diff options
Diffstat (limited to 'packages/connect/src')
| -rw-r--r-- | packages/connect/src/types.ts | 4 | ||||
| -rw-r--r-- | packages/connect/src/ws_orderbook_channel.ts | 70 |
2 files changed, 25 insertions, 49 deletions
diff --git a/packages/connect/src/types.ts b/packages/connect/src/types.ts index 5ea114371..d7d7a96d0 100644 --- a/packages/connect/src/types.ts +++ b/packages/connect/src/types.ts @@ -39,8 +39,8 @@ export interface OrderbookChannelHandler { subscriptionOpts: OrderbookChannelSubscriptionOpts, order: SignedOrder, ) => void; - onError: (channel: OrderbookChannel, subscriptionOpts: OrderbookChannelSubscriptionOpts, err: Error) => void; - onClose: (channel: OrderbookChannel, subscriptionOpts: OrderbookChannelSubscriptionOpts) => void; + onError: (channel: OrderbookChannel, err: Error) => void; + onClose: (channel: OrderbookChannel) => void; } export type OrderbookChannelMessage = diff --git a/packages/connect/src/ws_orderbook_channel.ts b/packages/connect/src/ws_orderbook_channel.ts index ed31bc833..01aaf4fd2 100644 --- a/packages/connect/src/ws_orderbook_channel.ts +++ b/packages/connect/src/ws_orderbook_channel.ts @@ -12,30 +12,32 @@ import { import { assert } from './utils/assert'; import { orderbookChannelMessageParser } from './utils/orderbook_channel_message_parser'; -interface Subscription { - subscriptionOpts: OrderbookChannelSubscriptionOpts; - handler: OrderbookChannelHandler; -} - /** * This class includes all the functionality related to interacting with a websocket endpoint * that implements the standard relayer API v0 */ export class WebSocketOrderbookChannel implements OrderbookChannel { private _client: WebSocket.w3cwebsocket; - private _subscriptions: Subscription[] = []; + private _handler: OrderbookChannelHandler; + private _subscriptionOptsList: OrderbookChannelSubscriptionOpts[] = []; /** * Instantiates a new WebSocketOrderbookChannel instance - * @param url The relayer API base WS url you would like to interact with + * @param client A WebSocket client + * @param handler An OrderbookChannelHandler instance that responds to various + * channel updates * @return An instance of WebSocketOrderbookChannel */ - constructor(client: WebSocket.w3cwebsocket) { + constructor(client: WebSocket.w3cwebsocket, handler: OrderbookChannelHandler) { + assert.isOrderbookChannelHandler('handler', handler); + // set private members this._client = client; + this._handler = handler; + // attach client callbacks this._client.onerror = err => { - this._alertAllHandlersToError(err); + this._handler.onError(this, err); }; this._client.onclose = () => { - this._alertAllHandlersToClose(); + this._handler.onClose(this); }; this._client.onmessage = message => { this._handleWebSocketMessage(message); @@ -45,23 +47,16 @@ export class WebSocketOrderbookChannel implements OrderbookChannel { * Subscribe to orderbook snapshots and updates from the websocket * @param subscriptionOpts An OrderbookChannelSubscriptionOpts instance describing which * token pair to subscribe to - * @param handler An OrderbookChannelHandler instance that responds to various - * channel updates */ - public subscribe(subscriptionOpts: OrderbookChannelSubscriptionOpts, handler: OrderbookChannelHandler): void { + public subscribe(subscriptionOpts: OrderbookChannelSubscriptionOpts): void { assert.isOrderbookChannelSubscriptionOpts('subscriptionOpts', subscriptionOpts); - assert.isOrderbookChannelHandler('handler', handler); assert.assert(this._client.readyState === WebSocket.w3cwebsocket.OPEN, 'WebSocket connection is closed'); - const newSubscription: Subscription = { - subscriptionOpts, - handler, - }; - this._subscriptions.push(newSubscription); + this._subscriptionOptsList.push(subscriptionOpts); // TODO: update requestId management to use UUIDs for v2 const subscribeMessage = { type: 'subscribe', channel: 'orderbook', - requestId: this._subscriptions.length - 1, + requestId: this._subscriptionOptsList.length - 1, payload: subscriptionOpts, }; this._client.send(JSON.stringify(subscribeMessage)); @@ -72,55 +67,36 @@ export class WebSocketOrderbookChannel implements OrderbookChannel { public close(): void { this._client.close(); } - /** - * For use in cases where we need to alert all handlers of an error - */ - private _alertAllHandlersToError(error: Error): void { - _.forEach(this._subscriptions, subscription => { - subscription.handler.onError(this, subscription.subscriptionOpts, error); - }); - } - private _alertAllHandlersToClose(): void { - _.forEach(this._subscriptions, subscription => { - subscription.handler.onClose(this, subscription.subscriptionOpts); - }); - } private _handleWebSocketMessage(message: any): void { // if we get a message with no data, alert all handlers and return if (_.isUndefined(message.data)) { - this._alertAllHandlersToError(new Error(`Message does not contain utf8Data`)); + this._handler.onError(this, new Error(`Message does not contain utf8Data`)); return; } // try to parse the message data and route it to the correct handler try { const utf8Data = message.data; const parserResult = orderbookChannelMessageParser.parse(utf8Data); - const subscription = this._subscriptions[parserResult.requestId]; - if (_.isUndefined(subscription)) { - this._alertAllHandlersToError(new Error(`Message has unknown requestId: ${utf8Data}`)); + const subscriptionOpts = this._subscriptionOptsList[parserResult.requestId]; + if (_.isUndefined(subscriptionOpts)) { + this._handler.onError(this, new Error(`Message has unknown requestId: ${utf8Data}`)); return; } - const handler = subscription.handler; - const subscriptionOpts = subscription.subscriptionOpts; switch (parserResult.type) { case OrderbookChannelMessageTypes.Snapshot: { - handler.onSnapshot(this, subscriptionOpts, parserResult.payload); + this._handler.onSnapshot(this, subscriptionOpts, parserResult.payload); break; } case OrderbookChannelMessageTypes.Update: { - handler.onUpdate(this, subscriptionOpts, parserResult.payload); + this._handler.onUpdate(this, subscriptionOpts, parserResult.payload); break; } default: { - handler.onError( - this, - subscriptionOpts, - new Error(`Message has unknown type parameter: ${utf8Data}`), - ); + this._handler.onError(this, new Error(`Message has unknown type parameter: ${utf8Data}`)); } } } catch (error) { - this._alertAllHandlersToError(error); + this._handler.onError(this, error); } } } |