how to access the Empirasign abs/mbs API using Python in a functional manner

api_examples_func.py

# -*- coding: utf-8 -*-
"""
api_examples_func.py

this small library illustrates how to access the Empirasign abs/mbs
API using Python in a functional manner

https://gist.github.com/empirasign/cbd204ae7f45bc4eadae
"""
from __future__ import absolute_import
from __future__ import print_function
from __future__ import unicode_literals

import hashlib  #needed to compute request signatures
import datetime

import requests

# constants
API_HOST = "www.empirasign.com"
VERBOSE = False

# user-specific parameters
APP_ID = 'MY_APP_ID'
PW = 'MY_PASS'
PROXY_SERVER = ''  # e.g. proxy.mycompany.net:8080


def _proxies_dict(proxy_server):
    """
    return proxy dictionary as needed by requests library
    if this helper function is not comprehensive enough for your use case, consult
    http://docs.python-requests.org/en/latest/user/advanced/#proxies
    """
    if proxy_server:
        return {'http': 'http://' + PROXY_SERVER, 'https': 'https://' + PROXY_SERVER}
    return {}


def _make_req_sig(args):
    """
    generate request signature
    as a convenience, datetime.date objects autoconvert to YYYYMMDD strings
    """
    args = [arg.strftime("%Y%m%d") if isinstance(arg, datetime.date) else arg for arg in args]
    sig_keys = [APP_ID] + args + [PW]
    return hashlib.sha1("".join(sig_keys).encode('utf-8')).hexdigest()


def get_bond(uid, d0=None, d1=None, fmt='json', prepend_price32=True):
    """
    get bwic and dealer runs data for a specific cusip/ISIN/BBG Ticker
    d0 and d1 are not required, they indicated start and end (inclusive)
    of date range to search, must be datetime.date type
    fmt can be json or csv (if you ask us to support xml, we will think
    less of you)
    """
    api_url = 'http://{}/api/cusip/'.format(API_HOST)
    #compute the request signature
    req_sig = _make_req_sig([uid, datetime.date.today()])
    url_params = {'cusip': uid, 'app_id': APP_ID, 'req_sig': req_sig, 'quote': prepend_price32}
    if d0 and d1:
        url_params['d0'] = d0.strftime("%Y%m%d")
        url_params['d1'] = d1.strftime("%Y%m%d")

    if fmt.lower() != 'json':
        url_params['csv'] = True

    resp = requests.get(api_url, url_params, proxies=_proxies_dict(PROXY_SERVER))
    if VERBOSE:
        print(resp.url)
    if fmt.lower() == 'json':
        return resp.json()
    return resp.text


def get_bonds(uids, d0=None, d1=None, fmt='json'):
    """
    get bwic and dealer runs data for a list of cusips/ISINs/BBG Tickers
    the maxium length of uids processed by server is 200, items 201 and
    higher will be ignored.
    d0 and d1 are not required, they indicated start and end (inclusive)
    of date range to search, must be datetime.date type
    fmt can be json or csv
    """
    api_url = 'http://{}/api/bonds/'.format(API_HOST)

    #compute the request signature
    req_sig = _make_req_sig([",".join(uids), datetime.date.today()])

    req_params = {'app_id': APP_ID, 'req_sig': req_sig, 'bonds': ",".join(uids)}
    if d0 and d1:
        req_params['d0'] = d0.strftime("%Y%m%d")
        req_params['d1'] = d1.strftime("%Y%m%d")
    if fmt.lower() != 'json':
        req_params['csv'] = True

    resp = requests.post(api_url, data=req_params, proxies=_proxies_dict(PROXY_SERVER))
    if VERBOSE:
        print(resp.url)
    if fmt.lower() == 'json':
        return resp.json()
    return resp.text


def get_bwics(sector, d0, d1=None, fmt='json', bsym_sector=False):
    """get summary level data for BWICs in a given sector.  This
    query does not return actual market data so it does not count
    against the daily quota
    d0: start of date range  (max 30 day lookback)
    d1: end of date range
    when d0 = d1, this returns same results as get_bwics_old()
    sector: must be on of the following or server will return an error
    agency, cmbs, nonag, abs, naresi, conabs, clo, euro, eu-clo, eu-resi,
    eu-abs, eu-cmbs, agarm, agcmo, snr, agcmbs, am, aj, io, mezz, unk,
    alta-15, alta-30, alta-a, prime-15, prime-30, prime-a, auto, card,
    equip, heloc, heq, mh, other, student, subprime, utility

    sector descriptions can be found here: www.empirasign.com/api-mbs/
    fmt can be json or csv
    """
    api_url = 'http://{}/api/bwics/'.format(API_HOST)
    # compute the request signature
    # the trick here is the dt for the request signature and dt for the
    # query parameter are the one and the same
    if d0 and d1:
        d0 = d0.strftime("%Y%m%d")
        d1 = d1.strftime("%Y%m%d")
        req_sig = _make_req_sig([sector, d0, d1])
        url_params = {
            'sector': sector,
            'app_id': APP_ID,
            'd0': d0,
            'd1': d1,
            'bsym_sec_type': bsym_sector,
            'req_sig': req_sig
        }
    else:
        # search on single date and pass dt as arg name
        d0 = d0.strftime("%Y%m%d")
        req_sig = _make_req_sig([sector, d0])
        url_params = {
            'sector': sector,
            'app_id': APP_ID,
            'dt': d0,
            'bsym_sec_type': bsym_sector,
            'req_sig': req_sig
        }

    if fmt.lower() != 'json':
        url_params['csv'] = True

    resp = requests.get(api_url, url_params, proxies=_proxies_dict(PROXY_SERVER))
    if VERBOSE:
        print(resp.url)
    if fmt.lower() == 'json':
        return resp.json()
    return resp.text


def get_offers(dt, dealer=None, sector=None, constraints=(), fmt='json'):
    """
    Get all offers for a specific date, or for a dealer/dector/dt combo
    only dt parameter is required as a datetime.date type
    if only dt provided, a list of dealer and sector combos of dealers
    runs available for that date will be returned.  This particular quiery
    as it returns no market data has no query cost.
    if dt, sector and dealer are provided, then the result set will be that
    particular dealer's run for a the given sector and date
    fmt can be json or csv
    """
    api_url = 'http://{}/api/offers/'.format(API_HOST)
    # compute the request signature
    dt = dt.strftime("%Y%m%d")
    if sector and dealer:
        sig_keys = [dealer, sector, dt]
    else:
        sig_keys = [dt]
    req_sig = _make_req_sig(sig_keys)

    url_params = {'app_id': APP_ID, 'dt': dt, 'req_sig': req_sig}
    for key in constraints:
        url_params[key] = constraints[key]
    if sector and dealer:
        url_params.update({'sector': sector, 'dealer': dealer})
    if fmt.lower() != 'json':
        url_params['csv'] = True

    resp = requests.get(api_url, url_params, proxies=_proxies_dict(PROXY_SERVER))
    if VERBOSE:
        print(resp.url)
    if fmt.lower() == 'json':
        return resp.json()
    return resp.text


def get_collab_search(bonds, fmt='json'):
    """
    return a list of similar bonds for each bond in bonds
    based on Empirasign Collaborative Search Algorithm
    https://www.empirasign.com/blog/Collaborative-Search/
    this API METHOD requires HTTP POST
    """

    api_url = 'http://{}/api/collab/'.format(API_HOST)
    dt = datetime.date.today().strftime("%Y%m%d")

    data = {
        'app_id': APP_ID,
        'dt': dt,
        'req_sig': _make_req_sig([",".join(bonds), dt]),
        'bonds': ",".join(bonds)
    }
    if fmt.lower() != 'json':
        data['csv'] = True

    resp = requests.post(api_url, data=data)
    if VERBOSE:
        print(resp.url)
    if fmt.lower() == 'json':
        return resp.json()
    return resp.text


def get_events(n=15, fmt='json'):
    """
    get the latest db events (new bwic, new price talk, or
    new trade color) from the news feed
    this function has no required parameters
    n is the n latest events
    fmt can be json or csv
    """
    api_url = 'http://{}/api/mbsfeed/'.format(API_HOST)
    # compute the request signature
    req_sig = _make_req_sig([str(n), datetime.date.today()])

    url_params = {'app_id': APP_ID, 'n': n, 'req_sig': req_sig}
    if fmt.lower() != 'json':
        url_params['csv'] = True

    resp = requests.get(api_url, url_params, proxies=_proxies_dict(PROXY_SERVER))
    if VERBOSE:
        print(resp.url)
    if fmt.lower() == 'json':
        return resp.json()
    return resp.text


def get_api_status(fmt='json'):
    """
    check API status and see how many requests are left
    fmt can be json or csv
    """
    api_url = 'http://{}/api/mystatus/'.format(API_HOST)
    req_sig = _make_req_sig([datetime.date.today()])

    url_params = {'app_id': APP_ID, 'req_sig': req_sig}
    if fmt.lower() != 'json':
        url_params['csv'] = True

    resp = requests.get(api_url, url_params, proxies=_proxies_dict(PROXY_SERVER))
    if VERBOSE:
        print(resp.url)
    if fmt.lower() == 'json':
        return resp.json()
    return resp.text


def get_query_log(dt=None, fmt='json'):
    """
    get a log of queries made on a given date
    if provided, dt must be a datetime.date type
    fmt can be json or csv
    """
    api_url = 'http://{}/api/query_log/'.format(API_HOST)
    # compute request signature
    if not dt:
        dt = datetime.date.today().strftime("%Y%m%d")
    else:
        dt = dt.strftime("%Y%m%d")
    req_sig = _make_req_sig([dt])

    url_params = {'app_id': APP_ID, 'dt': dt, 'req_sig': req_sig}
    if fmt.lower() != 'json':
        url_params['csv'] = True

    resp = requests.get(api_url, url_params, proxies=_proxies_dict(PROXY_SERVER))
    if VERBOSE:
        print(resp.url)
    if fmt.lower() == 'json':
        return resp.json()
    return resp.text