Continue sequence mediation after timeout in call mediator - wso2

Question

Endpoints can have three timeout configurations. Never timeout, discard, or fault. I desperately need to continue the flow after a timeout. Is there a way to achieve this? Fault handler (onError sequence) is not a desired solution for this issue. Imagine orchestration with eight call mediators, I would have to create eight sequences and set each other as fault. This would very quickly bloat carbon apps, make code unreadable and increase deployment time.

Answer 1

Basically,at any given time, the state of the endpoint can be one of the following.
Active
Timeout
Suspend
OFF
When an endpoint is in the "Timeout" state, it will continue to attempt to receive messages until one message succeeds or the maximum retry setting has been reached. If the maximum is reached at which point the endpoint is marked as "Suspended." If one message succeeds, the endpoint is marked as "Active."
If you need to continue the mediation flow when you get an endpoint timeout as per the endpoint timeout configuration, you can use the fault option in responseAction.
Then, whenever the endpoint is timeout, the fault sequence (custom fault sequence if you have defined it already, otherwise the default fault sequence) will be hit. If you need to continue the mediation flow and as per the existing implementation, you can define the required mediation logic in a custom sequence and call that sequence in the fault sequence as follows.
<?xml version="1.0" encoding="UTF-8"?>
<sequence name="customFaultSequence" xmlns="http://ws.apache.org/ns/synapse">
<!-- Log the message at the full log level with the ERROR_MESSAGE and the ERROR_CODE-->
<log level="full">
<property name="MESSAGE" value="Executing default 'fault' sequence"/>
<property expression="get-property('ERROR_CODE')" name="ERROR_CODE" xmlns:ns="http://org.apache.synapse/xsd"/>
<property expression="get-property('ERROR_MESSAGE')" name="ERROR_MESSAGE" xmlns:ns="http://org.apache.synapse/xsd"/>
</log>
<sequence key="afterTimeoutEndpointSequence"/>
</sequence>
Sample proxy service:
<?xml version="1.0" encoding="UTF-8"?>
<proxy xmlns="http://ws.apache.org/ns/synapse" name="TestProxy" startOnLoad="true" statistics="disable" trace="disable" transports="http,https">
<target faultSequence="customFaultSequence">
<inSequence>
<endpoint>
<address uri="http://run.mocky.io/v3/51c11e65-55a7-47e5-ba38-1d86e8e5d7ea?mocky-delay=45000ms">
<timeout>
<duration>2</duration>
<responseAction>fault</responseAction>
</timeout>
</address>
</endpoint>
<respond/>
</inSequence>
<description/>
</proxy>