Create balance observation API endpoint

[olemis]

[POST] /api/balances/{address}/observation

Should remember the wallet address to observe the wallet balance and return it in the [GET] /api/balances , if the balance is non zero.

Errors:
■ 409 Conflict - specified address is already observed.

Python implementation

@api.route('/balances/<string:address>/observation', methods=['POST'])
def add_observation(address):
    """
    Add the specified address to observation list
    """

    if isValidAddress(address):
        result = add_address_observation(address)
    else:
        result = dict(error='Invalid address', status=422)

    # if successfully stored in observation list, return a plain 200
    if "error" in result:
        return make_response(jsonify(build_error(result["error"])), result["status"])
    else:
        return ""