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Vladimir Hodakov
2018-11-29 20:32:51 +04:00
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# Compiled Object files, Static and Dynamic libs (Shared Objects)
*.o
*.a
*.so
# Folders
_obj
_test
# Architecture specific extensions/prefixes
*.[568vq]
[568vq].out
*.cgo1.go
*.cgo2.c
_cgo_defun.c
_cgo_gotypes.go
_cgo_export.*
_testmain.go
*.exe
*.test
*.prof

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Apache License
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http://www.apache.org/licenses/
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# dlog [![GoDoc](https://godoc.org/github.com/kirillDanshin/dlog?status.svg)](https://godoc.org/github.com/kirillDanshin/dlog) [![Go Report Card](https://goreportcard.com/badge/github.com/kirillDanshin/dlog)](https://goreportcard.com/report/github.com/kirillDanshin/dlog)
Simple build-time controlled debug log
# How to use
### Unbuffered
```go
package main
import "github.com/kirillDanshin/dlog"
func main() {
a := []int{2, 4, 8, 16, 32, 64, 128, 256, 512}
b := "some string"
dlog.D(a) // D'ump `a`
dlog.P(b) // P'rint `b`
dlog.F("%s format", b) // F'ormatted print
dlog.Ln(b) // print'Ln `b`
}
```
### Buffered
```go
package main
import "github.com/kirillDanshin/dlog"
func main() {
log := dlog.NewBuffered()
defer log.Release()
log.D(a) // D'ump `a`
log.P(b) // P'rint `b`
log.F("%s format", b) // F'ormatted print
log.Ln(b) // print'Ln `b`
dlog.Ln(log) // or fmt.Println("log") etc.
}
```
# Release
To disable logging in release build just run
```bash
go build
```
# Debug
To enable logging in debug build run
```bash
go build -tags "debug"
```

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// +build !debug
package dlog
// Ln is a build-time enabled println
func (b *Buffered) Ln(v ...interface{}) {}
// P is a build-time enabled print
func (b *Buffered) P(v ...interface{}) {}
// F is a build-time enabled printf
func (b *Buffered) F(f string, v ...interface{}) {}
// D dumps a value
func (b *Buffered) D(v ...interface{}) {}
func (b *Buffered) prepare() {}
func (b *Buffered) String() string {
return ""
}

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// +build debug
package dlog
import "fmt"
// Ln is a build-time enabled println
func (b *Buffered) Ln(v ...interface{}) {
b.prepare()
b.Lock()
fmt.Fprintln(b.bb, v...)
b.Unlock()
}
// P is a build-time enabled print
func (b *Buffered) P(v ...interface{}) {
b.prepare()
b.Lock()
fmt.Fprint(b.bb, v...)
b.Unlock()
}
// F is a build-time enabled printf
func (b *Buffered) F(f string, v ...interface{}) {
b.prepare()
b.Lock()
fmt.Fprintf(b.bb, f+"\n", v...)
b.Unlock()
}
// D dumps a value
func (b *Buffered) D(v ...interface{}) {
b.prepare()
b.Lock()
for _, v := range v {
fmt.Fprintf(b.bb, "%+#v\n", v)
}
b.Unlock()
}
func (b *Buffered) prepare() {
if b.bb == nil {
b = NewBuffered()
}
}
func (b *Buffered) String() string {
return string(b.bb.Bytes())
}

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package dlog
import (
"sync"
"github.com/valyala/bytebufferpool"
)
// Buffered thread-safe dlog
type Buffered struct {
bb *bytebufferpool.ByteBuffer
sync.RWMutex
}
// NewBuffered dlog
func NewBuffered() *Buffered {
return &Buffered{
bb: bytebufferpool.Get(),
}
}
// Release the buffer for dlog
func (b *Buffered) Release() {
if b.bb == nil {
return
}
b.Lock()
bytebufferpool.Put(b.bb)
b.Unlock()
}

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package dlog
import "fmt"
// Caller info
type Caller struct {
File string
Line int
FuncName string
}
func (c *Caller) String() string {
return fmt.Sprintf("Called from %s:%d (%s)", c.File, c.Line, c.FuncName)
}

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package dlog
const (
// CallerUnknown returned when caller isn't determined
CallerUnknown = "UNKNOWN"
// StateEnabled is to check if dlog.State enabled
StateEnabled = "enabled"
// StateDisabled is to check if dlog.State disabled
StateDisabled = "disabled"
)

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// +build !debug
package dlog
// D dumps a value
func D(v ...interface{}) {}
// F is a build-time disabled printf
func F(f string, v ...interface{}) {}
// P is a build-time disabled print
func P(v ...interface{}) {}
// Ln is a build-time disabled println
func Ln(v ...interface{}) {}

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// +build debug
package dlog
import (
"fmt"
"log"
"github.com/davecgh/go-spew/spew"
)
var spewInstance = spew.ConfigState{
Indent: "\t",
}
// D dumps a value
func D(v ...interface{}) {
for _, v := range v {
spewInstance.Dump(v)
}
}
// F is a build-time enabled printf
func F(f string, v ...interface{}) {
// log.Printf(f, v...)
spewInstance.Printf(f+"\n", v...)
}
// P is a build-time enabled print
func P(v ...interface{}) {
log.Print(v...)
fmt.Println()
}
// Ln is a build-time enabled println
func Ln(v ...interface{}) {
log.Println(v...)
}

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// Package dlog is a build-time
// enabled or disabled logger.
// Godoc shows disabled state
// because it built in by default.
package dlog

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// +build !debug
package dlog
// State handles dlog state. Can be "disabled" or "enabled".
const State = "disabled"

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// +build debug
package dlog
// State handles dlog state. Can be "disabled" or "enabled".
const State = "enabled"

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// +build !debug
package dlog
// D dumps a value
func (*WithCaller) D(v ...interface{}) {}
// F is a build-time enabled printf
func (*WithCaller) F(f string, v ...interface{}) {}
// P is a build-time enabled print
func (*WithCaller) P(v ...interface{}) {}
// Ln is a build-time enabled println
func (*WithCaller) Ln(v ...interface{}) {}
// GetCaller is a build-time disabled caller determining.
// Returns caller's file, line and func name
func GetCaller(_ ...int) (*Caller, bool) {
return &Caller{
File: CallerUnknown,
Line: 0,
FuncName: CallerUnknown,
}, false
}

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// +build debug
package dlog
import (
"log"
"runtime"
"strings"
"github.com/kirillDanshin/myutils"
)
// D dumps a value
func (*WithCaller) D(v ...interface{}) {
c, _ := GetCaller()
log.Print(c, ": [")
for _, v := range v {
spewInstance.Dump(v)
}
log.Println("]")
}
// F is a build-time enabled printf
func (*WithCaller) F(f string, v ...interface{}) {
c, _ := GetCaller()
// log.Printf(myutils.Concat(c.String(), "[\n\t", f, "\n]"), v...)
spewInstance.Printf(myutils.Concat(c.String(), "[\n\t", f, "\n]"), v...)
}
// P is a build-time enabled print
func (*WithCaller) P(v ...interface{}) {
c, _ := GetCaller()
log.Print(c, ": [\t")
log.Print(v...)
log.Println("]")
}
// Ln is a build-time enabled println
func (*WithCaller) Ln(v ...interface{}) {
c, _ := GetCaller()
log.Print(c, ": [\t")
log.Println(v...)
log.Println("]")
}
// GetCaller returns caller's file, line and func name
func GetCaller(stackBack ...int) (*Caller, bool) {
sb := 2
if len(stackBack) > 0 {
sb = stackBack[0] + 1
}
pc, file, line, ok := runtime.Caller(sb)
if !ok {
return &Caller{
File: CallerUnknown,
Line: 0,
FuncName: CallerUnknown,
}, false
}
if li := strings.LastIndex(file, "/"); li > 0 {
file = file[li+1:]
}
return &Caller{
File: file,
Line: line,
FuncName: runtime.FuncForPC(pc).Name(),
}, true
}

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package dlog
// WithCaller is a dlog with caller info prefix
type WithCaller struct{}