Assign Message - AssignVariable JSON content

Google Cloud Apigee
1

Hi,

I want to save the request body sent to the target server, for latter log. For that I used a AM policy in the postflow of the target

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<AssignMessage async="false" continueOnError="false" enabled="true" name="AM-SetVarsToTarget">
    <IgnoreUnresolvedVariables>true</IgnoreUnresolvedVariables>
    <DisplayName>AM-SetVarsToTarget</DisplayName>
    <AssignVariable>
        <Name>target.request.body</Name>
         <Value>DefaultReq</Value>
        <Ref>message.content</Ref>
    </AssignVariable>
    <AssignVariable>
        <Name>target.request.querystring</Name>
        <Ref>message.querystring</Ref>
    </AssignVariable>
</AssignMessage>

But when I try to use the target.request.body variable in the PostClientFlow, for logging purposes the variable is empty. When using the debug view I see a unequal sign next to the variable

VAP_0-1651865328103.png
VAP_0-1651865328103.png1323×1194 54.1 KB

Any clues of what I’m doing wrong here?

Thanks!

2

YES

The ''unequal" sign means you cannot assign to that variable. (More precisely, it means the assign failed). I believe you want target.request.content.

Can you try assigning to that?

3

Hi @dchiesa1 , yes that worked. I guess its better name my own variables with names that don’t collide with internal apigee vars (e.g. instead of target.request.content use totarget.request.content). Thanks for that.

I now face a different issue related with cloud logging API. The SC on the PostClientFlow is meant to call the GCloud logging API

<ServiceCallout name="SC.CloudLogging">
    <Request>
        <IgnoreUnresolvedVariables>true</IgnoreUnresolvedVariables>
        <Set>
            <Payload contentType="application/json">{
    "logName": "projects/{organization.name}/logs/apigee-runtime",
    "resource" : {
      "type": "api",
      "labels": {}
    },
    "labels": {
        "application": "apigee",
        "proxy":"logging-example"
    },
    "entries": [{
        "severity": "INFO",
        "jsonPayload": {
            "organization": "{organization.name}",
            "environment": "{environment.name}",
            "apiProxy": "{apiproxy.name}",
            "apiProxyRevision": "{apiproxy.revision}",
            "apiProduct": "{apiproduct.name}",
            "developerApp": "{apiproduct.name}",
            "clientId": "{client_id}",
            "developerId": "{developer.id}",
            "requestUri": "{request.uri}",
            "requestUrl": "{request.url}",
            "verb": "{request.verb}",
            "correlationId": "{messageid}",
            "proxyRequestReceived": "{client.received.end.timestamp}",
            "proxyResponseSent": "{client.sent.end.timestamp}",
            "targetResponseReceived": "{target.received.end.timestamp}",
            "targetRequestSent": "{target.sent.end.timestamp}",
            "targetResponseCode": "{message.status.code}",
            "proxyResponseCode": "{response.status.code}",
            "clientReceived": "{client.received.start.timestamp}",
            "clientSent": "{client.sent.start.timestamp}",
            "targetUrl":"{target.url}",
            "target.request.body":"{totarget.request.content}"
            "target.request.querystring":"{totarget.request.querystring}",
            <!--"target.response.body":"{fromtarget.response.content}",-->
            "target.response.status.code":"{fromtarget.response.status.code}",
           <!-- "error.content":"{error.content}",-->
            "error.message":"{error.message}",
            "error.status.code":"{error.status.code}",
            "faultName":"{fault.name}"
        }
    }],
    "partialSuccess": true
  }
            </Payload>
            <Verb>POST</Verb>
        </Set>
    </Request>

    <HTTPTargetConnection>
        <Authentication>
            <GoogleAccessToken>
                <Scopes>
                    <Scope>https://www.googleapis.com/auth/logging.write</Scope>
                </Scopes>
                <LifetimeInSeconds>3600</LifetimeInSeconds>
            </GoogleAccessToken>
        </Authentication>
        <URL>https://logging.googleapis.com/v2/entries:write</URL>
    </HTTPTargetConnection>
</ServiceCallout>

The issue is that every time I try to log the totarget.request.content var to GCloud API, the SC ends with an error. I imagine that’s because I will have JSON inside JSON… If I disable that line the SC ends successfully. Any ideas of how to get this log working?

Thanks!

4

Any ideas of how to get this log working?

yes. If you’re certain that the fromtarget.response.content variable always holds JSON, then you can just eliminate the quotes. Like this:

"target.response.body": {fromtarget.response.content}, <!-- no quotes around this var ref -->

If that variable does not always hold correct json, then you can escape the content with escapeJSON :

"target.response.body": "{escapeJSON(fromtarget.response.content)}", <!-- escaped -->

In the latter case, if it IS JSON, then … it will be embedded as a plain string.

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