feat: implement initial application structure with health and hello endpoints

- Add bootstrap package to initialize application components including logger, tracer, and HTTP server.
- Create config package to load runtime settings from environment variables.
- Implement observability features including logging, metrics, and tracing.
- Add health check and hello use cases with corresponding HTTP handlers.
- Introduce middleware for request ID, access logging, metrics, and recovery.
- Set up HTTP router with defined routes for health and hello endpoints.
- Include tests for health and hello endpoints to ensure proper functionality.
- Add OpenTelemetry collector configuration for trace exporting.
This commit is contained in:
Nik Afiq 2026-03-05 21:22:43 +09:00
commit 657b6aeb22
28 changed files with 1205 additions and 0 deletions

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.git
.gitignore
.env
*.md
docs/

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PORT=8080
SERVICE_NAME=switchbot-api
ENV=local
LOG_LEVEL=info
OTEL_EXPORTER_OTLP_ENDPOINT=localhost:4317

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.env

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# syntax=docker/dockerfile:1
FROM golang:1.25-alpine AS builder
WORKDIR /src
COPY go.mod go.sum ./
RUN go mod download
COPY . .
RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -trimpath -ldflags='-s -w' -o /out/server ./cmd/server
FROM gcr.io/distroless/static-debian12:nonroot
WORKDIR /
COPY --from=builder /out/server /server
EXPOSE 8080
USER nonroot:nonroot
ENTRYPOINT ["/server"]

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# switchbot-api service
Gin-based Go service with clean-ish layering, OpenTelemetry tracing (OTLP gRPC), Prometheus metrics, structured JSON logging, and graceful shutdown.
## Project structure
```text
cmd/server/main.go
internal/app/bootstrap
internal/app/config
internal/app/observability
internal/domain/hello
internal/domain/health
internal/transport/http
```
## Endpoints
- `GET /healthz` -> `200 {"status":"ok"}`
- `GET /readyz` -> `200 {"status":"ok"}`
- `GET /hello` -> `200 {"message":"hello world"}`
- `GET /metrics` -> Prometheus metrics
## Configuration (environment variables)
- `PORT` (default: `8080`)
- `SERVICE_NAME` (default: `switchbot-api`)
- `ENV` (default: `local`)
- `LOG_LEVEL` (default: `info`)
- `OTEL_EXPORTER_OTLP_ENDPOINT` (default: empty; tracing export disabled)
### OTEL example env vars
```bash
export SERVICE_NAME=switchbot-api
export ENV=local
export OTEL_EXPORTER_OTLP_ENDPOINT=localhost:4317
```
## Run locally (without collector)
Tracing export is disabled by default when `OTEL_EXPORTER_OTLP_ENDPOINT` is not set.
```bash
go mod tidy
go run ./cmd/server
```
## Run with OpenTelemetry Collector (Docker Compose)
```bash
docker compose up --build
```
The collector prints received spans to stdout via the `logging` exporter.
## Example requests
```bash
curl -i http://localhost:8080/healthz
curl -i http://localhost:8080/readyz
curl -i http://localhost:8080/hello
curl -s http://localhost:8080/metrics | head
```
## Notes
- Request ID is propagated using `X-Request-Id` (generated if missing).
- Request logs include `request_id`, `trace_id`, and `span_id`.
- Error responses include `trace_id` and `request_id` when available.
- `/readyz` already has a usecase and checker abstraction with a TODO for future dependency checks.
- Optional tracing backend (Jaeger/Tempo) is not required for this setup.
## Verify
```bash
go test ./...
go vet ./...
```

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package main
import (
"context"
"errors"
"fmt"
"log/slog"
"net/http"
"os"
"os/signal"
"syscall"
"time"
"switchbot-api/internal/app/bootstrap"
"switchbot-api/internal/app/config"
)
func main() {
if err := run(); err != nil {
fmt.Fprintf(os.Stderr, "fatal: %v\n", err)
os.Exit(1)
}
}
func run() error {
cfg := config.Load()
ctx := context.Background()
app, err := bootstrap.New(ctx, cfg)
if err != nil {
return err
}
errCh := make(chan error, 1)
go func() {
errCh <- app.Start()
}()
sigCtx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
defer stop()
select {
case <-sigCtx.Done():
app.Logger.Info("shutdown signal received")
case err := <-errCh:
if err != nil && !errors.Is(err, http.ErrServerClosed) {
return err
}
}
shutdownCtx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
if err := app.Shutdown(shutdownCtx); err != nil {
app.Logger.Error("shutdown failed", slog.String("error", err.Error()))
return err
}
app.Logger.Info("server stopped cleanly")
return nil
}

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services:
app:
build:
context: .
dockerfile: Dockerfile
environment:
PORT: "8080"
SERVICE_NAME: "switchbot-api"
ENV: "local"
LOG_LEVEL: "info"
OTEL_EXPORTER_OTLP_ENDPOINT: "otel-collector:4317"
ports:
- "8080:8080"
depends_on:
- otel-collector
otel-collector:
image: otel/opentelemetry-collector:0.93.0
command: ["--config=/etc/otelcol/config.yaml"]
volumes:
- ./otel-collector-config.yaml:/etc/otelcol/config.yaml:ro
ports:
- "4317:4317"

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module switchbot-api
go 1.25
require (
github.com/gin-gonic/gin v1.11.0
github.com/google/uuid v1.6.0
github.com/prometheus/client_golang v1.23.2
go.opentelemetry.io/otel v1.38.0
go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.38.0
go.opentelemetry.io/otel/sdk v1.38.0
go.opentelemetry.io/otel/trace v1.38.0
)
require (
github.com/beorn7/perks v1.0.1 // indirect
github.com/bytedance/sonic v1.14.0 // indirect
github.com/bytedance/sonic/loader v0.3.0 // indirect
github.com/cenkalti/backoff/v5 v5.0.3 // indirect
github.com/cespare/xxhash/v2 v2.3.0 // indirect
github.com/cloudwego/base64x v0.1.6 // indirect
github.com/gabriel-vasile/mimetype v1.4.8 // indirect
github.com/gin-contrib/sse v1.1.0 // indirect
github.com/go-logr/logr v1.4.3 // indirect
github.com/go-logr/stdr v1.2.2 // indirect
github.com/go-playground/locales v0.14.1 // indirect
github.com/go-playground/universal-translator v0.18.1 // indirect
github.com/go-playground/validator/v10 v10.27.0 // indirect
github.com/goccy/go-json v0.10.2 // indirect
github.com/goccy/go-yaml v1.18.0 // indirect
github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.2 // indirect
github.com/json-iterator/go v1.1.12 // indirect
github.com/klauspost/cpuid/v2 v2.3.0 // indirect
github.com/leodido/go-urn v1.4.0 // indirect
github.com/mattn/go-isatty v0.0.20 // indirect
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
github.com/modern-go/reflect2 v1.0.2 // indirect
github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
github.com/pelletier/go-toml/v2 v2.2.4 // indirect
github.com/prometheus/client_model v0.6.2 // indirect
github.com/prometheus/common v0.66.1 // indirect
github.com/prometheus/procfs v0.16.1 // indirect
github.com/quic-go/qpack v0.5.1 // indirect
github.com/quic-go/quic-go v0.54.0 // indirect
github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
github.com/ugorji/go/codec v1.3.0 // indirect
go.opentelemetry.io/auto/sdk v1.1.0 // indirect
go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.38.0 // indirect
go.opentelemetry.io/otel/metric v1.38.0 // indirect
go.opentelemetry.io/proto/otlp v1.7.1 // indirect
go.uber.org/mock v0.5.0 // indirect
go.yaml.in/yaml/v2 v2.4.2 // indirect
golang.org/x/arch v0.20.0 // indirect
golang.org/x/crypto v0.41.0 // indirect
golang.org/x/mod v0.26.0 // indirect
golang.org/x/net v0.43.0 // indirect
golang.org/x/sync v0.16.0 // indirect
golang.org/x/sys v0.35.0 // indirect
golang.org/x/text v0.28.0 // indirect
golang.org/x/tools v0.35.0 // indirect
google.golang.org/genproto/googleapis/api v0.0.0-20250825161204-c5933d9347a5 // indirect
google.golang.org/genproto/googleapis/rpc v0.0.0-20250825161204-c5933d9347a5 // indirect
google.golang.org/grpc v1.75.0 // indirect
google.golang.org/protobuf v1.36.9 // indirect
)

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github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
github.com/bytedance/sonic v1.14.0 h1:/OfKt8HFw0kh2rj8N0F6C/qPGRESq0BbaNZgcNXXzQQ=
github.com/bytedance/sonic v1.14.0/go.mod h1:WoEbx8WTcFJfzCe0hbmyTGrfjt8PzNEBdxlNUO24NhA=
github.com/bytedance/sonic/loader v0.3.0 h1:dskwH8edlzNMctoruo8FPTJDF3vLtDT0sXZwvZJyqeA=
github.com/bytedance/sonic/loader v0.3.0/go.mod h1:N8A3vUdtUebEY2/VQC0MyhYeKUFosQU6FxH2JmUe6VI=
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/cloudwego/base64x v0.1.6 h1:t11wG9AECkCDk5fMSoxmufanudBtJ+/HemLstXDLI2M=
github.com/cloudwego/base64x v0.1.6/go.mod h1:OFcloc187FXDaYHvrNIjxSe8ncn0OOM8gEHfghB2IPU=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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/gabriel-vasile/mimetype v1.4.8 h1:FfZ3gj38NjllZIeJAmMhr+qKL8Wu+nOoI3GqacKw1NM=
github.com/gabriel-vasile/mimetype v1.4.8/go.mod h1:ByKUIKGjh1ODkGM1asKUbQZOLGrPjydw3hYPU2YU9t8=
github.com/gin-contrib/sse v1.1.0 h1:n0w2GMuUpWDVp7qSpvze6fAu9iRxJY4Hmj6AmBOU05w=
github.com/gin-contrib/sse v1.1.0/go.mod h1:hxRZ5gVpWMT7Z0B0gSNYqqsSCNIJMjzvm6fqCz9vjwM=
github.com/gin-gonic/gin v1.11.0 h1:OW/6PLjyusp2PPXtyxKHU0RbX6I/l28FTdDlae5ueWk=
github.com/gin-gonic/gin v1.11.0/go.mod h1:+iq/FyxlGzII0KHiBGjuNn4UNENUlKbGlNmc+W50Dls=
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/go-playground/assert/v2 v2.2.0 h1:JvknZsQTYeFEAhQwI4qEt9cyV5ONwRHC+lYKSsYSR8s=
github.com/go-playground/assert/v2 v2.2.0/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
github.com/go-playground/locales v0.14.1 h1:EWaQ/wswjilfKLTECiXz7Rh+3BjFhfDFKv/oXslEjJA=
github.com/go-playground/locales v0.14.1/go.mod h1:hxrqLVvrK65+Rwrd5Fc6F2O76J/NuW9t0sjnWqG1slY=
github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJnYK9S473LQFuzCbDbfSFY=
github.com/go-playground/universal-translator v0.18.1/go.mod h1:xekY+UJKNuX9WP91TpwSH2VMlDf28Uj24BCp08ZFTUY=
github.com/go-playground/validator/v10 v10.27.0 h1:w8+XrWVMhGkxOaaowyKH35gFydVHOvC0/uWoy2Fzwn4=
github.com/go-playground/validator/v10 v10.27.0/go.mod h1:I5QpIEbmr8On7W0TktmJAumgzX4CA1XNl4ZmDuVHKKo=
github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
github.com/goccy/go-yaml v1.18.0 h1:8W7wMFS12Pcas7KU+VVkaiCng+kG8QiFeFwzFb+rwuw=
github.com/goccy/go-yaml v1.18.0/go.mod h1:XBurs7gK8ATbW4ZPGKgcbrY1Br56PdM69F7LkFRi1kA=
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/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
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=
github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.2 h1:8Tjv8EJ+pM1xP8mK6egEbD1OgnVTyacbefKhmbLhIhU=
github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.2/go.mod h1:pkJQ2tZHJ0aFOVEEot6oZmaVEZcRme73eIFmhiVuRWs=
github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnrnM=
github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
github.com/klauspost/compress v1.18.0 h1:c/Cqfb0r+Yi+JtIEq73FWXVkRonBlf0CRNYc8Zttxdo=
github.com/klauspost/compress v1.18.0/go.mod h1:2Pp+KzxcywXVXMr50+X0Q/Lsb43OQHYWRCY2AiWywWQ=
github.com/klauspost/cpuid/v2 v2.3.0 h1:S4CRMLnYUhGeDFDqkGriYKdfoFlDnMtqTiI/sFzhA9Y=
github.com/klauspost/cpuid/v2 v2.3.0/go.mod h1:hqwkgyIinND0mEev00jJYCxPNVRVXFQeu1XKlok6oO0=
github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
github.com/leodido/go-urn v1.4.0 h1:WT9HwE9SGECu3lg4d/dIA+jxlljEa1/ffXKmRjqdmIQ=
github.com/leodido/go-urn v1.4.0/go.mod h1:bvxc+MVxLKB4z00jd1z+Dvzr47oO32F/QSNjSBOlFxI=
github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
github.com/modern-go/reflect2 v1.0.2 h1:xBagoLtFs94CBntxluKeaWgTMpvLxC4ur3nMaC9Gz0M=
github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk=
github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
github.com/pelletier/go-toml/v2 v2.2.4 h1:mye9XuhQ6gvn5h28+VilKrrPoQVanw5PMw/TB0t5Ec4=
github.com/pelletier/go-toml/v2 v2.2.4/go.mod h1:2gIqNv+qfxSVS7cM2xJQKtLSTLUE9V8t9Stt+h56mCY=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/prometheus/client_golang v1.23.2 h1:Je96obch5RDVy3FDMndoUsjAhG5Edi49h0RJWRi/o0o=
github.com/prometheus/client_golang v1.23.2/go.mod h1:Tb1a6LWHB3/SPIzCoaDXI4I8UHKeFTEQ1YCr+0Gyqmg=
github.com/prometheus/client_model v0.6.2 h1:oBsgwpGs7iVziMvrGhE53c/GrLUsZdHnqNwqPLxwZyk=
github.com/prometheus/client_model v0.6.2/go.mod h1:y3m2F6Gdpfy6Ut/GBsUqTWZqCUvMVzSfMLjcu6wAwpE=
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github.com/prometheus/common v0.66.1/go.mod h1:gcaUsgf3KfRSwHY4dIMXLPV0K/Wg1oZ8+SbZk/HH/dA=
github.com/prometheus/procfs v0.16.1 h1:hZ15bTNuirocR6u0JZ6BAHHmwS1p8B4P6MRqxtzMyRg=
github.com/prometheus/procfs v0.16.1/go.mod h1:teAbpZRB1iIAJYREa1LsoWUXykVXA1KlTmWl8x/U+Is=
github.com/quic-go/qpack v0.5.1 h1:giqksBPnT/HDtZ6VhtFKgoLOWmlyo9Ei6u9PqzIMbhI=
github.com/quic-go/qpack v0.5.1/go.mod h1:+PC4XFrEskIVkcLzpEkbLqq1uCoxPhQuvK5rH1ZgaEg=
github.com/quic-go/quic-go v0.54.0 h1:6s1YB9QotYI6Ospeiguknbp2Znb/jZYjZLRXn9kMQBg=
github.com/quic-go/quic-go v0.54.0/go.mod h1:e68ZEaCdyviluZmy44P6Iey98v/Wfz6HCjQEm+l8zTY=
github.com/rogpeppe/go-internal v1.13.1 h1:KvO1DLK/DRN07sQ1LQKScxyZJuNnedQ5/wKSR38lUII=
github.com/rogpeppe/go-internal v1.13.1/go.mod h1:uMEvuHeurkdAXX61udpOXGD/AzZDWNMNyH2VO9fmH0o=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
github.com/twitchyliquid64/golang-asm v0.15.1 h1:SU5vSMR7hnwNxj24w34ZyCi/FmDZTkS4MhqMhdFk5YI=
github.com/twitchyliquid64/golang-asm v0.15.1/go.mod h1:a1lVb/DtPvCB8fslRZhAngC2+aY1QWCk3Cedj/Gdt08=
github.com/ugorji/go/codec v1.3.0 h1:Qd2W2sQawAfG8XSvzwhBeoGq71zXOC/Q1E9y/wUcsUA=
github.com/ugorji/go/codec v1.3.0/go.mod h1:pRBVtBSKl77K30Bv8R2P+cLSGaTtex6fsA2Wjqmfxj4=
go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=
go.opentelemetry.io/auto/sdk v1.1.0/go.mod h1:3wSPjt5PWp2RhlCcmmOial7AvC4DQqZb7a7wCow3W8A=
go.opentelemetry.io/otel v1.38.0 h1:RkfdswUDRimDg0m2Az18RKOsnI8UDzppJAtj01/Ymk8=
go.opentelemetry.io/otel v1.38.0/go.mod h1:zcmtmQ1+YmQM9wrNsTGV/q/uyusom3P8RxwExxkZhjM=
go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.38.0 h1:GqRJVj7UmLjCVyVJ3ZFLdPRmhDUp2zFmQe3RHIOsw24=
go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.38.0/go.mod h1:ri3aaHSmCTVYu2AWv44YMauwAQc0aqI9gHKIcSbI1pU=
go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.38.0 h1:lwI4Dc5leUqENgGuQImwLo4WnuXFPetmPpkLi2IrX54=
go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.38.0/go.mod h1:Kz/oCE7z5wuyhPxsXDuaPteSWqjSBD5YaSdbxZYGbGk=
go.opentelemetry.io/otel/metric v1.38.0 h1:Kl6lzIYGAh5M159u9NgiRkmoMKjvbsKtYRwgfrA6WpA=
go.opentelemetry.io/otel/metric v1.38.0/go.mod h1:kB5n/QoRM8YwmUahxvI3bO34eVtQf2i4utNVLr9gEmI=
go.opentelemetry.io/otel/sdk v1.38.0 h1:l48sr5YbNf2hpCUj/FoGhW9yDkl+Ma+LrVl8qaM5b+E=
go.opentelemetry.io/otel/sdk v1.38.0/go.mod h1:ghmNdGlVemJI3+ZB5iDEuk4bWA3GkTpW+DOoZMYBVVg=
go.opentelemetry.io/otel/sdk/metric v1.38.0 h1:aSH66iL0aZqo//xXzQLYozmWrXxyFkBJ6qT5wthqPoM=
go.opentelemetry.io/otel/sdk/metric v1.38.0/go.mod h1:dg9PBnW9XdQ1Hd6ZnRz689CbtrUp0wMMs9iPcgT9EZA=
go.opentelemetry.io/otel/trace v1.38.0 h1:Fxk5bKrDZJUH+AMyyIXGcFAPah0oRcT+LuNtJrmcNLE=
go.opentelemetry.io/otel/trace v1.38.0/go.mod h1:j1P9ivuFsTceSWe1oY+EeW3sc+Pp42sO++GHkg4wwhs=
go.opentelemetry.io/proto/otlp v1.7.1 h1:gTOMpGDb0WTBOP8JaO72iL3auEZhVmAQg4ipjOVAtj4=
go.opentelemetry.io/proto/otlp v1.7.1/go.mod h1:b2rVh6rfI/s2pHWNlB7ILJcRALpcNDzKhACevjI+ZnE=
go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
go.uber.org/mock v0.5.0 h1:KAMbZvZPyBPWgD14IrIQ38QCyjwpvVVV6K/bHl1IwQU=
go.uber.org/mock v0.5.0/go.mod h1:ge71pBPLYDk7QIi1LupWxdAykm7KIEFchiOqd6z7qMM=
go.yaml.in/yaml/v2 v2.4.2 h1:DzmwEr2rDGHl7lsFgAHxmNz/1NlQ7xLIrlN2h5d1eGI=
go.yaml.in/yaml/v2 v2.4.2/go.mod h1:081UH+NErpNdqlCXm3TtEran0rJZGxAYx9hb/ELlsPU=
golang.org/x/arch v0.20.0 h1:dx1zTU0MAE98U+TQ8BLl7XsJbgze2WnNKF/8tGp/Q6c=
golang.org/x/arch v0.20.0/go.mod h1:bdwinDaKcfZUGpH09BB7ZmOfhalA8lQdzl62l8gGWsk=
golang.org/x/crypto v0.41.0 h1:WKYxWedPGCTVVl5+WHSSrOBT0O8lx32+zxmHxijgXp4=
golang.org/x/crypto v0.41.0/go.mod h1:pO5AFd7FA68rFak7rOAGVuygIISepHftHnr8dr6+sUc=
golang.org/x/mod v0.26.0 h1:EGMPT//Ezu+ylkCijjPc+f4Aih7sZvaAr+O3EHBxvZg=
golang.org/x/mod v0.26.0/go.mod h1:/j6NAhSk8iQ723BGAUyoAcn7SlD7s15Dp9Nd/SfeaFQ=
golang.org/x/net v0.43.0 h1:lat02VYK2j4aLzMzecihNvTlJNQUq316m2Mr9rnM6YE=
golang.org/x/net v0.43.0/go.mod h1:vhO1fvI4dGsIjh73sWfUVjj3N7CA9WkKJNQm2svM6Jg=
golang.org/x/sync v0.16.0 h1:ycBJEhp9p4vXvUZNszeOq0kGTPghopOL8q0fq3vstxw=
golang.org/x/sync v0.16.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.35.0 h1:vz1N37gP5bs89s7He8XuIYXpyY0+QlsKmzipCbUtyxI=
golang.org/x/sys v0.35.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
golang.org/x/text v0.28.0 h1:rhazDwis8INMIwQ4tpjLDzUhx6RlXqZNPEM0huQojng=
golang.org/x/text v0.28.0/go.mod h1:U8nCwOR8jO/marOQ0QbDiOngZVEBB7MAiitBuMjXiNU=
golang.org/x/tools v0.35.0 h1:mBffYraMEf7aa0sB+NuKnuCy8qI/9Bughn8dC2Gu5r0=
golang.org/x/tools v0.35.0/go.mod h1:NKdj5HkL/73byiZSJjqJgKn3ep7KjFkBOkR/Hps3VPw=
gonum.org/v1/gonum v0.16.0 h1:5+ul4Swaf3ESvrOnidPp4GZbzf0mxVQpDCYUQE7OJfk=
gonum.org/v1/gonum v0.16.0/go.mod h1:fef3am4MQ93R2HHpKnLk4/Tbh/s0+wqD5nfa6Pnwy4E=
google.golang.org/genproto/googleapis/api v0.0.0-20250825161204-c5933d9347a5 h1:BIRfGDEjiHRrk0QKZe3Xv2ieMhtgRGeLcZQ0mIVn4EY=
google.golang.org/genproto/googleapis/api v0.0.0-20250825161204-c5933d9347a5/go.mod h1:j3QtIyytwqGr1JUDtYXwtMXWPKsEa5LtzIFN1Wn5WvE=
google.golang.org/genproto/googleapis/rpc v0.0.0-20250825161204-c5933d9347a5 h1:eaY8u2EuxbRv7c3NiGK0/NedzVsCcV6hDuU5qPX5EGE=
google.golang.org/genproto/googleapis/rpc v0.0.0-20250825161204-c5933d9347a5/go.mod h1:M4/wBTSeyLxupu3W3tJtOgB14jILAS/XWPSSa3TAlJc=
google.golang.org/grpc v1.75.0 h1:+TW+dqTd2Biwe6KKfhE5JpiYIBWq865PhKGSXiivqt4=
google.golang.org/grpc v1.75.0/go.mod h1:JtPAzKiq4v1xcAB2hydNlWI2RnF85XXcV0mhKXr2ecQ=
google.golang.org/protobuf v1.36.9 h1:w2gp2mA27hUeUzj9Ex9FBjsBm40zfaDtEWow293U7Iw=
google.golang.org/protobuf v1.36.9/go.mod h1:fuxRtAxBytpl4zzqUh6/eyUujkJdNiuEkXntxiD/uRU=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

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@ -0,0 +1,109 @@
package bootstrap
import (
"context"
"errors"
"fmt"
"log/slog"
"net/http"
"strings"
"time"
"github.com/gin-gonic/gin"
"switchbot-api/internal/app/config"
"switchbot-api/internal/app/observability"
"switchbot-api/internal/domain/health"
"switchbot-api/internal/domain/hello"
httptransport "switchbot-api/internal/transport/http"
"switchbot-api/internal/transport/http/handlers"
)
type App struct {
Config config.Config
Logger *slog.Logger
Server *http.Server
tracerShutdown func(ctx context.Context) error
}
func New(ctx context.Context, cfg config.Config) (*App, error) {
logger, err := observability.NewLogger(cfg.LogLevel)
if err != nil {
return nil, err
}
setGinMode(cfg.Environment)
tp, err := observability.NewTracerProvider(ctx, logger, cfg.ServiceName, cfg.Environment, cfg.OTLPEndpoint)
if err != nil {
return nil, fmt.Errorf("initialize tracing: %w", err)
}
tracer := observability.NewTracer(tp, cfg.ServiceName)
promRegistry := observability.NewRegistry()
httpMetrics := observability.NewHTTPMetrics(promRegistry)
promHandler := observability.NewPrometheusHandler(promRegistry)
helloUsecase := hello.NewService()
readinessUsecase := health.NewReadinessUsecase(nil)
healthHandler := handlers.NewHealthHandler(readinessUsecase)
helloHandler := handlers.NewHelloHandler(helloUsecase)
router := httptransport.NewRouter(httptransport.Dependencies{
Logger: logger,
Tracer: tracer,
HTTPMetrics: httpMetrics,
PrometheusHandler: promHandler,
HealthHandler: healthHandler,
HelloHandler: helloHandler,
})
server := &http.Server{
Addr: cfg.Addr(),
Handler: router,
ReadHeaderTimeout: 5 * time.Second,
ReadTimeout: 15 * time.Second,
WriteTimeout: 30 * time.Second,
IdleTimeout: 60 * time.Second,
}
return &App{
Config: cfg,
Logger: logger,
Server: server,
tracerShutdown: func(ctx context.Context) error {
return tp.Shutdown(ctx)
},
}, nil
}
func (a *App) Start() error {
a.Logger.Info("http server starting", slog.String("addr", a.Server.Addr), slog.String("service", a.Config.ServiceName), slog.String("env", a.Config.Environment))
if err := a.Server.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
return err
}
return nil
}
func (a *App) Shutdown(ctx context.Context) error {
var errs []error
if err := a.Server.Shutdown(ctx); err != nil {
errs = append(errs, fmt.Errorf("shutdown http server: %w", err))
}
if err := a.tracerShutdown(ctx); err != nil {
errs = append(errs, fmt.Errorf("shutdown tracer provider: %w", err))
}
return errors.Join(errs...)
}
func setGinMode(environment string) {
switch strings.ToLower(strings.TrimSpace(environment)) {
case "local", "dev", "development", "test":
gin.SetMode(gin.DebugMode)
default:
gin.SetMode(gin.ReleaseMode)
}
}

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@ -0,0 +1,43 @@
package config
import (
"fmt"
"os"
"strings"
)
// Config contains all runtime settings sourced from environment variables.
type Config struct {
Port string
ServiceName string
Environment string
LogLevel string
OTLPEndpoint string
}
func Load() Config {
return Config{
Port: getEnv("PORT", "8080"),
ServiceName: getEnv("SERVICE_NAME", "switchbot-api"),
Environment: getEnv("ENV", "local"),
LogLevel: getEnv("LOG_LEVEL", "info"),
OTLPEndpoint: strings.TrimSpace(os.Getenv("OTEL_EXPORTER_OTLP_ENDPOINT")),
}
}
func (c Config) Addr() string {
if strings.HasPrefix(c.Port, ":") {
return c.Port
}
return fmt.Sprintf(":%s", c.Port)
}
func getEnv(key, fallback string) string {
if value, ok := os.LookupEnv(key); ok {
trimmed := strings.TrimSpace(value)
if trimmed != "" {
return trimmed
}
}
return fallback
}

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@ -0,0 +1,33 @@
package observability
import (
"fmt"
"log/slog"
"os"
"strings"
)
func NewLogger(level string) (*slog.Logger, error) {
parsed, err := parseLevel(level)
if err != nil {
return nil, err
}
handler := slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: parsed})
return slog.New(handler), nil
}
func parseLevel(level string) (slog.Level, error) {
switch strings.ToLower(strings.TrimSpace(level)) {
case "debug":
return slog.LevelDebug, nil
case "info", "":
return slog.LevelInfo, nil
case "warn", "warning":
return slog.LevelWarn, nil
case "error":
return slog.LevelError, nil
default:
return slog.LevelInfo, fmt.Errorf("unsupported LOG_LEVEL: %s", level)
}
}

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@ -0,0 +1,58 @@
package observability
import (
"net/http"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/collectors"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
// HTTPMetrics contains metric collectors used by HTTP middleware.
type HTTPMetrics struct {
RequestsTotal *prometheus.CounterVec
RequestDuration *prometheus.HistogramVec
InFlight prometheus.Gauge
}
func NewRegistry() *prometheus.Registry {
registry := prometheus.NewRegistry()
registry.MustRegister(
collectors.NewGoCollector(),
collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
)
return registry
}
func NewHTTPMetrics(registerer prometheus.Registerer) *HTTPMetrics {
factory := promauto.With(registerer)
return &HTTPMetrics{
RequestsTotal: factory.NewCounterVec(
prometheus.CounterOpts{
Name: "http_requests_total",
Help: "Total number of HTTP requests by method, route, and status.",
},
[]string{"method", "route", "status"},
),
RequestDuration: factory.NewHistogramVec(
prometheus.HistogramOpts{
Name: "http_request_duration_seconds",
Help: "HTTP request duration by method, route, and status.",
Buckets: prometheus.DefBuckets,
},
[]string{"method", "route", "status"},
),
InFlight: factory.NewGauge(
prometheus.GaugeOpts{
Name: "http_in_flight_requests",
Help: "Current number of in-flight HTTP requests.",
},
),
}
}
func NewPrometheusHandler(registry *prometheus.Registry) http.Handler {
return promhttp.HandlerFor(registry, promhttp.HandlerOpts{})
}

View File

@ -0,0 +1,59 @@
package observability
import (
"context"
"log/slog"
"strings"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.37.0"
"go.opentelemetry.io/otel/trace"
)
func NewTracerProvider(ctx context.Context, logger *slog.Logger, serviceName, environment, otlpEndpoint string) (*sdktrace.TracerProvider, error) {
res, err := resource.New(
ctx,
resource.WithAttributes(
semconv.ServiceName(serviceName),
semconv.DeploymentEnvironmentName(environment),
),
)
if err != nil {
return nil, err
}
providerOptions := []sdktrace.TracerProviderOption{sdktrace.WithResource(res)}
endpoint := strings.TrimSpace(otlpEndpoint)
if endpoint != "" {
exporter, err := otlptracegrpc.New(
ctx,
otlptracegrpc.WithEndpoint(endpoint),
otlptracegrpc.WithInsecure(),
)
if err != nil {
return nil, err
}
providerOptions = append(providerOptions, sdktrace.WithBatcher(exporter))
logger.Info("otlp tracing exporter enabled", slog.String("endpoint", endpoint))
} else {
logger.Info("otlp endpoint not set, traces will not be exported")
}
tp := sdktrace.NewTracerProvider(providerOptions...)
otel.SetTracerProvider(tp)
otel.SetTextMapPropagator(
propagation.NewCompositeTextMapPropagator(
propagation.TraceContext{},
propagation.Baggage{},
),
)
return tp, nil
}
func NewTracer(tp *sdktrace.TracerProvider, serviceName string) trace.Tracer {
return tp.Tracer(serviceName)
}

View File

@ -0,0 +1,31 @@
package health
import (
"context"
"fmt"
)
// Checker allows plugging external dependency checks into readiness.
type Checker interface {
Name() string
Check(ctx context.Context) error
}
// ReadinessUsecase executes dependency checks used by /readyz.
type ReadinessUsecase struct {
checkers []Checker
}
func NewReadinessUsecase(checkers []Checker) *ReadinessUsecase {
return &ReadinessUsecase{checkers: checkers}
}
func (u *ReadinessUsecase) Check(ctx context.Context) error {
// TODO: add concrete dependency checkers (DB, cache, third-party APIs) as needed.
for _, checker := range u.checkers {
if err := checker.Check(ctx); err != nil {
return fmt.Errorf("%s check failed: %w", checker.Name(), err)
}
}
return nil
}

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@ -0,0 +1,18 @@
package hello
import "context"
// Usecase defines hello business behavior.
type Usecase interface {
Message(ctx context.Context) string
}
type Service struct{}
func NewService() *Service {
return &Service{}
}
func (s *Service) Message(context.Context) string {
return "hello world"
}

View File

@ -0,0 +1,14 @@
package contextkeys
import "context"
type requestIDContextKey struct{}
func WithRequestID(ctx context.Context, requestID string) context.Context {
return context.WithValue(ctx, requestIDContextKey{}, requestID)
}
func RequestIDFromContext(ctx context.Context) string {
requestID, _ := ctx.Value(requestIDContextKey{}).(string)
return requestID
}

View File

@ -0,0 +1,34 @@
package handlers
import (
"context"
"net/http"
"github.com/gin-gonic/gin"
"switchbot-api/internal/transport/http/response"
)
type ReadinessUsecase interface {
Check(ctx context.Context) error
}
type HealthHandler struct {
readiness ReadinessUsecase
}
func NewHealthHandler(readiness ReadinessUsecase) *HealthHandler {
return &HealthHandler{readiness: readiness}
}
func (h *HealthHandler) Healthz(c *gin.Context) {
c.JSON(http.StatusOK, gin.H{"status": "ok"})
}
func (h *HealthHandler) Readyz(c *gin.Context) {
if err := h.readiness.Check(c.Request.Context()); err != nil {
response.WriteError(c, http.StatusServiceUnavailable, "service not ready")
return
}
c.JSON(http.StatusOK, gin.H{"status": "ok"})
}

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@ -0,0 +1,25 @@
package handlers
import (
"context"
"net/http"
"github.com/gin-gonic/gin"
)
type HelloUsecase interface {
Message(ctx context.Context) string
}
type HelloHandler struct {
helloUsecase HelloUsecase
}
func NewHelloHandler(helloUsecase HelloUsecase) *HelloHandler {
return &HelloHandler{helloUsecase: helloUsecase}
}
func (h *HelloHandler) Hello(c *gin.Context) {
message := h.helloUsecase.Message(c.Request.Context())
c.JSON(http.StatusOK, gin.H{"message": message})
}

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@ -0,0 +1,43 @@
package middleware
import (
"log/slog"
"time"
"github.com/gin-gonic/gin"
"go.opentelemetry.io/otel/trace"
"switchbot-api/internal/transport/http/contextkeys"
)
func AccessLog(logger *slog.Logger) gin.HandlerFunc {
return func(c *gin.Context) {
start := time.Now()
c.Next()
route := c.FullPath()
if route == "" {
route = "/unknown"
}
spanCtx := trace.SpanContextFromContext(c.Request.Context())
traceID := ""
spanID := ""
if spanCtx.IsValid() {
traceID = spanCtx.TraceID().String()
spanID = spanCtx.SpanID().String()
}
logger.Info(
"http_request",
slog.String("method", c.Request.Method),
slog.String("path", c.Request.URL.Path),
slog.String("route", route),
slog.Int("status", c.Writer.Status()),
slog.Duration("duration", time.Since(start)),
slog.String("request_id", contextkeys.RequestIDFromContext(c.Request.Context())),
slog.String("trace_id", traceID),
slog.String("span_id", spanID),
)
}
}

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package middleware
import (
"strconv"
"time"
"github.com/gin-gonic/gin"
"switchbot-api/internal/app/observability"
)
func Metrics(httpMetrics *observability.HTTPMetrics) gin.HandlerFunc {
return func(c *gin.Context) {
start := time.Now()
httpMetrics.InFlight.Inc()
defer httpMetrics.InFlight.Dec()
c.Next()
route := c.FullPath()
if route == "" {
route = "/unknown"
}
status := strconv.Itoa(c.Writer.Status())
httpMetrics.RequestsTotal.WithLabelValues(c.Request.Method, route, status).Inc()
httpMetrics.RequestDuration.WithLabelValues(c.Request.Method, route, status).Observe(time.Since(start).Seconds())
}
}

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package middleware
import (
"fmt"
"io"
"log/slog"
"runtime/debug"
"github.com/gin-gonic/gin"
"go.opentelemetry.io/otel/codes"
"go.opentelemetry.io/otel/trace"
"switchbot-api/internal/transport/http/contextkeys"
"switchbot-api/internal/transport/http/response"
)
func Recovery(logger *slog.Logger) gin.HandlerFunc {
return gin.CustomRecoveryWithWriter(io.Discard, func(c *gin.Context, recovered any) {
ctx := c.Request.Context()
span := trace.SpanFromContext(ctx)
span.RecordError(fmt.Errorf("panic: %v", recovered))
span.SetStatus(codes.Error, "panic recovered")
spanCtx := trace.SpanContextFromContext(ctx)
traceID := ""
spanID := ""
if spanCtx.IsValid() {
traceID = spanCtx.TraceID().String()
spanID = spanCtx.SpanID().String()
}
logger.Error(
"panic recovered",
slog.Any("panic", recovered),
slog.String("request_id", contextkeys.RequestIDFromContext(ctx)),
slog.String("trace_id", traceID),
slog.String("span_id", spanID),
slog.String("stack", string(debug.Stack())),
)
response.WriteInternalError(c)
c.Abort()
})
}

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package middleware
import (
"strings"
"github.com/gin-gonic/gin"
"github.com/google/uuid"
"switchbot-api/internal/transport/http/contextkeys"
)
const RequestIDHeader = "X-Request-Id"
func RequestID() gin.HandlerFunc {
return func(c *gin.Context) {
requestID := strings.TrimSpace(c.GetHeader(RequestIDHeader))
if requestID == "" {
requestID = uuid.NewString()
}
ctx := contextkeys.WithRequestID(c.Request.Context(), requestID)
c.Request = c.Request.WithContext(ctx)
c.Writer.Header().Set(RequestIDHeader, requestID)
c.Next()
}
}

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package middleware
import (
"fmt"
"net/http"
"github.com/gin-gonic/gin"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/codes"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/trace"
)
func Tracing(tracer trace.Tracer) gin.HandlerFunc {
return func(c *gin.Context) {
ctx := otel.GetTextMapPropagator().Extract(c.Request.Context(), propagation.HeaderCarrier(c.Request.Header))
spanName := fmt.Sprintf("%s %s", c.Request.Method, c.Request.URL.Path)
ctx, span := tracer.Start(
ctx,
spanName,
trace.WithSpanKind(trace.SpanKindServer),
trace.WithAttributes(
attribute.String("http.request.method", c.Request.Method),
),
)
defer span.End()
c.Request = c.Request.WithContext(ctx)
c.Next()
route := c.FullPath()
if route == "" {
route = "/unknown"
}
status := c.Writer.Status()
span.SetName(fmt.Sprintf("%s %s", c.Request.Method, route))
span.SetAttributes(
attribute.String("http.route", route),
attribute.Int("http.response.status_code", status),
)
if status >= http.StatusInternalServerError {
span.SetStatus(codes.Error, http.StatusText(status))
}
if len(c.Errors) > 0 {
for _, err := range c.Errors {
span.RecordError(err)
}
span.SetStatus(codes.Error, c.Errors.String())
}
}
}

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package response
import (
"net/http"
"github.com/gin-gonic/gin"
"go.opentelemetry.io/otel/trace"
"switchbot-api/internal/transport/http/contextkeys"
)
type ErrorBody struct {
Error string `json:"error"`
TraceID string `json:"trace_id,omitempty"`
RequestID string `json:"request_id,omitempty"`
}
func WriteError(c *gin.Context, status int, message string) {
spanCtx := trace.SpanContextFromContext(c.Request.Context())
body := ErrorBody{Error: message}
if spanCtx.IsValid() {
body.TraceID = spanCtx.TraceID().String()
}
if requestID := contextkeys.RequestIDFromContext(c.Request.Context()); requestID != "" {
body.RequestID = requestID
}
c.JSON(status, body)
}
func WriteInternalError(c *gin.Context) {
WriteError(c, http.StatusInternalServerError, "internal server error")
}

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package httptransport
import (
"log/slog"
"net/http"
"github.com/gin-gonic/gin"
"go.opentelemetry.io/otel/trace"
"switchbot-api/internal/app/observability"
"switchbot-api/internal/transport/http/handlers"
"switchbot-api/internal/transport/http/middleware"
)
type Dependencies struct {
Logger *slog.Logger
Tracer trace.Tracer
HTTPMetrics *observability.HTTPMetrics
PrometheusHandler http.Handler
HealthHandler *handlers.HealthHandler
HelloHandler *handlers.HelloHandler
}
func NewRouter(deps Dependencies) *gin.Engine {
router := gin.New()
router.RedirectTrailingSlash = false
router.Use(middleware.RequestID())
router.Use(middleware.Tracing(deps.Tracer))
router.Use(middleware.Metrics(deps.HTTPMetrics))
router.Use(middleware.AccessLog(deps.Logger))
router.Use(middleware.Recovery(deps.Logger))
router.GET("/healthz", deps.HealthHandler.Healthz)
router.GET("/readyz", deps.HealthHandler.Readyz)
router.GET("/hello", deps.HelloHandler.Hello)
router.GET("/metrics", gin.WrapH(deps.PrometheusHandler))
return router
}

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package httptransport_test
import (
"encoding/json"
"io"
"log/slog"
"net/http"
"net/http/httptest"
"testing"
"github.com/gin-gonic/gin"
"go.opentelemetry.io/otel/trace/noop"
"switchbot-api/internal/app/observability"
"switchbot-api/internal/domain/health"
"switchbot-api/internal/domain/hello"
httptransport "switchbot-api/internal/transport/http"
"switchbot-api/internal/transport/http/handlers"
)
func TestHealthz(t *testing.T) {
router := newTestRouter()
req := httptest.NewRequest(http.MethodGet, "/healthz", nil)
rec := httptest.NewRecorder()
router.ServeHTTP(rec, req)
if rec.Code != http.StatusOK {
t.Fatalf("expected status %d, got %d", http.StatusOK, rec.Code)
}
var body map[string]string
if err := json.Unmarshal(rec.Body.Bytes(), &body); err != nil {
t.Fatalf("failed to unmarshal response: %v", err)
}
if body["status"] != "ok" {
t.Fatalf("expected status=ok, got %q", body["status"])
}
}
func TestHello(t *testing.T) {
router := newTestRouter()
req := httptest.NewRequest(http.MethodGet, "/hello", nil)
rec := httptest.NewRecorder()
router.ServeHTTP(rec, req)
if rec.Code != http.StatusOK {
t.Fatalf("expected status %d, got %d", http.StatusOK, rec.Code)
}
var body map[string]string
if err := json.Unmarshal(rec.Body.Bytes(), &body); err != nil {
t.Fatalf("failed to unmarshal response: %v", err)
}
if body["message"] != "hello world" {
t.Fatalf("expected message=hello world, got %q", body["message"])
}
}
func newTestRouter() *gin.Engine {
gin.SetMode(gin.TestMode)
logger := slog.New(slog.NewJSONHandler(io.Discard, nil))
registry := observability.NewRegistry()
httpMetrics := observability.NewHTTPMetrics(registry)
healthHandler := handlers.NewHealthHandler(health.NewReadinessUsecase(nil))
helloHandler := handlers.NewHelloHandler(hello.NewService())
return httptransport.NewRouter(httptransport.Dependencies{
Logger: logger,
Tracer: noop.NewTracerProvider().Tracer("test"),
HTTPMetrics: httpMetrics,
PrometheusHandler: observability.NewPrometheusHandler(registry),
HealthHandler: healthHandler,
HelloHandler: helloHandler,
})
}

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receivers:
otlp:
protocols:
grpc:
processors:
batch:
exporters:
logging:
loglevel: debug
service:
pipelines:
traces:
receivers: [otlp]
processors: [batch]
exporters: [logging]