Trade Push

Client can get real-time trade updates from trade gateway.

Example

from time import sleep
from decimal import Decimal
from longport.openapi import TradeContext, Config, OrderSide, OrderType, TimeInForceType, PushOrderChanged, TopicType

def on_order_changed(event: PushOrderChanged):
    print(event)

config = Config.from_env()
ctx = TradeContext(config)
ctx.set_on_order_changed(on_order_changed)
ctx.subscribe([TopicType.Private])

resp = ctx.submit_order(
    side=OrderSide.Buy,
    symbol="700.HK",
    order_type=OrderType.LO,
    submitted_price=Decimal(50),
    submitted_quantity=Decimal(200),
    time_in_force=TimeInForceType.Day,
    remark="Hello from Python SDK",
)
print(resp)
sleep(5)  # waiting for push event

# Finally, unsubscribe
ctx.unsubscribe([TopicType.Private])

Subscribe

Python	longport.openapi.TradeContext.subscribe
Rust	longport::trade::TradeContext#subscribe
Go	TradeContext.Subscribe
Node.js	TradeContext#subscribe

info

Cmd: 16

Protobuf definition:

// Sub is Sub command content, command is 16
message Sub {
  repeated string topics = 1;
}

// SubResponse is response of Sub Request
message SubResponse {
  message Fail {
    string topic = 1;
    string reason = 2;
  }
  repeated string success = 1; // success topics
  repeated Fail fail = 2; // failed topics
  repeated string current = 3;  // curent subscriptions after subscribe
}

Current support topics:

• private - private notification for trade

Cancel Subscribe

Python	longport.openapi.TradeContext.unsubscribe
Rust	longport::trade::TradeContext#unsubscribe
Go	TradeContext.Unsubscribe
Node.js	TradeContext#unsubscribe

info

Cmd: 17

Protobuf defination:

// Unsub is Unsub command content, command is 17
message Unsub {
  repeated string topics = 1;
}

// UnsubResponse is response of Unsub request
message UnsubResponse {
  repeated string current = 3; // current subscriptions after cancel subscribe
}

Push Notification

After we subscribe to the trade gateway, we can get real-time trade updates from the trade gateway. The trade gateway will push the corresponding push message to the client. The SDK's set_on_order_changed (In Go is: OnTrade) can set the callback function of the push message. When the client receives the trade push message, the callback function will be called.

Python	longport.openapi.TradeContext.set_on_order_changed
Rust	longport::trade::TradeContext#set_on_order_changed
Go	TradeContext.OnTrade
Node.js	TradeContext#setOnOrderChanged

info

Cmd: 18

Protobuf defination:

// Dispatch type
enum DispatchType {
  DISPATCH_UNDEFINED = 0;
  DISPATCH_DIRECT = 1;
  DISPATCH_BROADCAST = 2;
}

enum ContentType {
  CONTENT_UNDEFINED = 0;
  CONTENT_JSON = 1;
  CONTENT_PROTO = 2;
}

// Notification is push message, command is 18
message Notification {
  string topic = 1;
  ContentType content_type = 2;
  DispatchType dispatch_type = 3;
  bytes data = 4;
}