Backend uses Node EventEmitter modules to decouple controllers from Socket.IO.

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Emitter modules

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Order emitter events

Registered in registerOrderListeners():

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Index setting emitter

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User setting emitter

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Market data emitter

Per-index {index}TickData events update latestDataMap in socket manager — not directly forwarded (ZerodhaEventProcessor also uses io.emit for client ticks).

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Producers

Controllers and utils emit events after DB writes:
  • zerodha.controller.ts — orders, financial data
  • indexSetting.controller.ts — CRUD
  • user.controller.ts — profile updates
  • order.controller.ts — reset index
  • recurringOrder.controller.ts — recurring flags
  • scheduleOrder.controller.ts — schedule rows