move from deadbeef.codes to stevenpolley.net

.drone.yml

@@ -3,7 +3,7 @@ name: default
 
 workspace:
   base: /go
-  path: src/deadbeef.codes/steven/siteviewcounter
+  path: src/code.stevenpolley.net/steven/siteviewcounter
 
 steps:
 
@@ -22,4 +22,4 @@ steps:
 - name: package in docker container
   image: plugins/docker
   settings:
-    repo: registry.deadbeef.codes/siteviewcounter
+    repo: registry.stevenpolley.net/siteviewcounter

Dockerfile

@@ -1,5 +1,5 @@
 FROM scratch
-
+LABEL maintainer="himself@stevenpolley.net"
 COPY siteviewcounter .
 
 EXPOSE 8080

README.md

@@ -4,31 +4,31 @@
 
 A simple view counter for a website
 
-### Database initialization
+### Requirements
 
-The following SQL will initialize the database for this application.  No automigrate / initialization is done upon first running the application, so this must be ran by an administrator.  
+* Go
+* Docker
+* Docker Compose (Optional) or Kubernetes (Optional)
 
-```sql 
+### Build Application
-SET NAMES utf8;
-SET time_zone = '+00:00';
-SET foreign_key_checks = 0;
 
-CREATE DATABASE `counter` /*!40100 DEFAULT CHARACTER SET latin1 */;
+```bash
-USE `counter`;
 
-CREATE TABLE `visit` (
+go build -a -ldflags '-w'
-  `id` int(11) NOT NULL AUTO_INCREMENT,
-  `ip_address` varchar(15) NOT NULL,
-  `visits` int(11) NOT NULL,
-  `last_visited` datetime NOT NULL,
-  PRIMARY KEY (`id`)
-) ENGINE=InnoDB DEFAULT CHARSET=latin1;
 
 ```
 
 ### Build Container
 
-Disclaimer!  If you use this, you'll need to build the container yourself.  My registry is used for my internal infrastructure only and is not publicly available.  
+Disclaimer!  If you use this, you'll need to build the container yourself.  I have a CICD pipeline setup, but my registry is used for my internal infrastructure only and is not publicly available.  
+
+Because this is a staticly linked binary with no external runtime dependancies, the container literally only contains the binary file, keeping it clean and low in size (6.3MB).  I never did understand why people include operating systems in containers.  
+
+```bash
+
+docker build -t siteviewconter:latest .
+
+```
 
 ### Example docker-compose.yml
 
@@ -41,7 +41,7 @@ version: '3.7'
 services:
  
   counter:
-    image: registry.deadbeef.codes/siteviewcounter:latest
+    image: siteviewcounter:latest
     restart: always
     expose:
       - "8080"

countersql/database.go

@@ -6,11 +6,14 @@ import (
 )
 
 // Configuration holds the DSN connection string and a resource Semaphore to limit the number of active connections
+// Note: This is a copied design pattern I've used for other projects which had much more data inside a Configuration struct.
+// Examples include semaphores and persistent connection pools, which I've stripped out for this project.
 type Configuration struct {
 	DSN string
 }
 
 // Connection represents a single connection to the database, however there may be many instances / connections
+// Note: This is a copied design pattern I've used for other projects which had much more data inside a Connection struct.
 type Connection struct {
 	DB *sql.DB
 }
@@ -83,3 +86,31 @@ func (conf Configuration) Connect() (*Connection, error) {
 
 	return conn, nil
 }
+
+// InitializeDatabase will check if tables exist in the database, and if not then create them.
+func (conn Connection) InitializeDatabase() error {
+	rows, err := conn.DB.Query(`SHOW TABLES`)
+	if err != nil {
+		return fmt.Errorf("SHOW TABLES query failed: %v", err)
+	}
+	defer rows.Close()
+
+	if rows.Next() { // Table already exists, leave with no error
+		return nil
+	}
+
+	// Table does not exist, create it
+	_, err = conn.DB.Exec(`CREATE TABLE visit (
+		id int(11) NOT NULL AUTO_INCREMENT,
+		ip_address varchar(15) NOT NULL,
+		visits int(11) NOT NULL,
+		last_visited datetime NOT NULL,
+		PRIMARY KEY (id)
+	  ) ENGINE=InnoDB DEFAULT CHARSET=latin1;`)
+
+	if err != nil {
+		return fmt.Errorf("failed to create table: %v", err)
+	}
+
+	return nil
+}

go.mod

@@ -0,0 +1,7 @@
+module deadbeef.codes/steven/siteviewcounter
+
+go 1.22
+
+require github.com/go-sql-driver/mysql v1.8.1
+
+require filippo.io/edwards25519 v1.1.0 // indirect

go.sum

@@ -0,0 +1,4 @@
+filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
+filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
+github.com/go-sql-driver/mysql v1.8.1 h1:LedoTUt/eveggdHS9qUFC1EFSa8bU2+1pZjSRpvNJ1Y=
+github.com/go-sql-driver/mysql v1.8.1/go.mod h1:wEBSXgmK//2ZFJyE+qWnIsVGmvmEKlqwuVSjsCm7DZg=

main.go

@@ -57,6 +57,13 @@ func init() {
 		log.Fatalf("failed to connect to database: %v", err)
 	}
 
+	// Check if database needs to be initialized (create tables)
+	// does nothing if tables exist
+	err = dbConn.InitializeDatabase()
+	if err != nil {
+		log.Fatalf("failed to initialize database: %v", err)
+	}
+
 	uniqueVisits, err = dbConn.GetUniqueVisits()
 	if err != nil {
 		log.Fatalf("failed to get number of unique visits from database: %v", err)