Add postgres storage

api/api.go

@@ -1,14 +1,16 @@
 package api
 
 import (
-	"fmt"
+	"encoding/json"
+	"log/slog"
 	"net/http"
 
+	"github.com/gevulotnetwork/devnet-explorer/model"
 	"github.com/julienschmidt/httprouter"
 )
 
 type Store interface {
-	Hello() string
+	Stats() (model.Stats, error)
 }
 
 type API struct {
@@ -30,9 +32,19 @@ func (a *API) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 }
 
 func (a *API) bind() {
-	a.r.GET("/", a.helloWorld)
+	a.r.GET("/api/v1/stat", a.stats)
 }
 
-func (a *API) helloWorld(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
-	fmt.Fprint(w, a.s.Hello())
+func (a *API) stats(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
+	stats, err := a.s.Stats()
+	if err != nil {
+		slog.Error("failed to get stats", slog.Any("error", err))
+		http.Error(w, "failed to get stats", http.StatusInternalServerError)
+		return
+	}
+
+	if err := json.NewEncoder(w).Encode(stats); err != nil {
+		slog.Error("failed encode stats", slog.Any("error", err))
+		return
+	}
 }

app/app.go

@@ -4,6 +4,7 @@ package app
 import (
 	"context"
 	"errors"
+	"fmt"
 	"log/slog"
 	"net/http"
 	"os"
@@ -14,12 +15,18 @@ import (
 )
 
 // Run starts the application and listens for OS signals to gracefully shutdown.
-func Run() error {
-	conf := ParseConfig()
+func Run(args ...string) error {
+	conf := ParseConfig(args...)
+
+	s, err := store.New(conf.DSN)
+	if err != nil {
+		return fmt.Errorf("failed to create store: %w", err)
+	}
+
 	sigInt := make(chan os.Signal, 1)
 	srv := &http.Server{
 		Addr:    conf.ServerListenAddr,
-		Handler: api.New(store.New()),
+		Handler: api.New(s),
 	}
 
 	r := NewRunner()
@@ -53,13 +60,21 @@ func Run() error {
 
 type Config struct {
 	ServerListenAddr string
+	DSN              string
 }
 
-func ParseConfig() Config {
+func ParseConfig(args ...string) Config {
 	addr := os.Getenv("SERVER_LISTEN_ADDR")
 	if addr == "" {
 		addr = "127.0.0.1:8383"
 	}
+	dsn := os.Getenv("DSN")
+	if dsn == "" {
+		dsn = "postgres://gevulot:gevulot@localhost:5432/gevulot"
+	}
 
-	return Config{ServerListenAddr: addr}
+	return Config{
+		ServerListenAddr: addr,
+		DSN:              dsn,
+	}
 }

docker-compose.yml

@@ -0,0 +1,16 @@
+version: '3'
+
+services:
+  db:
+    image: 'docker.io/library/postgres:16-alpine'
+    ports:
+      - 5432:5432
+    environment:
+      - POSTGRES_USER=gevulot
+      - POSTGRES_PASSWORD=gevulot
+      - POSTGRES_DB=gevulot
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U gevulot -d gevulot"]
+      interval: 1s
+      timeout: 2s
+      retries: 30