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Add native cloud logging support (#486)
* Add native cloud logging support * feedback
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| load("@io_bazel_rules_go//go:def.bzl", "go_library") | ||
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| go_library( | ||
| name = "cloudlog", | ||
| srcs = ["cloudlog.go"], | ||
| importpath = "github.com/openconfig/lemming/internal/cloudlog", | ||
| visibility = ["//:__subpackages__"], | ||
| deps = [ | ||
| "@com_google_cloud_go_logging//:logging", | ||
| "@com_google_cloud_go_logging//apiv2/loggingpb", | ||
| "@io_opentelemetry_go_otel_trace//:trace", | ||
| ], | ||
| ) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| // Copyright 2024 Google LLC | ||
| // | ||
| // 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. | ||
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| package cloudlog | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "log/slog" | ||
| "os" | ||
| "os/signal" | ||
| "runtime" | ||
| "syscall" | ||
| "time" | ||
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| "cloud.google.com/go/logging" | ||
| "cloud.google.com/go/logging/apiv2/loggingpb" | ||
| "go.opentelemetry.io/otel/trace" | ||
| ) | ||
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| // SetGlobal sets the global slog to use output a GCP cloud logging and stderr | ||
| func SetGlobalLogger(ctx context.Context, project, logName string) error { | ||
| cl, err := logging.NewClient(ctx, fmt.Sprintf("projects/%s", project)) | ||
| if err != nil { | ||
| return err | ||
| } | ||
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| h := &cloudLogHandle{ | ||
| Handler: slog.NewJSONHandler(os.Stderr, &slog.HandlerOptions{}), | ||
| l: cl.Logger(logName), | ||
| project: project, | ||
| } | ||
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| t := time.NewTicker(time.Second) | ||
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| sigs := make(chan os.Signal, 1) | ||
| signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM) | ||
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| go func() { | ||
| for { | ||
| select { | ||
| case <-sigs: | ||
| h.l.Flush() | ||
| case <-t.C: | ||
| if err := h.l.Flush(); err != nil { | ||
| fmt.Fprintf(os.Stderr, "log flush err: %v", err) | ||
| } | ||
| } | ||
| } | ||
| }() | ||
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| slog.SetDefault(slog.New(h)) | ||
| return nil | ||
| } | ||
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| type cloudLogHandle struct { | ||
| slog.Handler | ||
| l *logging.Logger | ||
| project string | ||
| } | ||
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| func (t *cloudLogHandle) Handle(ctx context.Context, record slog.Record) error { | ||
| payload := map[string]string{ | ||
| "message": record.Message, | ||
| } | ||
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| entry := logging.Entry{ | ||
| Timestamp: record.Time, | ||
| } | ||
| switch record.Level { | ||
| case slog.LevelError: | ||
| entry.Severity = logging.Error | ||
| case slog.LevelWarn: | ||
| entry.Severity = logging.Warning | ||
| case slog.LevelInfo: | ||
| entry.Severity = logging.Info | ||
| case slog.LevelDebug: | ||
| entry.Severity = logging.Debug | ||
| } | ||
| record.Attrs(func(a slog.Attr) bool { | ||
| payload[a.Key] = a.Value.String() | ||
| return true | ||
| }) | ||
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| entry.Payload = payload | ||
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| if s := trace.SpanContextFromContext(ctx); s.IsValid() { | ||
| entry.Trace = fmt.Sprintf("projects/%s/traces/%s", t.project, s.TraceID().String()) | ||
| entry.SpanID = s.SpanID().String() | ||
| entry.TraceSampled = s.IsSampled() | ||
| } | ||
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| fs := runtime.CallersFrames([]uintptr{record.PC}) | ||
| f, _ := fs.Next() | ||
| entry.SourceLocation = &loggingpb.LogEntrySourceLocation{ | ||
| File: f.File, | ||
| Line: int64(f.Line), | ||
| Function: f.Function, | ||
| } | ||
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| t.l.Log(entry) | ||
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| return t.Handler.Handle(ctx, record) | ||
| } |
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