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Working with WSO2 message tracer
  1. Introduction

    In this document, it will explain how to use wso2 message tracer feature on the carbon-based product. Here we used message tracer feature 1.0.x versions as an example. Also, the document will explain how to install and configure message tracer on your wso2 product.

  2. What is message tracing

    Message tracing is an identification of each message flow in each transaction which is going through message gateway.

  3. Why message tracing

    Message tracing is used to debug, audit, logging and debug messages content and it’s the direction. This is very useful when you want to track all message and its flow of the same transaction.

  4. Install message tracer feature

    Message tracer feature is part of the carbon-analytics and you can find the message tracer source code from here.

    Message tracer can be installed into your wso2 product as a feature from feature repo.

    You can use available feature repose based on the carbon-kernel platform.

    For 4.2.x kernel: http://product-dist.wso2.com/p2/carbon/releases/turing/

    For 4.4.x kernel: http://product-dist.wso2.com/p2/carbon/releases/wilkes/

    Also, you can build the feature repose by yourself on your local setup and point feature repo location as the file path. Here the git location for the source https://github.com/wso2/carbon-feature-repository

    Next, try to install feature on the product. Here i used the wso2 apim 2.0.0

      • Start the APIM 2.0.0
      • Go to the features section in the “Main” -> “Configure” menu
      • Click add the repository and set the path to the p2-repo and set name for the repo
      • Then click “Add” to add the repository
      • Next, select the p2-repo to search message tracer feature under the tab “Available Features”
      • Enter “Message” for “Filter by feature name” field and click “find features” button
      • Then You can see the available message tracer feature
    • Check version you wish to install and click install
    • Continue with the installation process and restart APIM changes to take effect
  5. Configure message tracer

    After feature installation done, go to “Configure” -> “Message Tracing” section from the left menu

    Check “Enable Message Tracing” option to enable message tracing and click update

    Select following option as you desire to configure message tracer

    • Dump Message Content
      • Check this option to enable message tracing for the content of the message as well
    • Enable Logging
      • Check the option to enable logging into the available logging handler to log the tracing message
    • Enable BAM Event Publishing
      • Check this option to publish tracing event to WSO2 DAS
  6. Publishing events to DAS

    Check “Enable BAM Event Publishing” option to enable DAS data publishing

    In order to publish the event to DAS you should configure following configuration on APIM and DAS.

    Event stream definition should be configured in DAS in order to receive an event.

    • Once you save the changes, in APIM will generate stream definition in <APIIM_HOM>/repository/deployment/server/eventstreams/BAM_MESSAGE_TRACE_1.0.0.json
    • Or you can use the following stream definition
    • To deploy the same definition you can copy above json to <DAS_HOME>/repository/deployment/server/eventstreams/BAM_MESSAGE_TRACE_1.0.0.json

    Also, event stream should be persistent in order to save event on Tables.

      • Once you deploy stream definition and restarted, you can find the stream you deployed under “streams” section of “Main” -> “Event” menu
      • To persist event stream edit the stream definition.
      • Then select “Next [Persist Event]” button at the bottom in the edit page
      • Then check “Persist Event Stream” and check all the attributes after it.
      • Then click “save event stream button” to persist event
      • And finally, you should configure the event receiver to point stream to persistent tables
      • For that go to “Main” -> “Event” -> “receivers” to add a receiver like below

    Next APIM should configure for a publisher in order to publish an event to DAS

      • Go APIM, “publishers” section of “Main” -> “Event” menu
      • Click “add” event publisher
      • Set name for the data publisher
      • Select BAM_MESSAGE_TRACER:1.0.0 stream from event source
      • Select “wso2event” from “Output Event Adapter Type”
      • Then set the DAS event receiver configuration as below
  7. Results
      • After the logging enabled, you can see the log message from APIM console as below
    [2016-06-11 09:48:01,901]  INFO - HandlerUtils Massage Info: Transaction id=1401719621988766713213  Message direction=IN  Server name=172.16.2.136:9763  Timestamp=1465618681901  Service name=__SynapseService  Operation Name=mediate
    [2016-06-11 09:48:01,903]  INFO - HandlerUtils Massage Info: Transaction id=1401719621988766713213  Message direction=OUT  Server name=172.16.2.136:9763  Timestamp=1465618681903  Service name=__SynapseService  Operation Name=mediate
    [2016-06-11 09:48:01,909]  INFO - HandlerUtils Massage Info: Transaction id=140172037238671183803  Message direction=IN  Server name=172.16.2.136:9763  Timestamp=1465618681909  Service name=__SynapseService  Operation Name=mediate
    [2016-06-11 09:48:01,917]  INFO - HandlerUtils Massage Info: Transaction id=140172037238671183803  Message direction=OUT  Server name=172.16.2.136:9763  Timestamp=1465618681917  Service name=__SynapseService  Operation Name=mediate
      • when you configured DAS data publishing you can find the event data from DAS data-exporer like below
2016-06-26 05:44:15 | Rukshan Chathuranga

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