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54 lines
1.5 KiB
Go
54 lines
1.5 KiB
Go
// Copyright 2018 Adam Tauber
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package debug
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import (
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"io"
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"log"
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"os"
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"sync/atomic"
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"time"
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)
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// LogDebugger is the simplest debugger which prints log messages to the STDERR
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type LogDebugger struct {
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// Output is the log destination, anything can be used which implements them
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// io.Writer interface. Leave it blank to use STDERR
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Output io.Writer
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// Prefix appears at the beginning of each generated log line
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Prefix string
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// Flag defines the logging properties.
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Flag int
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logger *log.Logger
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counter int32
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start time.Time
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}
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// Init initializes the LogDebugger
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func (l *LogDebugger) Init() error {
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l.counter = 0
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l.start = time.Now()
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if l.Output == nil {
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l.Output = os.Stderr
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}
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l.logger = log.New(l.Output, l.Prefix, l.Flag)
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return nil
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}
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// Event receives Collector events and prints them to STDERR
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func (l *LogDebugger) Event(e *Event) {
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i := atomic.AddInt32(&l.counter, 1)
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l.logger.Printf("[%06d] %d [%6d - %s] %q (%s)\n", i, e.CollectorID, e.RequestID, e.Type, e.Values, time.Since(l.start))
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}
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