Newline character in KVM

Google Cloud Apigee
1

Hi,

I have a value in KVM with ‘\n’ a newline character. When I retrieve the value from KVM and pass it to Javascript it is not getting processed as newline.

When I give the same value as a string variable in javascript with ‘\n’ the newline character is processsed and working fine.

I want to know a way when I retrieve the value from KVM the newline character is proccessed before I pass it to another library.

Thanks,

Chaitanya.

1 Like
2

Hi Chaitanya

I just tried this and … it works for me!

I suspect you’re having trouble encoding and storing the value.

I have stored in the KVM a value with a \n. I did this via the API… When I invoke the API call, the string contains a slash character, followed by a n character. It looks like this:

curl -X POST $mgmtserver/v1/o/$org/e/$env/keyvaluemaps/$mapname/entries/test-key -H content-type:application/json -d '{
  "name" : "test-key",
  "value" : "test-value 20170803-144830\nThis is line #2\nThis is line #3"
}'

Then, in the API proxy, I include a KVM Get policy configured like so:

<KeyValueMapOperations name="KVM-Get-1" mapIdentifier="NonSecrets">
    <DisplayName>KVM-Get-1</DisplayName>
    <ExpiryTimeInSecs>10</ExpiryTimeInSecs>
    <Get assignTo="myVariable">
        <Key>
            <Parameter>test-key</Parameter>
        </Key>
    </Get>
    <Scope>environment</Scope>
</KeyValueMapOperations>

And then in the response flow, I have an AssignMessage policy, configured like this:

<AssignMessage name="Assign-Message-1">
    <DisplayName>Assign Message-1</DisplayName>
    <Remove>
        <Headers/>
    </Remove>
    <Set>
        <Payload contentType="text/plain">{myVariable}</Payload>
    </Set>
    <IgnoreUnresolvedVariables>true</IgnoreUnresolvedVariables>
    <AssignTo createNew="false" transport="http" type="response"/>
</AssignMessage>

The output is like this:

$ curl -i [https://${org}-${env}.apigee.net/retrieve-kvm-multiline](https://${org}-${env}.apigee.net/retrieve-kvm-multiline)
HTTP/1.1 200 OK
Date: Thu, 03 Aug 2017 21:46:29 GMT
Content-Type: text/plain
Content-Length: 58
Connection: keep-alive
Server: Apigee Router

test-value 20170803-144830
This is line #2
This is line #3

This shows that multiple lines are in the retrieved value.

When I run a JS callout like this:

 var value = context.getVariable('myVariable');
 var lines = value.split('\n');
 context.setVariable('line_count', lines.length.toFixed(0));

…the line_count variable gets the value ‘3’. This shows that the JS callout “sees” the multiple lines.

There is one problem - the Apigee Edge UI does not properly show the newlines in the Web page.

5412-screenshot-20170803-145454.png

This is a UI bug. But at runtime it behaves properly.

1 Like
3

Thanks dino. I tried storing the values in the KVM using the mangement APIs instead of the UI and it worked.

4

Right on! Thanks for letting me know. I’ll get the UI bug logged, and see if I can have it fixed quickly.

Edit

Ok, I’ve filed bug #64612551 to track this UI problem.