golang-web

Go Web Architecture

Core Principles

• Standard layout — Follow cmd/internal/pkg convention
• Explicit dependencies — Wire dependencies in main.go, no globals
• Interface-driven — Define interfaces where you use them, not where you implement
• Error wrapping — Wrap errors with context, use error codes
• No backwards compatibility — Delete, don't deprecate. Change directly
• LiteLLM for LLM APIs — Use LiteLLM proxy for all LLM integrations

---

No Backwards Compatibility

Delete unused code. Change directly. No compatibility layers.

// ❌ BAD: Deprecated function kept around
// Deprecated: Use NewUserService instead
func CreateUserService() *UserService { ... }

// ❌ BAD: Alias for renamed types
type OldName = NewName // "for backwards compatibility"

// ❌ BAD: Unused parameters
func Process(_ context.Context, data Data) { ... }

// ✅ GOOD: Just delete and update all usages
func NewUserService(repo UserRepository) *UserService { ... }

---

LiteLLM for LLM APIs

Use LiteLLM proxy. Don't call provider APIs directly.

// adapters/llm/client.go
package llm

import (
    "github.com/sashabaranov/go-openai"
)

// Connect to LiteLLM proxy using OpenAI-compatible SDK
func NewClient(cfg Config) *openai.Client {
    config := openai.DefaultConfig(cfg.APIKey)
    config.BaseURL = cfg.BaseURL // LiteLLM proxy URL
    return openai.NewClientWithConfig(config)
}

---

Quick Start

1. Initialize Project

mkdir myapp && cd myapp
go mod init github.com/yourname/myapp

# Install core dependencies
go get github.com/gin-gonic/gin
go get github.com/spf13/viper
go get github.com/sirupsen/logrus
go get gorm.io/gorm

2. Apply Tech Stack

Layer	Recommendation
HTTP Framework	Gin / Chi / Echo
Configuration	Viper
Logging	Logrus / Zap / Slog
Database ORM	GORM / sqlx / sqlc
Validation	go-playground/validator
Testing	testify / go test

Version Strategy