github.com/v2pro/plz@v0.0.0-20221028024117-e5f9aec5b631/examples/trace_logging/main.go (about)

     1  package main
     2  
     3  import (
     4  	"github.com/v2pro/plz/countlog"
     5  	"errors"
     6  )
     7  
     8  // when using --tags release, countlog.Trace will be empty and optimized away
     9  //go:noinline
    10  func trace_should_be_optimized_away() {
    11  	countlog.Trace("event!trace can be optimized", "key", "value")
    12  }
    13  
    14  // if err != nil will not be checked twice when inlined
    15  //go:noinline
    16  func trace_call_should_combine_the_error_checking() int {
    17  	err := doSomething()
    18  	countlog.TraceCall("callee!doSomething", err)
    19  	if err != nil {
    20  		return 1
    21  	}
    22  	return 0
    23  }
    24  
    25  func doSomething() error {
    26  	return errors.New("abc")
    27  }
    28  
    29  func main() {
    30  	countlog.SetMinLevel(countlog.LevelTrace)
    31  	trace_should_be_optimized_away()
    32  	trace_call_should_combine_the_error_checking()
    33  }