Websocket (pws://)

A-Stack supports pws protocol Handler, that can be used for websocket connections

PWS Protocol Handler Flow:

PWS Protocol Parameters:

The table below lists all the parameters of pws protocol handler and their description

Usage of PWS protocol handler:

• PWS Get:  the facet given below in for A-Stack Version 1.0.5 or greater.

  PWS GET Facet

  <ThingFacet Name="PWSConnectionFacet">
      <String Format="$ObjectFormat(xml)" KnownBy="PWSConnectionAction" Name="ReceivedData" update="auto"/>
      <String Name="URL"/>
      <Action Name="PWSConnectionAction">
          <Workflow Limit="1" Live="1" Timeout="-1">
              <Task name="Main" while="true">
                  <Event as="ActionArgument" name="Argument"/>
                  <Invoke get="pws://?URL=[%:Event.Argument.URL.Value:%]&amp;" name="InvokePwsSubscription" scope="process" waitFor="Argument">
                      <Headers/>
                      <Cookie/>
                  </Invoke>
                  <Output As="ActionResult" Name="Result">
                      <Value>
                          <ReceivedData>
                              <Include>
  								Invoke.InvokePwsSubscription.Message.Value
                              </Include>
                          </ReceivedData>
                      </Value>
                  </Output>
              </Task>
          </Workflow>
      </Action>
  </ThingFacet>   

  PWS GET Query

  <Query>
      <DeleteAll>
          <PwsGetModel>
              <pwsID ne=""/>
          </PwsGetModel>
      </DeleteAll>
      <Create>
          <PwsGetModel>
              <ReceivedData>$Null()</ReceivedData>
              <URL>ws://localhost:8080/fid-loggerfacet</URL>
          </PwsGetModel>
      </Create>
  </Query>

  PWS POST Facet

  <ThingFacet Name="PwsPostConnectionFacet">
      <String Format="$ObjectFormat(xml)" KnownBy="PwsPostConnectionAction" Name="ReceivedData" update="auto"/>
      <String Name="URL"/>
  	<String Name="Payload"/>
      <Action Name="PwsPostConnectionAction">
          <Workflow Limit="1" Live="1" Timeout="-1">
              <Task name="Main" while="true">
                  <Event as="ActionArgument" name="Argument"/>
                  <Invoke name="InvokePwsSubscription" post="pws://?URL=[%:Event.Argument.URL.Value:%]&amp;" scope="process" waitFor="Argument">
                      <Headers/>
                      <Cookie/>
                      <Message>
                          <Value>[%:Event.Argument.Payload.Value:%]</Value>
                      </Message>
                  </Invoke>
                  <Output As="ActionResult" Name="Result">
                      <Value>
                          <ReceivedData>
                              <Include>
  								Invoke.InvokePwsSubscription.Message.Value
                              </Include>
                          </ReceivedData>
                      </Value>
                  </Output>
              </Task>
          </Workflow>
      </Action>
  </ThingFacet>   

  PWS POST Query

  <Query>
      <DeleteAll>
          <PwsPostModel>
              <pwsID ne=""/>
          </PwsPostModel>
      </DeleteAll>
      <Create>
          <PwsPostModel>
              <ReceivedData>$Null()</ReceivedData>
  			<Payload>Hello World</Payload>
              <URL>ws://localhost:9090</URL>
          </PwsPostModel>
      </Create>
  </Query>

<ReceivedData Value="" Version="1">
	<Known>
		<Data>
			<Log>
				<Level>WARN</Level>
				<Source>SffTcpClient</Source>
				<Timestamp>1481614580958</Timestamp>
				<Message>IO error in SffTqlPolicyFacet:TQL-97069142663125278:http&gt;NioClientSocketChannel[id: 0xc0a611b0]; Caused by: java.net.ConnectException: Connection refused: localhost/127.0.0.1:1212</Message>
			</Log>
		</Data>
	</Known>
</ReceivedData>