将来自 2 个不同处理器的内容和属性传递给 InvokeHttp 处理器

Question

Here is what i am trying to do

1. Get a file and encode it to base 64
2. Login to API and get OAUTH token for subsequent API calls (Since Invoke HTTP doesnt take a body so i have to pass a body using GenerateFlow processor before that)

Both Steps 1 and 2 are interchangeable

3. Now i need the token from the login call as Header value and Base64 encoded file as the body to the next Invoke Processor.

The problem is i am not able to connect the flows 1 and 2 so i can take them to step 3 where i need to invoke another API using the data from the 2. Both GetFile and GenerateFlow are source processors.

Here is what i am thinking, to somehow convert the content to attribute. Since the file is encoded in base64, is there a way i can convert that content to attribute? i am trying to but the content is just random text, i am not sure what param to look for or what i need to put that to. is there a way to say convert whatever is in the content to an attribute say filecontent="all the flow-content"

nifi-flow-snapshot

Base 64 encoded content

Answer 1

1. First trigger both flow fro mthe same generateflowfie >> updateattribute(create common attribute to be used in merge correlation).
2. Do your work
3. Use MergeContent - keep all unique attribute - Set correlaion using the common attribute set in out first step.

Answer 2

This is how i resolved my issue for now. There may be other better ways but this one worked. Start the flow with

GetFile>>Base64Encode>>ExtractText>>ReplaceText>>Login>>continue

with rest of the flow

The trick that work was to place the ReplaceText so it can grab the entire base64 encoded content and place it in an attribute. then ReplaceText will replace the entire content with the body of the login processor. Now i have both login token and base 64 encoded file which i can send to my next processors.

Thanks