Bitshares HUG API - Updates!

Updates

• Added new functions: get_bts_object, get_committee_member, get_committee_members, get_worker_proposals, get_worker.
• Changed formatting of readme & added more example json snippets.
• Refactored several functions, reducing code line count.
• Removed tx_limit references due to incorrect use.
• Reduced occurrence of internal server errors.

Please do try the commands, and provide complains/feedback, thanks :)

I'll be talking about this deliverable during the 52nd Bitshares Hangout on 30th December 2017.

About

The intention of this Bitshares HUG REST API repo is to provide the Bitshares network an open-source high performance interface to the Bitshares network through simple GET requests.

By following the readme, you can easily recreate the API in your own control. Do remember to change the API key and the Bitshares FULL/API node you're connecting to. If you're creating a service which will produce a large amount of traffic, alert the node operator or consider running your own Bitshares node.

This HUG REST API makes heavy use of the python-bitshares

TODO

Improve the NGINX & Gunicorn configurations
Implement additional HUG functions using websockets to access data inaccessible via python-bitshares.
Work on date range input for iterable objects like market_history, trade_history and asset_holder data. (See: [Issue #30](https://github.com/xeroc/python-bitshares/issues/30)).
Investigate functions for dumping large amounts of data (years of data).

License

The contents of this entire repo should be considered MIT licenced.

How to contribute

It's difficult to debug development issues whilst running behind Gunicorn & NGINX, you're best running the HUG REST API directly with HUG during development "hug -f bts_api.py". Note that running HUG directly in this manner should only be performed during development, it is not suitable for exposing directly to the public as a production ready API.

About : Python-Bitshares

https://github.com/xeroc/python-bitshares/tree/develop

Created by xeroc, it's a thorough Bitshares python library which will be extensively used throughout this API. We won't be using it for any serious wallet control, purely the read-only blockchain/account/asset monitoring functionality.

Web Docs: http://docs.pybitshares.com/en/latest/

PDF Docs: https://media.readthedocs.org/pdf/python-bitshares/latest/python-bitshares.pdf

About: HUG

Embrace the APIs of the future

Drastically simplify API development over multiple interfaces. With hug, design and develop your API once, then expose it however your clients need to consume it. Be it locally, over HTTP, or through the command line - hug is the fastest and most modern way to create APIs on Python3.

Unparalleled performance

hug has been built from the ground up with performance in mind. It is built to consume resources only when necessary and is then compiled with Cython to achieve amazing performance. As a result, hug consistently benchmarks as one of the fastest Python frameworks and without question takes the crown as the fastest high-level framework for Python 3.

Source: Official website.

About: Extensibility

If your HUG functions takes a long time to compute, then you must account for NGINX & Gunicorn worker timeouts (both the systemctl service file & the 'default' NGINX sites-available file). If you fail to account for this, the user will experience unhandled timeouts.

Since HUG utilizes Python, any Python library can be used to process/manipulate Bitshares data.

Ideally, rather than over-scraping data we should cache it or limit scraping functions to large batches (1000 instead of 500k etc).

---

Install guide

This is an install guide for Ubuntu 17.10, it uses Python3+, HUG, Gunicorn & NGINX. If you change the OS or server components then the following guide will be less applicable, if you succeed please do provide a separate readme for alternative implementation solutions.

Setup dependencies & Python environment

NOTE: We use the develop branch of python-bitshares because it uses the pycryptodome package (required since pycrypto is depreciated).

We create the 'btsapi' user, however you could rename this to whatever you want, just remember to change the NGINX & Gunicorn configuration files.

Setup a dedicated user

adduser btsapi
<ENTER NEW PASSWORD>
<CONFIRM NEW PASSWORD>
usermod -aG sudo btsapi
sudo usermod -a -G www-data btsapi
su - btsapi

Install required applications

sudo apt-get install libffi-dev libssl-dev python3-pip python3-dev build-essential git nginx python3-setuptools virtualenv libcurl4-openssl-dev

Create Python virtual environment

mkdir HUG
virtualenv -p python3 HUG
echo "source ./HUG/bin/activate" > access_env.sh
chmod +x access_env.sh
source access_env.sh

Install Python packages

pip3 install --upgrade pip
pip3 install --upgrade setuptools
pip3 install --upgrade wheel
pip3 install requests
pip3 install lomond
pip3 install hug
pip3 install gunicorn
git clone https://github.com/xeroc/python-bitshares.git -b develop
pip3 install -e python-bitshares/

Configure NGINX

NGINX serves as a reverse web proxy to Gunicorn & uses an UNIX socket instead of an IP address for referencing Gunicorn.

Copy the nginx.conf file to /etc/nginx/
Reset nginx (sudo service nginx restart)

sudo mv default /etc/nginx/sites-available/default

Implement SSL Cert

You aught to implement a free LetsEncrypt SSL certificate, this requires a domain name (they don't sign IP addresses) and it needs to be renewed every few months by running certbot again.

https://certbot.eff.org/

sudo add-apt-repository ppa:certbot/certbot
sudo apt-get update
sudo apt-get install python-certbot-nginx
sudo certbot --nginx -d api.domain.tld

Configure Gunicorn

Official website: http://gunicorn.org/

Documentation: http://docs.gunicorn.org/en/stable/

Gunicorn is used to provide scalable worker process management and task buffering for the HUG REST API. Gunicorn's documentation states that each CPU can provide roughly 2-3+ Gunicorn workers, however it may be able to achieve a higher quantity (worth testing).

cp gunicorn.service /etc/systemd/system/gunicorn.service
sudo systemctl start gunicorn
sudo systemctl enable gunicorn

MISC

If you make changes to the service or the hug script:

sudo systemctl daemon-reload
sudo systemctl restart gunicorn

If you want to monitor Gunicorn:

tail -f gunicorn_access_log
tail -f gunicorn_error_log
sudo systemctl status gunicorn

---

Available HUG REST API functionality

This section will detail the functionality which will be available to the public through GET requests.

The functions are currently all read-only functions, enabling the public to request data from the network without the risk of exposing critical wallet controls.

Asset functions

More info: python-bitshares docs

get_asset

Retrieve basic information about an individual asset & return in JSON!

Parameters

• asset_name string
• api_key string

Usage

https://subdomain.domain.tld/get_asset?asset_name=USD&api_key=123abc

Run Command

Example JSON output

MISC functions

get_bts_oject

Request any Bitshares object's high level overview. Does not provide in depth details (ie asset/account/witness/.. details).

List of possible objects

Parameters

• object_id 2.0.0 (string)
• api_key string

Usage

https://subdomain.domain.tld/get_bts_oject?object_id=2.0.0&api_key=API_KEY

Run Command

Blockchain functions

More info: python-bitshares docs

chain_info

A high level overview of the Bitshares chain information.

Parameters

• api_key string

Usage

https://subdomain.domain.tld/chain_info?&api_key=API_KEY

Run Command

Example JSON output

get_chain_properties

Get chain properties, return in JSON.

Parameters

• api_key string

Usage

https://subdomain.domain.tld/get_chain_properties?api_key=API_KEY

Run Command

Example JSON output

{
  "chain_properties": {
    "id": "2.11.0",
    "chain_id": "4018d7844c78f6a6c41c6a552b898022310fc5dec06da467ee7905a8dad512c8",
    "immutable_parameters": {
      "min_committee_member_count": 11,
      "min_witness_count": 11,
      "num_special_accounts": 100,
      "num_special_assets": 100
    }
  },
  "valid_key": true,
  "took": 0.01954
}

get_network

Return BTS network information in JSON.

Parameters

• api_key string

Usage

https://subdomain.domain.tld/get_network?api_key=API_KEY

Run Command

Example JSON output

{
  "get_network": {
    "chain_id": "4018d7844c78f6a6c41c6a552b898022310fc5dec06da467ee7905a8dad512c8",
    "core_symbol": "BTS",
    "prefix": "BTS"
  },
  "valid_key": true,
  "took": 0.12271
}

get_info

This call returns the dynamic global properties in JSON.

Parameters

• api_key string

Usage

https://subdomain.domain.tld/get_info?api_key=API_KEY

Run Command

Example JSON output

get_config

Returns object 2.0.0 in JSON.

Parameters

• api_key string

Usage

https://subdomain.domain.tld/get_config?api_key=API_KEY

Run Command

Example JSON output

get_block_details

Retrieve the specified block's date/time details, return in JSON.

Parameters

• block_number number
• api_key string

Usage

https://subdomain.domain.tld/get_block_details?block_number=10&api_key=API_KEY

Run Command

Example JSON output

{
  "previous": "0000003157e4849fe0d04e1f60462764d2a1f3d1",
  "timestamp": "2015-10-13T14:15:00",
  "witness": "1.6.5",
  "transaction_merkle_root": "0000000000000000000000000000000000000000",
  "extensions": [],
  "witness_signature": "1f0441febc1a8ce32287749ba5ec2797be8202eab82e6275340c508e16238cd7af21aba15a1c09bbeca03751fd4abb10580e1fea69a4f4dde17b9b54b4beeb654b",
  "transactions": [],
  "id": "50",
  "date": "2015-10-13T14:15:00",
  "block_number": 50,
  "valid_block_number": true,
  "valid_key": true,
  "took": 0.04568
}

get_latest_block

Retrieve the details of the latest block, return in JSON.

Parameters

• api_key string

Usage

https://subdomain.domain.tld/get_latest_block?api_key=API_KEY

Run Command

Example JSON output

get_all_accounts

Retrieve all Bitshares account names. Takes a while!

Parameters

• api_key string

Usage

https://subdomain.domain.tld/get_all_accounts?api_key=API_KEY

Run Command

Example JSON output

{
  'accounts': [{acc1, acc2, ...}],
  'num_accounts': 500000,
  'valid_key': True,
  'took': 20.5
}

Account information functions

More info: python-bitshares docs

account_balances

Given a valid account name, output the user's balances in JSON.

Parameters

• account string
• api_key string

Usage

https://subdomain.domain.tld/account_balances?account=example_usera&api_key=API_KEY

Run Command

Example JSON output

account_open_orders

Given a valid account name, output the user's open orders in JSON.

Parameters

• account_name string
• api_key string

Usage

https://subdomain.domain.tld/account_open_orders?account_name=example_usera&api_key=API_KEY

Run Command

Example JSON output

account_callpositions

Given a valid account name, output the user's call positions in JSON.

Note: Highly verbose! Example contains 26k lines of JSON!

Parameters

• account string
• api_key string

Usage

https://subdomain.domain.tld/account_callpositions?account=example_usera&api_key=API_KEY

Run Command

Example JSON output

account_history

Given a valid account name and transaction history limit (int), output the user's transaction history in JSON.

Parameters

• account_name string
• api_key string

Usage

https://subdomain.domain.tld/account_history?account_name=example_user&api_key=API_KEY

Run Command

Example JSON output

account_is_ltm

Given a valid account name, check if the user has LTM.

Parameters

• account_name string
• api_key string

Usage

https://subdomain.domain.tld/account_is_ltm?account_name=example_user&api_key=API_KEY

Run Command

Example JSON output

{
  "account_is_ltm": true,
  "account": "xeroc",
  "valid_account": true,
  "valid_key": true,
  "took": 0.14034
}

DEX functions

More info: python-bitshares docs

list_fees

Retrieve the currently implemented fees in JSON format.

Parameters

• api_key string

Usage

https://subdomain.domain.tld/list_fees?api_key=API_KEY

Run Command

Example JSON output

Market information functions

More info: python-bitshares docs

market_ticker

Given a valid market pair (e.g. USD:BTS), output the market pair's ticker information in JSON.

Parameters

• market_pair base:quote (string)
• api_key string

Usage

https://subdomain.domain.tld/market_ticker?market_pair=USD:BTS&api_key=API_KEY

Run Command

Example JSON output

market_orderbook

Given a valid market pair (e.g. USD:BTS) and your desired orderbook size limit, output the market pair's orderbook (buy/sell order) information in JSON.

Parameters

• market_pair base:quote (string)
• orderbook_limit number
• api_key string

Usage

https://subdomain.domain.tld/market_orderbook?market_pair=USD:BTS&orderbook_limit=25&api_key=API_KEY

Run Command

Example JSON output

market_24hr_vol

Given a valid market_pair (e.g. USD:BTS), output their 24hr market volume in JSON.

Parameters

• market_pair base:quote (string)
• api_key string

Usage

https://subdomain.domain.tld/market_24hr_vol?market_pair=USD:BTS&api_key=API_KEY

Run Command

Example JSON output

market_trade_history

Given a valid market_pair (e.g. USD:BTS) & a TX limit, output the market's trade history in JSON.

Parameters

• market_pair base:quote (string)
• api_key string

Usage

https://subdomain.domain.tld/market_trade_history?market_pair=USD:BTS&api_key=API_KEY

Run Command

Example JSON output

Witness functions

More info: python-bitshares docs

find_witness

Find details about a specific witness.

Parameters

• witness_name string
• api_key string

Usage

https://subdomain.domain.tld/find_witness?witness_name=sc-ol&api_key=API_KEY

Run Command

Example JSON output

list_of_witnesses

Retrieve a list of available witnesses.

Parameters

• api_key string

Usage

https://subdomain.domain.tld/list_of_witnesses?api_key=API_KEY

Run Command

Example JSON output

Committee functions

To implement this, we need to use the 'Requests' python library to access functionality currently not present in the python-bitshares library (AFAIK).

get_committee_member

Retrieve a single committee member's full account (and role) information.

Parameters

• committee_id 1.5.0 (string)
• api_key string

Usage

https://subdomain.domain.tld/get_committee_member?committee_id=1.5.10&api_key=API_KEY

Run Command

Example JSON output

get_committee_members

Get a list of all committee members, and their Bitshares account details.

Run Command

Usage

https://subdomain.domain.tld/get_committee_members?api_key=API_KEY

Example JSON output

Worker functions

Similar to the committee function, we need to use the 'Requests' python library to access functionality currently not present in the python-bitshares library (AFAIK).

get_worker

Retrieve an individual worker proposal & its associated proposer account details.

Parameters:

• worker_id 1.14.x (string)
• api_key string

Usage

https://subdomain.domain.tld/get_worker?worker_id=1.14.x&api_key=API_KEY

Run Command

Example JSON output

get_worker_proposals

Retrieve a list of all worker proposals (including past/inactive) and the worker account details.

Parameters:

• api_key string

Usage

https://subdomain.domain.tld/get_worker_proposals?api_key=API_KEY

Run Command

Example JSON output