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IPC communication between Python and Cadence

Vijay Srini

Hi All,

 I am trying to open a IPC channel between python and cadence. I managed to get one way communication from either to the other, but unable to get two way communication.

 Please help to point me in the right direction!

 

 Thanks in advance,

 

Vijay

Parents

  • I've done it this way:

    Skill:
    pyIpc = ipcBeginProcess("my.py " "" 'myIpcDataHandler 'myIpcErrHandler 'myIpcFinishHandler "/tmp/py.log")
    procedure(myIpcDataHandler(ipcId data)
      let((result)
        ;printf("in myIpcDataHandler with %L\n" data)
        foreach(d parseString(data "\n")
            unless(errset(result=evalstring(d))
                 printf("ERROR: %L\n" errset.errset)
                 ipcWriteProcess(ipcId sprintf(nil "ERROR %L\n" errset.errset))
            ) ; unless
        )
      )
    )

    procedure(myIpcErrHandler(ipcId data)
        println(list("ERROR: myIpcErrHandler called with:" ipcId data))
    )

    procedure(myIpcFinishHandler(ipcId data)
      let((exitStatus)
        printf("Finished at %s: %L %L  " getCurrentTime() ipcId data)
        exitStatus = ipcGetExitStatus(ipcId)
        printf("Return value = %L\n" exitStatus)
        if(exitStatus==0 then
            printf("The IPC call has finished!!\n")
        else
            printf("**ERROR: operation failed\n")
        )
      )
    )

    procedure(mySkillCommand(data)
        println(data)
        ipcWriteProcess(pyIpc "Skill says hello")
    )

    Python file my.py:
    import sys
    data = 'Hello from the Python world'
    sys.stdout.write('mySkillCommand("%s")\n' % data)
    sys.stdout.flush()
    returnData = sys.stdin.readline()
    #Write to a file since stdout goes to Cadence
    outFile = open('/tmp/myPy.out','w')   
    outFile.writelines( returnData )
    outFile.close()

    When done, /tmp/py.log shows commands sent from Python to skill through stdout and /tmp/myPy.out shows the Skill response.

    Derek

Reply

  • I've done it this way:

    Skill:
    pyIpc = ipcBeginProcess("my.py " "" 'myIpcDataHandler 'myIpcErrHandler 'myIpcFinishHandler "/tmp/py.log")
    procedure(myIpcDataHandler(ipcId data)
      let((result)
        ;printf("in myIpcDataHandler with %L\n" data)
        foreach(d parseString(data "\n")
            unless(errset(result=evalstring(d))
                 printf("ERROR: %L\n" errset.errset)
                 ipcWriteProcess(ipcId sprintf(nil "ERROR %L\n" errset.errset))
            ) ; unless
        )
      )
    )

    procedure(myIpcErrHandler(ipcId data)
        println(list("ERROR: myIpcErrHandler called with:" ipcId data))
    )

    procedure(myIpcFinishHandler(ipcId data)
      let((exitStatus)
        printf("Finished at %s: %L %L  " getCurrentTime() ipcId data)
        exitStatus = ipcGetExitStatus(ipcId)
        printf("Return value = %L\n" exitStatus)
        if(exitStatus==0 then
            printf("The IPC call has finished!!\n")
        else
            printf("**ERROR: operation failed\n")
        )
      )
    )

    procedure(mySkillCommand(data)
        println(data)
        ipcWriteProcess(pyIpc "Skill says hello")
    )

    Python file my.py:
    import sys
    data = 'Hello from the Python world'
    sys.stdout.write('mySkillCommand("%s")\n' % data)
    sys.stdout.flush()
    returnData = sys.stdin.readline()
    #Write to a file since stdout goes to Cadence
    outFile = open('/tmp/myPy.out','w')   
    outFile.writelines( returnData )
    outFile.close()

    When done, /tmp/py.log shows commands sent from Python to skill through stdout and /tmp/myPy.out shows the Skill response.

    Derek

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