo.Messages...))
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}
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}
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297
log/jsonlog_test.go
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297
log/jsonlog_test.go
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@ -0,0 +1,297 @@
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// SPDX-FileCopyrightText: Copyright (c) 2023 The go-mail Authors
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//
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// SPDX-License-Identifier: MIT
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//go:build go1.21
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// +build go1.21
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package log
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"testing"
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"time"
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)
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type jsonLog struct {
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Direction jsonDir `json:"direction"`
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Level string `json:"level"`
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Message string `json:"msg"`
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Time time.Time `json:"time"`
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}
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type jsonDir struct {
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From string `json:"from"`
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To string `json:"to"`
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}
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func TestNewJSON(t *testing.T) {
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var b bytes.Buffer
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l := NewJSON(&b, LevelDebug)
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if l.l != LevelDebug {
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t.Error("Expected level to be LevelDebug, got ", l.l)
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}
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if l.log == nil {
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t.Error("logger not initialized")
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}
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}
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func TestJSONDebugf(t *testing.T) {
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var b bytes.Buffer
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l := NewJSON(&b, LevelDebug)
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f := "test %s"
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msg := "foo"
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msg2 := "bar"
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l.Debugf(Log{Direction: DirServerToClient, Format: f, Messages: []interface{}{msg}})
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exFrom := "server"
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exTo := "client"
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jl, err := unmarshalLog(b.Bytes())
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if err != nil {
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t.Errorf("Debugf() failed, unmarshal json log message failed: %s", err)
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}
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if jl.Direction.To != exTo {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exTo, jl.Direction.To)
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}
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if jl.Direction.From != exFrom {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exFrom, jl.Direction.From)
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}
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if jl.Message != fmt.Sprintf(f, msg) {
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t.Errorf("Debugf() failed, expected message: %s, got %s", msg, jl.Message)
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}
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b.Reset()
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l.Debugf(Log{Direction: DirClientToServer, Format: f, Messages: []interface{}{msg2}})
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exFrom = "client"
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exTo = "server"
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jl, err = unmarshalLog(b.Bytes())
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if err != nil {
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t.Errorf("Debugf() failed, unmarshal json log message failed: %s", err)
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}
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if jl.Direction.To != exTo {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exTo, jl.Direction.To)
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}
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if jl.Direction.From != exFrom {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exFrom, jl.Direction.From)
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}
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if jl.Message != fmt.Sprintf(f, msg2) {
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t.Errorf("Debugf() failed, expected message: %s, got %s", msg2, jl.Message)
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}
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b.Reset()
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l.l = LevelInfo
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l.Debugf(Log{Direction: DirServerToClient, Format: "test %s", Messages: []interface{}{"foo"}})
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if b.String() != "" {
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t.Error("Debug message was not expected to be logged")
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}
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}
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func TestJSONDebugf_WithDefault(t *testing.T) {
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var b bytes.Buffer
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l := NewJSON(&b, 999)
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f := "test %s"
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msg := "foo"
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msg2 := "bar"
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l.Debugf(Log{Direction: DirServerToClient, Format: f, Messages: []interface{}{msg}})
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exFrom := "server"
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exTo := "client"
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jl, err := unmarshalLog(b.Bytes())
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if err != nil {
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t.Errorf("Debugf() failed, unmarshal json log message failed: %s", err)
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}
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if jl.Direction.To != exTo {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exTo, jl.Direction.To)
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}
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if jl.Direction.From != exFrom {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exFrom, jl.Direction.From)
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}
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if jl.Message != fmt.Sprintf(f, msg) {
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t.Errorf("Debugf() failed, expected message: %s, got %s", msg, jl.Message)
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}
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b.Reset()
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l.Debugf(Log{Direction: DirClientToServer, Format: f, Messages: []interface{}{msg2}})
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exFrom = "client"
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exTo = "server"
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jl, err = unmarshalLog(b.Bytes())
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if err != nil {
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t.Errorf("Debugf() failed, unmarshal json log message failed: %s", err)
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}
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if jl.Direction.To != exTo {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exTo, jl.Direction.To)
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}
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if jl.Direction.From != exFrom {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exFrom, jl.Direction.From)
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}
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if jl.Message != fmt.Sprintf(f, msg2) {
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t.Errorf("Debugf() failed, expected message: %s, got %s", msg2, jl.Message)
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}
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b.Reset()
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l.l = LevelInfo
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l.Debugf(Log{Direction: DirServerToClient, Format: "test %s", Messages: []interface{}{"foo"}})
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if b.String() != "" {
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t.Error("Debug message was not expected to be logged")
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}
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}
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func TestJSONInfof(t *testing.T) {
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var b bytes.Buffer
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l := NewJSON(&b, LevelInfo)
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f := "test %s"
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msg := "foo"
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msg2 := "bar"
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l.Infof(Log{Direction: DirServerToClient, Format: f, Messages: []interface{}{msg}})
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exFrom := "server"
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exTo := "client"
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jl, err := unmarshalLog(b.Bytes())
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if err != nil {
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t.Errorf("Debugf() failed, unmarshal json log message failed: %s", err)
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}
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if jl.Direction.To != exTo {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exTo, jl.Direction.To)
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}
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if jl.Direction.From != exFrom {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exFrom, jl.Direction.From)
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}
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if jl.Message != fmt.Sprintf(f, msg) {
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t.Errorf("Debugf() failed, expected message: %s, got %s", msg, jl.Message)
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}
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b.Reset()
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l.Infof(Log{Direction: DirClientToServer, Format: f, Messages: []interface{}{msg2}})
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exFrom = "client"
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exTo = "server"
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jl, err = unmarshalLog(b.Bytes())
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if err != nil {
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t.Errorf("Debugf() failed, unmarshal json log message failed: %s", err)
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}
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if jl.Direction.To != exTo {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exTo, jl.Direction.To)
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}
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if jl.Direction.From != exFrom {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exFrom, jl.Direction.From)
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}
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if jl.Message != fmt.Sprintf(f, msg2) {
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t.Errorf("Debugf() failed, expected message: %s, got %s", msg2, jl.Message)
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}
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b.Reset()
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l.l = LevelWarn
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l.Infof(Log{Direction: DirServerToClient, Format: "test %s", Messages: []interface{}{"foo"}})
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if b.String() != "" {
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t.Error("Info message was not expected to be logged")
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}
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}
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func TestJSONWarnf(t *testing.T) {
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var b bytes.Buffer
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l := NewJSON(&b, LevelWarn)
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f := "test %s"
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msg := "foo"
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msg2 := "bar"
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l.Warnf(Log{Direction: DirServerToClient, Format: f, Messages: []interface{}{msg}})
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exFrom := "server"
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exTo := "client"
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jl, err := unmarshalLog(b.Bytes())
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if err != nil {
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t.Errorf("Debugf() failed, unmarshal json log message failed: %s", err)
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}
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if jl.Direction.To != exTo {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exTo, jl.Direction.To)
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}
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if jl.Direction.From != exFrom {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exFrom, jl.Direction.From)
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}
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if jl.Message != fmt.Sprintf(f, msg) {
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t.Errorf("Debugf() failed, expected message: %s, got %s", msg, jl.Message)
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}
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b.Reset()
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l.Warnf(Log{Direction: DirClientToServer, Format: f, Messages: []interface{}{msg2}})
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exFrom = "client"
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exTo = "server"
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jl, err = unmarshalLog(b.Bytes())
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if err != nil {
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t.Errorf("Debugf() failed, unmarshal json log message failed: %s", err)
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}
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if jl.Direction.To != exTo {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exTo, jl.Direction.To)
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}
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if jl.Direction.From != exFrom {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exFrom, jl.Direction.From)
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}
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if jl.Message != fmt.Sprintf(f, msg2) {
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t.Errorf("Debugf() failed, expected message: %s, got %s", msg2, jl.Message)
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}
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b.Reset()
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l.l = LevelError
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l.Warnf(Log{Direction: DirServerToClient, Format: "test %s", Messages: []interface{}{"foo"}})
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if b.String() != "" {
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t.Error("Warn message was not expected to be logged")
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}
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}
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func TestJSONErrorf(t *testing.T) {
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var b bytes.Buffer
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l := NewJSON(&b, LevelError)
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f := "test %s"
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msg := "foo"
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msg2 := "bar"
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l.Errorf(Log{Direction: DirServerToClient, Format: f, Messages: []interface{}{msg}})
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exFrom := "server"
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exTo := "client"
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jl, err := unmarshalLog(b.Bytes())
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if err != nil {
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t.Errorf("Debugf() failed, unmarshal json log message failed: %s", err)
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}
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if jl.Direction.To != exTo {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exTo, jl.Direction.To)
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}
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if jl.Direction.From != exFrom {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exFrom, jl.Direction.From)
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}
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if jl.Message != fmt.Sprintf(f, msg) {
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t.Errorf("Debugf() failed, expected message: %s, got %s", msg, jl.Message)
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}
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b.Reset()
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l.Errorf(Log{Direction: DirClientToServer, Format: f, Messages: []interface{}{msg2}})
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exFrom = "client"
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exTo = "server"
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jl, err = unmarshalLog(b.Bytes())
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if err != nil {
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t.Errorf("Debugf() failed, unmarshal json log message failed: %s", err)
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}
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if jl.Direction.To != exTo {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exTo, jl.Direction.To)
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}
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if jl.Direction.From != exFrom {
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t.Errorf("Debugf() failed, expected message to: %s, got: %s", exFrom, jl.Direction.From)
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}
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if jl.Message != fmt.Sprintf(f, msg2) {
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t.Errorf("Debugf() failed, expected message: %s, got %s", msg2, jl.Message)
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}
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b.Reset()
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l.l = -99
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l.Errorf(Log{Direction: DirServerToClient, Format: "test %s", Messages: []interface{}{"foo"}})
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if b.String() != "" {
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t.Error("Error message was not expected to be logged")
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}
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}
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func unmarshalLog(j []byte) (jsonLog, error) {
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var jl jsonLog
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if err := json.Unmarshal(j, &jl); err != nil {
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return jl, err
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}
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return jl, nil
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}
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27
log/log.go
27
log/log.go
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@ -21,6 +21,15 @@ const (
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LevelDebug
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)
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const (
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// DirString is a constant used for the structured logger
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DirString = "direction"
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// DirFromString is a constant used for the structured logger
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DirFromString = "from"
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// DirToString is a constant used for the structured logger
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DirToString = "to"
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)
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// Direction is a type wrapper for the direction a debug log message goes
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type Direction int
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@ -51,3 +60,21 @@ func (l Log) directionPrefix() string {
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}
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return p
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}
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// directionFrom will return a from direction string depending on the Direction.
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func (l Log) directionFrom() string {
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p := "server"
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if l.Direction == DirClientToServer {
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p = "client"
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}
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return p
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}
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// directionTo will return a to direction string depending on the Direction.
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func (l Log) directionTo() string {
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p := "client"
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if l.Direction == DirClientToServer {
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p = "server"
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}
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return p
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}
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