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Martin Riedl 2024-01-03 21:25:52 +01:00
commit 8dde70c555
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.DS_Store
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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
"Licensor" shall mean the copyright owner or entity authorized by
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direction or management of such entity, whether by contract or
otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity
exercising permissions granted by this License.
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including but not limited to software source code, documentation
source, and configuration files.
"Object" form shall mean any form resulting from mechanical
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not limited to compiled object code, generated documentation,
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"Work" shall mean the work of authorship, whether in Source or
Object form, made available under the License, as indicated by a
copyright notice that is included in or attached to the work
(an example is provided in the Appendix below).
"Derivative Works" shall mean any work, whether in Source or Object
form, that is based on (or derived from) the Work and for which the
editorial revisions, annotations, elaborations, or other modifications
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of this License, Derivative Works shall not include works that remain
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"Contribution" shall mean any work of authorship, including
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for use, reproduction, or distribution of Your modifications, or
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5. Submission of Contributions. Unless You explicitly state otherwise,
any Contribution intentionally submitted for inclusion in the Work
by You to the Licensor shall be under the terms and conditions of
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Notwithstanding the above, nothing herein shall supersede or modify
the terms of any separate license agreement you may have executed
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6. Trademarks. This License does not grant permission to use the trade
names, trademarks, service marks, or product names of the Licensor,
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7. Disclaimer of Warranty. Unless required by applicable law or
agreed to in writing, Licensor provides the Work (and each
Contributor provides its Contributions) on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
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END OF TERMS AND CONDITIONS

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# License
```
Copyright 2023 Martin Riedl
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
```

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// Copyright 2023 Martin Riedl
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package golog
import (
"fmt"
"time"
)
type Entry struct {
Logger *Logger
Content []Content
Message string
Level Level
Time time.Time
}
type Content struct {
Key string `json:"key"`
Value any `json:"value"`
}
func NewEntry(logger *Logger) *Entry {
return &Entry{
Logger: logger,
Content: make([]Content, 0),
}
}
func (entry *Entry) With(key string, value any) *Entry {
entry.Content = append(entry.Content, Content{
Key: key,
Value: value,
})
return entry
}
func (entry *Entry) WithContent(content []Content) *Entry {
entry.Content = append(entry.Content, content...)
return entry
}
func (entry *Entry) Log(level Level, args ...any) {
entry.Message = fmt.Sprint(args...)
entry.Level = level
entry.Logger.LogEntry(entry)
}
func (entry *Entry) Fatal(args ...any) {
entry.Log(LevelFatal, args...)
}
func (entry *Entry) Error(args ...any) {
entry.Log(LevelError, args...)
}
func (entry *Entry) Warning(args ...any) {
entry.Log(LevelWarning, args...)
}
func (entry *Entry) Info(args ...any) {
entry.Log(LevelInfo, args...)
}
func (entry *Entry) Debug(args ...any) {
entry.Log(LevelDebug, args...)
}
func (entry *Entry) Trace(args ...any) {
entry.Log(LevelTrace, args...)
}

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// Copyright 2023 Martin Riedl
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package golog
type Formatter interface {
Begin(*Entry)
Process(*Entry)
End(*Entry) []byte
}

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// Copyright 2023 Martin Riedl
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package golog
import (
"encoding/json"
"log"
"time"
)
type FormatterJSON struct {
FlatContent bool
TimeFormat string
data map[string]interface{}
}
func NewFormatterJSON() *FormatterJSON {
return &FormatterJSON{
TimeFormat: time.RFC3339,
}
}
func (formatter *FormatterJSON) Begin(entry *Entry) {
// reset formatter
formatter.data = make(map[string]interface{})
// add timestamp
formatter.data["time"] = entry.Time.Format(formatter.TimeFormat)
// add log level
formatter.data["level"] = entry.Level.String()
}
func (formatter *FormatterJSON) Process(entry *Entry) {
// add message
formatter.data["message"] = entry.Message
// add additional fields
if formatter.FlatContent {
for _, content := range entry.Content {
formatter.data[content.Key] = content.Value
}
} else {
formatter.data["fields"] = entry.Content
}
}
func (formatter *FormatterJSON) End(entry *Entry) []byte {
// build JSON
data, err := json.Marshal(formatter.data)
if err != nil {
// marshal should never fail
log.Println(err)
return []byte{}
}
// return json data
return data
}

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// Copyright 2023 Martin Riedl
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package golog
import "testing"
func TestFormatterJson(t *testing.T) {
// prepare test data
entry := &Entry{
Message: "Some Text",
Content: []Content{
{Key: "k1", Value: "v1"},
{Key: "k2", Value: "v2"},
},
Level: LevelInfo,
}
result := `{"fields":[{"key":"k1","value":"v1"},{"key":"k2","value":"v2"}],"level":"INFO","message":"Some Text","time":"0001-01-01T00:00:00Z"}`
// execute formatter
formatter := NewFormatterJSON()
formatter.Begin(entry)
formatter.Process(entry)
data := formatter.End(entry)
if string(data) != result {
t.Error("received invalid JSON data", string(data))
}
}
func TestFormatterJsonFlat(t *testing.T) {
// prepare test data
entry := &Entry{
Message: "Some Text",
Content: []Content{
{Key: "k1", Value: "v1"},
{Key: "k2", Value: "v2"},
},
Level: LevelInfo,
}
result := `{"k1":"v1","k2":"v2","level":"INFO","message":"Some Text","time":"0001-01-01T00:00:00Z"}`
// execute formatter
formatter := NewFormatterJSON()
formatter.FlatContent = true
formatter.Begin(entry)
formatter.Process(entry)
data := formatter.End(entry)
if string(data) != result {
t.Error("received invalid JSON data", string(data))
}
}

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// Copyright 2023 Martin Riedl
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package golog
import (
"fmt"
"strings"
"time"
)
type FormatterKeyValue struct {
TimeFormat string
builder strings.Builder
isFirstKVWritten bool
}
func NewFormatterKeyValue() *FormatterKeyValue {
return &FormatterKeyValue{
TimeFormat: time.RFC3339,
}
}
func (formatter *FormatterKeyValue) Begin(entry *Entry) {
// reset builder
formatter.builder.Reset()
// add timestamp
formatter.addKV("time", entry.Time.Format(formatter.TimeFormat))
// add loglevel
formatter.addKV("level", entry.Level.String())
}
func (formatter *FormatterKeyValue) Process(entry *Entry) {
// add message
formatter.addKV("message", entry.Message)
// add additional fields
for _, content := range entry.Content {
formatter.addKV(content.Key, content.Value)
}
}
func (formatter *FormatterKeyValue) addKV(key string, value any) {
// convert any to string
val := fmt.Sprintf("%v", value)
// check, if value should be escaped
if strings.ContainsAny(val, " \t\n\r=") {
val = fmt.Sprintf("%q", val)
}
// add space, if required
if formatter.isFirstKVWritten {
formatter.builder.WriteString(" ")
}
formatter.isFirstKVWritten = true
// add field
formatter.builder.WriteString(key)
formatter.builder.WriteString("=")
formatter.builder.WriteString(val)
}
func (formatter *FormatterKeyValue) End(entry *Entry) []byte {
// send data
return []byte(formatter.builder.String())
}

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// Copyright 2023 Martin Riedl
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package golog
import "testing"
func TestFormatterKeyValue(t *testing.T) {
// prepare test data
entry := &Entry{
Message: "Some Text",
Content: []Content{
{Key: "k1", Value: "v1"},
{Key: "k2", Value: "v2"},
},
Level: LevelInfo,
}
result := `time=0001-01-01T00:00:00Z level=INFO message="Some Text" k1=v1 k2=v2`
// execute formatter
formatter := NewFormatterKeyValue()
formatter.Begin(entry)
formatter.Process(entry)
data := formatter.End(entry)
if string(data) != result {
t.Error("received invalid KV data", string(data))
}
}

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module gitlab.com/martinr92/golog
go 1.20

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// Copyright 2023 Martin Riedl
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package golog
type Level uint32
const (
LevelFatal Level = 0
LevelError Level = 10
LevelWarning Level = 20
LevelInfo Level = 30
LevelDebug Level = 40
LevelTrace Level = 50
)
func (level Level) String() string {
switch level {
case LevelFatal:
return "FATAL"
case LevelError:
return "ERROR"
case LevelWarning:
return "WARNING"
case LevelInfo:
return "INFO"
case LevelDebug:
return "DEBUG"
case LevelTrace:
return "TRACE"
default:
return "UNKNOWN"
}
}

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// Copyright 2023 Martin Riedl
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package golog
import "time"
var Default = NewLoggerDefault()
type Logger struct {
Level Level
Outputs []*Output
}
func NewLogger(level Level, outputs []*Output) *Logger {
return &Logger{
Level: LevelInfo,
Outputs: outputs,
}
}
func NewLoggerDefault() *Logger {
return NewLogger(LevelInfo, []*Output{NewOutputDefault()})
}
func (logger *Logger) LogEntry(entry *Entry) {
// check, if message should be printed
if entry.Level > logger.Level {
return
}
// set execution time
entry.Time = time.Now()
// run each output
for _, output := range logger.Outputs {
output.Send(entry)
}
}
func (logger *Logger) Log(level Level, args ...any) {
entry := NewEntry(logger)
entry.Log(level, args...)
}
func (logger *Logger) With(key string, value any) *Entry {
entry := NewEntry(logger)
entry.With(key, value)
return entry
}
func (logger *Logger) WithContent(content []Content) *Entry {
entry := NewEntry(logger)
entry.WithContent(content)
return entry
}
func (logger *Logger) Fatal(args ...any) {
logger.Log(LevelFatal, args...)
}
func (logger *Logger) Error(args ...any) {
logger.Log(LevelError, args...)
}
func (logger *Logger) Warning(args ...any) {
logger.Log(LevelWarning, args...)
}
func (logger *Logger) Info(args ...any) {
logger.Log(LevelInfo, args...)
}
func (logger *Logger) Debug(args ...any) {
logger.Log(LevelDebug, args...)
}
func (logger *Logger) Trace(args ...any) {
logger.Log(LevelTrace, args...)
}

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// Copyright 2023 Martin Riedl
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package golog
import "sync"
type Output struct {
Formatter Formatter
formatterLock sync.Mutex
Printer Printer
}
func NewOutput(formatter Formatter, printer Printer) *Output {
return &Output{
Formatter: formatter,
Printer: printer,
}
}
func NewOutputDefault() *Output {
return NewOutput(NewFormatterKeyValue(), NewPrinterStdout())
}
func (output *Output) Send(entry *Entry) {
output.format(entry)
}
func (output *Output) format(entry *Entry) {
output.formatterLock.Lock()
defer output.formatterLock.Unlock()
// run formatter
output.Formatter.Begin(entry)
// add entry data
output.Formatter.Process(entry)
// finalize formatter
output.Formatter.End(entry)
}

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// Copyright 2023 Martin Riedl
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package golog
type Printer interface {
Write(p []byte) (n int, err error)
}

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// Copyright 2023 Martin Riedl
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package golog
import "os"
type PrinterStdout struct {
out *os.File
}
func NewPrinterStdout() *PrinterStdout {
return &PrinterStdout{
out: os.Stdout,
}
}
func (printer *PrinterStdout) Write(p []byte) (n int, err error) {
return printer.out.Write(p)
}