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debug.go
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debug.go
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// Copyright 2015 The LUCI 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.
package monitor
import (
"context"
"os"
"github.com/golang/protobuf/proto"
"github.com/TriggerMail/luci-go/common/clock"
"github.com/TriggerMail/luci-go/common/logging"
pb "github.com/TriggerMail/luci-go/common/tsmon/ts_mon_proto"
"github.com/TriggerMail/luci-go/common/tsmon/types"
)
type debugMonitor struct {
path string
}
// NewDebugMonitor returns a Monitor that outputs metrics to a log, and
// optionally a file on disk.
func NewDebugMonitor(path string) Monitor {
return &debugMonitor{
path: path,
}
}
func (m *debugMonitor) ChunkSize() int {
return 0
}
func (m *debugMonitor) Send(ctx context.Context, cells []types.Cell) error {
str := proto.MarshalTextString(&pb.MetricsPayload{
MetricsCollection: SerializeCells(cells, clock.Now(ctx)),
})
logging.Infof(ctx, "Sending ts_mon metrics:\n%s", str)
if m.path != "" {
file, err := os.OpenFile(m.path, os.O_RDWR|os.O_APPEND|os.O_CREATE, 0664)
if err != nil {
logging.Errorf(ctx, "Failed to open file %s: %s", m.path, err)
return err
}
defer func() {
if err := file.Close(); err != nil {
logging.Errorf(ctx, "Failed to close file %s: %s", m.path, err)
}
}()
if _, err = file.WriteString(str); err != nil {
logging.Errorf(ctx, "Failed to write to the file %s: %s", m.path, err)
return err
}
}
return nil
}
func (m *debugMonitor) Close() error {
return nil
}