🔍 ZLOG - Structured Logging Interface

zlog aims to provide a consistent, easy to use structured logging interface.

The interface is inspired by zerolog and uses it for the default implementation that provides JSON.

zlog's API mimics the chaining API style from zerolog and logrus to provide a simple intuitive interface to the developers while allowing high performance implementations avoiding reflection and allocations.

Refer complete documentation : https://godoc.org/github.com/anuvu/zlog

Features

• Context based logging
• Log level support
• Near-zero allocations

Usage

import "github.com/anuvu/zlog"
log.Info().Msg("hello world")

// Output: {"level":"info","time":1494567715,"message":"hello world"}

Fields can be added to log messages

log.Info().Str("foo", "bar").Int("n", 123).Msg("hello world")

// Output: {"level":"info",foo":"bar","n":123,"message":"hello world"}

Create logger instance to manage different outputs

logger := zlog.New("test_logger").With().Timestamp().Logger()

logger.Info().Str("foo", "bar").Msg("hello world")

// Output: {"level":"info","time":1494567715,"message":"hello world","foo":"bar"}

Sub-loggers let you chain loggers with additional context

sublogger := log.With().Str("component": "foo").Logger()
sublogger.Info().Msg("hello world")

// Output: {"level":"info","time":1494567715,"message":"hello world","component":"foo"}

Set as standard logger output

log := zlog.New("test_logger").With().Str("foo", "bar").Logger()

stdlog.SetFlags(0)
stdlog.SetOutput(log)

stdlog.Print("hello world")

// Output: {"foo":"bar","message":"hello world"}

Field Types

Standard Types

• Str
• Bool
• Int
• Uint
• Float32

Advanced Fields

• Error: Takes an error and render it as a string using the error field name.
• Timestamp: Insert a timestamp field with time field name and formatted using RFC 3339 format.

Performance

$ go test -bench=. -benchmem
.........
9 total assertions

goos: darwin
goarch: amd64
pkg: github.com/anuvu/zlog
BenchmarkLogEmpty-8             50000000                31.2 ns/op             0 B/op          0 allocs/op
BenchmarkDisabled-8             200000000                6.37 ns/op            0 B/op          0 allocs/op
BenchmarkInfo-8                 30000000                50.7 ns/op             0 B/op          0 allocs/op
BenchmarkContextFields-8        10000000               143 ns/op               0 B/op          0 allocs/op
BenchmarkContextAppend-8        10000000               150 ns/op             832 B/op          3 allocs/op
BenchmarkLogFields-8            10000000               229 ns/op               0 B/op          0 allocs/op
BenchmarkLogFieldType/Int-8     30000000                49.1 ns/op             0 B/op          0 allocs/op
BenchmarkLogFieldType/Str-8     30000000                43.7 ns/op             0 B/op          0 allocs/op
BenchmarkLogFieldType/Err-8     30000000                49.5 ns/op             0 B/op          0 allocs/op
BenchmarkLogFieldType/Object-8  10000000               109 ns/op              64 B/op          2 allocs/op
BenchmarkLogFieldType/Bool-8    30000000                43.2 ns/op             0 B/op          0 allocs/op
PASS
ok      github.com/anuvu/zlog       17.846s