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logger.go
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logger.go
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// Copyright The OpenTelemetry 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 telemetrylogs // import "go.opentelemetry.io/collector/service/internal/telemetrylogs"
import (
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"go.uber.org/zap/zapgrpc"
"google.golang.org/grpc/grpclog"
"go.opentelemetry.io/collector/service/telemetry"
)
func NewLogger(cfg telemetry.LogsConfig, options []zap.Option) (*zap.Logger, error) {
// Copied from NewProductionConfig.
zapCfg := &zap.Config{
Level: zap.NewAtomicLevelAt(cfg.Level),
Development: cfg.Development,
Sampling: &zap.SamplingConfig{
Initial: 100,
Thereafter: 100,
},
Encoding: cfg.Encoding,
EncoderConfig: zap.NewProductionEncoderConfig(),
OutputPaths: cfg.OutputPaths,
ErrorOutputPaths: cfg.ErrorOutputPaths,
DisableCaller: cfg.DisableCaller,
DisableStacktrace: cfg.DisableStacktrace,
InitialFields: cfg.InitialFields,
}
if zapCfg.Encoding == "console" {
// Human-readable timestamps for console format of logs.
zapCfg.EncoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
}
logger, err := zapCfg.Build(options...)
if err != nil {
return nil, err
}
return logger, nil
}
// SetColGRPCLogger constructs a zapgrpc.Logger instance, and installs it as grpc logger, cloned from baseLogger with
// exact configuration. The minimum level of gRPC logs is set to WARN should the loglevel of the collector is set to
// INFO to avoid copious logging from grpc framework.
func SetColGRPCLogger(baseLogger *zap.Logger, loglevel zapcore.Level) *zapgrpc.Logger {
logger := zapgrpc.NewLogger(baseLogger.WithOptions(zap.WrapCore(func(core zapcore.Core) zapcore.Core {
var c zapcore.Core
var err error
if loglevel == zapcore.InfoLevel {
loglevel = zapcore.WarnLevel
}
// NewIncreaseLevelCore errors only if the new log level is less than the initial core level.
c, err = zapcore.NewIncreaseLevelCore(core, loglevel)
// In case of an error changing the level, move on, this happens when using the NopCore
if err != nil {
c = core
}
return c.With([]zapcore.Field{zap.Bool("grpc_log", true)})
})))
grpclog.SetLoggerV2(logger)
return logger
}