forked from cockroachdb/cockroach
/
structured.go
64 lines (58 loc) · 1.71 KB
/
structured.go
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// Copyright 2015 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
//
// Author: Spencer Kimball (spencer.kimball@gmail.com)
package log
import (
"bytes"
"fmt"
"golang.org/x/net/context"
"github.com/cockroachdb/cockroach/util/caller"
)
// makeMessage creates a structured log entry.
func makeMessage(ctx context.Context, format string, args []interface{}) string {
var buf bytes.Buffer
tags := contextLogTags(ctx)
if len(tags) > 0 {
buf.WriteString("[")
for i, t := range tags {
if i > 0 {
buf.WriteString(",")
}
buf.WriteString(t.name)
if value := t.value(); value != nil {
buf.WriteString("=")
fmt.Fprint(&buf, value)
}
}
buf.WriteString("] ")
}
if len(format) == 0 {
fmt.Fprint(&buf, args...)
} else {
fmt.Fprintf(&buf, format, args...)
}
return buf.String()
}
// addStructured creates a structured log entry to be written to the
// specified facility of the logger.
func addStructured(ctx context.Context, s Severity, depth int, format string, args []interface{}) {
if ctx == nil {
panic("nil context")
}
file, line, _ := caller.Lookup(depth + 1)
msg := makeMessage(ctx, format, args)
Trace(ctx, msg)
logging.outputLogEntry(s, file, line, msg)
}