Accessing server and mule context objects in Data weave - mule-component

Question

I'm trying to access server and mule version info in DW however I get the below message.
DWL looks like below. Please let me know if I'm making any mistakes below. I have tried both the syntaxes to access it.
%dw 1.0
%output application/json
---
{
errorType : payload.errorType,
env: server['host'],
host: server['host'],
ip: server['ip'],
javaVersion: server['javaVersion'],
javaVendor: server['javaVendor'],
osName: server['osName'],
osVersion: server['osVersion'],
muleVersion: mule.version,
clusterId: mule.clusterId,
nodeId: mule.nodeId
}
Message : Exception while executing:
env: server['host'],
^
There is no variable named 'server'.
Payload : {correlationId=046b6c7f-0b8a-43b9-b35d-6489e6daee91, message=This is the test message to test structured log, errorType=ERROR, applicationName=common wrappers - logging wrapper}
Payload Type : java.util.HashMap
Element : /wrapper-logger/processors/1 # common-wrappers:wrapper-logger.xml:16 (Transform Message)
Element XML : <dw:transform-message doc:name="Transform Message" metadata:id="38c29630-7d7c-48fc-a692-2407d0105cab">
<dw:input-payload doc:sample="sample_data\list_HashMap.dwl"></dw:input-payload>
<dw:set-payload>%dw 1.0%output application/json---{errorType : payload.errorType,env: server['host'],host: server['host'],ip: server['ip'],javaVersion: server['javaVersion'],javaVendor: server['javaVendor'],osName: server['osName'],osVersion: server['osVersion'],muleVersion: mule.version,clusterId: mule.clusterId,nodeId: mule.nodeId,applicationName : payload.applicationName,correlationId: payload.correlationId,correlationSequence: "To be decided",correlationGroupSize: 5,timeZone: server.timeZone,timeStamp: server.dateTime,muleFlow: "get-user-record",stackTrace: "A complete Stack Trace",message: payload.message}</dw:set-payload>
</dw:transform-message>
--------------------------------------------------------------------------------
Root Exception stack trace:
com.mulesoft.weave.mule.exception.WeaveExecutionException: Exception while executing:
env: server['host'],
^
There is no variable named 'server'.
at com.mulesoft.weave.mule.exception.WeaveExecutionException$.apply(WeaveExecutionException.scala:10)

Answer 1

You can define a Global function to get the server details and call it from dataweave.
<configuration doc:name="Configuration">
<expression-language>
<import class = "org.mule.util.NetworkUtils"/>
<import class="java.lang.System" />
<global-functions>
def getServerDetails() {
String ip = NetworkUtils.getLocalHost().getHostAddress();
String name = NetworkUtils.getLocalHost().getHostName();
String osName = System.getProperty("os.name");
String osVersion = System.getProperty("os.version");
String javaVersion = System.getProperty("java.version");
String javaVendor = System.getProperty("java.vendor");
return [ip, name, osName, osVersion, javaVersion, javaVendor];
}
</global-functions>
</expression-language>
</configuration>
Calling from dataweave
{
ip: getServerDetails()[0],
host: getServerDetails()[1],
osName: getServerDetails()[2],
osVersion: getServerDetails()[3],
javaVersion: getServerDetails()[4],
javaVendor: getServerDetails()[5]
}