96 lines
2.4 KiB
Go
96 lines
2.4 KiB
Go
package main
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import (
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"fmt"
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"io"
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"log"
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"net/http"
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"os"
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"time"
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)
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func env(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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type status struct {
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Service string `json:"service"`
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OK bool `json:"ok"`
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Data string `json:"data"`
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}
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func fetchUsers(usersURL string) status {
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client := &http.Client{Timeout: 5 * time.Second}
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resp, err := client.Get(usersURL + "/users")
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if err != nil {
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return status{"users-api", false, fmt.Sprintf("error: %v", err)}
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}
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defer resp.Body.Close()
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body, _ := io.ReadAll(resp.Body)
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if resp.StatusCode != 200 {
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return status{"users-api", false, fmt.Sprintf("status %d: %s", resp.StatusCode, body)}
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}
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return status{"users-api", true, string(body)}
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}
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func main() {
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usersURL := env("USERS_API_URL", "http://users-api:8080")
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http.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(200)
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})
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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if r.URL.Path == "/healthz" {
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w.WriteHeader(200)
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return
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}
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users := fetchUsers(usersURL)
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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fmt.Fprintf(w, `<!DOCTYPE html>
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<html>
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<head>
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<title>API Gateway</title>
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<style>
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body { font-family: 'JetBrains Mono', monospace; background: #0a0a0a; color: #e5e5e5; padding: 40px; }
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h1 { color: #60a5fa; }
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.svc { margin: 16px 0; padding: 16px; border-radius: 8px; border: 1px solid #333; }
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.ok { border-color: #166534; background: #052e16; }
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.fail { border-color: #7f1d1d; background: #1c0a0a; }
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.label { font-size: 14px; color: #9ca3af; }
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.url { font-size: 11px; color: #6b7280; margin-top: 2px; }
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.data { font-size: 13px; margin-top: 8px; color: #d1d5db; }
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.ok .data { color: #4ade80; }
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.fail .data { color: #f87171; }
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.time { color: #6b7280; font-size: 12px; margin-top: 24px; }
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</style>
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</head>
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<body>
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<h1>API Gateway</h1>
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<p style="color:#9ca3af">Service-to-service communication test</p>
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`)
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cls := "ok"
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if !users.OK {
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cls = "fail"
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}
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fmt.Fprintf(w, ` <div class="svc %s">
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<div class="label">%s</div>
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<div class="url">→ %s</div>
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<div class="data">%s</div>
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</div>
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`, cls, users.Service, usersURL, users.Data)
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fmt.Fprintf(w, ` <div class="time">Checked at %s</div>
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</body></html>`, time.Now().Format(time.RFC3339))
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})
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port := env("PORT", "8080")
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log.Printf("api-gateway listening on :%s", port)
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log.Fatal(http.ListenAndServe(":"+port, nil))
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}
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