Source code for schrodinger.application.livedesign.ld_utils

import hashlib

from requests.exceptions import HTTPError

from schrodinger import structure
from schrodinger.structutils import smiles

from . import constants
from . import login

PROPNAME_ROUND_TRIP_HASH = 's_ld_round_trip_hash'


def get_sha1(file_path):
    """
    Return the SHA1 hash of a specified file. If no file path is provided,
    return `None`.

    :param file_path: the path to a file, or `None`
    :type file_path: str or None
    :return: the SHA1 hash of the file located at `file_path`, or `None`
    :rtype: str or None
    """
    if file_path is None:
        return None

    with open(file_path, 'rb') as fh:
        file_data = fh.read()

    return hashlib.sha1(file_data).hexdigest()


def get_round_trip_hash(st):
    """
    Return a hash of relevant structure and host data. This will be used to
    determine whether structures imported from LiveDesign can be exported back
    to LiveDesign using corporate ID (vs. structure) matching.

    :param st: a structure
    :type st: structure.Structure
    :return: a hash value related to the provided structure
    :rtype: str
    """
    generator = smiles.SmilesGenerator(stereo='annotation_and_geom',
                                       unique=True)
    host = login.get_host()
    pattern = generator.getSmiles(st)
    return str(hash((pattern, host)))


def apply_round_trip_hash(st):
    """
    Store a structure-dependent hash as a property on this structure.

    :param st: a structure
    :type st: structure.Structure
    """
    st.property[PROPNAME_ROUND_TRIP_HASH] = get_round_trip_hash(st)


def st_matches_round_trip_hash(st):
    """
    Determine whether the supplied structure can be exported again using the
    stored "round-trip" corporate ID value.

    This can only be done if
        1. The structure was originally imported from the same LD host that it
            is not being exported to.
        2. The SMILES/stereochemistry of the structure has not changed since
            being imported.

    :param st: a structure
    :type st: structure.Structure
    :return: whether the round trip hash value stored on this structure matches
        a newly-generated hash
    :rtype: bool
    """
    stored_hash = st.property.get(PROPNAME_ROUND_TRIP_HASH)
    if stored_hash is None:
        return False
    return stored_hash == get_round_trip_hash(st)


def safely_set_property(st, key, value):
    """
    Set a specified property on a structure. If the supplied `value` is `None`,
    delete the property if it is already defined on the structure if possible.

    :raises ValueError: if this function is asked to delete a permanent
            property, e.g. a structure title
    :param st: a structure
    :type st: structure.Structure
    :param key: a structure property key
    :type key: str
    :param value: the value to store in the structure property dictionary
    :type value: bool or int or float or str or None
    """
    if value is not None:
        st.property[key] = value
    elif key in st.property:
        del st.property[key]


def is_connected(ld_client):
    """
    :param ld_client: a LiveDesign client instance
    :type ld_client: client.LDClient
    :return: whether the supplied client is connected to LiveDesign
    :rtype: bool
    """
    try:
        return ld_client.ping()
    except HTTPError:
        # The user may have been logged out of LiveDesign somehow
        return False


def is_sd_dataname(dataname):
    """
    :param dataname: a structure property data name
    :type dataname: str
    :return: whether the supplied dataname belongs to the "SD" family
    :rtype: bool
    """
    propname = structure.PropertyName(dataname)
    return propname.family.upper() == constants.FAMNAME_SD