Support for register using a seed host (#51)

src/registrar.ts

@@ -1,19 +1,38 @@
 import axios from "axios";
+import _ from "underscore";
 import logger from "./logger";
-import sonos, { bonobService } from "./sonos";
+import sonos, { bonobService, Discovery } from "./sonos";
 import { URLBuilder } from "./url_builder";
 
-export default (bonobUrl: URLBuilder) => async () => {
-  const about = bonobUrl.append({ pathname: "/about" });
-  logger.info(`Fetching bonob service about from ${about}`);
-  return axios
-    .get(about.href())
-    .then((res) => {
-      if (res.status == 200) return res.data;
-      else throw `Unexpected response status ${res.status} from ${about}`;
-    })
-    .then((about) =>
-      bonobService(about.service.name, about.service.sid, bonobUrl)
-    )
-    .then((bonobService) => sonos(true).register(bonobService));
-};
+export default (
+    bonobUrl: URLBuilder,
+    sonosDiscovery: Discovery = {
+      auto: true,
+      seedHost: undefined,
+    }
+  ) =>
+  async () => {
+    const about = bonobUrl.append({ pathname: "/about" });
+    logger.info(`Fetching bonob service about from ${about}`);
+    return axios
+      .get(about.href())
+      .then((res) => {
+        if (res.status == 200) return res.data;
+        else throw `Unexpected response status ${res.status} from ${about}`;
+      })
+      .then((res) => {
+        const name = _.get(res, ["service", "name"]);
+        const sid = _.get(res, ["service", "sid"]);
+        if (!name || !sid) {
+          throw `Unexpected response from ${about.href()}, expected service.name and service.sid`;
+        }
+        return {
+          name,
+          sid: Number.parseInt(sid),
+        };
+      })
+      .then(({ name, sid }: { name: string; sid: number }) =>
+        bonobService(name, sid, bonobUrl)
+      )
+      .then((service) => sonos(sonosDiscovery).register(service));
+  };