Provable/Oraclalize: How to get msg.sender in __callback

How do I get the msg.sender of the user who called randomNumber() in the __callback? pragma solidity ^0.5.11; import “github.com/provable-things/ethereum-api/provableAPI_0.4.25.sol”; contract ExampleContract is usingProvable {  function __callback(bytes32 myid, string result) {   if (msg.sender != provable_cbAddress()) revert();   // how do i get the address of the user who called “randomNumber”?  }  function randomNumber() public {   provable_query(“WolframAlpha”,…

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How to find out witch service is sending an email?

Last week I installed Postfix (only for sending from server) on my Ubuntu 18.04 server. I didn’t prepare any service for sending yet, because I want to clear something. In /var/log/mail.log I see many records, but I can’t find which service is trying to send an email. Dec 1 14:57:45 localhost postfix/qmgr[11433]: 5F1BB4122F: from=<root@website.eu>, size=5664,…

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Temporary Failure in name resolution on WSL

Running Ubuntu on WSL and trying to push to github and download new python modules using pip and I get this error. Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by ‘NewConnectionError(‘<urllib3.connection.VerifiedHTTPSConnection object at 0x7f9d654fe0b8>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution’,)’: /simple/tensorflow/ I had a look at…

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