feat: add demo-app api service
실험·앱 계층 설계서 3.1의 demo-app api(컨테이너 계층). /healthz, /readyz(DB ping +
legacy /healthz), /api/orders GET/POST(app.orders), /api/price/{item}(legacy-api via ILB,
LEGACY_TIMEOUT 기본 2s), /metrics(demo_http_*). OTLP 트레이스는 OTEL_EXPORTER_OTLP_ENDPOINT
설정 시 전송(otelhttp). 이미지는 공개 Artifact Registry selfheal-public(노드 익명 pull).
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@@ -0,0 +1,15 @@
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# demo-app api (Kubernetes layer of the self-healing lab). Built with Cloud Build into the public Artifact Registry repo.
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FROM golang:1.27.1-alpine AS build
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WORKDIR /src
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ENV CGO_ENABLED=0 GOFLAGS=-mod=mod
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COPY go.mod go.sum ./
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RUN go mod download
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COPY . .
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RUN go build -trimpath -ldflags="-s -w" -o /out/demo-api .
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FROM alpine:3.22
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RUN apk add --no-cache ca-certificates && adduser -D -u 10001 app
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USER 10001
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COPY --from=build /out/demo-api /usr/local/bin/demo-api
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EXPOSE 8080
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ENTRYPOINT ["/usr/local/bin/demo-api"]
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@@ -0,0 +1,43 @@
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module github.com/selfheal-lab/selfheal-lab-apps/demo-app
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go 1.27
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require (
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github.com/jackc/pgx/v5 v5.11.0
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github.com/prometheus/client_golang v1.24.1
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go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.71.0
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go.opentelemetry.io/otel v1.46.0
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go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.46.0
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go.opentelemetry.io/otel/sdk v1.46.0
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)
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require (
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github.com/beorn7/perks v1.0.1 // indirect
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github.com/cenkalti/backoff/v5 v5.0.3 // indirect
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github.com/cespare/xxhash/v2 v2.3.0 // indirect
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github.com/felixge/httpsnoop v1.1.0 // indirect
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github.com/go-logr/logr v1.4.4 // indirect
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github.com/go-logr/stdr v1.2.2 // indirect
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github.com/google/uuid v1.6.0 // indirect
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github.com/grpc-ecosystem/grpc-gateway/v2 v2.30.0 // indirect
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github.com/jackc/pgpassfile v1.0.0 // indirect
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github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
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github.com/jackc/puddle/v2 v2.2.2 // indirect
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github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
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github.com/prometheus/client_model v0.6.2 // indirect
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github.com/prometheus/common v0.70.1 // indirect
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github.com/prometheus/procfs v0.21.1 // indirect
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go.opentelemetry.io/auto/sdk v1.2.1 // indirect
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go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.46.0 // indirect
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go.opentelemetry.io/otel/metric v1.46.0 // indirect
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go.opentelemetry.io/otel/trace v1.46.0 // indirect
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go.opentelemetry.io/proto/otlp v1.11.0 // indirect
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golang.org/x/net v0.58.0 // indirect
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golang.org/x/sync v0.22.0 // indirect
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golang.org/x/sys v0.47.0 // indirect
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golang.org/x/text v0.41.0 // indirect
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google.golang.org/genproto/googleapis/api v0.0.0-20260819154853-08b0e4226688 // indirect
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google.golang.org/genproto/googleapis/rpc v0.0.0-20260819154853-08b0e4226688 // indirect
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google.golang.org/grpc v1.83.1 // indirect
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google.golang.org/protobuf v1.36.12 // indirect
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)
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@@ -0,0 +1,96 @@
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github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
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github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
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github.com/cenkalti/backoff/v5 v5.0.3 h1:ZN+IMa753KfX5hd8vVaMixjnqRZ3y8CuJKRKj1xcsSM=
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github.com/cenkalti/backoff/v5 v5.0.3/go.mod h1:rkhZdG3JZukswDf7f0cwqPNk4K0sa+F97BxZthm/crw=
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github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
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github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
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github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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github.com/felixge/httpsnoop v1.1.0 h1:3YtUj32ZZkqZtt3sZZsClsymw/QDuVfpNhoA31zeORc=
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github.com/felixge/httpsnoop v1.1.0/go.mod h1:Zqxgdd+1Rkcz8euOqdr7lqgCRJztwr5hp9vDSi5UZCE=
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github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
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github.com/go-logr/logr v1.4.4 h1:tG4xh9yMsRCAiodLVTxyrkzSZ9+o0L1Kg/+cPVcbP/8=
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github.com/go-logr/logr v1.4.4/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
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github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
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github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
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github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
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github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
|
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github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
|
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github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
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github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
|
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github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
|
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github.com/grpc-ecosystem/grpc-gateway/v2 v2.30.0 h1:/Tnpcb2E0Pz/tN9s3bfEY2Q8ePCEX9iuS+cneUwncnw=
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||||
github.com/grpc-ecosystem/grpc-gateway/v2 v2.30.0/go.mod h1:zOBXOsUaBSjKgmH4OGzV1esUpR3oUSCPYVd2cUBjKYY=
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github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
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||||
github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg=
|
||||
github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 h1:iCEnooe7UlwOQYpKFhBabPMi4aNAfoODPEFNiAnClxo=
|
||||
github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761/go.mod h1:5TJZWKEWniPve33vlWYSoGYefn3gLQRzjfDlhSJ9ZKM=
|
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github.com/jackc/pgx/v5 v5.11.0 h1:IzBBtyK9AHqf98cctWFifYSci2hgQR/cd56wB4p+ogg=
|
||||
github.com/jackc/pgx/v5 v5.11.0/go.mod h1:mal1tBGAFfLHvZzaYh77YS/eC6IX9OWbRV1QIIM0Jn4=
|
||||
github.com/jackc/puddle/v2 v2.2.2 h1:PR8nw+E/1w0GLuRFSmiioY6UooMp6KJv0/61nB7icHo=
|
||||
github.com/jackc/puddle/v2 v2.2.2/go.mod h1:vriiEXHvEE654aYKXXjOvZM39qJ0q+azkZFrfEOc3H4=
|
||||
github.com/klauspost/compress v1.19.1 h1:VsB4HPswih7mmZ8WleSFQ75c/Ui1M4trX5oAsJnhSlk=
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github.com/klauspost/compress v1.19.1/go.mod h1:cwPg85FWrGar70rWktvGQj8/hthj3wpl0PGDogxkrSQ=
|
||||
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/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
|
||||
github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
|
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github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
|
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github.com/prometheus/client_golang v1.24.1 h1:JnJkREXzWxUdCuPFpIWZiPispT9xVV59uiuyR2bPlnU=
|
||||
github.com/prometheus/client_golang v1.24.1/go.mod h1:F+oSRECHg4sse5ucfYpYDeIv/hu68Zo0uoHKetWnzcE=
|
||||
github.com/prometheus/client_model v0.6.2 h1:oBsgwpGs7iVziMvrGhE53c/GrLUsZdHnqNwqPLxwZyk=
|
||||
github.com/prometheus/client_model v0.6.2/go.mod h1:y3m2F6Gdpfy6Ut/GBsUqTWZqCUvMVzSfMLjcu6wAwpE=
|
||||
github.com/prometheus/common v0.70.1 h1:1HvjP4D5oL3t8RsPlwxA9onvvStjtIHYE5XuuwOi/PY=
|
||||
github.com/prometheus/common v0.70.1/go.mod h1:VdFUQDMZK3VLkurFUVhia6uys/0suUp86TJz5qbJRhc=
|
||||
github.com/prometheus/procfs v0.21.1 h1:GljZCt+zSTS+NZq88cyQ1LjZ+RCHp3uVuabBWA5+OJI=
|
||||
github.com/prometheus/procfs v0.21.1/go.mod h1:aB55Cww9pdSJVHk0hUf0inxWyyjPogFIjmHKYgMKmtY=
|
||||
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
|
||||
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
|
||||
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
|
||||
github.com/stretchr/testify v1.12.1 h1:EuwCh5fleGS7H32xRwO3wRGT7DxrDhLAT6FF8MpWDWE=
|
||||
github.com/stretchr/testify v1.12.1/go.mod h1:MDEgiDPPsNp5cuIrHPPCyornHKgEVbtFUmoNlxoYthg=
|
||||
go.opentelemetry.io/auto/sdk v1.2.1 h1:jXsnJ4Lmnqd11kwkBV2LgLoFMZKizbCi5fNZ/ipaZ64=
|
||||
go.opentelemetry.io/auto/sdk v1.2.1/go.mod h1:KRTj+aOaElaLi+wW1kO/DZRXwkF4C5xPbEe3ZiIhN7Y=
|
||||
go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.71.0 h1:3g7B90UzBltIDKq1/5mrTGxTnOFDV0ICOhLoxiZ8jlg=
|
||||
go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.71.0/go.mod h1:Ef8SuTh59BT7+ofpDxN9z+yOlc4t2GjLmKDgYNJL/NU=
|
||||
go.opentelemetry.io/otel v1.46.0 h1:FHt5/CDyVxi/8IM1CH7VE/rRgq3kLHa2mSTVMO8AWyc=
|
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go.opentelemetry.io/otel v1.46.0/go.mod h1:Gj3SEScelsNC45tp4nSxRYlS+f5iez7W8XPMCt905kE=
|
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go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.46.0 h1:OFnwLJr+pF3iHrlGSzbxyuo6/6HyBlnlN1CWEJmBVcw=
|
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go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.46.0/go.mod h1:716wFneO0ov19A2beH5hjfh9AK5z/VWNAtDijp1Y0/g=
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go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.46.0 h1:w53CDeOA/Kurp7yRsegSr6pbbr759dOvJ+yNmWM6Hxs=
|
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go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.46.0/go.mod h1:BOmGMCbAtvcJiSJ+hLuhgPLdDbimnraSl8irz3iY8sY=
|
||||
go.opentelemetry.io/otel/metric v1.46.0 h1:yBnkXvgV7AXFILZc5K6IZe/CBFF3OS7BJ8ov6/lj0K8=
|
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go.opentelemetry.io/otel/metric v1.46.0/go.mod h1:iPmdWqifKUdzziPkvvzIJXITl56fQx2mGM/DHLB3/2o=
|
||||
go.opentelemetry.io/otel/sdk v1.46.0 h1:h5CNQQjEbuQXY/JfZtgt3i7HVFV3aHPO2OAwO2eTYPI=
|
||||
go.opentelemetry.io/otel/sdk v1.46.0/go.mod h1:GAERFXFt5SYCEB+YiKUbMBeza6UaDH7GmGOZEfh2gSM=
|
||||
go.opentelemetry.io/otel/sdk/metric v1.46.0 h1:0piZ26EG4RBfebb2jhDH6ERCYHoVWduc3kLgPCwSnSE=
|
||||
go.opentelemetry.io/otel/sdk/metric v1.46.0/go.mod h1:I1PbKrdVc8Qu8HYVDNtqVIwLwjNrhsV/uFuxfwg8mO4=
|
||||
go.opentelemetry.io/otel/trace v1.46.0 h1:OULy7ccdJnZtJ0UDYFOIGaCmiWzJ8Vi2G/Rsu60qs1c=
|
||||
go.opentelemetry.io/otel/trace v1.46.0/go.mod h1:J7GAXweO77XSFkB/rmAqk9D6ihszhFjLU+d9WuUxDLI=
|
||||
go.opentelemetry.io/proto/otlp v1.11.0 h1:5rrYs0Ykyj50sdU/JU0x8etU+LubXWb+gED6TbEdMIk=
|
||||
go.opentelemetry.io/proto/otlp v1.11.0/go.mod h1:SmVizdCOAm3XBtG1g1NnOdhW6jtddT72hLMhv8VwA8E=
|
||||
go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
|
||||
go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
|
||||
go.yaml.in/yaml/v2 v2.4.4 h1:tuyd0P+2Ont/d6e2rl3be67goVK4R6deVxCUX5vyPaQ=
|
||||
go.yaml.in/yaml/v2 v2.4.4/go.mod h1:gMZqIpDtDqOfM0uNfy0SkpRhvUryYH0Z6wdMYcacYXQ=
|
||||
go.yaml.in/yaml/v3 v3.0.5 h1:N6y/pJk8buWs9NY5ERU2HSMfm+IuD/OtfdAnq6kESPw=
|
||||
go.yaml.in/yaml/v3 v3.0.5/go.mod h1:HVTZu1O7/Vkt2N+BFy8Zza+lnLsABggaTM2ZpNIGuKg=
|
||||
golang.org/x/net v0.58.0 h1:ynWG7rqYi4ccpTEuPZ2QGWHktVEM9DMCj9yzDE0Q7To=
|
||||
golang.org/x/net v0.58.0/go.mod h1:YwCddHnFlT7eLQqVprV19OnhLGtc5xOKgE0RyqgfWAU=
|
||||
golang.org/x/sync v0.22.0 h1:SZjpbeLmrCk4xhRSZFNZW5gFUeCeFgjekvI/+gfScek=
|
||||
golang.org/x/sync v0.22.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
|
||||
golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
|
||||
golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
|
||||
golang.org/x/text v0.41.0 h1:vz/seA0lnX87Othu2f/0L24RcgrXD9/YFTSuGjj3rH8=
|
||||
golang.org/x/text v0.41.0/go.mod h1:jvf1O8ajNzZqhSrQBPbutR/EB83Cc0CFrezNQIwbb5M=
|
||||
gonum.org/v1/gonum v0.17.0 h1:VbpOemQlsSMrYmn7T2OUvQ4dqxQXU+ouZFQsZOx50z4=
|
||||
gonum.org/v1/gonum v0.17.0/go.mod h1:El3tOrEuMpv2UdMrbNlKEh9vd86bmQ6vqIcDwxEOc1E=
|
||||
google.golang.org/genproto/googleapis/api v0.0.0-20260819154853-08b0e4226688 h1:ax2KzoSRIZU/M0cIxri3pKxy99vniH1PVxWC6si/eZI=
|
||||
google.golang.org/genproto/googleapis/api v0.0.0-20260819154853-08b0e4226688/go.mod h1:1RJ9BQGyNdZwkGc1eTqkErfRZ6RJyYPHZo73BZ1vQqI=
|
||||
google.golang.org/genproto/googleapis/rpc v0.0.0-20260819154853-08b0e4226688 h1:cYNAzI2sUwhmCcoj9TxvihSrqsxt6uIkj3rDRhSDmW4=
|
||||
google.golang.org/genproto/googleapis/rpc v0.0.0-20260819154853-08b0e4226688/go.mod h1:DjtHYE8FKJLivXcBEjGwndXfIC23G0VpXiXKqG179uA=
|
||||
google.golang.org/grpc v1.83.1 h1:HIO0+BEtBP6soyqvqC8sNUjZ7bTs+0hFQuFF+RAy++Y=
|
||||
google.golang.org/grpc v1.83.1/go.mod h1:kDyl6SKsiHKt0uylY5gtn5cEjkrIOhQOGDgIc4JGwzQ=
|
||||
google.golang.org/protobuf v1.36.12 h1:pJOKDDOyeXErUroCihFAd5LQuwXBSpVnKGrj5o/fwxc=
|
||||
google.golang.org/protobuf v1.36.12/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
|
||||
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
|
||||
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
|
||||
@@ -0,0 +1,242 @@
|
||||
// demo-app api: the "container layer" service of the self-healing lab (experiment design 3.1).
|
||||
// GET /healthz process liveness
|
||||
// GET /readyz DB ping + legacy-api /healthz (readiness)
|
||||
// GET /api/orders recent orders (DB read)
|
||||
// POST /api/orders {"item":"apple","qty":2} (DB write)
|
||||
// GET /api/price/{item} proxied from legacy-api via the ILB (LEGACY_URL, LEGACY_TIMEOUT)
|
||||
// GET /metrics Prometheus exposition (demo_http_*)
|
||||
// Traces go to OTEL_EXPORTER_OTLP_ENDPOINT (Alloy) when set.
|
||||
package main
|
||||
|
||||
import (
|
||||
"context"
|
||||
"database/sql"
|
||||
"encoding/json"
|
||||
"errors"
|
||||
"io"
|
||||
"log"
|
||||
"net/http"
|
||||
"os"
|
||||
"os/signal"
|
||||
"strconv"
|
||||
"strings"
|
||||
"syscall"
|
||||
"time"
|
||||
|
||||
_ "github.com/jackc/pgx/v5/stdlib"
|
||||
"github.com/prometheus/client_golang/prometheus"
|
||||
"github.com/prometheus/client_golang/prometheus/promhttp"
|
||||
"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
|
||||
"go.opentelemetry.io/otel"
|
||||
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
|
||||
"go.opentelemetry.io/otel/sdk/resource"
|
||||
sdktrace "go.opentelemetry.io/otel/sdk/trace"
|
||||
semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
|
||||
)
|
||||
|
||||
var (
|
||||
reqTotal = prometheus.NewCounterVec(prometheus.CounterOpts{Name: "demo_http_requests_total", Help: "HTTP requests by route and status"}, []string{"route", "status"})
|
||||
reqDur = prometheus.NewHistogramVec(prometheus.HistogramOpts{Name: "demo_http_request_duration_seconds", Help: "HTTP request latency",
|
||||
Buckets: []float64{.005, .01, .025, .05, .1, .25, .5, 1, 2.5, 5}}, []string{"route"})
|
||||
legacyDur = prometheus.NewHistogram(prometheus.HistogramOpts{Name: "demo_legacy_request_duration_seconds", Help: "Upstream legacy-api latency",
|
||||
Buckets: []float64{.005, .01, .025, .05, .1, .25, .5, 1, 2.5, 5}})
|
||||
)
|
||||
|
||||
type statusWriter struct {
|
||||
http.ResponseWriter
|
||||
code int
|
||||
}
|
||||
|
||||
func (w *statusWriter) WriteHeader(c int) { w.code = c; w.ResponseWriter.WriteHeader(c) }
|
||||
|
||||
func instrument(route string, h http.HandlerFunc) http.Handler {
|
||||
return otelhttp.NewHandler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
||||
sw := &statusWriter{ResponseWriter: w, code: 200}
|
||||
start := time.Now()
|
||||
h(sw, r)
|
||||
reqDur.WithLabelValues(route).Observe(time.Since(start).Seconds())
|
||||
reqTotal.WithLabelValues(route, strconv.Itoa(sw.code)).Inc()
|
||||
}), route)
|
||||
}
|
||||
|
||||
func writeJSON(w http.ResponseWriter, code int, v any) {
|
||||
w.Header().Set("Content-Type", "application/json")
|
||||
w.WriteHeader(code)
|
||||
_ = json.NewEncoder(w).Encode(v)
|
||||
}
|
||||
|
||||
func env(k, d string) string {
|
||||
if v := os.Getenv(k); v != "" {
|
||||
return v
|
||||
}
|
||||
return d
|
||||
}
|
||||
|
||||
func setupTracing(ctx context.Context) func(context.Context) error {
|
||||
if os.Getenv("OTEL_EXPORTER_OTLP_ENDPOINT") == "" {
|
||||
return func(context.Context) error { return nil }
|
||||
}
|
||||
exp, err := otlptracegrpc.New(ctx, otlptracegrpc.WithInsecure())
|
||||
if err != nil {
|
||||
log.Printf("otlp exporter: %v (tracing disabled)", err)
|
||||
return func(context.Context) error { return nil }
|
||||
}
|
||||
res, _ := resource.Merge(resource.Default(), resource.NewWithAttributes(semconv.SchemaURL, semconv.ServiceName("demo-api")))
|
||||
tp := sdktrace.NewTracerProvider(sdktrace.WithBatcher(exp), sdktrace.WithResource(res))
|
||||
otel.SetTracerProvider(tp)
|
||||
return tp.Shutdown
|
||||
}
|
||||
|
||||
func main() {
|
||||
prometheus.MustRegister(reqTotal, reqDur, legacyDur)
|
||||
ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
|
||||
defer stop()
|
||||
shutdownTracing := setupTracing(ctx)
|
||||
defer func() { _ = shutdownTracing(context.Background()) }()
|
||||
|
||||
dsn := os.Getenv("DB_DSN")
|
||||
var db *sql.DB
|
||||
if dsn != "" {
|
||||
var err error
|
||||
if db, err = sql.Open("pgx", dsn); err != nil {
|
||||
log.Printf("db open: %v", err)
|
||||
db = nil
|
||||
} else {
|
||||
db.SetMaxOpenConns(10)
|
||||
db.SetConnMaxLifetime(5 * time.Minute)
|
||||
}
|
||||
} else {
|
||||
log.Printf("DB_DSN not set")
|
||||
}
|
||||
legacyURL := env("LEGACY_URL", "http://10.20.0.100:8080")
|
||||
legacyTimeout, err := time.ParseDuration(env("LEGACY_TIMEOUT", "2s"))
|
||||
if err != nil {
|
||||
legacyTimeout = 2 * time.Second
|
||||
}
|
||||
legacy := &http.Client{Timeout: legacyTimeout, Transport: otelhttp.NewTransport(http.DefaultTransport)}
|
||||
|
||||
mux := http.NewServeMux()
|
||||
mux.Handle("/healthz", instrument("healthz", func(w http.ResponseWriter, r *http.Request) {
|
||||
w.Header().Set("Content-Type", "text/plain")
|
||||
_, _ = w.Write([]byte("ok\n"))
|
||||
}))
|
||||
mux.Handle("/readyz", instrument("readyz", func(w http.ResponseWriter, r *http.Request) {
|
||||
ctx, cancel := context.WithTimeout(r.Context(), 3*time.Second)
|
||||
defer cancel()
|
||||
problems := map[string]string{}
|
||||
if db == nil {
|
||||
problems["db"] = "not configured"
|
||||
} else if err := db.PingContext(ctx); err != nil {
|
||||
problems["db"] = err.Error()
|
||||
}
|
||||
req, _ := http.NewRequestWithContext(ctx, http.MethodGet, legacyURL+"/healthz", nil)
|
||||
if resp, err := legacy.Do(req); err != nil {
|
||||
problems["legacy"] = err.Error()
|
||||
} else {
|
||||
_, _ = io.Copy(io.Discard, resp.Body)
|
||||
resp.Body.Close()
|
||||
if resp.StatusCode != 200 {
|
||||
problems["legacy"] = "status " + strconv.Itoa(resp.StatusCode)
|
||||
}
|
||||
}
|
||||
if len(problems) > 0 {
|
||||
writeJSON(w, 503, map[string]any{"ready": false, "problems": problems})
|
||||
return
|
||||
}
|
||||
writeJSON(w, 200, map[string]any{"ready": true})
|
||||
}))
|
||||
mux.Handle("/api/orders", instrument("orders", func(w http.ResponseWriter, r *http.Request) {
|
||||
if db == nil {
|
||||
writeJSON(w, 503, map[string]string{"error": "db unavailable"})
|
||||
return
|
||||
}
|
||||
ctx, cancel := context.WithTimeout(r.Context(), 2*time.Second)
|
||||
defer cancel()
|
||||
switch r.Method {
|
||||
case http.MethodGet:
|
||||
rows, err := db.QueryContext(ctx, "SELECT id, item, qty, status, created_at FROM app.orders ORDER BY id DESC LIMIT 20")
|
||||
if err != nil {
|
||||
log.Printf("orders query: %v", err)
|
||||
writeJSON(w, 503, map[string]string{"error": "db unavailable"})
|
||||
return
|
||||
}
|
||||
defer rows.Close()
|
||||
type order struct {
|
||||
ID int64 `json:"id"`
|
||||
Item string `json:"item"`
|
||||
Qty int `json:"qty"`
|
||||
Status string `json:"status"`
|
||||
CreatedAt time.Time `json:"created_at"`
|
||||
}
|
||||
out := []order{}
|
||||
for rows.Next() {
|
||||
var o order
|
||||
if err := rows.Scan(&o.ID, &o.Item, &o.Qty, &o.Status, &o.CreatedAt); err != nil {
|
||||
writeJSON(w, 500, map[string]string{"error": err.Error()})
|
||||
return
|
||||
}
|
||||
out = append(out, o)
|
||||
}
|
||||
writeJSON(w, 200, map[string]any{"orders": out, "count": len(out)})
|
||||
case http.MethodPost:
|
||||
var in struct {
|
||||
Item string `json:"item"`
|
||||
Qty int `json:"qty"`
|
||||
}
|
||||
if err := json.NewDecoder(io.LimitReader(r.Body, 4096)).Decode(&in); err != nil || in.Item == "" || in.Qty <= 0 {
|
||||
writeJSON(w, 400, map[string]string{"error": "item and positive qty required"})
|
||||
return
|
||||
}
|
||||
var id int64
|
||||
err := db.QueryRowContext(ctx, "INSERT INTO app.orders (item, qty) VALUES ($1, $2) RETURNING id", in.Item, in.Qty).Scan(&id)
|
||||
if err != nil {
|
||||
if strings.Contains(err.Error(), "violates foreign key") {
|
||||
writeJSON(w, 404, map[string]string{"error": "unknown item", "item": in.Item})
|
||||
return
|
||||
}
|
||||
log.Printf("orders insert: %v", err)
|
||||
writeJSON(w, 503, map[string]string{"error": "db unavailable"})
|
||||
return
|
||||
}
|
||||
writeJSON(w, 201, map[string]any{"id": id, "item": in.Item, "qty": in.Qty, "status": "new"})
|
||||
default:
|
||||
writeJSON(w, 405, map[string]string{"error": "method not allowed"})
|
||||
}
|
||||
}))
|
||||
mux.Handle("/api/price/", instrument("price", func(w http.ResponseWriter, r *http.Request) {
|
||||
item := strings.TrimPrefix(r.URL.Path, "/api/price/")
|
||||
if item == "" || strings.Contains(item, "/") {
|
||||
writeJSON(w, 404, map[string]string{"error": "item required"})
|
||||
return
|
||||
}
|
||||
req, _ := http.NewRequestWithContext(r.Context(), http.MethodGet, legacyURL+"/v1/price/"+item, nil)
|
||||
start := time.Now()
|
||||
resp, err := legacy.Do(req)
|
||||
legacyDur.Observe(time.Since(start).Seconds())
|
||||
if err != nil {
|
||||
code := 502
|
||||
if errors.Is(err, context.DeadlineExceeded) || os.IsTimeout(err) {
|
||||
code = 504
|
||||
}
|
||||
writeJSON(w, code, map[string]string{"error": "legacy-api unreachable", "detail": err.Error()})
|
||||
return
|
||||
}
|
||||
defer resp.Body.Close()
|
||||
w.Header().Set("Content-Type", "application/json")
|
||||
w.WriteHeader(resp.StatusCode)
|
||||
_, _ = io.Copy(w, resp.Body)
|
||||
}))
|
||||
mux.Handle("/metrics", promhttp.Handler())
|
||||
|
||||
srv := &http.Server{Addr: ":" + env("PORT", "8080"), Handler: mux, ReadHeaderTimeout: 5 * time.Second}
|
||||
go func() {
|
||||
<-ctx.Done()
|
||||
sctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
|
||||
defer cancel()
|
||||
_ = srv.Shutdown(sctx)
|
||||
}()
|
||||
log.Printf("demo-api listening on %s (legacy=%s timeout=%s)", srv.Addr, legacyURL, legacyTimeout)
|
||||
if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
|
||||
log.Fatal(err)
|
||||
}
|
||||
}
|
||||
Reference in new issue
Block a user