#!/usr/bin/env python

# This work was created by participants in the DataONE project, and is
# jointly copyrighted by participating institutions in DataONE. For
# more information on DataONE, see our web site at http://dataone.org.
#
#   Copyright 2009-2019 DataONE
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import http.client
import logging

import pyxb

import d1_common.types.exceptions


class ObjectListIterator(object):
    """Serial ObjectList Iterator.

    Iterate over information about Science Objects available on Member Nodes.

    This is a serial implementation. See :ref:`d1_client/ref/iterators:DataONE
    Iterators` for an overview of the available iterator types and implementations.
    """

    def __init__(
        self, client, start=0, fromDate=None, pagesize=500, max_count=-1, nodeId=None
    ):
        """
        :param client: The client instance for retrieving stuff.
        :type client: DataONEBaseClient or derivative
        :param start: The zero based starting index value (0)
        :type start: integer
        :param fromDate:
        :type fromDate: DateTime
        :param pagesize: Number of items to retrieve in a single request (page, 500)
        :type pagesize: integer
        :param max_count: Maximum number of items to retrieve (all)
        :type max_count: integer

        """
        self._log = logging.getLogger(__name__)
        self._object_list = None
        self._czero = 0
        self._citem = 0
        self._pageoffs = 0
        self._client = client

        if 0 <= max_count < pagesize:
            pagesize = max_count

        self._pagesize = pagesize

        self._fromDate = fromDate
        self._nodeId = nodeId

        self._loadMore(start=start)

        if max_count > 0:
            self._maxitem = max_count
        else:
            self._maxitem = self._object_list.total

    def __iter__(self):
        return self

    def __next__(self):
        """Implements the next() method for the iterator.

        Returns the next ObjectInfo instance. Loads more if at the end of the page and
        there's more pages to load.

        """
        self._log.debug(
            "%d / %d (%d)"
            % (self._citem, self._maxitem, len(self._object_list.objectInfo))
        )
        if self._citem >= self._maxitem:
            raise StopIteration
        if (self._pageoffs) >= len(self._object_list.objectInfo):
            self._loadMore(start=self._czero + len(self._object_list.objectInfo))
            if len(self._object_list.objectInfo) < 1:
                raise StopIteration
        res = self._object_list.objectInfo[self._pageoffs]
        self._citem += 1
        self._pageoffs += 1
        return res

    def _loadMore(self, start=0, try_count=0, validation=True):
        """Retrieves the next page of results."""
        self._log.debug("Loading page starting from %d" % start)
        self._czero = start
        self._pageoffs = 0
        try:
            pyxb.RequireValidWhenParsing(validation)
            self._object_list = self._client.listObjects(
                start=start,
                count=self._pagesize,
                fromDate=self._fromDate,
                nodeId=self._nodeId,
            )
        except http.client.BadStatusLine as e:
            self._log.warning("Server responded with Bad Status Line. Retrying in 5sec")
            self._client.connection.close()
            if try_count > 3:
                raise e
            try_count += 1
            self._loadMore(start, try_count)
        except d1_common.types.exceptions.ServiceFailure as e:
            self._log.error(e)
            if try_count > 3:
                raise e
            try_count += 1
            self._loadMore(start, try_count, validation=False)

    def __len__(self):
        """Implements len(ObjectListIterator)"""
        return self._maxitem

#!/usr/bin/env python

# This work was created by participants in the DataONE project, and is
# jointly copyrighted by participating institutions in DataONE. For
# more information on DataONE, see our web site at http://dataone.org.
#
#   Copyright 2009-2019 DataONE
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import http.client
import logging

import pyxb

import d1_common.types.exceptions


class ObjectListIterator(object):
    """Serial ObjectList Iterator.

    Iterate over information about Science Objects available on Member Nodes.

    This is a serial implementation. See :ref:`d1_client/ref/iterators:DataONE
    Iterators` for an overview of the available iterator types and implementations.
    """

    def __init__(
        self, client, start=0, fromDate=None, pagesize=500, max_count=-1, nodeId=None
    ):
        """
        :param client: The client instance for retrieving stuff.
        :type client: DataONEBaseClient or derivative
        :param start: The zero based starting index value (0)
        :type start: integer
        :param fromDate:
        :type fromDate: DateTime
        :param pagesize: Number of items to retrieve in a single request (page, 500)
        :type pagesize: integer
        :param max_count: Maximum number of items to retrieve (all)
        :type max_count: integer

        """
        self._log = logging.getLogger(__name__)
        self._object_list = None
        self._czero = 0
        self._citem = 0
        self._pageoffs = 0
        self._client = client

        if 0 <= max_count < pagesize:
            pagesize = max_count

        self._pagesize = pagesize

        self._fromDate = fromDate
        self._nodeId = nodeId

        self._loadMore(start=start)

        if max_count > 0:
            self._maxitem = max_count
        else:
            self._maxitem = self._object_list.total

    def __iter__(self):
        return self

    def __next__(self):
        """Implements the next() method for the iterator.

        Returns the next ObjectInfo instance. Loads more if at the end of the page and
        there's more pages to load.

        """
        self._log.debug(
            "%d / %d (%d)"
            % (self._citem, self._maxitem, len(self._object_list.objectInfo))
        )
        if self._citem >= self._maxitem:
            raise StopIteration
        if (self._pageoffs) >= len(self._object_list.objectInfo):
            self._loadMore(start=self._czero + len(self._object_list.objectInfo))
            if len(self._object_list.objectInfo) < 1:
                raise StopIteration
        res = self._object_list.objectInfo[self._pageoffs]
        self._citem += 1
        self._pageoffs += 1
        return res

    def _loadMore(self, start=0, try_count=0, validation=True):
        """Retrieves the next page of results."""
        self._log.debug("Loading page starting from %d" % start)
        self._czero = start
        self._pageoffs = 0
        try:
            pyxb.RequireValidWhenParsing(validation)
            self._object_list = self._client.listObjects(
                start=start,
                count=self._pagesize,
                fromDate=self._fromDate,
                nodeId=self._nodeId,
            )
        except http.client.BadStatusLine as e:
            self._log.warning("Server responded with Bad Status Line. Retrying in 5sec")
            self._client.connection.close()
            if try_count > 3:
                raise e
            try_count += 1
            self._loadMore(start, try_count)
        except d1_common.types.exceptions.ServiceFailure as e:
            self._log.error(e)
            if try_count > 3:
                raise e
            try_count += 1
            self._loadMore(start, try_count, validation=False)

    def __len__(self):
        """Implements len(ObjectListIterator)"""
        return self._maxitem

#!/usr/bin/env python # This work was created by participants in the DataONE project, and is # jointly copyrighted by participating institutions in DataONE. For # more information on DataONE, see our web site at http://dataone.org. # #   Copyright 2009-2019 DataONE # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # #   http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. Serial ObjectList Iterator.      Iterate over information about Science Objects available on Member Nodes.      This is a serial implementation. See :ref:`d1_client/ref/iterators:DataONE     Iterators` for an overview of the available iterator types and implementations. :param client: The client instance for retrieving stuff.         :type client: DataONEBaseClient or derivative         :param start: The zero based starting index value (0)         :type start: integer         :param fromDate:         :type fromDate: DateTime         :param pagesize: Number of items to retrieve in a single request (page, 500)         :type pagesize: integer         :param max_count: Maximum number of items to retrieve (all)         :type max_count: integer Implements the next() method for the iterator.          Returns the next ObjectInfo instance. Loads more if at the end of the page and         there's more pages to load. Retrieves the next page of results. Implements len(ObjectListIterator)