MultiChain Developer Q&A - Recent questions tagged savoir

Savoir connection error

Mon, 03 Dec 2018 05:32:56 +0000

>>> from Savoir import Savoir

>>> api = Savoir ('multichainrpc','CaH3f6S8RGnBdpDiLx67FV6m1zBvtDmKnW28tzPgSSPg','localhost','4757','chain1')

>>>api.getinfo()

throws a below error

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "Savoir/Savoir.py", line 58, in __call__
    r = requests.post(url, data=encoded, headers=self.__headers)
  File "/usr/local/lib/python2.7/dist-packages/requests/api.py", line 112, in post
    return request('post', url, data=data, json=json, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/requests/api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/requests/sessions.py", line 518, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/local/lib/python2.7/dist-packages/requests/sessions.py", line 639, in send
    r = adapter.send(request, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/requests/adapters.py", line 488, in send
    raise ConnectionError(err, request=request)
requests.exceptions.ConnectionError: ('Connection aborted.', BadStatusLine("''",))

How do i store images in multichain streams?

Sun, 14 Oct 2018 02:03:09 +0000

And if possible, how to do that in Savoir api using django

Multiprocessing and streams

Thu, 06 Sep 2018 07:21:02 +0000

I've a stream of n items. Instead of retrieving all of them with a single api call, I wanted to make use of multiprocessing. So, I wrote a little code that fetches first n/2 items on a core and fetches the remaining n/2 items on another core. However, I did not obtain any speed-up. So, is interacting with streams not compatible with multiprocessing?

You can see my attempt here: https://gist.github.com/TinfoilHat0/c509deb1219c268b9b2e8aa8e5e6cee5#file-streams_in_parallel-py

Savoir: No JSON object could be decoded

Sat, 03 Mar 2018 22:18:42 +0000

Hi,

I have not been able to use Savoir to make api calls to my multichain node. The node is running in a docker container and I have included rpcallowip of my computer from which I am trying make api calls using python and savoir.

First, making the standard getinfo() call raises "No handlers could be found for logger "Savoir". This is odd. The final error raised is "No JSON object could be decoded".

How can this problem be solved? Many thanks!!

No handlers could be found for logger "Savoir"
Traceback (most recent call last):
File "test_savoir.py", line 10, in <module>
    result=api.listassets()
File "/home/helio/blockchain/multichain/savoir/Savoir/Savoir.py", line 65, in __call__
    log.error("Json: %s" % r.json())
File "/usr/local/lib/python2.7/dist-packages/requests/models.py", line 885, in json
    return complexjson.loads(self.text, **kwargs)
File "/usr/lib/python2.7/json/__init__.py", line 339, in loads
    return _default_decoder.decode(s)
File "/usr/lib/python2.7/json/decoder.py", line 364, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python2.7/json/decoder.py", line 382, in raw_decode
    raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded

Create stream using Savoir API

Mon, 18 Dec 2017 11:01:12 +0000

I am trying to create stream using following code:

...... rpc parameters

api = Savoir(rpcuser, rpcpasswd, rpchost, rpcport, chainname)
txid = api.create('stream', 'certificates2', 'true')

I am receiving following error:

{u'id': 1, u'result': None, u'error': {u'message': u'Invalid open flag, should be boolean', u'code': -8}}

I have been able to run multiple multichain-cli commands using Savoir but experiencing issue with only this one.

Help with sendwithmetadata in Savoir

Sun, 19 Nov 2017 04:57:42 +0000

Hello,

I'm having a problem with the sendwithmetadata command executing from python (Savoir library). I am, however, able to successfully execute the command on the same node server using multi chain-cli. It seems the problem in python is with my json object.....but the solution continues to escape me. Could someone please provide some details on what I am doing wrong? Help would be much appreciated!!

Python code:

api = Savoir(rpcuser, rpcpasswd, rpchost, rpcport, chainname)
api.sendwithmetadata('wallet_address_here', json.dumps({'coin':75.0}), 'badcoffeebadcode')

Result:

Error! Status code: 500
Text: {"result":null,"error":{"code":-1,"message":"value is type str, expected real"},"id":1}

Json: {'result': None, 'error': {'code': -1, 'message': 'value is type str, expected real'}, 'id': 1}

API and RPCUser/RPCPassword

Fri, 13 Oct 2017 07:54:33 +0000

Hi,

I'm building a complex system of sharing data using Multichain in Python with the Savoir Library.

Every node need to write/load/access to every data on the multichain.

I'm using the Savoir API but that require to use the RPCUser/RPCPassword of the Master Node ADMIN to connect to the other node so I have that sensible data spread everywhere and this make me nervous a little.

I know I can build a new user, give him just connect, send and receive permission, but how I can use that user with the API ?

The right way to avoid this is to build a local copy of the multichain and use local RPCUser / RPC Password ?

Thi require to download tons of data so I would prefer to let the user choice if connect to an already present node or to download all the data locally.

Thank you.

Calling addmultisigaddress using Savoir

Tue, 30 May 2017 18:25:17 +0000

What is the proper way to pass in the parameters for the addmultisigaddress api command to the multichain using Savoir in a Python script?

I'm currently passing in this:

api.addmultisigaddress(2, ['0241f53c7534e3beeb181fe6ecfc6478d88c7a425102cd672d764e89dec0be56db', '0276a87d946812612a79d45a141d9f2dd2ed767187b686f5bb97bb1088ef70fc38'] )

But getting a status code of 500 being returned. I've tried numerous other formats as well but none seem to work.

Python Savoir connection error.

Fri, 28 Apr 2017 02:35:16 +0000

Hi i installed Multichain & Savoir in two nodes(two laptops) and started "chain1" from the node1 and node2 connected to the chain1. now i am trying to run the program(using Savoir) to connect to chain1 from node2 i am getting the following error in node2

requests.exceptions.ConnectionError: HTTPConnectionPool(host='localhost', port=4372): Max retries exceeded with url: / (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x7f44a3d24e10>: Failed to establish a new connection: [Errno 111] Connection refused',))

node1 multichain.conf

rpcuser=multichainrpc
rpcpassword=vTxv7DnYxX1hx9ZH8uHepHHMaCf1c9ftGmtGYVcF4rN

node2 multichain.conf

rpcuser=multichainrpc
rpcpassword=EEhoZ4nE5czYwWtNQzUixNwtwmnhjjjChudMZSrMFAsB

node1 program

import Savoir
rpcuser='multichainrpc'
rpcpasswd='vTxv7DnYxX1hx9ZH8uHepHHMaCf1c9ftGmtGYVcF4rN'
rpchost = 'localhost'
rpcport = '4372'
chainname = 'chain1'
api = Savoir.Savoir(rpcuser, rpcpasswd, rpchost, rpcport, chainname)
print api
print api.getaddressesbyaccount("")[0] # working

node2 program

import Savoir
rpcuser='multichainrpc'
rpcpasswd='EEhoZ4nE5czYwWtNQzUixNwtwmnhjjjChudMZSrMFAsB'
rpchost = 'localhost'
rpcport = '4372'
chainname = 'chain1'
api = Savoir.Savoir(rpcuser, rpcpasswd, rpchost, rpcport, chainname)
print api
print api.getaddressesbyaccount("")[0] # working

Please can someone suggest me what i am missing here, do i need to add anything in the multichain.conf file in the node1.

Note : I have followed the same procedure 3 months back i was successfull that time.

Can Savoir python handle many request at same time?

Wed, 26 Apr 2017 15:12:16 +0000

Hello guys,

I would like to ask a question related with MultiChain Json RPC performance.

I developed the python project with Savoir and run the performance test with 10 users and the delay between each request was 10 milliseconds. When I run this, the Multichain RPC does not respond it.

After that, I tried it with linux shell using multichain-cli, and the test run successfully.

What is the problem or solution for this case?

Is JSON RPC of Multichain possible to handle many requests at the same time?

Thank you,

Tom

python api connection (newbie)

Wed, 12 Apr 2017 03:34:39 +0000

Hello, Im new to this blockchain. I have setup the multichain and everything run as expected but when I tried to make rpc request using savoir it raised the exception. I know that's the problem with the connection that multichain server refused the connection. The question is, what is the step for savoir connection to the multichain server.. I mean the proper step and the config i need to put into the multichain.conf file... Sorry Im really new to this multichain.

Error in using Savoir on Ubuntu

Thu, 09 Mar 2017 17:37:16 +0000

>>> from Savoir import Savoir

>>>

>>> rpcuser='multichainrpc'

>>> rpcpasswd='2Swdfbx8FQJ9mdGmWWxVZL1eGSqxdkPGAU8dWkMf4vUw'

>>> rpchost = 'localhost'

>>> rpcport = '4245'

>>> chainname = 'chain0'

>>> api = Savoir(rpcuser, rpcpasswd, rpchost, rpcport, chainname)

>>> api.getinfo()

Traceback (most recent call last):

File "<stdin>", line 1, in <module>

File "/home/ubuntu/.local/lib/python2.7/site-packages/Savoir/Savoir.py", line 58, in __call__

r = requests.post(url, data=encoded, headers=self.__headers)

File "/home/ubuntu/.local/lib/python2.7/site-packages/requests/api.py", line 110, in post

return request('post', url, data=data, json=json, **kwargs)

File "/home/ubuntu/.local/lib/python2.7/site-packages/requests/api.py", line 56, in request

return session.request(method=method, url=url, **kwargs)

File "/home/ubuntu/.local/lib/python2.7/site-packages/requests/sessions.py", line 488, in request

resp = self.send(prep, **send_kwargs)

File "/home/ubuntu/.local/lib/python2.7/site-packages/requests/sessions.py", line 609, in send

r = adapter.send(request, **kwargs)

File "/home/ubuntu/.local/lib/python2.7/site-packages/requests/adapters.py", line 473, in send

raise ConnectionError(err, request=request)

requests.exceptions.ConnectionError: ('Connection aborted.', BadStatusLine("''",))

My ports open ports seem to be correct (from netstat --listen):

tcp 0 0 localhost:4244 *:* LISTEN

tcp 0 0 *:4245 *:* LISTEN

tcp 0 0 *:ssh *:* LISTEN

Python Savoir API "no json object could be decoded"

Wed, 01 Feb 2017 18:10:43 +0000

Hi,

I was trying to test the code under : https://github.com/DXMarkets/Savoir. I have two nodes on different server. I can use code to access the node on the save server. However, when I try to run similar code on another server, it gave the following error:

No handlers could be found for logger "Savoir"
Traceback (most recent call last):
  File "ptest.py", line 12, in <module>
    print(api.getinfo())
  File "/usr/lib/python2.7/site-packages/Savoir/Savoir.py", line 65, in __call__
    log.error("Json: %s" % r.json())
  File "/usr/lib/python2.7/site-packages/requests/models.py", line 850, in json
    return complexjson.loads(self.text, **kwargs)
  File "/usr/lib64/python2.7/json/__init__.py", line 338, in loads
    return _default_decoder.decode(s)
  File "/usr/lib64/python2.7/json/decoder.py", line 366, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib64/python2.7/json/decoder.py", line 384, in raw_decode
    raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded

Anyone has any suggestion?

How can I use hexadecimal metadata in any JSON-based API when hex is not supported by JSON?

Tue, 16 Aug 2016 06:57:28 +0000

Hello,

While I am specifically trying to use Savoir, the Python API, this is a general question for the JSON-based request APIs. How do I pass the metadata argument to the function call? A sample call would look like:

api.sendwithmetadata('16T5dDM5TQRP1SQ2o86iWD1K6gCr8PV1231232', '{"asset1":1}', '48692066726f6d204d756c7469436861696e21')

But when I convert the hex argument to a decimal in order to make it JSON serializable, I get a parse error. If I leave it as is, I get an error saying expected real, got str. I've looked into encoding and decoding, but that has not solved the issue. What would be the appropriate way to make this API call, ideally in Python?

Thank you in advance.