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Product observability enables rapid debugging of product issues. WSO2 Identity Server (WSO2 IS) facilitates product observability by logging the time taken for LDAP and JDBC database calls. This helps to track down any latencies caused by database calls in an instance. The request calls and response calls are correlated via a correlation ID that is sent in the request call.

By default, product observability is not enabled as it impacts on the product's performance.

Let's explore the following topics to learn more: 

Configuring product observability

The configurations are two-fold:

log4j configs

Follow the steps below to set up the correlation logs related to the database calls.

  1. Open the log4j.properties file in the <IS_HOME>/repository/conf directory.
  2. Add the following code to it.

    # Appender config to put correlation Log.
    log4j.logger.correlation=INFO, CORRELATION
    log4j.additivity.correlation=false
    log4j.appender.CORRELATION=org.apache.log4j.RollingFileAppender
    log4j.appender.CORRELATION.File=${carbon.home}/repository/logs/${instance.log}/correlation.log
    log4j.appender.CORRELATION.MaxFileSize=10MB
    log4j.appender.CORRELATION.layout=org.apache.log4j.PatternLayout
    log4j.appender.CORRELATION.Threshold=INFO
    log4j.appender.CORRELATION.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS}|%X{Correlation-ID}|%t|%m%n

Tomcat valve configs

Follow the steps below to set up the correlation ID mapping between the request database call and the response database call.

  1. Open the catalina-server.xml file in the <IS_HOME>/repository/conf/tomcat directory.
  2. Add the following value under the <Host> tag.

    <Valve className="org.wso2.carbon.tomcat.ext.valves.RequestCorrelationIdValve"
                           headerToCorrelationIdMapping="{'activityid':'Correlation-ID'}" queryToCorrelationIdMapping="{'RelayState':'Correlation-ID'}"/>

    This should be the first valve under the <Host> tag.

Enabling observability

Follow the steps below to enable product observability.

  1. Navigate to the <IS_HOME>/bin directory on the command prompt. 

    cd <IS_HOME>/bin
  2. To set the -DenableCorrelationLogs property to true, execute the following command.  

    For Mac/Linux 	--> sh wso2server.sh -DenableCorrelationLogs=true start
    For Windows		--> wso2server.bat -DenableCorrelationLogs=true start

    By default, this property is set to false.

  3. Navigate to the <IS_HOME>/repository/logs directory.

    cd <IS_HOME>/repository/logs

    Notice that a separate log file called correlation.log is created.

Now you are ready to test the product observability of WSO2 IS.

In order to test product observability, make sure you create a service provider and generate client key and client secret, with which you can perform a secure database call. For more information on creating service providers, see Adding a Service Provider.

Log patterns

Following are the log patterns that support product observability.

JDBC database call logging

Format:

timestamp | correlationID | threadID | duration | callType | startTime | methodName | query | connectionUrl 

Example:

2018-10-22 17:54:46,869|cf57a4a6-3ba7-46aa-8a2b-f02089d0172c|http-nio-9443-exec-2|4|jdbc|1540211086865|executeQuery|SELECT ID, TENANT_ID, IDP_ID, PROVISIONING_CONNECTOR_TYPE, IS_ENABLED, IS_BLOCKING  FROM IDP_PROVISIONING_CONFIG WHERE IDP_ID=?|jdbc:mysql://localhost:13306/apimgtdb?autoReconnect=true&useSSL=false

LDAP database call logging

Format:

timestamp | correlationID | threadID | duration | callType | startTime | methodName | providerUrl | principal | argsLengeth | args

Example:

2018-10-2310:55:02,279|c4eaede8-914d-4712-b630-73f6534b8def|http-nio-9443-exec-18|19|ldap|1540272302260|search|ldap://localhost:10392|uid=admin,ou=system| ou=Users,dc=wso2,dc=org,(&(objectClass=person)(uid=admin)),javax.naming.directory.SearchControls@6359ae3a

Beginning of the request call

Main:

timestamp | correlationID | threadID | duration | HTTP-In-Request | startTime | methodName | requestQuery | requestPath

Example:

2018-11-0514:57:06,757|f884a93d-e3a3-431f-a1ea-f6973e125cb6|http-nio-9443-exec-28|0|HTTP-In-Request|1541410026757|GET|null|/carbon/admin/images/favicon.ico

Ending of the request call

Format:

timestamp | correlationID | threadID | totalDurationForRequest | HTTP-In-Response | startTime | methodName | requestQuery | requestPath

Example:

2018-11-05 14:57:06,764|f884a93d-e3a3-431f-a1ea-f6973e125cb6|http-nio-9443-exec-28|7|HTTP-In-Response|1541410026764|GET|null|/carbon/admin/images/favicon.ico

Reading the logs

Let's analyze the following sample log lines to find if there are any timing delays for the JDBC or LDAP calls.

2018-11-0514:05:18,427|86b56b19-7872-4e2f-84f3-5a14f92e18c1|http-nio-9443-exec-8|0|HTTP-In-Request|1541406918427|POST|null|/carbon/admin/login_action.jsp
2018-11-0514:05:18,581|86b56b19-7872-4e2f-84f3-5a14f92e18c1|http-nio-9443-exec-8|0|jdbc|1541406918581|executeQuery|SELECT * FROM IDN_RECOVERY_DATA WHERE USER_NAME = ? AND USER_DOMAIN = ? AND TENANT_ID = ?|jdbc:h2:./repository/database/WSO2CARBON_DB
2018-11-0514:05:18,591|86b56b19-7872-4e2f-84f3-5a14f92e18c1|http-nio-9443-exec-8|7|ldap|1541406918584|initialization|ldap://localhost:10389|uid=admin,ou=system|0|empty
2018-11-0514:05:18,599|86b56b19-7872-4e2f-84f3-5a14f92e18c1|http-nio-9443-exec-8|200|ldap|1541406918591|search|ldap://localhost:10389|uid=admin,ou=system|3| uid=admin,ou=Users,dc=WSO2,dc=ORG,(&(objectClass=person)(uid=admin)),javax.naming.directory.SearchControls@548e9a48
2018-11-0514:05:18,610|86b56b19-7872-4e2f-84f3-5a14f92e18c1|http-nio-9443-exec-8|0|jdbc|1541406918610|executeQuery|SELECT DATA_KEY, DATA_VALUE FROM IDN_IDENTITY_USER_DATA WHERE TENANT_ID = ? AND USER_NAME = ?|jdbc:h2:./repository/database/WSO2CARBON_DB
2018-11-0514:05:18,632|86b56b19-7872-4e2f-84f3-5a14f92e18c1|http-nio-9443-exec-8|16|ldap|1541406918616|initialization|ldap://localhost:10389|uid=admin,ou=system|0|empty
2018-11-0514:05:18,641|86b56b19-7872-4e2f-84f3-5a14f92e18c1|http-nio-9443-exec-8|0|jdbc|1541406918641|executeQuery|SELECT UM_ROLE_NAME, UM_RESOURCE_ID, UM_IS_ALLOWED, UM_ACTION, UM_DOMAIN_NAME FROM UM_PERMISSION, UM_ROLE_PERMISSION, UM_DOMAIN WHERE UM_ROLE_PERMISSION.UM_PERMISSION_ID=UM_PERMISSION.UM_ID AND UM_ROLE_PERMISSION.UM_DOMAIN_ID=UM_DOMAIN.UM_DOMAIN_ID AND UM_PERMISSION.UM_TENANT_ID=? AND UM_ROLE_PERMISSION.UM_TENANT_ID=?|jdbc:h2:./repository/database/WSO2CARBON_DB
2018-11-0514:05:18,642|86b56b19-7872-4e2f-84f3-5a14f92e18c1|http-nio-9443-exec-8|0|jdbc|1541406918642|executeQuery|SELECT UM_USER_NAME, UM_RESOURCE_ID, UM_IS_ALLOWED, UM_ACTION FROM UM_PERMISSION, UM_USER_PERMISSION WHERE UM_USER_PERMISSION.UM_PERMISSION_ID=UM_PERMISSION.UM_ID AND UM_PERMISSION.UM_TENANT_ID=? AND UM_USER_PERMISSION.UM_TENANT_ID=?|jdbc:h2:./repository/database/WSO2CARBON_DB
2018-11-0514:05:18,696|86b56b19-7872-4e2f-84f3-5a14f92e18c1|http-nio-9443-exec-8|0|jdbc|1541406918696|executeQuery|SELECT UM_RESOURCE_ID FROM UM_PERMISSION WHERE UM_ACTION=? AND UM_TENANT_ID=?|jdbc:h2:./repository/database/WSO2CARBON_DB
2018-11-0514:05:18,715|86b56b19-7872-4e2f-84f3-5a14f92e18c1|http-nio-9443-exec-8|480|HTTP-In-Response|1541406918715|POST|null|/carbon/admin/login_action.jsp
  1. Line 1 is the http-in-request.
  2. Line 10 is the http-in-response, which shows that the total time taken for the cycle is 480 ms. This is almost close to half a second. With that we can assume that there is a delay with either an LDAP or JDBC call.
  3. When we carefully analyze each line, we can see that all JDBC calls have taken less than 5 ms.
  4. Line 4 however, indicates an LDAP call that has taken 200 ms, which can be a possible reason for this issue.

Advanced scenarios

Following are a few advance scenarios that are related to product observability in WSO2 IS.

Blacklisting the threads

Certain threads continuously print unnecessary logs. Blacklisting prevents the unwanted threads from printing logs thereby improving the readability of the logs.

Follow the steps below to configure thread blacklisting.

  1. Open either of the following files in the <IS_HOME>/bin directory on a command prompt.
    1. For Mac/Linux: wso2server.sh file
    2. For Windows: wso2server.bat file
  2. Add the following configuration as a system property.

    -Dorg.wso2.CorrelationLogInterceptor.BlacklistedThreads=threadName1,threadName2 \

    Make sure to add it before the org.wso2.carbon.bootstrap.Bootstrap $* line.

    This configuration is not required by default, as all unnecessary threads are already blacklisted by the MessageDeliveryTaskThreadPool thread. If the above configuration is added, the default value will be overridden.

  3. Restart the WSO2 IS server.

    sh wso2server.sh -DenableCorrelationLogs=true stop
    sh wso2server.sh -DenableCorrelationLogs=true start

Single header configs

By default, RequestCorrelationIdValve in the catalina-server.xml file in the <IS_HOME>/repository/conf/tomcat directory is configured to map to the value sent by the activityid header as the Correlation ID. You can change this by editing the RequestCorrelationIdValve by replacing the activityid with any other headerName that you will be sending.

Let's consider an authentication request that is sent with a new header configuration.

  1. Change the RequestCorrelationIdValve in the cataline-server.xml file to the value given below.

    <Valve className="org.wso2.carbon.tomcat.ext.valves.RequestCorrelationIdValve"
                          headerToCorrelationIdMapping="{'customHeader':'Correlation-ID'}" queryToCorrelationIdMapping="{'RelayState':'Correlation-ID'}"/>
  2. Restart the WSO2 IS Server.

    sh wso2server.sh -DenableCorrelationLogs=true stop
    sh wso2server.sh -DenableCorrelationLogs=true start
  3. To send the authentication request, execute the following cURL command.

    curl -v -k -X POST --basic -u <CLIENT_KEY>:<CLIENT_SECRET> -H "Content-Type: application/x-www-form-urlencoded;charset=UTF-8" -H "customHeader:correlationvalue" -d "grant_type=client_credentials" https://localhost:9443/oauth2/token

    Use the  client key  and  client secret  of the service provider you created after enabling product observability

  4. Open the correlation.log on a command prompt and notice the related logs.

    tail -f ../repository/logs/correlation.log

Multiple header configs

Even though the default configuration maps a single header to a single Correlation ID, it is possible to add multiple headers and map them to multiple Correlation IDs.

Let's consider an authentication request that is sent with multiple headers.

  1. Change the RequestCorrelationIdValve in the cataline-server.xml file to the value given below.

    <Valve className="org.wso2.carbon.tomcat.ext.valves.RequestCorrelationIdValve"
                          headerToCorrelationIdMapping="{'customHeader1':'Correlation-ID', 'customHeader2':'Second-Correlation-ID'}" queryToCorrelationIdMapping="{'RelayState':'Correlation-ID'}"/>
  2. Change the  log4j.appender.CORRELATION.layout.ConversionPattern  appender in the  log4j.properties  file in the  <IS_HOME>/repository/conf/  directory as follows.

    log4j.appender.CORRELATION.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS}|%X{Correlation-ID}|%X{Second-Correlation-ID}|%t|%m%n
  3. Restart the WSO2 IS server.

    sh wso2server.sh -DenableCorrelationLogs=true stop
    sh wso2server.sh -DenableCorrelationLogs=true start
  4. To send the authentication request, execute the following cURL command.

    curl -v -k -X POST --basic -u <CLIENT_KEY>:<CLIENT_SECRET> -H "Content-Type: application/x-www-form-urlencoded;charset=UTF-8" -H "customHeader1:correlationvalue1" -H "customHeader2:correlationvalue2" -d "grant_type=client_credentials" https://localhost:9443/oauth2/token

    Use the  client key  and  client secret  of the service provider you created after enabling product observability

  5. Open the correlation.log on a command prompt and notice the related logs.

    tail -f ../repository/logs/correlation.log

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