Merge pull request 'feat/healthz' (#6) from feat/healthz into main

Reviewed-on: #6

README.md

@@ -9,20 +9,26 @@ Short is a very simple url shortener build in golang using gorilla/mux for url r
 ```shell
 Usage of short:
   -addr string
-      Address to listen for connections (default "localhost")
+        Address to listen for connections (default "localhost")
+  -cleanup int
+        Cleanup interval in hours, default 1 (default 1)
   -domain string
-      Domain to write to the URLs (default "localhost")
+        Domain to write to the URLs (default "localhost")
-  -dump string
+  -dumpFile string
-      Path to the file to dump the kv db (default "urls.json")
+        urls.json (default "Path to the file to dump the kv db")
+  -exp int
+        Default expiration time in hours, default 240 (default 240)
+  -http
+        proto to the base URL (HTTPS://localhost/path/... no real https here just to set the url (for like a proxy offloading https
   -path string
-      Path to the base URL (https://localhost/PATH/... remember to append a / at the end
+        Path to the base URL (https://localhost/PATH/...
-  -port string
+  -port int
-      Port to listen for connections (default "8080")
+        Port to listen for connections (default 8080)
-  -proto string
+  -size int
-      proto to the base URL (HTTPS://localhost/path/... no real https here just to set the url (for like a proxy offloading https (default "https")
+        Define the size of the shortened String (default 10)
-  -urlsize int
+  -urlPort int
-      Define the size of the shortened String, default 10 (default 10)
+        Port to use for building URLs (default 443)
-  -v  prints current version
+  -v    prints current version
 ```
 
 Includes a Dockerfile to for a standalone docker image.

internal/shortie/shortie.go

@@ -184,7 +184,7 @@ func internalError(msg string, err error) body {
 	}
 }
 
-// IndexHandler return a fasthttp.RequestHandler function that genetares the index page
+// IndexHandler return a fasthttp.RequestHandler function that generates the index page
 func IndexHandler(t *template.Template) func(ctx *fasthttp.RequestCtx) {
 	return func(ctx *fasthttp.RequestCtx) {
 		ctx.Response.Header.SetCanonical([]byte("Content-Type"), []byte("text/html"))
@@ -196,7 +196,7 @@ func IndexHandler(t *template.Template) func(ctx *fasthttp.RequestCtx) {
 	}
 }
 
-// Short return a fasthttp.RequestHandler function that genetares the shortener page
+// Short return a fasthttp.RequestHandler function that generates the shortener page
 func Short(t *template.Template) func(ctx *fasthttp.RequestCtx) {
 	return func(ctx *fasthttp.RequestCtx) {
 		ctx.Response.Header.SetCanonical([]byte("Content-Type"), []byte("text/html"))
@@ -227,7 +227,7 @@ func Short(t *template.Template) func(ctx *fasthttp.RequestCtx) {
 	}
 }
 
-// Redir return a fasthttp.RequestHandler function that genetares the shortener redirect page
+// Redir return a fasthttp.RequestHandler function that generates the shortener redirect page
 func Redir(t *template.Template) func(ctx *fasthttp.RequestCtx) {
 	return func(ctx *fasthttp.RequestCtx) {
 		ctx.Response.Header.SetCanonical([]byte("Content-Type"), []byte("text/html"))

main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"encoding/json"
 	"flag"
 	"fmt"
 	"html/template"
@@ -56,6 +57,33 @@ func getHTTP(ctx *fasthttp.RequestCtx) string {
 	return "HTTP/1.0"
 }
 
+func healthz() func(ctx *fasthttp.RequestCtx) {
+	r := struct {
+		Status     string `json:"status"`
+		StatusCode int    `json:"status_code"`
+	}{
+		Status:     "ok",
+		StatusCode: 200,
+	}
+
+	t := time.Now()
+	shortie.Pool.Set("status", t.Unix(), -1)
+	s, f := shortie.Pool.Get("status")
+
+	if !f || s != t.Unix() {
+		r.Status = "error"
+		r.StatusCode = 500
+	}
+
+	return func(ctx *fasthttp.RequestCtx) {
+		ctx.Response.Header.SetCanonical([]byte("Content-Type"), []byte("application/json"))
+		ctx.Response.SetStatusCode(r.StatusCode)
+		if err := json.NewEncoder(ctx).Encode(r); err != nil {
+			ctx.Error(err.Error(), fasthttp.StatusInternalServerError)
+		}
+	}
+}
+
 func main() {
 	var (
 		addr       = flag.String("addr", "localhost", "Address to listen for connections")
@@ -121,6 +149,7 @@ func main() {
 	r.GET("/", shortie.IndexHandler(t))
 	r.POST("/", shortie.Short(t))
 	r.GET("/{key}", shortie.Redir(t))
+	r.GET("/healthz", healthz())
 	r.GET("/v1/toFile", shortie.ToFile(t))
 	r.GET("/v1/fromFile", shortie.FromFile(t))
 	r.GET("/v1/count", func(ctx *fasthttp.RequestCtx) { fmt.Fprintf(ctx, "%v", shortie.Pool.ItemCount()) })