Add /health and /ready for transcoder

transcoder/src/api/health.go

@@ -0,0 +1,40 @@
+package api
+
+import (
+	"github.com/jackc/pgx/v5/pgxpool"
+	"github.com/labstack/echo/v4"
+)
+
+type health struct {
+	db *pgxpool.Pool
+}
+
+func RegisterHealthHandlers(e *echo.Group, db *pgxpool.Pool) {
+	h := health{db}
+	e.GET("/health", h.CheckHealth)
+	e.GET("/ready", h.CheckReady)
+}
+
+func (h *health) CheckHealth(c echo.Context) error {
+	return c.JSON(200, struct {
+		Status string `json:"status"`
+	}{Status: "healthy"})
+}
+
+func (h *health) CheckReady(c echo.Context) error {
+	_, err := h.db.Exec(c.Request().Context(), "select 1")
+
+	status := "healthy"
+	db := "healthy"
+	ret := 200
+	if err != nil {
+		status = "unhealthy"
+		ret = 500
+		db = err.Error()
+	}
+
+	return c.JSON(ret, struct {
+		Status   string `json:"status"`
+		Database string `json:"database"`
+	}{Status: status, Database: db})
+}