Merge pull request #1 from ashleyprimo/v1.1.0

Version 1.1.0 - Refactor + New Features
ashleyprimo · Jan 17, 2022 · f811ff0 · f811ff0
2 parents 9c8d457 + 122a65a
commit f811ff0
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Showing 10 changed files with 520 additions and 194 deletions.
diff --git a/README.md b/README.md
@@ -10,11 +10,13 @@
 **Public Endpoint**: https://qr-api.ashleyprimo.com/docs
 
 ```
-Usage of go-qr-generator:
+Usage of ./go-qr-generator:
   -address string
     	The address to listen on for HTTP requests. (default "0.0.0.0")
-  -defualtQRSize string
-    	Default QR Image Size, if unspecified by end user. (default "250")
+  -enable.docs
+    	Enable documentation (/docs) endpoint. (default true)
+  -enable.metrics
+    	Enable metrics (/metrics) endpoint. (default true)
   -https
     	Enable, or Disable HTTPS
   -log.conn
@@ -23,16 +25,40 @@ Usage of go-qr-generator:
     	The level of logs to log (default "info")
   -port string
     	The port number to listen on for HTTP requests. (default "8080")
+  -qr.default.size int
+    	Default QR Image Size, if unspecified by end user. (default 250)
+  -qr.endpoint string
+    	QR API endpoint location (default "/")
+  -qr.max.size int
+    	Maximum QR Image Size (default 1000)
   -server_crt string
     	Certificate file (default "server.crt")
   -server_key string
     	Certificate key file. (default "server.key")
+  -v	Outputs package version
 ```
 
 ## Endpoints
 * `/` -> API endpoint.
 * `/docs` -> Simple API documentation
 * `/health` -> Simple Health Check 
+* `/metrics` -> [Prometheus](https://prometheus.io/) Metrics Endpoint
+
+## Metrics
+Current available metrics
+```
+# HELP qr_generator_requests Completed requests to QR API endpoint.
+# TYPE qr_generator_requests counter
+qr_generator_requests{type="2xx"} 0
+qr_generator_requests{type="4xx"} 0
+qr_generator_requests{type="5xx"} 0
+# HELP qr_generator_requests_total Total number of requests to QR API endpoint.
+# TYPE qr_generator_requests_total counter
+qr_generator_requests_total 0
+# HELP qr_generator_version current running version
+# TYPE qr_generator_version gauge
+qr_generator_version{version="1.1.0"} 0
+```
 
 ## Docker
 You can get started with docker quickly, by using the `docker pull ashleyprimo/go-qr-generator:latest` or alternatively you can build your own image using `docker build ./ -t go-qr-generator:latest`

diff --git a/documentation/documentation.go b/documentation/documentation.go
@@ -0,0 +1,57 @@
+package docs
+
+import (
+	"fmt"
+	"strconv"
+        "net/http"
+
+        "github.com/ashleyprimo/go-qr-generator/initialize"
+)
+
+func Landing(w http.ResponseWriter, r *http.Request) {
+	const (
+		documentationPage = `
+<html>
+	<head>
+		<title>%[1]s API documentation</title>
+		
+		<meta charset="utf-8">
+		<meta content="width=device-width, initial-scale=1" name="viewport">
+
+		<style>
+			body {
+				background-color: #5c5b5b;
+
+				color: #ffffff;
+				font-family: monospace;
+
+				padding: 5%%;
+			}
+
+			h1 {
+				text-align: center;
+				text-transform: capitalize;
+			}
+
+			.img-center {
+				margin-left: auto;
+				margin-right: auto;
+				display: block;
+			}
+		</style>
+	</head>
+	<body>
+		<h1><a href="https://github.com/ashleyprimo/go-qr-generator">%[1]s</a> API documentation</h1>
+		<h2>How to make a request</h2>
+    <p>It's very simple, there are two possible parameters currently, <code>size</code> (which is optional) and <code>data</code> (which is mandatory)!<p>
+    <p>Please Note: The requested size must be no more than %[4]sx%[4]s pixels<p>
+    <p>Example Request: <code>http://%[2]s%[3]s?size=%[5]s&data=This%%20is%%20an%%20example</code></p>
+    <p>This above example, will generate a QR code with the text "This is an example", with a size of %[5]sx%[5]s pixels- it's that easy.</p>
+		<img src="http://%[2]s%[3]s?size=%[5]s&data=This%%20is%%20an%%20example.">
+	</body>
+</html>
+		`
+	)
+	w.Write([]byte(fmt.Sprintf(documentationPage, initialize.ApplicationName, r.Host, *initialize.QREndpoint, strconv.Itoa(*initialize.MaxSize), strconv.Itoa(*initialize.DefaultSize))))
+}
+
diff --git a/go.mod b/go.mod
@@ -7,4 +7,15 @@ require (
 	github.com/sirupsen/logrus v1.8.1
 )
 
-require golang.org/x/sys v0.0.0-20191026070338-33540a1f6037 // indirect
+require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.1.1 // indirect
+	github.com/golang/protobuf v1.4.3 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/prometheus/client_golang v1.11.0 // indirect
+	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/common v0.26.0 // indirect
+	github.com/prometheus/procfs v0.6.0 // indirect
+	golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40 // indirect
+	google.golang.org/protobuf v1.26.0-rc.1 // indirect
+)
diff --git a/go.sum b/go.sum
@@ -1,12 +1,145 @@
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diff --git a/initialize/flags.go b/initialize/flags.go
@@ -0,0 +1,45 @@
+package initialize
+
+import (
+	"flag"
+
+        log "github.com/sirupsen/logrus"
+)
+
+var (
+        // Webserver Flags
+        PortNumber      = flag.String("port", "8080", "The port number to listen on for HTTP requests.")
+        Address         = flag.String("address", "0.0.0.0", "The address to listen on for HTTP requests.")
+
+        Https           = flag.Bool("https", false, "Enable, or Disable HTTPS")
+        Server_crt      = flag.String("server_crt", "server.crt", "Certificate file")
+        Server_key      = flag.String("server_key", "server.key", "Certificate key file.")
+
+        // QR Setup Flags
+	QREndpoint      = flag.String("qr.endpoint", "/", "QR API endpoint location")
+
+        DefaultSize     = flag.Int("qr.default.size", 250, "Default QR Image Size, if unspecified by end user.")
+	MaxSize         = flag.Int("qr.max.size", 1000, "Maximum QR Image Size")
+
+        // Logging Flags
+        LogLevel        = flag.String("log.level", "info", "The level of logs to log")
+       	LogConn         = flag.Bool("log.conn", true, "Log connections to API")
+
+        // Documentation Flags
+        EnableDocs      = flag.Bool("enable.docs", true, "Enable documentation (/docs) endpoint.")
+
+	// Metrics Flagd
+	EnableMetrics   = flag.Bool("enable.metrics", true, "Enable metrics (/metrics) endpoint.")
+
+        // Misc Flags
+        VersionFlag     = flag.Bool("v", false, "Outputs package version")
+)
+
+func Flags() {
+	flag.Parse()
+
+	// Flag Sanity Check
+	if *DefaultSize > *MaxSize {
+		log.Fatalf("-qr.default.size cannot be bigger than -qr.max.size!")
+	}
+}