/
zap.go
76 lines (66 loc) · 1.79 KB
/
zap.go
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/*
Package goazap contains an adapter that makes it possible to configure goa so it uses zap
as logger backend.
Usage:
logger, err := zap.NewProduction()
...
// Initialize logger handler using zap package
service.WithLogger(goazap.New(logger))
// ... Proceed with configuring and starting the goa service
// In handlers:
goazap.Logger(ctx).Info("foo")
*/
package goazap
import (
"github.com/goadesign/goa"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"golang.org/x/net/context"
)
type adapter struct {
Logger *zap.Logger
}
// New wraps a zap logger into a goa logger adapter.
func New(logger *zap.Logger) goa.LogAdapter {
return &adapter{Logger: logger}
}
// Logger returns the zap logger stored in the given context if any, nil otherwise.
func Logger(ctx context.Context) *zap.Logger {
logger := goa.ContextLogger(ctx)
if a, ok := logger.(*adapter); ok {
return a.Logger
}
return nil
}
// Info logs informational messages using zap.
func (a *adapter) Info(msg string, data ...interface{}) {
fields := data2fields(data)
a.Logger.Info(msg, *fields...)
}
// Error logs error messages using zap.
func (a *adapter) Error(msg string, data ...interface{}) {
fields := data2fields(data)
a.Logger.Error(msg, *fields...)
}
// New creates a new logger given a context.
func (a *adapter) New(data ...interface{}) goa.LogAdapter {
fields := data2fields(data)
return &adapter{Logger: a.Logger.With(*fields...)}
}
func data2fields(keyvals []interface{}) *[]zapcore.Field {
n := (len(keyvals) + 1) / 2
fields := make([]zapcore.Field, n)
fi := 0
for i := 0; i < len(keyvals); i += 2 {
if key, ok := keyvals[i].(string); ok {
if i+1 < len(keyvals) {
v := keyvals[i+1]
fields[fi] = zap.Any(key, v)
}
} else {
fields[fi] = zap.Skip()
}
fi = fi + 1
}
return &fields
}