Porting from kubicorn

rc-0.2.0
Kris Nova 2018-11-27 14:47:56 -08:00
parent a6893d8554
commit f6d6f945a8
5 changed files with 438 additions and 1 deletions

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# logger # logger
Moving my Go logger out into it's own repository
Ported from it's [original location](https://github.com/kubicorn/kubicorn/tree/master/pkg/logger) in the Kubicorn code base.
Simple golang logger
```go
package main
import (
"github.com/kris-nova/logger"
"fmt"
"os"
)
func main(){
// Most Verbose
//logger.Level = 4
// Normal
// No info or debug messages, only warnings and criticals
logger.Level = 2
// Off
//logger.Level = 0
err := fmt.Errorf("New error")
logger.Info("we found an error: %v", err)
logger.Debug("this is a useful message for software enigneers")
logger.Warning("something bad happened but the software can still run")
// Notice this does *NOT* exit!
logger.Critical("the software should stop running, this is bad")
// Now we have to exit
os.Exit(123)
}
```

38
example/example.go 100644
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package main
import (
"github.com/kris-nova/logger"
"fmt"
"os"
)
func main(){
// Most Verbose
//logger.Level = 4
// Normal
// No info or debug messages, only warnings and criticals
logger.Level = 2
// Off
//logger.Level = 0
logger.Always("This is always printed")
logger.Success("Hooray a good thing happened!")
err := fmt.Errorf("New error")
logger.Info("we found an error: %v", err)
logger.Debug("this is a useful message for software enigneers")
logger.Warning("something bad happened but the software can still run")
// Notice this does *NOT* exit!
logger.Critical("the software should stop running, this is bad")
// Now we have to exit
os.Exit(123)
}

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package main
import (
"github.com/kris-nova/logger"
"fmt"
"os"
)
func main(){
logger.Fabulous = true
logger.Color = false
logger.Level = 4
err := fmt.Errorf("New error")
logger.Always("This is always printed")
logger.Success("Hooray a good thing happened!")
logger.Info("we found an error: %v", err)
logger.Debug("this is a useful message for software enigneers")
logger.Warning("something bad happened but the software can still run")
// Notice this does *NOT* exit!
logger.Critical("the software should stop running, this is bad")
// Now we have to exit
os.Exit(123)
}

179
logger.go 100644
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// Copyright © 2017
//
// 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 logger
import (
"fmt"
"io"
"os"
"strings"
"time"
lol "github.com/kris-nova/lolgopher"
"github.com/fatih/color"
)
type Logger func(format string, a ...interface{})
const (
AlwaysLabel = "✿"
CriticalLabel = "✖"
DebugLabel = "▶"
InfoLabel = ""
SuccessLabel = "✔"
WarningLabel = "!"
)
var (
Level = 2
Color = true
Fabulous = false
FabulousWriter = lol.NewLolWriter()
FabulousTrueWriter = lol.NewTruecolorLolWriter()
TestMode = false
)
func Always(format string, a ...interface{}) {
a, w := extractLoggerArgs(format, a...)
s := fmt.Sprintf(label(format, AlwaysLabel), a...)
if !TestMode {
if Color {
w = color.Output
s = color.GreenString(s)
} else if Fabulous {
w = FabulousWriter
}
}
fmt.Fprintf(w, s)
}
func Critical(format string, a ...interface{}) {
if Level >= 1 {
a, w := extractLoggerArgs(format, a...)
s := fmt.Sprintf(label(format, CriticalLabel), a...)
if !TestMode {
if Color {
w = color.Output
s = color.RedString(s)
} else if Fabulous {
w = FabulousWriter
}
}
fmt.Fprintf(w, s)
}
}
func Info(format string, a ...interface{}) {
if Level >= 3 {
a, w := extractLoggerArgs(format, a...)
s := fmt.Sprintf(label(format, InfoLabel), a...)
if !TestMode {
if Color {
w = color.Output
s = color.CyanString(s)
} else if Fabulous {
w = FabulousWriter
}
}
fmt.Fprintf(w, s)
}
}
func Success(format string, a ...interface{}) {
if Level >= 3 {
a, w := extractLoggerArgs(format, a...)
s := fmt.Sprintf(label(format, SuccessLabel), a...)
if !TestMode {
if Color {
w = color.Output
s = color.CyanString(s)
} else if Fabulous {
w = FabulousWriter
}
}
fmt.Fprintf(w, s)
}
}
func Debug(format string, a ...interface{}) {
if Level >= 4 {
a, w := extractLoggerArgs(format, a...)
s := fmt.Sprintf(label(format, DebugLabel), a...)
if !TestMode {
if Color {
w = color.Output
s = color.GreenString(s)
} else if Fabulous {
w = FabulousWriter
}
}
fmt.Fprintf(w, s)
}
}
func Warning(format string, a ...interface{}) {
if Level >= 2 {
a, w := extractLoggerArgs(format, a...)
s := fmt.Sprintf(label(format, WarningLabel), a...)
if !TestMode {
if Color {
w = color.Output
s = color.GreenString(s)
} else if Fabulous {
w = FabulousWriter
}
}
fmt.Fprintf(w, s)
}
}
func extractLoggerArgs(format string, a ...interface{}) ([]interface{}, io.Writer) {
var w io.Writer = os.Stdout
if n := len(a); n > 0 {
// extract an io.Writer at the end of a
if value, ok := a[n-1].(io.Writer); ok {
w = value
a = a[0 : n-1]
}
}
return a, w
}
func label(format, label string) string {
t := time.Now()
rfct := t.Format(time.RFC3339)
if !strings.Contains(format, "\n") {
format = fmt.Sprintf("%s%s", format, "\n")
}
return fmt.Sprintf("%s [%s] %s", rfct, label, format)
}

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logger_test.go 100644
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// Copyright © 2017 The Kubicorn Authors
//
// 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 logger
import (
"bytes"
"fmt"
"regexp"
"strings"
"testing"
)
const (
format = "%v, %v, %v, all eyes on me!"
formatExp = `^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}.* \[%s\] \d, \d, \d, all eyes on me!`
)
var (
a = []interface{}{1, 2, 3}
)
func TestMain(m *testing.M) {
TestMode = true
m.Run()
}
func ExampleTestLog() {
Log(format, a...)
// Output: 1, 2, 3, all eyes on me!
}
func TestLog(t *testing.T) {
e := fmt.Sprintf(format, a...)
g := captureLoggerOutput(Log, format, a)
if strings.Compare(e, g) != 0 {
t.Fatalf("Log should produce '%v' but produces: %v", e, g)
}
}
func TestAlways(t *testing.T) {
e, err := regexp.Compile(fmt.Sprintf(formatExp, AlwaysLabel))
g := captureLoggerOutput(Always, format, a)
if err != nil {
t.Fatalf("Failed to compile regexp '%v': %v", e.String(), err)
}
if !e.MatchString(g) {
t.Fatalf("Always should produce a pattern '%v' but produces: %v", e.String(), g)
}
}
func TestCritical(t *testing.T) {
Level = 1
e, err := regexp.Compile(fmt.Sprintf(formatExp, CriticalLabel))
g := captureLoggerOutput(Critical, format, a)
if err != nil {
t.Fatalf("Failed to compile regexp '%v': %v", e.String(), err)
}
if !e.MatchString(g) {
t.Fatalf("Critical should produce a pattern '%v' but produces: %v", e.String(), g)
}
}
func TestInfo(t *testing.T) {
Level = 3
e, err := regexp.Compile(fmt.Sprintf(formatExp, InfoLabel))
g := captureLoggerOutput(Info, format, a)
if err != nil {
t.Fatalf("Failed to compile regexp '%v': %v", e.String(), err)
}
if !e.MatchString(g) {
t.Fatalf("Info should produce a pattern '%v' but produces: %v", e.String(), g)
}
}
func TestSuccess(t *testing.T) {
Level = 3
e, err := regexp.Compile(fmt.Sprintf(formatExp, SuccessLabel))
g := captureLoggerOutput(Success, format, a)
if err != nil {
t.Fatalf("Failed to compile regexp '%v': %v", e.String(), err)
}
if !e.MatchString(g) {
t.Fatalf("Success should produce a pattern '%v' but produces: %v", e.String(), g)
}
}
func TestDebug(t *testing.T) {
Level = 4
e, err := regexp.Compile(fmt.Sprintf(formatExp, DebugLabel))
g := captureLoggerOutput(Debug, format, a)
if err != nil {
t.Fatalf("Failed to compile regexp '%v': %v", e.String(), err)
}
if !e.MatchString(g) {
t.Fatalf("Info should produce a pattern '%v' but produces: %v", e.String(), g)
}
}
func TestWarning(t *testing.T) {
Level = 2
e, err := regexp.Compile(fmt.Sprintf(formatExp, WarningLabel))
g := captureLoggerOutput(Warning, format, a)
if err != nil {
t.Fatalf("Failed to compile regexp '%v': %v", e.String(), err)
}
if !e.MatchString(g) {
t.Fatalf("Info should produce a pattern '%v' but produces: %v", e.String(), g)
}
}
func captureLoggerOutput(l Logger, format string, a []interface{}) string {
b := new(bytes.Buffer)
l(format, append(a, b)...)
return b.String()
}