admin
0d8f5b9600
- Add /health and /ready endpoints for load balancer health checks - Replace in-memory JWT token cache with Redis for multi-replica support - Reduce DB connection pool from 100 to 25 connections per replica - Add distributed rate limiting (100 req/min + 20 burst) using Redis - Implement circuit breakers for DB and Redis to prevent cascading failures This enables the service to scale horizontally with multiple replicas behind a load balancer without exhausting database connections or maintaining separate token caches per instance.
60 lines
1.6 KiB
Go
60 lines
1.6 KiB
Go
package db
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import (
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"authorization/helper"
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"database/sql"
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"fmt"
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"log"
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"os"
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"time"
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_ "github.com/go-sql-driver/mysql"
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)
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// DB is the global database connection pool
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var DB *sql.DB
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// DBCircuitBreaker protects database operations
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var DBCircuitBreaker *helper.CircuitBreaker
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func InitDB() (*sql.DB, error) {
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// Get connection details from environment variables (loaded in main)
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connStr := fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?parseTime=true",
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os.Getenv("DB_USER"),
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os.Getenv("DB_PASSWORD"),
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os.Getenv("DB_HOST"),
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os.Getenv("DB_PORT"),
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os.Getenv("DB_NAME"),
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)
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// Open the database connection
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var err error
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DB, err = sql.Open("mysql", connStr)
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if err != nil {
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return nil, fmt.Errorf("error opening database: %v", err)
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}
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// Initialize circuit breaker
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DBCircuitBreaker = helper.NewCircuitBreaker("database", 5, 2*time.Second)
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// Set connection pool parameters optimized for horizontal scaling
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// Lower per-replica to allow more replicas without exhausting DB connections
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DB.SetMaxOpenConns(25) // Maximum number of open connections to the database
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DB.SetMaxIdleConns(10) // Maximum number of connections in the idle connection pool
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DB.SetConnMaxLifetime(5 * time.Minute) // Maximum amount of time a connection may be reused
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// Check if the database connection is working with circuit breaker
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err = DBCircuitBreaker.Call(func() error {
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return DB.Ping()
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})
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if err != nil {
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log.Printf("Database connection lost: %v. Reconnecting...", err)
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DB, err = InitDB()
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if err != nil {
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log.Printf("Failed to reconnect to database: %v", err)
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}
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}
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log.Print("Database connected successfully!")
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return DB, nil
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}
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