44 lines
2.0 KiB
TypeScript
44 lines
2.0 KiB
TypeScript
import { assert } from '@0xproject/assert';
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import { schemas } from '@0xproject/json-schemas';
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import * as _ from 'lodash';
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import { OrderbookChannelMessage, OrderbookChannelMessageTypes } from '../types';
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import { relayerResponseJsonParsers } from './relayer_response_json_parsers';
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export const orderbookChannelMessageParser = {
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parse(utf8Data: string): OrderbookChannelMessage {
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// parse the message
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const messageObj = JSON.parse(utf8Data);
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// ensure we have a type parameter to switch on
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const type: string = _.get(messageObj, 'type');
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assert.assert(!_.isUndefined(type), `Message is missing a type parameter: ${utf8Data}`);
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assert.isString('type', type);
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// ensure we have a request id for the resulting message
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const requestId: number = _.get(messageObj, 'requestId');
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assert.assert(!_.isUndefined(requestId), `Message is missing a requestId parameter: ${utf8Data}`);
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assert.isNumber('requestId', requestId);
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switch (type) {
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case OrderbookChannelMessageTypes.Snapshot: {
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assert.doesConformToSchema('message', messageObj, schemas.relayerApiOrderbookChannelSnapshotSchema);
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const orderbookJson = messageObj.payload;
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const orderbook = relayerResponseJsonParsers.parseOrderbookResponseJson(orderbookJson);
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return _.assign(messageObj, { payload: orderbook });
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}
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case OrderbookChannelMessageTypes.Update: {
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assert.doesConformToSchema('message', messageObj, schemas.relayerApiOrderbookChannelUpdateSchema);
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const orderJson = messageObj.payload;
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const order = relayerResponseJsonParsers.parseOrderJson(orderJson);
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return _.assign(messageObj, { payload: order });
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}
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default: {
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return {
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type: OrderbookChannelMessageTypes.Unknown,
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requestId,
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payload: undefined,
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};
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}
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}
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},
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};
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