Initial scaffold: Go service, Helm chart, Kustomize overlays
This commit is contained in:
rod
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hello-svc
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+11
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FROM golang:1.23-alpine AS builder
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WORKDIR /app
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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 CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o hello-svc .
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FROM gcr.io/distroless/static-debian12
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COPY --from=builder /app/hello-svc /hello-svc
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EXPOSE 8080
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ENTRYPOINT ["/hello-svc"]
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module git.samidare.dev/rod/hello-svc
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go 1.23
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require github.com/prometheus/client_golang v1.22.0
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require (
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github.com/beorn7/perks v1.0.1 // indirect
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github.com/cespare/xxhash/v2 v2.3.0 // indirect
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github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
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github.com/prometheus/client_model v0.6.1 // indirect
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github.com/prometheus/common v0.62.0 // indirect
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github.com/prometheus/procfs v0.15.1 // indirect
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golang.org/x/sys v0.30.0 // indirect
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google.golang.org/protobuf v1.36.5 // indirect
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)
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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/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 v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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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/klauspost/compress v1.18.0 h1:c/Cqfb0r+Yi+JtIEq73FWXVkRonBlf0CRNYc8Zttxdo=
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github.com/klauspost/compress v1.18.0/go.mod h1:2Pp+KzxcywXVXMr50+X0Q/Lsb43OQHYWRCY2AiWywWQ=
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github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
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github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
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github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
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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 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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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 v1.22.0 h1:rb93p9lokFEsctTys46VnV1kLCDpVZ0a/Y92Vm0Zc6Q=
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github.com/prometheus/client_golang v1.22.0/go.mod h1:R7ljNsLXhuQXYZYtw6GAE9AZg8Y7vEW5scdCXrWRXC0=
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github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p8ais2e9E=
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github.com/prometheus/client_model v0.6.1/go.mod h1:OrxVMOVHjw3lKMa8+x6HeMGkHMQyHDk9E3jmP2AmGiY=
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github.com/prometheus/common v0.62.0 h1:xasJaQlnWAeyHdUBeGjXmutelfJHWMRr+Fg4QszZ2Io=
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github.com/prometheus/common v0.62.0/go.mod h1:vyBcEuLSvWos9B1+CyL7JZ2up+uFzXhkqml0W5zIY1I=
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github.com/prometheus/procfs v0.15.1 h1:YagwOFzUgYfKKHX6Dr+sHT7km/hxC76UB0learggepc=
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github.com/prometheus/procfs v0.15.1/go.mod h1:fB45yRUv8NstnjriLhBQLuOUt+WW4BsoGhij/e3PBqk=
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github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
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github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
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golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
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golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
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google.golang.org/protobuf v1.36.5 h1:tPhr+woSbjfYvY6/GPufUoYizxw1cF/yFoxJ2fmpwlM=
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google.golang.org/protobuf v1.36.5/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
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gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
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gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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apiVersion: kustomize.config.k8s.io/v1beta1
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kind: Kustomization
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helmCharts:
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- name: hello-svc
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releaseName: hello-svc
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localChartPath: ../../helm/hello-svc
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valuesFile: values.yaml
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# Base Helm values — overlays patch on top of this via strategic merge.
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replicaCount: 1
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image:
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repository: git.samidare.dev/rod/hello-svc
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pullPolicy: Always
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tag: "latest"
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env:
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APP_ENV: production
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LOG_LEVEL: info
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APP_VERSION: unknown
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resources:
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requests:
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cpu: 100m
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memory: 64Mi
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limits:
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cpu: 500m
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memory: 128Mi
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serviceMonitor:
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enabled: true
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interval: 30s
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: hello-svc
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spec:
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replicas: 1
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template:
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spec:
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containers:
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- name: hello-svc
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env:
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- name: APP_ENV
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value: dev
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- name: LOG_LEVEL
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value: debug
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resources:
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requests:
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cpu: 50m
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memory: 32Mi
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limits:
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cpu: 100m
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memory: 64Mi
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apiVersion: kustomize.config.k8s.io/v1beta1
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kind: Kustomization
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namespace: dev
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resources:
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- ../../base
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- namespace.yaml
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patches:
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- path: deployment-patch.yaml
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apiVersion: v1
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kind: Namespace
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metadata:
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name: dev
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: hello-svc
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spec:
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replicas: 3
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template:
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spec:
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containers:
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- name: hello-svc
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env:
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- name: APP_ENV
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value: prod
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- name: LOG_LEVEL
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value: info
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resources:
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requests:
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cpu: 100m
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memory: 64Mi
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limits:
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cpu: 500m
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memory: 128Mi
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apiVersion: kustomize.config.k8s.io/v1beta1
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kind: Kustomization
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namespace: prod
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resources:
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- ../../base
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- namespace.yaml
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patches:
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- path: deployment-patch.yaml
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apiVersion: v1
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kind: Namespace
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metadata:
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name: prod
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package main
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import (
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"encoding/json"
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"log/slog"
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"net/http"
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"os"
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"strconv"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promauto"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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)
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var (
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reqTotal = promauto.NewCounterVec(prometheus.CounterOpts{
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Name: "http_requests_total",
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Help: "Total number of HTTP requests.",
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}, []string{"method", "path", "status"})
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reqDuration = promauto.NewHistogramVec(prometheus.HistogramOpts{
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Name: "http_request_duration_seconds",
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Help: "HTTP request latency in seconds.",
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Buckets: prometheus.DefBuckets,
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}, []string{"method", "path"})
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)
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func main() {
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env := getenv("APP_ENV", "dev")
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version := getenv("APP_VERSION", "unknown")
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port := getenv("PORT", "8080")
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logLevel := slog.LevelInfo
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if getenv("LOG_LEVEL", "info") == "debug" {
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logLevel = slog.LevelDebug
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}
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slog.SetDefault(slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: logLevel})))
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mux := http.NewServeMux()
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mux.Handle("/metrics", promhttp.Handler())
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mux.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusOK)
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})
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mux.HandleFunc("/", instrument(func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(map[string]string{
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"env": env,
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"version": version,
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})
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}))
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slog.Info("listening", "port", port, "env", env, "version", version)
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if err := http.ListenAndServe(":"+port, mux); err != nil {
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slog.Error("server failed", "err", err)
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os.Exit(1)
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}
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}
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func instrument(next http.HandlerFunc) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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rw := &statusWriter{ResponseWriter: w, status: http.StatusOK}
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start := time.Now()
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next(rw, r)
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dur := time.Since(start).Seconds()
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status := strconv.Itoa(rw.status)
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reqTotal.WithLabelValues(r.Method, r.URL.Path, status).Inc()
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reqDuration.WithLabelValues(r.Method, r.URL.Path).Observe(dur)
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slog.Debug("request", "method", r.Method, "path", r.URL.Path, "status", rw.status, "duration", dur)
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}
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}
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type statusWriter struct {
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http.ResponseWriter
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status int
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}
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func (sw *statusWriter) WriteHeader(code int) {
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sw.status = code
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sw.ResponseWriter.WriteHeader(code)
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}
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func getenv(key, fallback string) string {
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if v := os.Getenv(key); v != "" {
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return v
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}
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return fallback
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}
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