Refactor Channels and Streams APIs: Update Member streams type to an array, enhance error handling in publishUri method, and add extractMediaType utility function.

src/apis/Channels.ts

@@ -19,14 +19,12 @@ export type Member = {
   sessionId: string;
   screenName: string;
   role: string;
-  streams: [
-    {
-      type: string;
-      uri: string;
-      audioState: string;
-      videoState: string;
-    }
-  ];
+  streams: {
+    type: string;
+    uri: string;
+    audioState: string;
+    videoState: string;
+  }[];
   state: string;
   lastUpdate: number;
 };
@@ -36,6 +34,16 @@ type GetChannelParams = {
   channelId?: string;
 };
 
+type KillChannelResponse = {
+  status: string;
+  killedMembers: Member[];
+};
+
+type ForkChannelResponse = {
+  status: string;
+  members: Member[];
+};
+
 export class ChannelError extends Error {
   constructor(
     message: string,
@@ -46,16 +54,6 @@ export class ChannelError extends Error {
   }
 }
 
-type KillChannelResponse = {
-  status: string;
-  killedMembers: Member[];
-};
-
-type ForkChannelResponse = {
-  status: string;
-  members: Member[];
-};
-
 export class Channels {
   private readonly _httpRequests: PCastHttpRequests;
   private readonly _channelsByAlias: Map<ChannelAlias, Channel> = new Map();
@@ -195,22 +193,23 @@ export class Channels {
   }
 
   public async getPublishSourceStreamId(channelId: string, retryCount: number = 3): Promise<string | null> {
-    const retryCountRemaining = retryCount || 3;
     const channelMembers = await this.getMembers(channelId);
-
+    console.log('channelMembers [%o] retryCount [%d]', channelMembers, retryCount);
     if (channelMembers.length === 0) {
-      if (retryCountRemaining > 0) {
-        return this.getPublishSourceStreamId(channelId, retryCountRemaining - 1);
+      if (retryCount > 0) {
+
+        return this.getPublishSourceStreamId(channelId, retryCount - 1);
       }
 
       return null;
     }
 
+
     const presenter = channelMembers.find(member => member.role === 'Presenter');
 
     if (!presenter) {
-      if (retryCountRemaining > 0) {
-        return this.getPublishSourceStreamId(channelId, retryCountRemaining - 1);
+      if (retryCount > 0) {
+        return this.getPublishSourceStreamId(channelId, retryCount - 1);
       }
 
       return null;
@@ -218,7 +217,7 @@ export class Channels {
 
     const publishSourceStreamIdRegExp = /pcast:\/\/.*\/([^?]*)/;
 
-    return presenter.streams[0].uri.match(publishSourceStreamIdRegExp)?.[1] ?? null;
+    return presenter.streams[0]?.uri?.match(publishSourceStreamIdRegExp)?.[1] ?? null;
   }
 
   public async fork(sourceChannelId: string, destinationChannelId: string): Promise<ForkChannelResponse> {