Merge pull request #236 from ihors-livestorm/feat/add-broadcasts-list

feat: add `Listing live streaming broadcasts` support

lib/opentok/broadcast_list.rb

@@ -0,0 +1,14 @@
+require "opentok/broadcast"
+
+module OpenTok
+  # A class for accessing an array of Broadcast objects.
+  class BroadcastList < Array
+    # The total number of broadcasts.
+    attr_reader :total
+
+    def initialize(interface, json)
+      @total = json["count"]
+      super json["items"].map { |item| ::OpenTok::Broadcast.new interface, item }
+    end
+  end
+end

lib/opentok/broadcasts.rb

@@ -1,6 +1,6 @@
 require "opentok/client"
 require "opentok/broadcast"
-
+require "opentok/broadcast_list"
 
 module OpenTok
   # A class for working with OpenTok live streaming broadcasts.
@@ -95,6 +95,25 @@ def find(broadcast_id)
       Broadcast.new self, broadcast_json
     end
 
+    # Returns a BroadcastList, which is an array of broadcasts that are completed and in-progress,
+    # for your API key.
+    #
+    # @param [Hash] options  A hash with keys defining which range of broadcasts to retrieve.
+    # @option options [integer] :offset Optional. The index offset of the first broadcast. 0 is offset
+    #   of the most recently started broadcast. 1 is the offset of the broadcast that started prior to
+    #   the most recent broadcast. If you do not specify an offset, 0 is used.
+    # @option options [integer] :count Optional. The number of broadcasts to be returned. The maximum
+    #   number of broadcasts returned is 1000.
+    # @option options [String] :session_id Optional. The session ID that broadcasts belong to.
+    # https://tokbox.com/developer/rest/#list_broadcasts
+    #
+    # @return [BroadcastList] An BroadcastList object, which is an array of Broadcast objects.
+    def all(options = {})
+      raise ArgumentError, "Limit is invalid" unless options[:count].nil? || (0..1000).include?(options[:count])
+
+      broadcast_list_json = @client.list_broadcasts(options[:offset], options[:count], options[:sessionId])
+      BroadcastList.new self, broadcast_list_json
+    end
 
     # Stops an OpenTok broadcast
     #

lib/opentok/client.rb

@@ -483,6 +483,28 @@ def stop_broadcast(broadcast_id)
       raise OpenTokError, "Failed to connect to OpenTok. Response code: #{e.message}"
     end
 
+    def list_broadcasts(offset, count, session_id)
+      query = Hash.new
+      query[:offset] = offset unless offset.nil?
+      query[:count] = count unless count.nil?
+      query[:sessionId] = session_id unless session_id.nil?
+      response = self.class.get("/v2/project/#{@api_key}/broadcast", {
+        :query => query.empty? ? nil : query,
+        :headers => generate_headers,
+      })
+      case response.code
+      when 200
+        response
+      when 403
+        raise OpenTokAuthenticationError,
+          "Authentication failed while retrieving broadcasts. API Key: #{@api_key}"
+      else
+        raise OpenTokBroadcastError, "The broadcasts could not be retrieved."
+      end
+    rescue StandardError => e
+      raise OpenTokError, "Failed to connect to OpenTok. Response code: #{e.message}"
+    end
+
     def layout_broadcast(broadcast_id, opts)
       opts.extend(HashExtensions)
       response = self.class.put("/v2/project/#{@api_key}/broadcast/#{broadcast_id}/layout", {

lib/opentok/version.rb

@@ -1,4 +1,4 @@
 module OpenTok
   # @private
-  VERSION = '4.3.0'
+  VERSION = '4.2.0'
 end

sample/Broadcast/README.md

@@ -168,6 +168,48 @@ You will now see the participant in the broadcast.
   end
 ```
 
+### All broadcasts
+
+Start by visiting the list page at <http://localhost:4567/all>. You will see a table that
+displays all the broadcasts created with your API Key. If there are more than five, the next ones
+can be seen by clicking the "Next →" link. Some basic information like
+when the broadcast was created, how long it is, and its status is also shown. You should see the
+broadcasts you created in the previous sections here.
+
+We begin to see how this page is created by looking at the route handler for this URL:
+
+```ruby
+  get '/all' do
+    page = (params[:page] || "1").to_i
+    offset = (page - 1) * 5
+    broadcasts = settings.opentok.broadcasts.all(:offset => offset, :count => 5)
+
+    show_previous = page > 1 ? '/all?page=' + (page-1).to_s : nil
+    show_next = broadcasts.total > (offset + 5) ? '/all?page=' + (page+1).to_s : nil
+
+    erb :all, :locals => {
+      :broadcasts => broadcasts,
+      :show_previous => show_previous,
+      :show_next => show_next
+    }
+  end
+```
+
+This view is paginated so that we don't potentially show hundreds of rows on the table, which would
+be difficult for the user to navigate. So this code starts by figuring out which page needs to be
+shown, where each page is a set of 5 broadcasts. The `page` number is read from the request's query
+string parameters as a string and then converted into an Integer. The `offset`, which represents how
+many broadcasts are being skipped is always calculated as five times as many pages that are less than
+the current page, which is `(page - 1) * 5`. Now there is enough information to ask for a list of
+broadcasts from OpenTok, which we do by calling the `broadcasts.all()` method of the `opentok` instance.
+The parameter is an optional Hash that contains the offset, the count (which is always 5 in this
+view). If we are not at the first page, we can pass the view a string that contains the relative URL
+for the previous page. Similarly, we can also include one for the next page. Now the application
+renders the view using that information and the partial list of broadcasts.
+
+At this point the template file `views/all.erb` handles looping over the array of broadcasts and
+outputting the proper information for each column in the table.
+
 ### Changing the layout classes for streams
 
 In the host page, if you click on either the host or a participant video, that video gets

sample/Broadcast/broadcast_sample.rb

@@ -46,6 +46,21 @@ class BroadcastSample < Sinatra::Base
     }
   end
 
+  get '/all' do
+    page = (params[:page] || "1").to_i
+    offset = (page - 1) * 5
+    broadcasts = settings.opentok.broadcasts.all(:offset => offset, :count => 5)
+
+    show_previous = page > 1 ? '/all?page=' + (page-1).to_s : nil
+    show_next = broadcasts.total > (offset + 5) ? '/all?page=' + (page+1).to_s : nil
+
+    erb :all, :locals => {
+      :broadcasts => broadcasts,
+      :show_previous => show_previous,
+      :show_next => show_next
+    }
+  end
+
   post '/start' do
     opts = {
         :maxDuration => params.key?("maxDuration") ? params[:maxDuration] : 7200,

sample/Broadcast/views/all.erb

@@ -0,0 +1,46 @@
+  <div class="container bump-me">
+
+    <div class="body-content">
+
+      <div class="panel panel-default">
+        <div class="panel-heading">
+          <h3 class="panel-title">Broadcasts List</h3>
+        </div>
+        <div class="panel-body">
+          <% if broadcasts.count > 0 %>
+          <table class="table">
+            <thead>
+              <tr>
+                <th>Created</th>
+                <th>Status</th>
+              </tr>
+            </thead>
+            <tbody>
+              <% for item in broadcasts %>
+
+              <tr data-item-id="<%= item.id %>">
+                <td><%= Time.at(item.created_at/1000).strftime("%B %e, %Y at %I:%M %p") %></td>
+                <td><%= item.status %></td>
+              </tr>
+
+              <% end %>
+            </tbody>
+          </table>
+          <% else %>
+          <p>
+            There are no broadcasts currently. Try making one in the <a href="/host">host view</a>.
+          </p>
+          <% end %>
+        </div>
+        <div class="panel-footer">
+          <% if show_previous %>
+            <a href="<%= show_previous %>" class="pull-left">&larr; Previous</a>
+          <% end %>
+          &nbsp;
+          <% if show_next %>
+            <a href="<%= show_next %>" class="pull-right">Next &rarr;</a>
+          <% end %>
+        </div>
+      </div>
+    </div>
+  </div>

sample/Broadcast/views/index.erb

@@ -25,8 +25,23 @@
           </div>
 
         </div>
+        <div class="col-lg-6 col-offset-1">
+
+          <div class="panel panel-default">
+            <div class="panel-heading">List of Broadcasts</div>
+            <div class="panel-body">
+              <p>
+                Click through to List of Broadcasts to see examples of using the
+                Broadcasting REST API to list broadcasts showing status (started,
+                stopped, available) and created at timestamp.
+              </p>
+            </div>
+            <div class="panel-footer">
+              <a class="btn btn-success" href="all">List of Broadcasts</a>
+            </div>
+          </div>
 
     </div>
 
   </div>
-</div>
+</div>