mohashari

var (
    ordersCreated = promauto.NewCounterVec(prometheus.CounterOpts{
        Name: "orders_created_total",
        Help: "Total orders created",
    }, []string{"payment_method", "tier"})

    orderValue = promauto.NewHistogramVec(prometheus.HistogramOpts{
        Name:    "order_value_dollars",
        Help:    "Distribution of order values",
        Buckets: []float64{1, 5, 10, 25, 50, 100, 250, 500, 1000},

mohashari

// Bad: This function does 3 things
func processUser(userID string) error {
    // 1. Validate
    if userID == "" {
        return errors.New("user ID required")
    }

    // 2. Fetch from DB
    user, err := db.GetUser(userID)
    if err != nil {

mohashari

feature/oauth-google-login
fix/order-status-not-updating
chore/upgrade-postgres-16
experiment/grpc-migration-poc

mohashari

// BAD: Trust third-party data blindly
resp := stripe.GetPayment(paymentID)
db.Save(Payment{Amount: resp.Amount, Currency: resp.Currency})

// GOOD: Validate before using
resp := stripe.GetPayment(paymentID)
if resp.Amount <= 0 || resp.Amount > MaxPaymentAmount {
    return errors.New("invalid amount from payment provider")
}
if !validCurrencies[resp.Currency] {

mohashari

func ReplayOrder(events []Event) Order {
    var order Order
    for _, event := range events {
        switch e := event.(type) {
        case OrderPlaced:
            order.ID = e.OrderID
            order.Status = "pending"
            order.Items = e.Items
            order.Total = e.Total
        case PaymentTaken:

mohashari

# Find files
find /var/log -name "*.log" -newer /tmp/marker
find . -name "*.go" -size +1M
find . -mtime -1  # Modified in last 24 hours

# Search inside files
grep -r "ERROR" /var/log/myapp/
grep -r "panic" . --include="*.go"
grep -n "func.*Handler" src/api/*.go

mohashari

upstream backend {
    server 192.168.1.10:8080 max_fails=3 fail_timeout=30s;
    server 192.168.1.11:8080 max_fails=3 fail_timeout=30s;
}

mohashari

-- Partition orders by year/month
CREATE TABLE orders (
    id BIGSERIAL,
    user_id INT NOT NULL,
    amount DECIMAL NOT NULL,
    created_at TIMESTAMP NOT NULL
) PARTITION BY RANGE (created_at);

CREATE TABLE orders_2025 PARTITION OF orders
    FOR VALUES FROM ('2025-01-01') TO ('2026-01-01');

mohashari

// Type guard: narrows type based on runtime check
function isApiError(error: unknown): error is ApiError {
    return (
        typeof error === 'object' &&
        error !== null &&
        'statusCode' in error &&
        'message' in error
    );
}

mohashari

func (c *Client) writePump(conn *websocket.Conn) {
    ticker := time.NewTicker(30 * time.Second)
    defer func() {
        ticker.Stop()
        conn.Close()
    }()

    conn.SetPongHandler(func(string) error {
        conn.SetReadDeadline(time.Now().Add(65 * time.Second))
        return nil