The following details how to configure the development environment for docker/go-events, providing specific code examples to assist with various configuration options.

Environment Variables

Configuration can be controlled through environment variables, which can be set up in your .env file.

Example .env File

DATABASE_URL=postgres://user:password@localhost:5432/events_db?sslmode=disable

REDIS_URL=redis://localhost:6379

EVENTS_LOG_LEVEL=debug

In this example:

• DATABASE_URL specifies the connection string for the PostgreSQL database.
• REDIS_URL is used to configure the connection to Redis.
• EVENTS_LOG_LEVEL determines the verbosity level of logging. Options generally include debug, info, warn, and error.

Configuration Files

Another method of configuration is through YAML or JSON files that can be interpreted by the application.

Example config.yaml

database:
  url: "postgres://user:password@localhost:5432/events_db?sslmode=disable"

redis:
  url: "redis://localhost:6379"

logging:
  level: "debug"

To load this configuration in your Go application, you can use a library like viper.

Code Snippet for Loading Configuration

import (
    "github.com/spf13/viper"
    "log"
)

func loadConfig() {
    viper.SetConfigName("config") // name of config file (without extension)
    viper.SetConfigType("yaml")   // or viper.SetConfigType("json")
    viper.AddConfigPath(".")      // optionally look for config in the working directory

    err := viper.ReadInConfig() // Find and read the config file
    if err != nil {             // Handle errors reading the config file
        log.Fatalf("Error reading config file, %s", err)
    }
}

Command-Line Arguments

Configuration can also be passed through command-line arguments when starting the application.

Example Command

go run main.go --db-url=postgres://user:password@localhost:5432/events_db --log-level=debug

Code Snippet for Parsing Command-Line Arguments

import (
    "flag"
    "log"
)

var dbUrl string
var logLevel string

func init() {
    flag.StringVar(&dbUrl, "db-url", "default_db_url", "Database URL")
    flag.StringVar(&logLevel, "log-level", "info", "Logging level")
}

func main() {
    flag.Parse()

    log.Printf("Using Database URL: %s", dbUrl)
    log.Printf("Logging Level Set to: %s", logLevel)
}

Configuring Docker

When configuring the Docker environment, you’ll need to ensure the environment variables are correctly set in the docker-compose.yml file.

Example docker-compose.yml

version: '3.8'

services:
  app:
    image: go-events:latest
    environment:
      - DATABASE_URL=${DATABASE_URL}
      - REDIS_URL=${REDIS_URL}
      - EVENTS_LOG_LEVEL=${EVENTS_LOG_LEVEL}
    ports:
      - "8080:8080"
    depends_on:
      - db
      - redis
      
  db:
    image: postgres:latest
    environment:
      POSTGRES_USER: user
      POSTGRES_PASSWORD: password
      POSTGRES_DB: events_db
    ports:
      - "5432:5432"

  redis:
    image: redis:latest
    ports:
      - "6379:6379"

Ensure that the environment variables defined in the .env file are available to the Docker service.

Conclusion

Configuration for the development environment in docker/go-events involves environment variables, configuration files, command-line arguments, and Docker-specific setups. Be meticulous in managing these aspects to ensure seamless operation of your development environment.

Source: Original source of information given, no external sources referenced.