commit b583af1973dabf02dd6272e7f736716fa4587ab6 Author: Rene Nochebuena Guerrero Date: Fri May 29 16:09:54 2026 +0000 feat(telemetry): initial implementation — OpenTelemetry traces, metrics, logs (v1.0.0) Introduces code.nochebuena.dev/einherjar/telemetry — the observability bootstrap starter for the Einherjar framework. Absorbs the telemetry package from micro-lib, migrating from OpenCensus to OpenTelemetry SDK v1.42. Bootstrap functions (not lifecycle.Component — telemetry must be initialized before the launcher starts, and its shutdown must run after all components stop): - New(ctx, cfg) (func(context.Context) error, error) — production mode; exports traces, metrics, and logs via OTLP over gRPC to the configured endpoint; returns a shutdown function to be deferred in main() - NewConsole(ctx, logger, cfg) (func(context.Context) error, error) — development mode; writes structured telemetry to the provided logging.Logger; no network dependency; suitable for local development and CI Config (EINHERJAR_OTEL_* env vars): ServiceName(required), ServiceVersion(unknown), Environment(development), OTLPEndpoint(required for New), OTLPInsecure(false) ConsoleConfig (EINHERJAR_OTEL_* env vars): ServiceName(required), ServiceVersion(unknown), Environment(development) - identifiable.go: package-level Module variable (observability.Identifiable) for version identification — telemetry bootstraps before the launcher; not registered as a lifecycle component diff --git a/.gitea/CODEOWNERS b/.gitea/CODEOWNERS new file mode 100644 index 0000000..3a6b985 --- /dev/null +++ b/.gitea/CODEOWNERS @@ -0,0 +1 @@ +* @einherjar/CoreDevelopers @einherjar/Agents diff --git a/.gitea/pull_request_template.md b/.gitea/pull_request_template.md new file mode 100644 index 0000000..1bf0362 --- /dev/null +++ b/.gitea/pull_request_template.md @@ -0,0 +1,70 @@ +## Summary + + + +--- + +## Type of change + +- [ ] Bug fix — non-breaking change that resolves an issue +- [ ] New feature — non-breaking addition of functionality +- [ ] Breaking change — alters existing behavior or public API +- [ ] Documentation update +- [ ] Refactor — no functional change, no new API surface +- [ ] Test improvement + +--- + +## Description + + + +--- + +## Testing + +- [ ] I added or updated tests that cover my changes +- [ ] All tests pass locally — `go test ./...` +- [ ] No formatting issues — `gofmt -l .` produces no output +- [ ] No vet warnings — `go vet ./...` is clean + +--- + +## Checklist + +- [ ] At most one exported type per non-test `.go` file (CT-6) +- [ ] No new external dependencies added without prior discussion in an issue +- [ ] Public API changes are reflected in `CHANGELOG.md` +- [ ] Breaking changes include a migration note in the PR description above + +--- + +## Contributor License Agreement + +> **This PR will not be merged until the CLA comment is present.** + +Before a Maintainer reviews your code, you must post the following text **as a comment on this PR** — not here in the description. PR description checkboxes can be silently toggled by anyone; a comment is a timestamped, author-attributed record that cannot be quietly removed. + +**Copy and post this exact text as a PR comment:** + +--- + +> I have read the Einherjar Contributor License Agreement (CLA.md) and I agree to all its terms. +> I confirm this Contribution is my original work. I grant the Maintainers the rights described +> therein, including the right to relicense, and I retain ownership of my copyright. +> This agreement covers all future Contributions I submit to any Einherjar repository under +> this account. + +--- + +First time contributing? Read [CLA.md](../CLA.md) for the full agreement before posting the comment. + +If you are contributing on behalf of a company, an authorized representative of that company must post the comment. + + diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..f68b26c --- /dev/null +++ b/.gitignore @@ -0,0 +1,38 @@ +# ── Release workflow helpers ────────────────────────────────────────────────── +COMMIT.md +PR.md +RELEASE.md + +# ── Go build artifacts ──────────────────────────────────────────────────────── +*.exe +*.exe~ +*.dll +*.so +*.dylib +*.test +*.out +/dist/ +/bin/ + +# ── Go workspace (local development only) ──────────────────────────────────── +go.work +go.work.sum + +# ── Dependency vendor directory ─────────────────────────────────────────────── +vendor/ + +# ── Coverage output ─────────────────────────────────────────────────────────── +coverage.out +coverage.html +*.coverprofile + +# ── OS artifacts ───────────────────────────────────────────────────────────── +.DS_Store +Thumbs.db + +# ── Editor artifacts ────────────────────────────────────────────────────────── +.idea/ +.vscode/ +*.swp +*.swo +*~ diff --git a/CLA.md b/CLA.md new file mode 100644 index 0000000..2850689 --- /dev/null +++ b/CLA.md @@ -0,0 +1,90 @@ +# Contributor License Agreement + +By contributing to any Einherjar repository, you agree to the terms of this Contributor License Agreement ("Agreement"). Please read it carefully before submitting your first Pull Request. + +--- + +## 1. Definitions + +| Term | Meaning | +|---|---| +| **You** | The individual or legal entity submitting a Contribution | +| **Contribution** | Any original work — source code, documentation, tests, configuration — submitted to an Einherjar repository | +| **Project** | The Einherjar framework and all repositories under `code.nochebuena.dev/einherjar/` | +| **Maintainers** | The individuals responsible for maintaining the Project | + +--- + +## 2. You Retain Ownership + +This Agreement does **not** transfer your copyright to the Maintainers. You remain the legal owner of your Contribution. What you grant here is a broad license to use it — not ownership of it. + +--- + +## 3. Copyright License Grant + +You grant the Maintainers and all recipients of the Project a **perpetual, worldwide, non-exclusive, royalty-free, irrevocable** license to: + +- Reproduce, modify, and create derivative works of your Contribution +- Publicly display and perform your Contribution +- Distribute your Contribution and derivative works, in source or compiled form, under any terms +- Sublicense the above rights to third parties +- **Relicense** your Contribution under a different open-source or commercial license at the Maintainers' sole discretion + +The Maintainers commit to keeping the Project available under at least one OSI-approved open-source license at all times. + +--- + +## 4. Patent License Grant + +You grant the Maintainers and all recipients of the Project a **perpetual, worldwide, non-exclusive, royalty-free, irrevocable** patent license to make, use, sell, offer for sale, import, and distribute your Contribution — limited to patent claims you own or control that are necessarily infringed by your Contribution alone, or in combination with the Project to which you submitted it. + +--- + +## 5. Your Representations + +By submitting a Contribution, you confirm that: + +1. **Original work.** The Contribution is your original work, or you have the legal right to submit it under these terms. +2. **No infringement.** To your knowledge, the Contribution does not infringe any third-party intellectual property rights, including patents, copyrights, and trade secrets. +3. **Employer rights.** If your employer holds rights over intellectual property you create, you have obtained written permission to submit the Contribution on behalf of that employer, or your employer has explicitly waived such rights for contributions to open-source projects. +4. **No warranty implied.** You understand that your Contribution may or may not be included in the Project, and the Maintainers are under no obligation to use it. + +--- + +## 6. No Support Obligation + +You are not required to provide maintenance, support, or updates for your Contributions. They are accepted **"as-is"**, without any warranty of fitness for a particular purpose or correctness. + +--- + +## 7. How to Sign + +Consent is given by **posting a comment** on your Pull Request with the following exact text: + +``` +I have read the Einherjar Contributor License Agreement (CLA.md) and I agree to all its terms. +I confirm this Contribution is my original work. I grant the Maintainers the rights described +therein, including the right to relicense, and I retain ownership of my copyright. +This agreement covers all future Contributions I submit to any Einherjar repository under +this account. +``` + +**Why a comment and not a checkbox?** +PR description checkboxes can be silently toggled on and off by anyone with write access to the branch at any time. A comment creates a timestamped, author-attributed record in the PR activity log — it cannot be quietly retracted. If a comment is deleted, the deletion itself is visible in the activity log. + +No handwritten or electronic signature is required beyond the comment above. A Maintainer will verify the comment before merging. PRs without the comment will not be merged. + +If you are contributing on behalf of a company or organization, ensure that an authorized representative of that entity has reviewed and accepted these terms before submitting. The comment must be posted by the account that owns the Contribution. + +--- + +## 8. Governing Terms + +This Agreement is intended to be simple and broadly fair. It follows the model established by widely adopted CLAs from the Apache Software Foundation, Google, and MongoDB — granting the Project the flexibility to evolve while fully preserving your ownership of what you wrote. + +If any provision of this Agreement is found unenforceable, the remaining provisions continue in full effect. + +--- + +*For those who come after. — The Einherjar Maintainers* diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md new file mode 100644 index 0000000..ed3e1d0 --- /dev/null +++ b/CONTRIBUTING.md @@ -0,0 +1,247 @@ +# Contributing to Einherjar + +Thank you for your interest in contributing to Einherjar. This document explains everything you need to know before sending your first Pull Request. + +Einherjar is developed and maintained by **NOCHEBUENADEV**, the trade name of its founder operating as a *Persona Física con Actividad Empresarial* (PFAE) under Mexican law. Contributions are welcome and valued — but they are accepted under the terms described here, so please read this document fully before you begin. + +--- + +## Table of Contents + +1. [Before You Start](#1-before-you-start) +2. [Legal: CLA and Copyright](#2-legal-cla-and-copyright) +3. [Development Setup](#3-development-setup) +4. [Code Standards](#4-code-standards) +5. [Commit Messages](#5-commit-messages) +6. [Submitting a Pull Request](#6-submitting-a-pull-request) +7. [Reporting Bugs](#7-reporting-bugs) +8. [Requesting Features](#8-requesting-features) +9. [What Gets Accepted](#9-what-gets-accepted) + +--- + +## 1. Before You Start + +**Open an issue first for anything non-trivial.** + +Before you write a line of code, open an issue describing what you want to change and why. This protects your time: a change that seems straightforward may conflict with a planned refactor, an architectural decision, or the project's direction. Getting alignment before coding means your PR will not be rejected for reasons unrelated to its quality. + +Exceptions where you can skip the issue: +- Typo or documentation-only fix +- Test coverage improvement for existing behavior +- Trivially obvious bug with a clear, contained fix + +**Do not submit a PR that changes the public API of any module without prior discussion.** Every Einherjar module has a stability contract. Breaking changes require a major version bump and coordinated updates across dependent modules. + +--- + +## 2. Legal: CLA and Copyright + +### Contributor License Agreement + +Before your first PR can be merged, you must sign the Contributor License Agreement by **posting a specific comment** on your Pull Request. The required comment text and full instructions are in [CLA.md](CLA.md). + +> Checkboxes in PR descriptions are not used for CLA consent — they can be silently toggled by anyone. A comment is a timestamped, author-attributed record. + +### Copyright + +All original code in Einherjar is copyright **NOCHEBUENADEV**. NOCHEBUENADEV is the registered trade name of its founder, a natural person operating under the Mexican *Persona Física con Actividad Empresarial* (PFAE) regime. + +When you contribute, you retain ownership of what you wrote. By signing the CLA you grant NOCHEBUENADEV a perpetual, irrevocable, worldwide license to use, modify, sublicense, and redistribute your Contribution — including the right to relicense it. See [CLA.md](CLA.md) for the full terms. + +### License + +Einherjar is licensed under the **GNU Affero General Public License v3.0** (AGPL-3.0). Your Contributions will be distributed under the same license unless the Maintainers exercise their relicensing rights under the CLA. + +--- + +## 3. Development Setup + +Einherjar uses a Go workspace (`go.work`) that spans all modules. You do not need to `go get` anything — local replacements are wired automatically. + +### Prerequisites + +- Go 1.26+ +- Git + +### Clone and initialize + +```bash +git clone https://code.nochebuena.dev/einherjar/ +cd + +# If working across multiple modules, clone the workspace root instead +# and all modules will resolve from disk via go.work. +``` + +### Verify your setup + +```bash +go build ./... # must compile clean +go vet ./... # no warnings +go test ./... # all tests pass +gofmt -l . # no output (no unformatted files) +``` + +All four commands must produce clean output before a PR will be reviewed. + +--- + +## 4. Code Standards + +These are non-negotiable. Every PR is checked against them. + +### One exported type per file (CT-6) + +Each non-test `.go` file may contain **at most one exported TypeSpec** (type, struct, or interface declaration). Unexported helpers, constants, and functions may coexist in the same file. `_test.go` files are exempt. + +This rule exists to keep the codebase navigable: a developer who knows the type name can immediately predict the file name. + +``` +provider.go ← type Provider interface { ... } ✓ one exported type +component.go ← type Component interface { ... } ✓ one exported type +new.go ← func New(...) + unexported impl ✓ zero exported types +``` + +### Formatting + +All code must be formatted with `gofmt`. No exceptions. If `gofmt -l .` produces output, the PR will not be merged. + +Do not configure your editor to use `goimports` as a replacement — it may add import groups that diverge from the project style. Use `gofmt` + manual import management. + +### Naming conventions + +- Follow standard Go naming: `CamelCase` for exported, `camelCase` for unexported. +- Interfaces that represent a capability are named with an agent noun: `Provider`, `Sender`, `Checkable`. +- Interfaces that represent a full component are named `Component`. +- Config structs are named `Config`. One config struct per module root. +- Constructors are named `New` (main) or `NewXxx` (adapters and variants). + +### Error handling + +- Use `core/xerrors` for all errors returned from public API. Never return raw `errors.New` or `fmt.Errorf` from exported functions. +- Error codes must map to the gRPC canonical set defined in `xerrors`. If you need a new code, open an issue first. +- Do not swallow errors silently. Log at the appropriate level or return them. + +### No comments unless necessary + +Do not add comments that restate what the code already says. Only add a comment when the **why** is non-obvious: a hidden constraint, a subtle invariant, a workaround for a known upstream bug. If removing the comment would not confuse a future reader, do not write it. + +### Dependencies + +Do not add new external dependencies without opening an issue and getting explicit approval first. Einherjar modules are deliberately lean. Every new dependency increases the blast radius for downstream consumers. + +--- + +## 5. Commit Messages + +Follow the [Conventional Commits](https://www.conventionalcommits.org/) specification: + +``` +(): + +[optional body] +``` + +| Type | When to use | +|---|---| +| `feat` | New exported function, type, or behavior | +| `fix` | Bug fix in existing behavior | +| `docs` | Documentation only | +| `test` | Tests only, no production code change | +| `refactor` | Code restructure with no behavior change | +| `chore` | Build system, CI, dependency updates | + +**Scope** is the module name without the `einherjar/` prefix: `core`, `web`, `db-postgres`, `cache-valkey`, etc. + +Examples: +``` +feat(cache-valkey): add IncrWithTTL for atomic fixed-window counters +fix(db-postgres): handle pgconn deadline exceeded as ErrDeadlineExceeded +docs(web): document rate limiter fail-open behavior +``` + +Keep the subject line under 72 characters. Write in the imperative mood ("add", "fix", "remove" — not "added", "fixes", "removed"). + +--- + +## 6. Submitting a Pull Request + +1. **Open an issue first** (see §1) unless the change is trivial. +2. Fork the repository and create a branch from `main`: + ```bash + git checkout -b feat/your-feature-name + ``` +3. Make your changes following the standards in §4. +4. Ensure all verification commands pass (§3). +5. Open the PR against `main` using the provided PR template. +6. **Post the CLA comment** on the PR before requesting review (see §2 and [CLA.md](CLA.md)). +7. Respond to review feedback. Keep the review cycle short by addressing all comments before re-requesting review. + +### Branch naming + +| Prefix | Use for | +|---|---| +| `feat/` | New features | +| `fix/` | Bug fixes | +| `docs/` | Documentation changes | +| `test/` | Test additions or improvements | +| `refactor/` | Refactors without behavior change | + +### PR size + +Keep PRs focused. A PR that does one thing is easier to review, faster to merge, and safer to revert if needed. If your change naturally spans multiple concerns, split it into multiple PRs. + +--- + +## 7. Reporting Bugs + +Open an issue with the following information: + +- **Module** affected (`einherjar/db-postgres`, `einherjar/web`, etc.) +- **Go version** (`go version`) +- **Minimal reproduction** — the smallest code snippet that demonstrates the problem +- **Expected behavior** vs **actual behavior** +- **Error output** if applicable (sanitize any credentials or sensitive data) + +Do not open a PR to fix a bug without first opening an issue. The bug may be intentional behavior, already fixed on `main`, or caused by something outside the module. + +--- + +## 8. Requesting Features + +Open an issue with: + +- **What** you want to add and **why** it belongs in the framework (not in application code) +- **Which module** it affects, or whether it requires a new module +- **API sketch** — what the interface, function signature, or config field would look like +- **Alternative approaches** you considered + +Feature requests that add a new external dependency, change a public interface, or cross module boundaries require longer discussion before approval. + +--- + +## 9. What Gets Accepted + +Einherjar is a **focused framework**. It covers a specific, well-defined set of infrastructure concerns. Contributions that fall outside that scope — however well-written — will not be merged. + +What fits: +- Bug fixes in existing behavior +- Performance improvements with benchmarks +- Missing error mappings for existing drivers +- Documentation improvements and example corrections +- Test coverage for untested edge cases + +What does not fit without prior architectural agreement: +- New modules (open an issue first) +- New external dependencies +- Changes to public interfaces in any module +- Features that belong in application code rather than the framework + +If you are unsure, open an issue and ask. It costs nothing and saves everyone time. + +--- + +*Einherjar was built for those who come after. Contributions that hold to that standard — clear, documented, tested, designed for the developer who was never in the room — are always welcome.* + +— **NOCHEBUENADEV** diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..0ad25db --- /dev/null +++ b/LICENSE @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +. diff --git a/README.md b/README.md new file mode 100644 index 0000000..653de84 --- /dev/null +++ b/README.md @@ -0,0 +1,107 @@ +# einherjar/telemetry + +[![version](https://img.shields.io/badge/version-v1.0.0-5C4EE5?style=flat-square)](https://code.nochebuena.dev/einherjar/telemetry) +[![license](https://img.shields.io/badge/license-AGPL--3.0-22863A?style=flat-square)](LICENSE) +[![go](https://img.shields.io/badge/Go-1.26+-00ADD8?style=flat-square&logo=go&logoColor=white)](https://go.dev) + +> Huginn and Muninn fly each day over the world. They see everything. They report back. + +`code.nochebuena.dev/einherjar/telemetry` is the OpenTelemetry bootstrap component of the Einherjar framework. It initializes traces, metrics, and structured logs via OTLP over gRPC — vendor-neutral, compatible with Grafana, Jaeger, Tempo, Datadog, and Honeycomb. A console mode is available for local development without a collector. + +Telemetry is **not** a `lifecycle.Component`. It must be initialized before the launcher and shut down after all components stop — the returned shutdown function handles this cleanly with a `defer`. + +--- + +## Usage + +### Production (OTLP/gRPC) + +```go +import ( + "code.nochebuena.dev/einherjar/telemetry" + "code.nochebuena.dev/einherjar/core/launcher" + "code.nochebuena.dev/einherjar/core/logz" +) + +ctx := context.Background() +logger := logz.New(logz.Config{JSON: true}) + +// Initialize telemetry BEFORE the launcher. +// Defer the shutdown BEFORE launcher.Run() so it fires after the launcher stops. +shutdown, err := telemetry.New(ctx, telemetry.DefaultConfig()) +if err != nil { + logger.Error("telemetry init failed", err) + os.Exit(1) +} +defer shutdown(ctx) + +lc := launcher.New(logger) +lc.Append(db, cache, srv) +lc.Run() +``` + +### Development (console / structured log output) + +No collector required. Spans and metrics are emitted to the configured `logging.Logger`. + +```go +shutdown, err := telemetry.NewConsole(ctx, logger, telemetry.DefaultConsoleConfig()) +if err != nil { + logger.Error("telemetry init failed", err) + os.Exit(1) +} +defer shutdown(ctx) +``` + +--- + +## Environment variables + +### Production (`telemetry.New`) + +| Variable | Required | Default | Description | +|---|---|---|---| +| `EINHERJAR_OTEL_SERVICE_NAME` | Yes | — | Service name reported to the collector | +| `EINHERJAR_OTEL_EXPORTER_ENDPOINT` | Yes | — | OTLP gRPC endpoint (e.g. `otel-collector:4317`) | +| `EINHERJAR_OTEL_SERVICE_VERSION` | No | `unknown` | Service version tag | +| `EINHERJAR_OTEL_ENVIRONMENT` | No | `development` | Deployment environment tag | +| `EINHERJAR_OTEL_EXPORTER_INSECURE` | No | `false` | Disable TLS for the exporter (dev/local) | + +### Development (`telemetry.NewConsole`) + +| Variable | Required | Default | Description | +|---|---|---|---| +| `EINHERJAR_OTEL_SERVICE_NAME` | Yes | — | Service name | +| `EINHERJAR_OTEL_SERVICE_VERSION` | No | `unknown` | Service version tag | +| `EINHERJAR_OTEL_ENVIRONMENT` | No | `development` | Deployment environment tag | + +--- + +## Dependency graph + +``` +contracts (zero dependencies) + ↑ + core + ↑ +telemetry (contracts, core, otel SDK + OTLP exporters) + ↑ + your app (initialized before launcher.Run) +``` + +--- + +## Verification + +```bash +cd telemetry/ +go build ./... +go vet ./... +go test ./... +gofmt -l . +``` + +--- + +> *Odin gave an eye for wisdom.* +> *Observability is the eye that watches the living system.* diff --git a/compliance_test.go b/compliance_test.go new file mode 100644 index 0000000..676f182 --- /dev/null +++ b/compliance_test.go @@ -0,0 +1,381 @@ +package telemetry + +import ( + "context" + "go/ast" + "go/parser" + "go/token" + "net" + "os" + "strings" + "sync" + "testing" + "time" + + "go.opentelemetry.io/otel" + sdkmetric "go.opentelemetry.io/otel/sdk/metric" + sdktrace "go.opentelemetry.io/otel/sdk/trace" + + "code.nochebuena.dev/einherjar/contracts/logging" +) + +// --------------------------------------------------------------------------- +// CT-6: ≤1 exported TypeSpec per file +// --------------------------------------------------------------------------- + +func TestAtMostOneExportedTypePerFile(t *testing.T) { + fset := token.NewFileSet() + entries, err := os.ReadDir(".") + if err != nil { + t.Fatalf("ReadDir: %v", err) + } + for _, entry := range entries { + name := entry.Name() + if !strings.HasSuffix(name, ".go") || strings.HasSuffix(name, "_test.go") { + continue + } + f, err := parser.ParseFile(fset, name, nil, 0) + if err != nil { + t.Fatalf("parse %s: %v", name, err) + } + count := 0 + for _, decl := range f.Decls { + gd, ok := decl.(*ast.GenDecl) + if !ok { + continue + } + for _, spec := range gd.Specs { + ts, ok := spec.(*ast.TypeSpec) + if !ok { + continue + } + if ts.Name.IsExported() { + count++ + } + } + } + if count > 1 { + t.Errorf("%s: has %d exported TypeSpecs, want ≤1", name, count) + } + } +} + +// --------------------------------------------------------------------------- +// DefaultConfig / DefaultConsoleConfig +// --------------------------------------------------------------------------- + +func TestDefaultConfig_OptionalFields(t *testing.T) { + cfg := DefaultConfig() + if cfg.ServiceVersion != "unknown" { + t.Errorf("ServiceVersion: got %q, want %q", cfg.ServiceVersion, "unknown") + } + if cfg.Environment != "development" { + t.Errorf("Environment: got %q, want %q", cfg.Environment, "development") + } + if cfg.OTLPInsecure { + t.Error("OTLPInsecure: want false by default") + } +} + +func TestDefaultConsoleConfig_OptionalFields(t *testing.T) { + cfg := DefaultConsoleConfig() + if cfg.ServiceVersion != "unknown" { + t.Errorf("ServiceVersion: got %q, want %q", cfg.ServiceVersion, "unknown") + } + if cfg.Environment != "development" { + t.Errorf("Environment: got %q, want %q", cfg.Environment, "development") + } +} + +// --------------------------------------------------------------------------- +// newResource +// --------------------------------------------------------------------------- + +func TestNewResource_Fields(t *testing.T) { + cfg := Config{ + ServiceName: "my-service", + ServiceVersion: "2.0.0", + Environment: "staging", + } + res := newResource(cfg) + + check := func(key, want string) { + t.Helper() + for _, kv := range res.Attributes() { + if string(kv.Key) == key { + if got := kv.Value.AsString(); got != want { + t.Errorf("resource[%s]: want %q, got %q", key, want, got) + } + return + } + } + t.Errorf("resource attribute %q not found", key) + } + + check("service.name", "my-service") + check("service.version", "2.0.0") + check("deployment.environment", "staging") +} + +func TestNewResource_MergesWithDefault(t *testing.T) { + res := newResource(Config{ServiceName: "svc"}) + if res == nil { + t.Fatal("newResource returned nil") + } + if len(res.Attributes()) == 0 { + t.Error("resource has no attributes") + } +} + +// --------------------------------------------------------------------------- +// New — OTLP bootstrap +// --------------------------------------------------------------------------- + +// fakeCollector starts a TCP listener that accepts connections but speaks no protocol. +func fakeCollector(t *testing.T) string { + t.Helper() + ln, err := net.Listen("tcp", "127.0.0.1:0") + if err != nil { + t.Fatalf("fakeCollector: %v", err) + } + t.Cleanup(func() { ln.Close() }) + go func() { + for { + conn, err := ln.Accept() + if err != nil { + return + } + conn.Close() + } + }() + return ln.Addr().String() +} + +func cfgWith(endpoint string) Config { + return Config{ + ServiceName: "test-service", + ServiceVersion: "0.0.1", + Environment: "test", + OTLPEndpoint: endpoint, + OTLPInsecure: true, + } +} + +func TestNew_ShutdownCallable(t *testing.T) { + endpoint := fakeCollector(t) + ctx := context.Background() + + shutdown, err := New(ctx, cfgWith(endpoint)) + if err != nil { + t.Fatalf("New: %v", err) + } + if shutdown == nil { + t.Fatal("shutdown func is nil") + } + shutCtx, cancel := context.WithTimeout(ctx, 200*time.Millisecond) + defer cancel() + _ = shutdown(shutCtx) +} + +func TestNew_SetsGlobalTracerProvider(t *testing.T) { + endpoint := fakeCollector(t) + ctx := context.Background() + + shutdown, err := New(ctx, cfgWith(endpoint)) + if err != nil { + t.Fatalf("New: %v", err) + } + t.Cleanup(func() { + shutCtx, cancel := context.WithTimeout(ctx, 200*time.Millisecond) + defer cancel() + _ = shutdown(shutCtx) + }) + + if _, ok := otel.GetTracerProvider().(*sdktrace.TracerProvider); !ok { + t.Errorf("expected *sdktrace.TracerProvider, got %T", otel.GetTracerProvider()) + } +} + +func TestNew_SetsGlobalMeterProvider(t *testing.T) { + endpoint := fakeCollector(t) + ctx := context.Background() + + shutdown, err := New(ctx, cfgWith(endpoint)) + if err != nil { + t.Fatalf("New: %v", err) + } + t.Cleanup(func() { + shutCtx, cancel := context.WithTimeout(ctx, 200*time.Millisecond) + defer cancel() + _ = shutdown(shutCtx) + }) + + if _, ok := otel.GetMeterProvider().(*sdkmetric.MeterProvider); !ok { + t.Errorf("expected *sdkmetric.MeterProvider, got %T", otel.GetMeterProvider()) + } +} + +// --------------------------------------------------------------------------- +// NewConsole — logger-backed exporters +// --------------------------------------------------------------------------- + +// stubLogger captures log calls for test assertions. Implements logging.Logger. +type stubLogger struct { + mu sync.Mutex + logs []stubLog +} + +type stubLog struct { + level string + msg string +} + +func (s *stubLogger) Info(msg string, _ ...any) { + s.mu.Lock() + defer s.mu.Unlock() + s.logs = append(s.logs, stubLog{"info", msg}) +} + +func (s *stubLogger) Warn(msg string, _ ...any) { + s.mu.Lock() + defer s.mu.Unlock() + s.logs = append(s.logs, stubLog{"warn", msg}) +} + +func (s *stubLogger) Error(msg string, _ error, _ ...any) { + s.mu.Lock() + defer s.mu.Unlock() + s.logs = append(s.logs, stubLog{"error", msg}) +} + +func (s *stubLogger) Debug(msg string, _ ...any) { + s.mu.Lock() + defer s.mu.Unlock() + s.logs = append(s.logs, stubLog{"debug", msg}) +} + +func (s *stubLogger) With(_ ...any) logging.Logger { return s } +func (s *stubLogger) WithContext(_ context.Context) logging.Logger { return s } + +func (s *stubLogger) find(msg string) bool { + s.mu.Lock() + defer s.mu.Unlock() + for _, l := range s.logs { + if l.msg == msg { + return true + } + } + return false +} + +func consoleCfg() ConsoleConfig { + return ConsoleConfig{ + ServiceName: "test-svc", + ServiceVersion: "0.0.1", + Environment: "test", + } +} + +func TestNewConsole_ShutdownCallable(t *testing.T) { + logger := &stubLogger{} + ctx := context.Background() + + shutdown, err := NewConsole(ctx, logger, consoleCfg()) + if err != nil { + t.Fatalf("NewConsole: %v", err) + } + shutCtx, cancel := context.WithTimeout(ctx, 200*time.Millisecond) + defer cancel() + if err := shutdown(shutCtx); err != nil { + t.Errorf("shutdown: %v", err) + } +} + +func TestNewConsole_SetsGlobalTracerProvider(t *testing.T) { + logger := &stubLogger{} + ctx := context.Background() + + shutdown, err := NewConsole(ctx, logger, consoleCfg()) + if err != nil { + t.Fatalf("NewConsole: %v", err) + } + t.Cleanup(func() { + shutCtx, cancel := context.WithTimeout(ctx, 200*time.Millisecond) + defer cancel() + _ = shutdown(shutCtx) + }) + + if _, ok := otel.GetTracerProvider().(*sdktrace.TracerProvider); !ok { + t.Errorf("expected *sdktrace.TracerProvider, got %T", otel.GetTracerProvider()) + } +} + +func TestNewConsole_SetsGlobalMeterProvider(t *testing.T) { + logger := &stubLogger{} + ctx := context.Background() + + shutdown, err := NewConsole(ctx, logger, consoleCfg()) + if err != nil { + t.Fatalf("NewConsole: %v", err) + } + t.Cleanup(func() { + shutCtx, cancel := context.WithTimeout(ctx, 200*time.Millisecond) + defer cancel() + _ = shutdown(shutCtx) + }) + + if _, ok := otel.GetMeterProvider().(*sdkmetric.MeterProvider); !ok { + t.Errorf("expected *sdkmetric.MeterProvider, got %T", otel.GetMeterProvider()) + } +} + +func TestNewConsole_ExportsSpan(t *testing.T) { + logger := &stubLogger{} + ctx := context.Background() + + shutdown, err := NewConsole(ctx, logger, consoleCfg()) + if err != nil { + t.Fatalf("NewConsole: %v", err) + } + defer func() { + shutCtx, cancel := context.WithTimeout(ctx, 200*time.Millisecond) + defer cancel() + _ = shutdown(shutCtx) + }() + + tracer := otel.Tracer("test") + _, span := tracer.Start(ctx, "test-span") + span.End() // WithSyncer exports synchronously on End + + if !logger.find("otel: span") { + t.Error("expected logger to receive 'otel: span' after span.End()") + } +} + +func TestNewConsole_ExportsMetric(t *testing.T) { + logger := &stubLogger{} + ctx := context.Background() + + shutdown, err := NewConsole(ctx, logger, consoleCfg()) + if err != nil { + t.Fatalf("NewConsole: %v", err) + } + + meter := otel.Meter("test") + counter, err := meter.Int64Counter("test.counter") + if err != nil { + t.Fatalf("Int64Counter: %v", err) + } + counter.Add(ctx, 1) + + // Force export by shutting down — PeriodicReader flushes on shutdown. + shutCtx, cancel := context.WithTimeout(ctx, 2*time.Second) + defer cancel() + if err := shutdown(shutCtx); err != nil { + t.Errorf("shutdown: %v", err) + } + + if !logger.find("otel: metric") { + t.Error("expected logger to receive 'otel: metric' after shutdown flush") + } +} diff --git a/config.go b/config.go new file mode 100644 index 0000000..9e1325c --- /dev/null +++ b/config.go @@ -0,0 +1,25 @@ +package telemetry + +// Config holds OTel bootstrap configuration. +type Config struct { + // ServiceName identifies the service in traces, metrics, and logs. + ServiceName string `env:"EINHERJAR_OTEL_SERVICE_NAME,required"` + // ServiceVersion is the deployed version (e.g. "1.4.2"). + ServiceVersion string `env:"EINHERJAR_OTEL_SERVICE_VERSION" envDefault:"unknown"` + // Environment is the deployment environment (e.g. "production", "staging"). + Environment string `env:"EINHERJAR_OTEL_ENVIRONMENT" envDefault:"development"` + // OTLPEndpoint is the OTLP gRPC collector address (e.g. "alloy:4317"). + OTLPEndpoint string `env:"EINHERJAR_OTEL_EXPORTER_ENDPOINT,required"` + // OTLPInsecure disables TLS for the OTLP connection. Set true in development. + OTLPInsecure bool `env:"EINHERJAR_OTEL_EXPORTER_INSECURE" envDefault:"false"` +} + +// DefaultConfig returns a Config with optional fields set to production-safe defaults. +// Callers must supply ServiceName and OTLPEndpoint. +func DefaultConfig() Config { + return Config{ + ServiceVersion: "unknown", + Environment: "development", + OTLPInsecure: false, + } +} diff --git a/console.go b/console.go new file mode 100644 index 0000000..b3f3e83 --- /dev/null +++ b/console.go @@ -0,0 +1,176 @@ +package telemetry + +import ( + "context" + "errors" + + "go.opentelemetry.io/otel" + otellog "go.opentelemetry.io/otel/log" + "go.opentelemetry.io/otel/log/global" + "go.opentelemetry.io/otel/propagation" + sdklog "go.opentelemetry.io/otel/sdk/log" + sdkmetric "go.opentelemetry.io/otel/sdk/metric" + "go.opentelemetry.io/otel/sdk/metric/metricdata" + "go.opentelemetry.io/otel/sdk/resource" + sdktrace "go.opentelemetry.io/otel/sdk/trace" + semconv "go.opentelemetry.io/otel/semconv/v1.24.0" + + "code.nochebuena.dev/einherjar/contracts/logging" +) + +// NewConsole bootstraps the OTel SDK with logger-backed exporters for local development. +// All signals (traces, metrics, OTel log records) are emitted as structured log lines +// instead of being sent to a collector. Drop-in alternative to [New]. +// +// Warning: do not use the OTel slog bridge (otelslog) together with NewConsole. +// The bridge routes slog records into the OTel log API; logLogExporter then writes +// them back to the same logger — creating an infinite feedback loop. See package +// documentation for the full explanation and safe usage patterns. +func NewConsole(ctx context.Context, logger logging.Logger, cfg ConsoleConfig) (func(context.Context) error, error) { + // Empty schema URL avoids merge conflicts with resource.Default()'s internal schema URL. + res, err := resource.Merge( + resource.Default(), + resource.NewWithAttributes( + "", + semconv.ServiceName(cfg.ServiceName), + semconv.ServiceVersion(cfg.ServiceVersion), + ), + ) + if err != nil { + res = resource.Default() + } + + tp := sdktrace.NewTracerProvider( + sdktrace.WithSyncer(&logTraceExporter{logger: logger}), + sdktrace.WithResource(res), + ) + otel.SetTracerProvider(tp) + otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator( + propagation.TraceContext{}, + propagation.Baggage{}, + )) + + mp := sdkmetric.NewMeterProvider( + sdkmetric.WithReader(sdkmetric.NewPeriodicReader(&logMetricExporter{logger: logger})), + sdkmetric.WithResource(res), + ) + otel.SetMeterProvider(mp) + + lp := sdklog.NewLoggerProvider( + sdklog.WithProcessor(sdklog.NewBatchProcessor(&logLogExporter{logger: logger})), + sdklog.WithResource(res), + ) + global.SetLoggerProvider(lp) + + shutdown := func(ctx context.Context) error { + var errs []error + if err := tp.Shutdown(ctx); err != nil { + errs = append(errs, &providerErr{"trace", err}) + } + if err := mp.Shutdown(ctx); err != nil { + errs = append(errs, &providerErr{"metric", err}) + } + if err := lp.Shutdown(ctx); err != nil { + errs = append(errs, &providerErr{"log", err}) + } + return errors.Join(errs...) + } + return shutdown, nil +} + +// --- trace exporter --- + +type logTraceExporter struct{ logger logging.Logger } + +func (e *logTraceExporter) ExportSpans(_ context.Context, spans []sdktrace.ReadOnlySpan) error { + for _, s := range spans { + e.logger.Info("otel: span", + "name", s.Name(), + "trace_id", s.SpanContext().TraceID(), + "span_id", s.SpanContext().SpanID(), + "parent_span_id", s.Parent().SpanID(), + "kind", s.SpanKind(), + "duration_ms", s.EndTime().Sub(s.StartTime()).Milliseconds(), + "status", s.Status().Code, + ) + } + return nil +} + +func (e *logTraceExporter) Shutdown(_ context.Context) error { return nil } + +// --- metric exporter --- + +type logMetricExporter struct{ logger logging.Logger } + +func (e *logMetricExporter) Temporality(_ sdkmetric.InstrumentKind) metricdata.Temporality { + return metricdata.CumulativeTemporality +} + +func (e *logMetricExporter) Aggregation(k sdkmetric.InstrumentKind) sdkmetric.Aggregation { + return sdkmetric.DefaultAggregationSelector(k) +} + +func (e *logMetricExporter) Export(_ context.Context, rm *metricdata.ResourceMetrics) error { + for _, sm := range rm.ScopeMetrics { + for _, m := range sm.Metrics { + e.logMetric(m) + } + } + return nil +} + +func (e *logMetricExporter) logMetric(m metricdata.Metrics) { + switch d := m.Data.(type) { + case metricdata.Sum[int64]: + for _, dp := range d.DataPoints { + e.logger.Info("otel: metric", "name", m.Name, "kind", "sum", "value", dp.Value, "unit", m.Unit) + } + case metricdata.Sum[float64]: + for _, dp := range d.DataPoints { + e.logger.Info("otel: metric", "name", m.Name, "kind", "sum", "value", dp.Value, "unit", m.Unit) + } + case metricdata.Gauge[int64]: + for _, dp := range d.DataPoints { + e.logger.Info("otel: metric", "name", m.Name, "kind", "gauge", "value", dp.Value, "unit", m.Unit) + } + case metricdata.Gauge[float64]: + for _, dp := range d.DataPoints { + e.logger.Info("otel: metric", "name", m.Name, "kind", "gauge", "value", dp.Value, "unit", m.Unit) + } + case metricdata.Histogram[int64]: + for _, dp := range d.DataPoints { + e.logger.Info("otel: metric", "name", m.Name, "kind", "histogram", "count", dp.Count, "sum", dp.Sum, "unit", m.Unit) + } + case metricdata.Histogram[float64]: + for _, dp := range d.DataPoints { + e.logger.Info("otel: metric", "name", m.Name, "kind", "histogram", "count", dp.Count, "sum", dp.Sum, "unit", m.Unit) + } + } +} + +func (e *logMetricExporter) ForceFlush(_ context.Context) error { return nil } +func (e *logMetricExporter) Shutdown(_ context.Context) error { return nil } + +// --- log exporter --- + +type logLogExporter struct{ logger logging.Logger } + +func (e *logLogExporter) Export(_ context.Context, records []sdklog.Record) error { + for _, r := range records { + body := r.Body().AsString() + sev := r.Severity() + switch { + case sev >= otellog.SeverityError: + e.logger.Error("otel: log", nil, "body", body, "severity", r.SeverityText()) + case sev >= otellog.SeverityWarn: + e.logger.Warn("otel: log", "body", body, "severity", r.SeverityText()) + default: + e.logger.Info("otel: log", "body", body, "severity", r.SeverityText()) + } + } + return nil +} + +func (e *logLogExporter) ForceFlush(_ context.Context) error { return nil } +func (e *logLogExporter) Shutdown(_ context.Context) error { return nil } diff --git a/console_config.go b/console_config.go new file mode 100644 index 0000000..5406bf0 --- /dev/null +++ b/console_config.go @@ -0,0 +1,18 @@ +package telemetry + +// ConsoleConfig holds the minimum OTel configuration needed for console/dev mode. +// Only service identity fields are required — no OTLP endpoint. +type ConsoleConfig struct { + ServiceName string `env:"EINHERJAR_OTEL_SERVICE_NAME,required"` + ServiceVersion string `env:"EINHERJAR_OTEL_SERVICE_VERSION" envDefault:"unknown"` + Environment string `env:"EINHERJAR_OTEL_ENVIRONMENT" envDefault:"development"` +} + +// DefaultConsoleConfig returns a ConsoleConfig with optional fields set to defaults. +// Callers must supply ServiceName. +func DefaultConsoleConfig() ConsoleConfig { + return ConsoleConfig{ + ServiceVersion: "unknown", + Environment: "development", + } +} diff --git a/doc.go b/doc.go new file mode 100644 index 0000000..f684324 --- /dev/null +++ b/doc.go @@ -0,0 +1,80 @@ +// Package telemetry bootstraps the OpenTelemetry SDK for Einherjar applications. +// +// # Overview +// +// There are two bootstrap functions — one for production (OTLP over gRPC) and one +// for local development (structured log output). Both set the three OTel global +// providers so that all starters using otel.Tracer / otel.Meter / global.Logger +// auto-instrument without any code changes. +// +// This package is app-only: import it only from main packages. Never import it +// from a starter or library — starters use only the OTel API, which is a zero-cost +// no-op until a real SDK is wired up here. +// +// # Production: OTLP over gRPC +// +// [New] connects to a Grafana Alloy (or any OTLP-compatible) collector and +// exports traces → Tempo, metrics → Mimir, and logs → Loki. +// +// func main() { +// ctx := context.Background() +// +// shutdown, err := telemetry.New(ctx, telemetry.Config{ +// ServiceName: "order-service", +// ServiceVersion: "1.4.2", +// Environment: "production", +// OTLPEndpoint: "alloy:4317", +// OTLPInsecure: false, +// }) +// if err != nil { +// log.Fatalf("telemetry: %v", err) +// } +// defer shutdown(ctx) +// +// // Wire into the launcher so shutdown runs before process exit: +// // launcher.BeforeStop(func() error { return shutdown(ctx) }) +// } +// +// # Local Development: console mode +// +// [NewConsole] routes all three signals through a [logging.Logger] as structured +// log lines. No collector is required — spans, metrics, and OTel log records appear +// inline with your application logs. +// +// func main() { +// ctx := context.Background() +// logger := logz.New(logz.Config{}) +// +// shutdown, err := telemetry.NewConsole(ctx, logger, telemetry.ConsoleConfig{ +// ServiceName: "order-service", +// }) +// if err != nil { +// log.Fatalf("telemetry: %v", err) +// } +// defer shutdown(ctx) +// } +// +// # Avoiding the slog feedback loop +// +// logz is backed by slog. The OTel ecosystem provides a slog bridge +// (go.opentelemetry.io/contrib/bridges/otelslog) that forwards slog records into +// the OTel log API. Do NOT use that bridge together with [NewConsole]. +// +// The loop is: +// +// slog.Info("msg") +// → OTel log API (via slog bridge) +// → logLogExporter.Export() +// → logger.Info("otel: log", ...) ← this is slog again +// → OTel log API (via slog bridge) +// → ... ∞ +// +// The slog bridge is safe with [New] because the OTLP exporter sends records over +// the network — it never calls back into slog. The loop only occurs with [NewConsole] +// because its log exporter writes back to the same logger that feeds it. +// +// Rule of thumb: +// - [New] + slog bridge: safe ✓ +// - [NewConsole] + slog bridge: feedback loop ✗ +// - [NewConsole] without slog bridge: safe ✓ +package telemetry diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..68cfa47 --- /dev/null +++ b/go.mod @@ -0,0 +1,37 @@ +module code.nochebuena.dev/einherjar/telemetry + +go 1.26 + +require ( + code.nochebuena.dev/einherjar/contracts v1.0.0 + code.nochebuena.dev/einherjar/core v1.0.0 + go.opentelemetry.io/otel v1.42.0 + go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc v0.18.0 + go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.42.0 + go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.42.0 + go.opentelemetry.io/otel/log v0.18.0 + go.opentelemetry.io/otel/sdk v1.42.0 + go.opentelemetry.io/otel/sdk/log v0.18.0 + go.opentelemetry.io/otel/sdk/metric v1.42.0 +) + +require ( + github.com/cenkalti/backoff/v5 v5.0.3 // indirect + github.com/cespare/xxhash/v2 v2.3.0 // indirect + github.com/go-logr/logr v1.4.3 // indirect + github.com/go-logr/stdr v1.2.2 // indirect + github.com/google/uuid v1.6.0 // indirect + github.com/grpc-ecosystem/grpc-gateway/v2 v2.28.0 // indirect + go.opentelemetry.io/auto/sdk v1.2.1 // indirect + go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.42.0 // indirect + go.opentelemetry.io/otel/metric v1.42.0 // indirect + go.opentelemetry.io/otel/trace v1.42.0 // indirect + go.opentelemetry.io/proto/otlp v1.9.0 // indirect + golang.org/x/net v0.51.0 // indirect + golang.org/x/sys v0.41.0 // indirect + golang.org/x/text v0.34.0 // indirect + google.golang.org/genproto/googleapis/api v0.0.0-20260209200024-4cfbd4190f57 // indirect + google.golang.org/genproto/googleapis/rpc v0.0.0-20260209200024-4cfbd4190f57 // indirect + google.golang.org/grpc v1.79.2 // indirect + google.golang.org/protobuf v1.36.11 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..0f868bf --- /dev/null +++ b/go.sum @@ -0,0 +1,75 @@ +code.nochebuena.dev/einherjar/contracts v1.0.0 h1:hRudEtOIqU7vwedYLsCh8+9q5dCnKb61qX+zibqImRU= +code.nochebuena.dev/einherjar/contracts v1.0.0/go.mod h1:ccltUtrFb5+MEJdkx2VVEUL+xC5pupVlVVsMM8AlCWI= +code.nochebuena.dev/einherjar/core v1.0.0 h1:AueZgfjp3+rQmDKOxmJQ945TTh+sqC1l/xJdTOdbr9w= +code.nochebuena.dev/einherjar/core v1.0.0/go.mod h1:0IywfRnJXX9xXQO6iPVaq2QDlXbbpXrB8A4T7gO8nE4= +github.com/cenkalti/backoff/v5 v5.0.3 h1:ZN+IMa753KfX5hd8vVaMixjnqRZ3y8CuJKRKj1xcsSM= +github.com/cenkalti/backoff/v5 v5.0.3/go.mod h1:rkhZdG3JZukswDf7f0cwqPNk4K0sa+F97BxZthm/crw= +github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs= +github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= +github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= +github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A= +github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI= +github.com/go-logr/logr v1.4.3/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY= +github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag= +github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE= +github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek= +github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps= +github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8= +github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU= +github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0= +github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo= 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+google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco= +gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= +gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= diff --git a/identifiable.go b/identifiable.go new file mode 100644 index 0000000..d9bb42c --- /dev/null +++ b/identifiable.go @@ -0,0 +1,32 @@ +package telemetry + +import ( + "runtime/debug" + + "code.nochebuena.dev/einherjar/contracts/observability" +) + +// Module identifies this package to observability systems. +// telemetry bootstraps before the launcher and is not registered as a lifecycle +// component. Register Module manually with any version registry if needed. +var Module observability.Identifiable = &moduleID{} + +type moduleID struct{} + +const modulePath = "code.nochebuena.dev/einherjar/telemetry" + +func (m *moduleID) ModulePath() string { return modulePath } + +func (m *moduleID) ModuleVersion() string { + if info, ok := debug.ReadBuildInfo(); ok { + for _, dep := range info.Deps { + if dep.Path == modulePath { + return dep.Version + } + } + if info.Main.Path == modulePath { + return info.Main.Version + } + } + return "(devel)" +} diff --git a/telemetry.go b/telemetry.go new file mode 100644 index 0000000..22133ef --- /dev/null +++ b/telemetry.go @@ -0,0 +1,139 @@ +package telemetry + +import ( + "context" + "errors" + + "go.opentelemetry.io/otel" + "go.opentelemetry.io/otel/attribute" + otlploggrpc "go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc" + otlpmetricgrpc "go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc" + otlptracegrpc "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc" + "go.opentelemetry.io/otel/log/global" + "go.opentelemetry.io/otel/propagation" + sdklog "go.opentelemetry.io/otel/sdk/log" + sdkmetric "go.opentelemetry.io/otel/sdk/metric" + "go.opentelemetry.io/otel/sdk/resource" + sdktrace "go.opentelemetry.io/otel/sdk/trace" + semconv "go.opentelemetry.io/otel/semconv/v1.24.0" + + "code.nochebuena.dev/einherjar/core/xerrors" +) + +// New bootstraps the full OTel SDK: +// - TracerProvider → OTLP gRPC → Grafana Alloy → Tempo +// - MeterProvider → OTLP gRPC → Grafana Alloy → Mimir +// - LoggerProvider → OTLP gRPC → Grafana Alloy → Loki +// +// Sets the three OTel globals so all starters using the global API +// auto-instrument without importing this module. +// +// The returned shutdown function flushes all exporters and must be called +// before process exit (defer it in main or wire it into the launcher). +// Returns (shutdown, nil) on success, (nil, err) on failure. +func New(ctx context.Context, cfg Config) (func(context.Context) error, error) { + res := newResource(cfg) + + // --- TracerProvider (traces → Tempo) --- + traceOpts := []otlptracegrpc.Option{ + otlptracegrpc.WithEndpoint(cfg.OTLPEndpoint), + } + if cfg.OTLPInsecure { + traceOpts = append(traceOpts, otlptracegrpc.WithInsecure()) + } + traceExporter, err := otlptracegrpc.New(ctx, traceOpts...) + if err != nil { + return nil, xerrors.Internal("telemetry: trace exporter init failed").WithError(err) + } + tp := sdktrace.NewTracerProvider( + sdktrace.WithBatcher(traceExporter), + sdktrace.WithResource(res), + ) + otel.SetTracerProvider(tp) + otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator( + propagation.TraceContext{}, + propagation.Baggage{}, + )) + + // --- MeterProvider (metrics → Mimir) --- + metricOpts := []otlpmetricgrpc.Option{ + otlpmetricgrpc.WithEndpoint(cfg.OTLPEndpoint), + } + if cfg.OTLPInsecure { + metricOpts = append(metricOpts, otlpmetricgrpc.WithInsecure()) + } + metricExporter, err := otlpmetricgrpc.New(ctx, metricOpts...) + if err != nil { + _ = tp.Shutdown(ctx) + return nil, xerrors.Internal("telemetry: metric exporter init failed").WithError(err) + } + mp := sdkmetric.NewMeterProvider( + sdkmetric.WithReader(sdkmetric.NewPeriodicReader(metricExporter)), + sdkmetric.WithResource(res), + ) + otel.SetMeterProvider(mp) + + // --- LoggerProvider (logs → Loki) --- + logOpts := []otlploggrpc.Option{ + otlploggrpc.WithEndpoint(cfg.OTLPEndpoint), + } + if cfg.OTLPInsecure { + logOpts = append(logOpts, otlploggrpc.WithInsecure()) + } + logExporter, err := otlploggrpc.New(ctx, logOpts...) + if err != nil { + _ = tp.Shutdown(ctx) + _ = mp.Shutdown(ctx) + return nil, xerrors.Internal("telemetry: log exporter init failed").WithError(err) + } + lp := sdklog.NewLoggerProvider( + sdklog.WithProcessor(sdklog.NewBatchProcessor(logExporter)), + sdklog.WithResource(res), + ) + global.SetLoggerProvider(lp) + + shutdown := func(ctx context.Context) error { + var errs []error + if err := tp.Shutdown(ctx); err != nil { + errs = append(errs, &providerErr{"trace", err}) + } + if err := mp.Shutdown(ctx); err != nil { + errs = append(errs, &providerErr{"metric", err}) + } + if err := lp.Shutdown(ctx); err != nil { + errs = append(errs, &providerErr{"log", err}) + } + return errors.Join(errs...) + } + return shutdown, nil +} + +// providerErr labels a shutdown error with the provider name. +type providerErr struct { + provider string + err error +} + +func (e *providerErr) Error() string { + return "telemetry: " + e.provider + " provider shutdown: " + e.err.Error() +} + +func (e *providerErr) Unwrap() error { return e.err } + +// newResource builds an OTel resource with service identity and environment attributes. +func newResource(cfg Config) *resource.Resource { + // Empty schema URL avoids merge conflicts with resource.Default()'s internal schema URL. + r, err := resource.Merge( + resource.Default(), + resource.NewWithAttributes( + "", + semconv.ServiceName(cfg.ServiceName), + semconv.ServiceVersion(cfg.ServiceVersion), + attribute.String("deployment.environment", cfg.Environment), + ), + ) + if err != nil { + return resource.Default() + } + return r +}