mirror of https://github.com/perkeep/perkeep.git
100 lines
2.7 KiB
Go
100 lines
2.7 KiB
Go
/*
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Copyright 2018 The Perkeep Authors
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package main
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import (
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"context"
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"io"
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"log"
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"os"
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"runtime"
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"cloud.google.com/go/logging"
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"go4.org/types"
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"google.golang.org/api/option"
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"perkeep.org/internal/osutil/gce"
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"perkeep.org/pkg/env"
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)
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// TODO(mpl): maybe export gce.writer, and reuse it here. Later.
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// gclWriter is an io.Writer, where each Write writes a log entry to Google
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// Cloud Logging.
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type gclWriter struct {
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severity logging.Severity
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logger *logging.Logger
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}
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func (w gclWriter) Write(p []byte) (n int, err error) {
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w.logger.Log(logging.Entry{
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Severity: w.severity,
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Payload: string(p),
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})
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return len(p), nil
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}
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// if a non-nil logging Client is returned, it should be closed before the
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// program terminates to flush any buffered log entries.
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func maybeSetupGoogleCloudLogging() io.Closer {
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if flagGCEProjectID == "" && flagGCELogName == "" && flagGCEJWTFile == "" {
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return types.NopCloser
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}
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if flagGCEProjectID == "" || flagGCELogName == "" || flagGCEJWTFile == "" {
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exitf("All of --gce_project_id, --gce_log_name, and --gce_jwt_file must be specified for logging on Google Cloud Logging.")
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}
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ctx := context.Background()
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logc, err := logging.NewClient(ctx,
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flagGCEProjectID, option.WithServiceAccountFile(flagGCEJWTFile))
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if err != nil {
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exitf("Error creating GCL client: %v", err)
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}
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if err := logc.Ping(ctx); err != nil {
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exitf("Google logging client not ready (ping failed): %v", err)
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}
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logw := gclWriter{
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severity: logging.Debug,
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logger: logc.Logger(flagGCELogName),
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}
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log.SetOutput(io.MultiWriter(os.Stderr, logw))
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return logc
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}
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// setupLoggingSyslog is non-nil on Unix. If it returns a non-nil io.Closer log
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// flush function, setupLogging returns that flush function.
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var setupLoggingSyslog func() io.Closer
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// setupLogging sets up logging and returns an io.Closer that flushes logs.
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func setupLogging() io.Closer {
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if *flagSyslog && runtime.GOOS == "windows" {
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exitf("-syslog not available on windows")
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}
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if fn := setupLoggingSyslog; fn != nil {
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if flusher := fn(); flusher != nil {
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return flusher
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}
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}
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if env.OnGCE() {
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lw, err := gce.LogWriter()
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if err != nil {
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log.Fatalf("Error setting up logging: %v", err)
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}
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log.SetOutput(lw)
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return lw
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}
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return maybeSetupGoogleCloudLogging()
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}
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