1 files changed, 40 insertions, 0 deletions
diff --git a/packages/connect/src/utils/orderbook_channel_message_parser.ts b/packages/connect/src/utils/orderbook_channel_message_parser.ts
new file mode 100644
index 000000000..adc565d29
--- /dev/null
+++ b/packages/connect/src/utils/orderbook_channel_message_parser.ts
@@ -0,0 +1,40 @@
+import {assert} from '@0xproject/assert';
+import {schemas} from '@0xproject/json-schemas';
+import * as _ from 'lodash';
+
+import {
+    OrderbookChannelMessage,
+    OrderbookChannelMessageTypes,
+} from '../types';
+
+import {relayerResponseJsonParsers} from './relayer_response_json_parsers';
+
+export const orderbookChannelMessageParser = {
+    parse(utf8Data: string): OrderbookChannelMessage {
+        const messageObj = JSON.parse(utf8Data);
+        const type: string = _.get(messageObj, 'type');
+        assert.assert(!_.isUndefined(type), `Message is missing a type parameter: ${utf8Data}`);
+        assert.isString('type', type);
+        switch (type) {
+            case (OrderbookChannelMessageTypes.Snapshot): {
+                assert.doesConformToSchema('message', messageObj, schemas.relayerApiOrderbookChannelSnapshotSchema);
+                const orderbookJson = messageObj.payload;
+                const orderbook = relayerResponseJsonParsers.parseOrderbookResponseJson(orderbookJson);
+                return _.assign(messageObj, {payload: orderbook});
+            }
+            case (OrderbookChannelMessageTypes.Update): {
+                assert.doesConformToSchema('message', messageObj, schemas.relayerApiOrderbookChannelUpdateSchema);
+                const orderJson = messageObj.payload;
+                const order = relayerResponseJsonParsers.parseOrderJson(orderJson);
+                return _.assign(messageObj, {payload: order});
+            }
+            default: {
+                return {
+                    type: OrderbookChannelMessageTypes.Unknown,
+                    requestId: 0,
+                    payload: undefined,
+                };
+            }
+        }
+    },
+};