test app with postgres and redis healthchecks

.gitignore

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+*.exe
+

Dockerfile

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+FROM golang:1.25-alpine AS builder
+WORKDIR /src
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN go build -o /test-app .
+
+FROM alpine:3.20
+RUN apk add --no-cache ca-certificates
+COPY --from=builder /test-app /usr/local/bin/test-app
+EXPOSE 8080
+ENTRYPOINT ["test-app"]

go.mod

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+module test-app
+
+go 1.25.6
+
+require (
+	github.com/lib/pq v1.12.3
+	github.com/redis/go-redis/v9 v9.18.0
+)
+
+require (
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	go.uber.org/atomic v1.11.0 // indirect
+)

go.sum

@@ -0,0 +1,24 @@
+github.com/bsm/ginkgo/v2 v2.12.0 h1:Ny8MWAHyOepLGlLKYmXG4IEkioBysk6GpaRTLC8zwWs=
+github.com/bsm/ginkgo/v2 v2.12.0/go.mod h1:SwYbGRRDovPVboqFv0tPTcG1sN61LM1Z4ARdbAV9g4c=
+github.com/bsm/gomega v1.27.10 h1:yeMWxP2pV2fG3FgAODIY8EiRE3dy0aeFYt4l7wh6yKA=
+github.com/bsm/gomega v1.27.10/go.mod h1:JyEr/xRbxbtgWNi8tIEVPUYZ5Dzef52k01W3YH0H+O0=
+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/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
+github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
+github.com/klauspost/cpuid/v2 v2.0.9 h1:lgaqFMSdTdQYdZ04uHyN2d/eKdOMyi2YLSvlQIBFYa4=
+github.com/klauspost/cpuid/v2 v2.0.9/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
+github.com/lib/pq v1.12.3 h1:tTWxr2YLKwIvK90ZXEw8GP7UFHtcbTtty8zsI+YjrfQ=
+github.com/lib/pq v1.12.3/go.mod h1:/p+8NSbOcwzAEI7wiMXFlgydTwcgTr3OSKMsD2BitpA=
+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/redis/go-redis/v9 v9.18.0 h1:pMkxYPkEbMPwRdenAzUNyFNrDgHx9U+DrBabWNfSRQs=
+github.com/redis/go-redis/v9 v9.18.0/go.mod h1:k3ufPphLU5YXwNTUcCRXGxUoF1fqxnhFQmscfkCoDA0=
+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/zeebo/xxh3 v1.0.2 h1:xZmwmqxHZA8AI603jOQ0tMqmBr9lPeFwGg6d+xy9DC0=
+github.com/zeebo/xxh3 v1.0.2/go.mod h1:5NWz9Sef7zIDm2JHfFlcQvNekmcEl9ekUZQQKCYaDcA=
+go.uber.org/atomic v1.11.0 h1:ZvwS0R+56ePWxUNi+Atn9dWONBPp/AUETXlHW0DxSjE=
+go.uber.org/atomic v1.11.0/go.mod h1:LUxbIzbOniOlMKjJjyPfpl4v+PKK2cNJn91OQbhoJI0=

main.go

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+package main
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"time"
+
+	_ "github.com/lib/pq"
+	"github.com/redis/go-redis/v9"
+)
+
+type result struct {
+	Name    string
+	OK      bool
+	Message string
+}
+
+func env(key, fallback string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return fallback
+}
+
+func testPostgres() result {
+	dsn := fmt.Sprintf("host=%s port=%s user=%s password=%s dbname=%s sslmode=disable",
+		env("POSTGRES_HOST", "localhost"),
+		env("POSTGRES_PORT", "5432"),
+		env("POSTGRES_USER", "app"),
+		env("POSTGRES_PASSWORD", ""),
+		env("POSTGRES_DB", "app"),
+	)
+	db, err := sql.Open("postgres", dsn)
+	if err != nil {
+		return result{"PostgreSQL", false, fmt.Sprintf("open: %v", err)}
+	}
+	defer db.Close()
+	db.SetConnMaxLifetime(5 * time.Second)
+
+	_, err = db.Exec(`CREATE TABLE IF NOT EXISTS healthcheck (id SERIAL PRIMARY KEY, checked_at TIMESTAMPTZ DEFAULT NOW(), msg TEXT)`)
+	if err != nil {
+		return result{"PostgreSQL", false, fmt.Sprintf("create table: %v", err)}
+	}
+
+	_, err = db.Exec(`INSERT INTO healthcheck (msg) VALUES ($1)`, fmt.Sprintf("ping at %s", time.Now().Format(time.RFC3339)))
+	if err != nil {
+		return result{"PostgreSQL", false, fmt.Sprintf("insert: %v", err)}
+	}
+
+	var count int
+	err = db.QueryRow(`SELECT COUNT(*) FROM healthcheck`).Scan(&count)
+	if err != nil {
+		return result{"PostgreSQL", false, fmt.Sprintf("count: %v", err)}
+	}
+
+	return result{"PostgreSQL", true, fmt.Sprintf("OK — %d rows in healthcheck", count)}
+}
+
+func testRedis() result {
+	addr := fmt.Sprintf("%s:%s",
+		env("REDIS_HOST", "localhost"),
+		env("REDIS_PORT", "6379"),
+	)
+	rdb := redis.NewClient(&redis.Options{Addr: addr})
+	defer rdb.Close()
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	err := rdb.Set(ctx, "test-key", "hello from test-app", 0).Err()
+	if err != nil {
+		return result{"Redis", false, fmt.Sprintf("SET: %v", err)}
+	}
+
+	val, err := rdb.Get(ctx, "test-key").Result()
+	if err != nil {
+		return result{"Redis", false, fmt.Sprintf("GET: %v", err)}
+	}
+
+	return result{"Redis", true, fmt.Sprintf("OK — GET test-key = %q", val)}
+}
+
+func handler(w http.ResponseWriter, r *http.Request) {
+	if r.URL.Path == "/healthz" {
+		w.WriteHeader(200)
+		fmt.Fprint(w, "ok")
+		return
+	}
+
+	pg := testPostgres()
+	rd := testRedis()
+
+	w.Header().Set("Content-Type", "text/html; charset=utf-8")
+	fmt.Fprintf(w, `<!DOCTYPE html>
+<html>
+<head>
+  <title>StackOps Test App</title>
+  <style>
+    body { font-family: 'JetBrains Mono', monospace; background: #0a0a0a; color: #e5e5e5; padding: 40px; }
+    h1 { color: #4ade80; }
+    .test { margin: 16px 0; padding: 16px; border-radius: 8px; border: 1px solid #333; }
+    .ok { border-color: #166534; background: #052e16; }
+    .fail { border-color: #7f1d1d; background: #1c0a0a; }
+    .label { font-size: 14px; color: #9ca3af; }
+    .status { font-size: 18px; margin-top: 4px; }
+    .ok .status { color: #4ade80; }
+    .fail .status { color: #f87171; }
+    .time { color: #6b7280; font-size: 12px; margin-top: 24px; }
+  </style>
+</head>
+<body>
+  <h1>StackOps Test App</h1>
+  <p style="color:#9ca3af">Dependency connectivity checks</p>
+`)
+	for _, t := range []result{pg, rd} {
+		cls := "ok"
+		if !t.OK {
+			cls = "fail"
+		}
+		fmt.Fprintf(w, `  <div class="test %s">
+    <div class="label">%s</div>
+    <div class="status">%s</div>
+  </div>
+`, cls, t.Name, t.Message)
+	}
+	fmt.Fprintf(w, `  <div class="time">Checked at %s</div>
+</body>
+</html>`, time.Now().Format(time.RFC3339))
+}
+
+func main() {
+	http.HandleFunc("/", handler)
+	port := env("PORT", "8080")
+	log.Printf("test-app listening on :%s", port)
+	log.Fatal(http.ListenAndServe(":"+port, nil))
+}

stackfile.toml

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+[app]
+name     = "test-app"
+image    = "git.nodeup.ru/stackops/test-app:latest"
+replicas = 1
+port     = 8080
+
+[ingress]
+host = "test.app.nodeup.ru"
+path = "/"
+tls  = true
+
+[health]
+liveness  = "/healthz"
+readiness = "/healthz"
+
+[dependencies.postgres]
+version = "15"
+storage = "1Gi"
+
+[dependencies.redis]
+version = "7"
+storage = "1Gi"