dalog

Logger abstraction allowing JSON via Zap logger and string via Go's logger. Also supports a key value context. Features

Both JSON and column std output logger
Context based loggers
Support for pkg errors stack traces
DebugContext allows debug out put to be related and annotated
Environment variable for configuration

Options

DALOG_LOGGER=[ZAP|GO] - Define which logger to use
DALOG_DEBUG=[TRUE|FALSE] - include debug and stack log statements
DALOG_STACK=[TRUE|FALSE] - include stack traces in the error log statements

See it in action

Running make will compile, lint, vet and run tests dalog contains a lame test that is really just sample usage code (log_test.go).

JSON via Zap

os.Setenv("DALOG_LOGGER", "ZAP")
dalog.WithContext(dalog.WithID("A123"), dalog.WithHostname()).Infof("%s %s", "hello", "world")

{"level":"info","ts":1512254914.971346,"msg":"hello world","ID":"A123","Hostname":"MacBook-Pro.local"}

String via go log

os.Setenv("DALOG_LOGGER", "GO")
dalog.WithContext(dalog.WithID("A123"), dalog.WithHostname()).Infof("%s %s", "hello", "world")

2017/12/02 00:43:28 INFO hello world, ID=A123, Hostname=MacBook-Pro.local

Stack Traces

Stack traces are supported using pkg errors and error log message.

	e := errors.New("This is an error using pkg error")
	dalog.NoContext().Error(e)

JSON output

{"level":"error","ts":1514921204.09196,"msg":"This is an error using pkg error","stack":"\ngithub.com/craigivy/dalog_test.TestStack\n\t/Users/civerson/dev/go/src/github.com/craigivy/dalog/log_test.go:61\ntesting.tRunner\n\t/usr/local/Cellar/go/1.9.2/libexec/src/testing/testing.go:746\nruntime.goexit\n\t/usr/local/Cellar/go/1.9.2/libexec/src/runtime/asm_amd64.s:2337"}

Standard output

2018/01/02 12:26:44 ERROR This is an error using pkg error, stack=
github.com/craigivy/dalog_test.TestStack
        /Users/civerson/dev/go/src/github.com/craigivy/dalog/log_test.go:61
testing.tRunner
        /usr/local/Cellar/go/1.9.2/libexec/src/testing/testing.go:746
runtime.goexit
        /usr/local/Cellar/go/1.9.2/libexec/src/runtime/asm_amd64.s:2337