From 01d9c7e2b2a26a7605150720a97fb96dc5ae16e0 Mon Sep 17 00:00:00 2001
From: Peter Admilson Ramaldes <peter.ramaldes@gmail.com>
Date: Wed, 6 Apr 2022 02:53:28 -0300
Subject: [PATCH] Created Ping API

---
 go.mod      |  3 +++
 handlers.go |  7 +++++++
 http.go     |  8 ++++++++
 main.go     | 11 +++++++++++
 ping.go     | 29 +++++++++++++++++++++++++++++
 5 files changed, 58 insertions(+)
 create mode 100644 go.mod
 create mode 100644 handlers.go
 create mode 100644 http.go
 create mode 100644 main.go
 create mode 100644 ping.go

diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..25bb1a7
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/peterramaldes/billgo
+
+go 1.18
diff --git a/handlers.go b/handlers.go
new file mode 100644
index 0000000..37f0eed
--- /dev/null
+++ b/handlers.go
@@ -0,0 +1,7 @@
+package main
+
+import "net/http"
+
+func handlers(mux *http.ServeMux) {
+	mux.Handle("/ping", &pingHandler{})
+}
diff --git a/http.go b/http.go
new file mode 100644
index 0000000..580ac0e
--- /dev/null
+++ b/http.go
@@ -0,0 +1,8 @@
+package main
+
+import "net/http"
+
+func notFound(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(http.StatusNotFound)
+	w.Write([]byte(`{"error": "not found"}`))
+}
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..44587f1
--- /dev/null
+++ b/main.go
@@ -0,0 +1,11 @@
+package main
+
+import (
+	"net/http"
+)
+
+func main() {
+	mux := http.NewServeMux()
+	handlers(mux)
+	http.ListenAndServe(":3000", mux)
+}
diff --git a/ping.go b/ping.go
new file mode 100644
index 0000000..9c3f678
--- /dev/null
+++ b/ping.go
@@ -0,0 +1,29 @@
+package main
+
+import (
+	"net/http"
+	"regexp"
+)
+
+var (
+	pingRe = regexp.MustCompile(`^\/ping*$`)
+)
+
+type pingHandler struct{}
+
+func (h *pingHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("content-type", "application/json")
+	switch {
+	case r.Method == http.MethodGet && pingRe.MatchString(r.URL.Path):
+		h.Ping(w, r)
+		return
+	default:
+		notFound(w, r)
+		return
+	}
+}
+
+func (h *pingHandler) Ping(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(http.StatusOK)
+	w.Write([]byte(`{"status": "alive"}`))
+}