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https://codeberg.org/forgejo/forgejo.git
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c738542201
This PR adds opentelemetry and chi wrapper to have basic instrumentation <!--start release-notes-assistant--> ## Draft release notes <!--URL:https://codeberg.org/forgejo/forgejo--> - Features - [PR](https://codeberg.org/forgejo/forgejo/pulls/3972): <!--number 3972 --><!--line 0 --><!--description YWRkIHN1cHBvcnQgZm9yIGJhc2ljIHJlcXVlc3QgdHJhY2luZyB3aXRoIG9wZW50ZWxlbWV0cnk=-->add support for basic request tracing with opentelemetry<!--description--> <!--end release-notes-assistant--> Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/3972 Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org> Co-authored-by: TheFox0x7 <thefox0x7@gmail.com> Co-committed-by: TheFox0x7 <thefox0x7@gmail.com>
90 lines
2.3 KiB
Go
90 lines
2.3 KiB
Go
// Copyright 2024 TheFox0x7. All rights reserved.
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// SPDX-License-Identifier: EUPL-1.2
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package opentelemetry
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import (
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"context"
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"net/url"
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"strings"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/sdk/resource"
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semconv "go.opentelemetry.io/otel/semconv/v1.25.0"
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)
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const (
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decoderTelemetrySdk = "sdk"
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decoderProcess = "process"
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decoderOS = "os"
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decoderHost = "host"
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)
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func newResource(ctx context.Context) (*resource.Resource, error) {
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opts := []resource.Option{
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resource.WithAttributes(parseSettingAttributes(setting.OpenTelemetry.ResourceAttributes)...),
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}
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opts = append(opts, parseDecoderOpts()...)
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opts = append(opts, resource.WithAttributes(
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semconv.ServiceName(setting.OpenTelemetry.ServiceName),
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semconv.ServiceVersion(setting.ForgejoVersion),
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))
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return resource.New(ctx, opts...)
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}
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func parseDecoderOpts() []resource.Option {
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var opts []resource.Option
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for _, v := range strings.Split(setting.OpenTelemetry.ResourceDetectors, ",") {
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switch v {
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case decoderTelemetrySdk:
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opts = append(opts, resource.WithTelemetrySDK())
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case decoderProcess:
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opts = append(opts, resource.WithProcess())
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case decoderOS:
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opts = append(opts, resource.WithOS())
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case decoderHost:
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opts = append(opts, resource.WithHost())
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case "": // Don't warn on empty string
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default:
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log.Warn("Ignoring unknown resource decoder option: %s", v)
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}
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}
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return opts
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}
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func parseSettingAttributes(s string) []attribute.KeyValue {
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var attrs []attribute.KeyValue
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rawAttrs := strings.TrimSpace(s)
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if rawAttrs == "" {
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return attrs
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}
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pairs := strings.Split(rawAttrs, ",")
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var invalid []string
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for _, p := range pairs {
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k, v, found := strings.Cut(p, "=")
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if !found {
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invalid = append(invalid, p)
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continue
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}
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key := strings.TrimSpace(k)
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val, err := url.PathUnescape(strings.TrimSpace(v))
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if err != nil {
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// Retain original value if decoding fails, otherwise it will be
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// an empty string.
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val = v
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log.Warn("Otel resource attribute decoding error, retaining unescaped value. key=%s, val=%s", key, val)
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}
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attrs = append(attrs, attribute.String(key, val))
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}
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if len(invalid) > 0 {
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log.Warn("Partial resource, missing values: %v", invalid)
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}
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return attrs
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}
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