How to interact with CPChain?¶
You can utilize
cpc_fusion to interact with CPChain in a python interpreter.
>>> from cpc_fusion import Web3 >>> cf = Web3(Web3.HTTPProvider('http://127.0.0.1:8501')) >>> cf.cpc.blockNumber 34341
Why does fusion return an error (Errno 111) indicating connection is refused?¶
The Errno 111 can be returned when you call
Web3(Web3.HTTPProvider('http://127.0.0.1:8501')) in fusion.
./cpchain run command cannot be executed successfully?¶
Several reasons can account for this problem. You may try the following means to solve the problem.
- Confirm that you are connecting to the network and the ports you nominated are available.
If you use the command in Quick Start in Detail as
$ ./cpchain run --rpcaddr 127.0.0.1:8501 --port 30311
, make sure both port
30311 have not be occupied yet.
You may also use other ports as you wish.
- Remove temporary user files.
The existence of some temporary files get
cpchain skip some initialization processes,
which may result in an unsuccessful execution.
Type in the following to remove temporary files.
$ ./cpchain chain cleandb
- Manually kill all
An incomplete abort of
cpchain can incur a failure in starting a new process.
If you receive an error message indicating your port or datadir being occupied,
it is highly possible that there are some
cpchain processes still running in background.
You can may either use
ps command paired with
kill to terminate
or choose to kill all cpchain processes by
$ killall -9 cpchain
The file "./cpchain" is not executable by this user pops when running
This problem is due to a wrong access permission of the binary file. You can fix this problem by using the command below:
$ chmod +x cpchain
Fatal: Failed to unlock account pops when running
One possible reason is that the account file is not in the right directory.
In the command
$ ./cpchain run --datadir ./datadir \ --unlock WALLET_ADDRESS \ --rpcaddr 127.0.0.1:8501 --port 30311 --mine \ --rpcapi personal,eth,cpc,admission,net,web3,db,txpool,miner --linenumber
--datadir ./datadir means the account file (keystore) in under
If you create an account without specify a directory,
like using the command
./cpchain account new account instead of
./cpchain account new account --datadir ./datadir,
the account file is created under a default directory,
which is not
In this case, you can either
- Specify YOUR_ACCOUNT_DIRECOTRY after
- Move your account file to
solc is not a compatible version¶
To check the version of solidity, you may utilize the following command:
$ solc --version
And by using
$ which solc command, you can locate the path for default
and replace it with a 0.4.25 version.
$ which solc /usr/bin/solc $ rm -f /usr/bin/solc // copy solc 0.4.25 to /user/bin $ cp solc /usr/bin