🧊 Streaming Real-Time Quotes

Request: subscribe to live tick updates for predefined symbols Continuously streams the latest bid/ask prices and timestamps for each symbol.

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Code Example

// --- Quick use (service wrapper) ---
// Streams live ticks for default symbols (EURUSD, GBPUSD in demo); stops after ~30s.
svc.StreamQuotes(ctx)

// --- Low-level (direct account call) ---
// Preconditions: account is already connected.

symbols := []string{"EURUSD", "GBPUSD"}

ctx, cancel := context.WithCancel(context.Background())
defer cancel()

tickCh, errCh := account.OnSymbolTick(ctx, symbols)

fmt.Println("🔄 Streaming ticks...")
for {
    select {
    case tick, ok := <-tickCh:
        if !ok {
            fmt.Println("✅ Tick stream ended.")
            return
        }
        if sym := tick.GetSymbolTick(); sym != nil {
            fmt.Printf("[Tick] %s | Bid: %.5f | Ask: %.5f | Time: %s\n",
                sym.GetSymbol(),
                sym.GetBid(),
                sym.GetAsk(),
                sym.GetTime().AsTime().Format("2006-01-02 15:04:05"))
        }

    case err := <-errCh:
        log.Printf("❌ Stream error: %v", err)
        return

    case <-time.After(30 * time.Second): // demo timeout
        fmt.Println("⏱️ Timeout reached.")
        return
    }
}

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Method Signature

func (s *MT4Service) StreamQuotes(ctx context.Context)

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🔽 Input

Field	Type	Description
ctx	context.Context	Controls stream lifetime and cancellation.

The wrapper uses a predefined symbol list (e.g., EURUSD, GBPUSD). Adjust as needed.

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⬆️ Output

Stream of *pb.OnSymbolTickData packets. Each packet may contain SymbolTick with:

Field	Type	Description
Symbol	string	Trading symbol name.
Bid	float64	Current bid price.
Ask	float64	Current ask price.
Time	timestamp	UTC time of the quote.

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🎯 Purpose

Receive continuous real-time market data for selected symbols — ideal for live dashboards, widgets, and spread tracking.

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🧩 Notes & Tips

• Per-symbol cache: Keep a map[string]Quote] of last values and update only on change to reduce UI churn.
• Both channels: Always consume data and error channels to avoid leaks.
• Display precision: Use symbol Digits (from SymbolParams) for formatting; keep raw doubles for math.

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⚠️ Pitfalls

• Nil checks: SymbolTick can be nil in a packet — guard before reading fields (as in example).
• Ordering: Do not assume packets are strictly chronological across symbols.
• Bursts: Rapid bursts can overwhelm rendering; debounce or batch prints.