Redis Client for V

This module provides a Redis client implementation in V that supports the Redis Serialization Protocol (RESP) with a type-safe interface for common Redis commands.

Features

Type-Safe Commands: Auto-detects value types at compile time
Pipeline Support: Group commands for batch execution
Connection Pooling: Efficient resource management
RESP Protocol Support: Full Redis Serialization Protocol implementation
Memory Efficient: Pre-allocated buffers for minimal allocations

Quick Start

module main

import db.redis

fn main() {
	// Connect to Redis
	mut db := redis.connect(redis.Config{
		host: 'localhost'
		port: 6379
	})!

	// Set and get values
	db.set('name', 'Alice')!
	name := db.get[string]('name')!
	println('Name: ${name}') // Output: Name: Alice

	// Integer operations
	db.set('counter', 42)!
	db.incr('counter')!
	counter := db.get[int]('counter')!
	println('Counter: ${counter}') // Output: Counter: 43

	// Clean up
	db.close()!
}

Supported Commands

Key Operations

// Set value
db.set('key', 'value')!
db.set('number', 42)!
db.set('binary', []u8{len: 4, init: 0})!

// Get value
str_value := db.get[string]('key')!
int_value := db.get[int]('number')!
bin_value := db.get[[]u8]('binary')!

// Delete key
db.del('key')!

// Set expiration
db.expire('key', 60)!  // 60 seconds

Hash Operations

// Set hash fields
db.hset('user:1', {
    'name': 'Bob',
    'age': 30,
})!

// Get single field
name := db.hget[string]('user:1', 'name')!

// Get all fields
user_data := db.hgetall[string]('user:1')!
println(user_data)  // Output: {'name': 'Bob', 'age': '30'}

Pipeline Operations

// Start pipeline
db.pipeline_start()

// Queue commands
db.incr('counter')
db.set('name', 'Charlie')
db.get[string]('name')

// Execute and get responses
responses := db.pipeline_execute()!
for resp in responses {
    println(resp)
}

Custom Commands

// Run raw commands
resp := db.cmd('SET', 'custom', 'value')!
result := db.cmd('GET', 'custom')!

// Complex commands
db.cmd('HSET', 'user:2', 'field1', 'value1', 'field2', '42')!

Error Handling

All functions return ! types and will return detailed errors for:

Connection issues
Protocol violations
Type mismatches
Redis error responses
Timeout conditions

result := db.get[string]('nonexistent') or {
    println('Key not found')
    return
}

Connection Management

config := redis.Config{
    host: 'redis.server'
    port: 6379
    version: 2  // RESP2 protocol
}

mut db := redis.connect(config)!
defer {
    db.close() or { eprintln('Error closing connection: $err') }
}

Performance Tips

Reuse Connections: Maintain connections instead of creating new ones
Use Pipelines: Batch commands for high-throughput operations
Prefer Integers: Use numeric types for counters and metrics
Specify Types: Always specify return types for get operations