Import client libraries, allow to make grpc calls to services

.gitignore

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+venv/
+.idea
+snet_sdk.egg-info/
+blockchain/node_modules/
+__pycache__
+snet_sdk/resources/contracts/abi
+snet_sdk/resources/contracts/networks

README.md

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+# snet-sdk-python
+
+SingularityNET SDK for Python
+
+## Getting Started  
+
+These instructions are for the development and use of the SingularityNET SDK for Python.
+
+### Usage
+
+The SingularityNET SDK allows you to import compiled client libraries for your service or services or choice and make calls to those services programmatically from your application by setting up state channels with the providers of those services and making gRPC calls to the SingularityNET daemons for those services by selecting a channel with sufficient funding and supplying the appropriate metadata for authentication.
+
+Once you have installed the snet-sdk in your current environment and it's in your PYTHONPATH, you should import it and create an instance of the base sdk class:
+
+```python
+from snet_sdk import Snet
+import config
+snet = Snet(private_key=config.private_key)
+```
+
+Now, the instance of the sdk can be used to instantiate clients for SingularityNET services. To interact with those services, the sdk needs to be supplied the compiled client libraries and a reference to their path on your file system.
+
+To generate the client libraries, you need the SingularityNET Command Line Interface, or CLI, which you can download from PyPi, see [https://github.com/singnet/snet-cli#installing-with-pip](https://github.com/singnet/snet-cli#installing-with-pip)
+
+Once you have the CLI installed, run the following command:
+```bash
+snet sdk generate-client-library python <org_id> <service_id>
+```
+
+Optionally, you can specify an output path; otherwise it's going to be `./client_libraries/python/<org_id>/<service_id>`
+
+Now, by default the sdk is going to look for those client libraries in the `./grpc/<org_id>/<service_id>` in the directory of the main process of the module it's being imported by.
+
+Once you have the generated client libraries in place, you can create an instance of a SingularityNET service client:
+```python
+client = snet.client("<org_id>", "<service_id>")
+```
+
+The client exposes the following properties and methods:
+- All of the modules from the generated client library as `client.grpc.<module_name`. These are temporarily added to your PYTHONPATH and imported at runtime
+- Functions to open, fund and extend state channels
+- Functions to retrieve the list of state channels between you and the service provider from the blockchain
+- Functions to get the updated state for a specific channel from the service provider, signed by yourself
+- Functions to generate and sign the required metadata to make gRPC calls to the service daemon
+
+This is an example of how to make a call to a SingularityNET service in the `snet` organization with the `example-service` service_id using the base SDK and client instances created as shown before:  
+```python
+stub = client.grpc.example_service_pb2_grpc.CalculatorStub(client.grpc_channel)
+request = calculator.grpc.example_service_pb2.Numbers(a=10, b=12)
+result = stub.add(request)
+print(result)
+```
+If you have no open state channels with the service provider, you can create one by calling the following function:
+```python
+client.open_channel()
+```
+By default, this will create a channel with the shortest possible expiration date and the necessary amount to make 100 service calls.  
+Once an open channel is created and funded, the sdk will automatically find and use a funded, non-expired channel.
+
+For more information about gRPC and how to use it with Python, please see:
+- [gRPC Basics - Python](https://grpc.io/docs/tutorials/basic/python.html)
+- [gRPC Python’s documentation](https://grpc.io/grpc/python/)
+
+---
+
+## Development
+
+### Installing
+
+#### Prerequisites  
+
+* [Python 3.6.5](https://www.python.org/downloads/release/python-365/)  
+* [Node 8+ w/npm](https://nodejs.org/en/download/)
+
+---
+
+* Clone the git repository  
+```bash  
+$ git clone [email protected]:singnet/snet-sdk-python.git
+$ cd snet-sdk-python
+```  
+
+* Install development/test blockchain dependencies  
+```bash  
+$ ./scripts/blockchain install
+```
+
+* Install the package in development/editable mode  
+```bash  
+$ pip install -e .
+```
+
+### Versioning  
+
+We use [SemVer](http://semver.org/) for versioning. For the versions available, see the
+[tags on this repository](https://github.com/singnet/snet-sdk-python/tags).   
+
+## License  
+
+This project is licensed under the MIT License - see the
+[LICENSE](https://github.com/singnet/snet-sdk-python/blob/master/LICENSE) file for details.

blockchain/package.json

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+{
+  "dependencies": {
+    "singularitynet-platform-contracts": "0.2.6",
+    "singularitynet-token-contracts": "2.0.1"
+  }
+}

scripts/blockchain

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+#!/usr/bin/env python3
+
+import os
+import pathlib
+import shutil
+import subprocess
+import sys
+
+
+def main():
+    assert len(sys.argv) > 1, "please select a target from 'install', 'uninstall'"
+    target = sys.argv[1]
+    blockchain_dir = pathlib.Path(__file__).absolute().parent.parent.joinpath("blockchain")
+    node_modules_dir = blockchain_dir.joinpath("node_modules")
+    platform_json_src_dir = node_modules_dir.joinpath("singularitynet-platform-contracts")
+    token_json_src_dir = node_modules_dir.joinpath("singularitynet-token-contracts")
+    token_contract_name = "SingularityNetToken"
+    contract_json_dest_dir = pathlib.Path(__file__).absolute().parent.parent.joinpath("snet_sdk", "resources", "contracts")
+    abi_contract_names = ["Registry", "MultiPartyEscrow"]
+    networks_contract_names = ["Registry", "MultiPartyEscrow"]
+
+    npm_location = shutil.which('npm')
+    if not npm_location:
+        raise Exception("This script requires 'npm' to be installed and in your PATH")
+
+    if target == "install":
+        shutil.rmtree(contract_json_dest_dir)
+
+        subprocess.call([npm_location, "install"], cwd=blockchain_dir)
+
+        os.makedirs(contract_json_dest_dir.joinpath("abi"), exist_ok=True)
+        os.makedirs(contract_json_dest_dir.joinpath("networks"), exist_ok=True)
+
+        for contract_name in abi_contract_names:
+            shutil.copy(platform_json_src_dir.joinpath("abi", "{}.json".format(contract_name)),
+                        contract_json_dest_dir.joinpath("abi", "{}.json".format(contract_name)))
+        for contract_name in networks_contract_names:
+            shutil.copy(platform_json_src_dir.joinpath("networks", "{}.json".format(contract_name)),
+                        contract_json_dest_dir.joinpath("networks", "{}.json".format(contract_name)))
+
+        shutil.copy(token_json_src_dir.joinpath("abi", "{}.json".format(token_contract_name)),
+                    contract_json_dest_dir.joinpath("abi", "{}.json".format(token_contract_name)))
+        shutil.copy(token_json_src_dir.joinpath("networks", "{}.json".format(token_contract_name)),
+                    contract_json_dest_dir.joinpath("networks", "{}.json".format(token_contract_name)))
+    elif target == "uninstall":
+        try:
+            shutil.rmtree(node_modules_dir)
+            shutil.rmtree(contract_json_dest_dir.joinpath("abi"))
+            shutil.rmtree(contract_json_dest_dir.joinpath("networks"))
+        except FileNotFoundError:
+            pass
+
+
+if __name__ == "__main__":
+    main()

setup.py

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+from setuptools import setup, find_packages
+import re
+
+with open('snet_sdk/__init__.py', 'rt', encoding='utf8') as f:
+    version = re.search(r'__version__ = "(.*?)"', f.read()).group(1)
+
+setup(
+    name='snet_sdk',
+    version=version,
+    packages=find_packages(),
+    url='https://github.com/singnet/snet-sdk-python',
+    license='MIT',
+    author='SingularityNET Foundation',
+    author_email='[email protected]',
+    description='SingularityNET Python SDK',
+    install_requires=[
+        'grpcio-tools==1.17.1',
+        'ecdsa==0.13',
+        'web3==4.2.1',
+        'ipfsapi==0.4.2.post1',
+        'rfc3986==1.1.0'
+    ]
+)