def iter_json_pages(self, path, page_size=1000, **params):
"""Return an iterator over JSON items from a paginated resource
Legacy resources (prior to V1) implemented a common paging interfaces for
several different resources. This method handles the details of iterating
over the paged result set, yielding only the JSON data for each item
within the aggregate resource.
:param str path: The base path to the resource being requested (e.g. /ws/Group)
:param int page_size: The number of items that should be requested for each page. A larger
page_size may mean fewer HTTP requests but could also increase the time to get a first
result back from Device Cloud.
:param params: These are additional query parameters that should be sent with each
request to Device Cloud.
"""
path = validate_type(path, *six.string_types)
page_size = validate_type(page_size, *six.integer_types)
offset = 0
remaining_size = 1 # just needs to be non-zero
while remaining_size > 0:
reqparams = {"start": offset, "size": page_size}
reqparams.update(params)
response = self.get_json(path, params=reqparams)
offset += page_size
remaining_size = int(response.get("remainingSize", "0"))
for item_json in response.get("items", []):
yield item_json
def get_filedata(self, condition=None, page_size=1000):
"""Return a generator over all results matching the provided condition
:param condition: An :class:`.Expression` which defines the condition
which must be matched on the filedata that will be retrieved from
file data store. If a condition is unspecified, the following condition
will be used ``fd_path == '~/'``. This condition will match all file
data in this accounts "home" directory (a sensible root).
:type condition: :class:`.Expression` or None
:param int page_size: The number of results to fetch in a single page. Regardless
of the size specified, :meth:`.get_filedata` will continue to fetch pages
and yield results until all items have been fetched.
:return: Generator yielding :class:`.FileDataObject` instances matching the
provided conditions.
"""
condition = validate_type(condition, type(None), Expression, *six.string_types)
page_size = validate_type(page_size, *six.integer_types)
if condition is None:
condition = (fd_path == "~/") # home directory
params = {"embed": "true", "condition": condition.compile()}
for fd_json in self._conn.iter_json_pages("/ws/FileData", page_size=page_size, **params):
yield FileDataObject.from_json(self, fd_json)
def get_filedata(self, condition=None, page_size=1000):
"""Return a generator over all results matching the provided condition
:param condition: An :class:`.Expression` which defines the condition
which must be matched on the filedata that will be retrieved from
file data store. If a condition is unspecified, the following condition
will be used ``fd_path == '~/'``. This condition will match all file
data in this accounts "home" directory (a sensible root).
:type condition: :class:`.Expression` or None
:param int page_size: The number of results to fetch in a single page. Regardless
of the size specified, :meth:`.get_filedata` will continue to fetch pages
and yield results until all items have been fetched.
:return: Generator yielding :class:`.FileDataObject` instances matching the
provided conditions.
"""
condition = validate_type(condition, type(None), Expression,
*six.string_types)
page_size = validate_type(page_size, *six.integer_types)
if condition is None:
condition = (fd_path == "~/") # home directory
params = {"embed": "true", "condition": condition.compile()}
for fd_json in self._conn.iter_json_pages("/ws/FileData",
page_size=page_size,
**params):
yield FileDataObject.from_json(self, fd_json)
def delete_datapoints_in_time_range(self, start_dt=None, end_dt=None):
"""Delete datapoints from this stream between the provided start and end times
If neither a start or end time is specified, all data points in the stream
will be deleted.
:param start_dt: The datetime after which data points should be deleted or None
if all data points from the beginning of time should be deleted.
:param end_dt: The datetime before which data points should be deleted or None
if all data points until the current time should be deleted.
:raises devicecloud.DeviceCloudHttpException: in the case of an unexpected http error
"""
start_dt = to_none_or_dt(validate_type(start_dt, datetime.datetime, type(None)))
end_dt = to_none_or_dt(validate_type(end_dt, datetime.datetime, type(None)))
params = {}
if start_dt is not None:
params['startTime'] = isoformat(start_dt)
if end_dt is not None:
params['endTime'] = isoformat(end_dt)
self._conn.delete("/ws/DataPoint/{stream_id}{querystring}".format(
stream_id=self.get_stream_id(),
querystring="?" + urllib.parse.urlencode(params) if params else "",
))
def __init__(self, data, stream_id=None, description=None, timestamp=None,
quality=None, location=None, data_type=None, units=None, dp_id=None,
customer_id=None, server_timestamp=None):
self._stream_id = None # invariant: always string or None
self._data = None # invariant: could be any type, with conversion applied lazily
self._description = None # invariant: always string or None
self._timestamp = None # invariant: always datetime object or None
self._quality = None # invariant: always integer (32-bit) or None
self._location = None # invariant: 3-tuple<float> or None
self._data_type = None # invariant: always string in set of types or None
self._units = None # invariant: always string or None
self._dp_id = None # invariant: always string or None
self._customer_id = None # invariant: always string or None
self._server_timestamp = None # invariant: always None or datetime
# all of these could be set via public API
self.set_stream_id(stream_id)
self.set_data(data)
self.set_description(description)
self.set_timestamp(timestamp)
self.set_quality(quality)
self.set_location(location)
self.set_data_type(data_type)
self.set_units(units)
# these should only ever be read by the public API
self._dp_id = validate_type(dp_id, type(None), *six.string_types)
self._customer_id = validate_type(customer_id, type(None), *six.string_types)
self._server_timestamp = to_none_or_dt(server_timestamp)
def iter_json_pages(self, path, page_size=1000, **params):
"""Return an iterator over JSON items from a paginated resource
Legacy resources (prior to V1) implemented a common paging interfaces for
several different resources. This method handles the details of iterating
over the paged result set, yielding only the JSON data for each item
within the aggregate resource.
:param str path: The base path to the resource being requested (e.g. /ws/Group)
:param int page_size: The number of items that should be requested for each page. A larger
page_size may mean fewer HTTP requests but could also increase the time to get a first
result back from the device cloud.
:param params: These are additional query parameters that should be sent with each
request to the device cloud.
"""
path = validate_type(path, *six.string_types)
page_size = validate_type(page_size, *six.integer_types)
offset = 0
remaining_size = 1 # just needs to be non-zero
while remaining_size > 0:
reqparams = {"start": offset, "size": page_size}
reqparams.update(params)
response = self.get_json(path, params=reqparams)
offset += page_size
remaining_size = int(response.get("remainingSize", "0"))
for item_json in response.get("items", []):
yield item_json
def write_file(self,
path,
name,
data,
content_type=None,
archive=False,
raw=False):
"""Write a file to the file data store at the given path
:param str path: The path (directory) into which the file should be written.
:param str name: The name of the file to be written.
:param data: The binary data that should be written into the file.
:type data: str (Python2) or bytes (Python3)
:param content_type: The content type for the data being written to the file. May
be left unspecified.
:type content_type: str or None
:param bool archive: If true, history will be retained for various revisions of this
file. If this is not required, leave as false.
:param bool raw: If true, skip the FileData XML headers (necessary for binary files)
"""
path = validate_type(path, *six.string_types)
name = validate_type(name, *six.string_types)
data = validate_type(data, six.binary_type)
content_type = validate_type(content_type, type(None),
*six.string_types)
archive_str = "true" if validate_type(archive, bool) else "false"
if not path.startswith("/"):
path = "/" + path
if not path.endswith("/"):
path += "/"
name = name.lstrip("/")
sio = six.moves.StringIO()
if not raw:
if six.PY3:
base64_encoded_data = base64.encodebytes(data).decode('utf-8')
else:
base64_encoded_data = base64.encodestring(data)
sio.write("<FileData>")
if content_type is not None:
sio.write(
"<fdContentType>{}</fdContentType>".format(content_type))
sio.write("<fdType>file</fdType>")
sio.write("<fdData>{}</fdData>".format(base64_encoded_data))
sio.write("<fdArchive>{}</fdArchive>".format(archive_str))
sio.write("</FileData>")
else:
sio.write(data)
params = {"type": "file", "archive": archive_str}
self._conn.put("/ws/FileData{path}{name}".format(path=path, name=name),
sio.getvalue(),
params=params)
def write_file(self, path, name, data, content_type=None, archive=False,
raw=False):
"""Write a file to the file data store at the given path
:param str path: The path (directory) into which the file should be written.
:param str name: The name of the file to be written.
:param data: The binary data that should be written into the file.
:type data: str (Python2) or bytes (Python3)
:param content_type: The content type for the data being written to the file. May
be left unspecified.
:type content_type: str or None
:param bool archive: If true, history will be retained for various revisions of this
file. If this is not required, leave as false.
:param bool raw: If true, skip the FileData XML headers (necessary for binary files)
"""
path = validate_type(path, *six.string_types)
name = validate_type(name, *six.string_types)
data = validate_type(data, six.binary_type)
content_type = validate_type(content_type, type(None), *six.string_types)
archive_str = "true" if validate_type(archive, bool) else "false"
if not path.startswith("/"):
path = "/" + path
if not path.endswith("/"):
path += "/"
name = name.lstrip("/")
sio = six.moves.StringIO()
if not raw:
if six.PY3:
base64_encoded_data = base64.encodebytes(data).decode('utf-8')
else:
base64_encoded_data = base64.encodestring(data)
sio.write("<FileData>")
if content_type is not None:
sio.write("<fdContentType>{}</fdContentType>".format(content_type))
sio.write("<fdType>file</fdType>")
sio.write("<fdData>{}</fdData>".format(base64_encoded_data))
sio.write("<fdArchive>{}</fdArchive>".format(archive_str))
sio.write("</FileData>")
else:
sio.write(data)
params = {
"type": "file",
"archive": archive_str
}
self._conn.put(
"/ws/FileData{path}{name}".format(path=path, name=name),
sio.getvalue(),
params=params)
def walk(self, root="~/"):
"""Emulation of os.walk behavior against the device cloud filedata store
This method will yield tuples in the form ``(dirpath, FileDataDirectory's, FileData's)``
recursively in pre-order (depth first from top down).
:param str root: The root path from which the search should commence. By default, this
is the root directory for this device cloud account (~).
:return: Generator yielding 3-tuples of dirpath, directories, and files
:rtype: 3-tuple in form (dirpath, list of :class:`FileDataDirectory`, list of :class:`FileDataFile`)
"""
root = validate_type(root, *six.string_types)
directories = []
files = []
# fd_path is real picky
query_fd_path = root
if not query_fd_path.endswith("/"):
query_fd_path += "/"
for fd_object in self.get_filedata(fd_path == query_fd_path):
if fd_object.get_type() == "directory":
directories.append(fd_object)
else:
files.append(fd_object)
# Yield the walk results for this level of the tree
yield (root, directories, files)
# recurse on each directory and yield results up the chain
for directory in directories:
for dirpath, directories, files in self.walk(directory.get_full_path()):
yield (dirpath, directories, files)
def set_data_type(self, data_type):
"""Set the data type for ths data point
The data type is actually associated with the stream itself and should
not (generally) vary on a point-per-point basis. That being said, if
creating a new stream by writing a datapoint, it may be beneficial to
include this information.
The data type provided should be in the set of available data types of
{ INTEGER, LONG, FLOAT, DOUBLE, STRING, BINARY, UNKNOWN }.
"""
validate_type(data_type, type(None), *six.string_types)
if isinstance(data_type, *six.string_types):
data_type = str(data_type).upper()
if not data_type in ({None} | set(DSTREAM_TYPE_MAP.keys())):
raise ValueError("Provided data type not in available set of types")
self._data_type = data_type
def __init__(self, conn, stream_id, cached_data=None):
if not isinstance(cached_data, (type(None), dict)):
raise TypeError("cached_data should be dict or None")
stream_id = validate_type(stream_id, *six.string_types).lstrip('/')
self._conn = conn
self._stream_id = stream_id # Invariant: string with any leading '/' stripped
self._cached_data = cached_data
def set_units(self, unit):
"""Set the unit for this data point
Unit, as with data_type, are actually associated with the stream and not
the individual data point. As such, changing this within a stream is
not encouraged. Setting the unit on the data point is useful when the
stream might be created with the write of a data point.
"""
self._units = validate_type(unit, type(None), *six.string_types)
def delete_datapoint(self, datapoint):
"""Delete the provided datapoint from this stream
:raises devicecloud.DeviceCloudHttpException: in the case of an unexpected http error
"""
datapoint = validate_type(datapoint, DataPoint)
self._conn.delete("/ws/DataPoint/{stream_id}/{datapoint_id}".format(
stream_id=self.get_stream_id(),
datapoint_id=datapoint.get_id(),
))
def get_filedata(self, condition=None, page_size=1000):
"""Return a generator over all results matching the provided condition
:param condition: An :class:`.Expression` which defines the condition
which must be matched on the filedata that will be retrieved from
file data store. If a condition is unspecified, the following condition
will be used ``fd_path == '~/'``. This condition will match all file
data in this accounts "home" directory (a sensible root).
:type condition: :class:`.Expression` or None
:param int page_size: The number of results to fetch in a single page. Regardless
of the size specified, :meth:`.get_filedata` will continue to fetch pages
and yield results until all items have been fetched.
:return: Generator yielding :class:`.FileDataObject` instances matching the
provided conditions.
"""
condition = validate_type(condition, type(None), Expression, *six.string_types)
page_size = validate_type(page_size, *six.integer_types)
offset = 0
remaining_size = 1 # just needs to be non-zero
if condition is None:
condition = (fd_path == "~/") # home directory
while remaining_size > 0:
response = self._conn.get_json(
"/ws/FileData?embed=true"
"&start={offset}"
"&size={page_size}"
"&condition={condition}".format(
condition=condition.compile(),
page_size=page_size,
offset=offset))
offset += page_size
remaining_size = int(response.get("remainingSize", "0"))
for fd_json in response.get("items", []):
yield FileDataObject.from_json(self, fd_json)
def get_devices(self, condition=None, page_size=1000):
"""Iterates over each :class:`Device` for this device cloud account
Examples::
# get a list of all devices
all_devices = list(dc.devicecore.get_devices())
# build a mapping of devices by their vendor id using a
# dict comprehension
devices = dc.devicecore.get_devices() # generator object
devs_by_vendor_id = {d.get_vendor_id(): d for d in devices}
# iterate over all devices in 'minnesota' group and
# print the device mac and location
for device in dc.get_devices(group_path == 'minnesota'):
print "%s at %s" % (device.get_mac(), device.get_location())
:param condition: An :class:`.Expression` which defines the condition
which must be matched on the devicecore. If unspecified,
an iterator over all devices will be returned.
:param int page_size: The number of results to fetch in a
single page. In general, the default will suffice.
:returns: Iterator over each :class:`~Device` in this device cloud
account in the form of a generator object.
"""
condition = validate_type(condition, type(None), Expression,
*six.string_types)
page_size = validate_type(page_size, *six.integer_types)
params = {"embed": "true"}
if condition is not None:
params["condition"] = condition.compile()
for device_json in self._conn.iter_json_pages("/ws/DeviceCore",
page_size=page_size,
**params):
yield Device(self._conn, self._sci, device_json)
def get_group_tree_root(self, page_size=1000):
r"""Return the root group for this accounts' group tree
This will return the root group for this tree but with all links
between nodes (i.e. children starting from root) populated.
Examples::
# print the group hierarchy to stdout
dc.devicecore.get_group_tree_root().print_subtree()
# gather statistics about devices in each group including
# the count from its subgroups (recursively)
#
# This also shows how you can go from a group reference to devices
# for that particular group.
stats = {} # group -> devices count including children
def count_nodes(group):
count_for_this_node = \
len(list(dc.devicecore.get_devices(group_path == group.get_path())))
subnode_count = 0
for child in group.get_children():
subnode_count += count_nodes(child)
total = count_for_this_node + subnode_count
stats[group] = total
return total
count_nodes(dc.devicecore.get_group_tree_root())
:param int page_size: The number of results to fetch in a
single page. In general, the default will suffice.
:returns: The root group for this device cloud accounts group
hierarchy.
"""
# first pass, build mapping
group_map = {} # map id -> group
page_size = validate_type(page_size, *six.integer_types)
for group in self.get_groups(page_size=page_size):
group_map[group.get_id()] = group
# second pass, find root and populate list of children for each node
root = None
for group_id, group in group_map.items():
if group.is_root():
root = group
else:
parent = group_map[group.get_parent_id()]
parent.add_child(group)
return root
def get_group_tree_root(self, page_size=1000):
r"""Return the root group for this accounts' group tree
This will return the root group for this tree but with all links
between nodes (i.e. children starting from root) populated.
Examples::
# print the group hierarchy to stdout
dc.devicecore.get_group_tree_root().print_subtree()
# gather statistics about devices in each group including
# the count from its subgroups (recursively)
#
# This also shows how you can go from a group reference to devices
# for that particular group.
stats = {} # group -> devices count including children
def count_nodes(group):
count_for_this_node = \
len(list(dc.devicecore.get_devices(group_path == group.get_path())))
subnode_count = 0
for child in group.get_children():
subnode_count += count_nodes(child)
total = count_for_this_node + subnode_count
stats[group] = total
return total
count_nodes(dc.devicecore.get_group_tree_root())
:param int page_size: The number of results to fetch in a
single page. In general, the default will suffice.
:returns: The root group for this device cloud accounts group
hierarchy.
"""
# first pass, build mapping
group_map = {} # map id -> group
page_size = validate_type(page_size, *six.integer_types)
for group in self.get_groups(page_size=page_size):
group_map[group.get_id()] = group
# second pass, find root and populate list of children for each node
root = None
for group_id, group in group_map.items():
if group.is_root():
root = group
else:
parent = group_map[group.get_parent_id()]
parent.add_child(group)
return root
def set_quality(self, quality):
"""Set the quality for this sample
Quality is stored on the device cloud as a 32-bit integer, so the input
to this function should be either None, an integer, or a string that can
be converted to an integer.
"""
if isinstance(quality, *six.string_types):
quality = int(quality)
elif isinstance(quality, float):
quality = int(quality)
self._quality = validate_type(quality, type(None), *six.integer_types)
def delete_file(self, path):
"""Delete a file or directory from the filedata store
This method removes a file or directory (recursively) from
the filedata store.
:param path: The path of the file or directory to remove
from the file data store.
"""
path = validate_type(path, *six.string_types)
if not path.startswith("/"):
path = "/" + path
self._conn.delete("/ws/FileData{path}".format(path=path))
def delete_file(self, path):
"""Delete a file or directory from the filedata store
This method removes a file or directory (recursively) from
the filedata store.
:param path: The path of the file or directory to remove
from the file data store.
"""
path = validate_type(path, *six.string_types)
if not path.startswith("/"):
path = "/" + path
self._conn.delete("/ws/FileData{path}".format(path=path))
def get_devices(self, condition=None, page_size=1000):
"""Iterates over each :class:`Device` for this device cloud account
Examples::
# get a list of all devices
all_devices = list(dc.devicecore.get_devices())
# build a mapping of devices by their vendor id using a
# dict comprehension
devices = dc.devicecore.get_devices() # generator object
devs_by_vendor_id = {d.get_vendor_id(): d for d in devices}
# iterate over all devices in 'minnesota' group and
# print the device mac and location
for device in dc.get_devices(group_path == 'minnesota'):
print "%s at %s" % (device.get_mac(), device.get_location())
:param condition: An :class:`.Expression` which defines the condition
which must be matched on the devicecore. If unspecified,
an iterator over all devices will be returned.
:param int page_size: The number of results to fetch in a
single page. In general, the default will suffice.
:returns: Iterator over each :class:`~Device` in this device cloud
account in the form of a generator object.
"""
condition = validate_type(condition, type(None), Expression, *six.string_types)
page_size = validate_type(page_size, *six.integer_types)
params = {"embed": "true"}
if condition is not None:
params["condition"] = condition.compile()
for device_json in self._conn.iter_json_pages("/ws/DeviceCore", page_size=page_size, **params):
yield Device(self._conn, self._sci, device_json)
def create_stream(self,
stream_id,
data_type,
description=None,
data_ttl=None,
rollup_ttl=None,
units=None):
"""Create a new data stream on the device cloud
This method will attempt to create a new data stream on the device cloud.
This method will only succeed if the stream does not already exist.
:param str stream_id: The path/id of the stream being created on the device cloud.
:param str data_type: The type of this stream. This must be in the set
`{ INTEGER, LONG, FLOAT, DOUBLE, STRING, BINARY, UNKNOWN }`. These values are
available in constants like :attr:`~STREAM_TYPE_INTEGER`.
:param str description: An optional description of this stream. See :meth:`~DataStream.get_description`.
:param int data_ttl: The TTL for data points in this stream. See :meth:`~DataStream.get_data_ttl`.
:param int rollup_ttl: The TTL for performing rollups on data. See :meth:~DataStream.get_rollup_ttl`.
:param str units: Units for data in this stream. See :meth:`~DataStream.get_units`
"""
stream_id = validate_type(stream_id, *six.string_types)
data_type = validate_type(data_type, type(None), *six.string_types)
if isinstance(data_type, *six.string_types):
data_type = str(data_type).upper()
if not data_type in (set([
None,
]) | set(list(DSTREAM_TYPE_MAP.keys()))):
raise ValueError("data_type %r is not valid" % data_type)
description = validate_type(description, type(None), *six.string_types)
data_ttl = validate_type(data_ttl, type(None), *six.integer_types)
rollup_ttl = validate_type(rollup_ttl, type(None), *six.integer_types)
units = validate_type(units, type(None), *six.string_types)
sio = StringIO()
sio.write("<DataStream>")
conditional_write(sio, "<streamId>{}</streamId>", stream_id)
conditional_write(sio, "<dataType>{}</dataType>", data_type)
conditional_write(sio, "<description>{}</description>", description)
conditional_write(sio, "<dataTtl>{}</dataTtl>", data_ttl)
conditional_write(sio, "<rollupTtl>{}</rollupTtl>", rollup_ttl)
conditional_write(sio, "<units>{}</units>", units)
sio.write("</DataStream>")
self._conn.post("/ws/DataStream", sio.getvalue())
logger.info("Data stream (%s) created successfully", stream_id)
stream = DataStream(self._conn, stream_id)
return stream
def create_stream(self, stream_id, data_type, description=None, data_ttl=None,
rollup_ttl=None, units=None):
"""Create a new data stream on the device cloud
This method will attempt to create a new data stream on the device cloud.
This method will only succeed if the stream does not already exist.
:param str stream_id: The path/id of the stream being created on the device cloud.
:param str data_type: The type of this stream. This must be in the set
`{ INTEGER, LONG, FLOAT, DOUBLE, STRING, BINARY, UNKNOWN }`. These values are
available in constants like :attr:`~STREAM_TYPE_INTEGER`.
:param str description: An optional description of this stream. See :meth:`~DataStream.get_description`.
:param int data_ttl: The TTL for data points in this stream. See :meth:`~DataStream.get_data_ttl`.
:param int rollup_ttl: The TTL for performing rollups on data. See :meth:~DataStream.get_rollup_ttl`.
:param str units: Units for data in this stream. See :meth:`~DataStream.get_units`
"""
stream_id = validate_type(stream_id, *six.string_types)
data_type = validate_type(data_type, type(None), *six.string_types)
if isinstance(data_type, *six.string_types):
data_type = str(data_type).upper()
if not data_type in (set([None, ]) | set(list(DSTREAM_TYPE_MAP.keys()))):
raise ValueError("data_type %r is not valid" % data_type)
description = validate_type(description, type(None), *six.string_types)
data_ttl = validate_type(data_ttl, type(None), *six.integer_types)
rollup_ttl = validate_type(rollup_ttl, type(None), *six.integer_types)
units = validate_type(units, type(None), *six.string_types)
sio = StringIO()
sio.write("<DataStream>")
conditional_write(sio, "<streamId>{}</streamId>", stream_id)
conditional_write(sio, "<dataType>{}</dataType>", data_type)
conditional_write(sio, "<description>{}</description>", description)
conditional_write(sio, "<dataTtl>{}</dataTtl>", data_ttl)
conditional_write(sio, "<rollupTtl>{}</rollupTtl>", rollup_ttl)
conditional_write(sio, "<units>{}</units>", units)
sio.write("</DataStream>")
self._conn.post("/ws/DataStream", sio.getvalue())
logger.info("Data stream (%s) created successfully", stream_id)
stream = DataStream(self._conn, stream_id)
return stream
def read(self, start_time=None, end_time=None, use_client_timeline=True, newest_first=True,
rollup_interval=None, rollup_method=None, timezone=None, page_size=1000):
"""Read one or more DataPoints from a stream
.. warning::
The data points from the device cloud is a paged data set. When iterating over the
result set there could be delays when we hit the end of a page. If this is undesirable,
the caller should collect all results into a data structure first before iterating over
the result set.
:param start_time: The start time for the window of data points to read. None means
that we should start with the oldest data available.
:type start_time: :class:`datetime.datetime` or None
:param end_time: The end time for the window of data points to read. None means
that we should include all points received until this point in time.
:type end_time: :class:`datetime.datetime` or None
:param bool use_client_timeline: If True, the times used will be those provided by
clients writing data points into the cloud (which also default to server time
if the a timestamp was not included by the client). This is usually what you
want. If False, the server timestamp will be used which records when the data
point was received.
:param bool newest_first: If True, results will be ordered from newest to oldest (descending order).
If False, results will be returned oldest to newest.
:param rollup_interval: the roll-up interval that should be used if one is desired at all. Rollups
will not be performed if None is specified for the interval. Valid roll-up interval values
are None, "half", "hourly", "day", "week", and "month". See `DataPoints documentation
<http://ftp1.digi.com/support/documentation/html/90002008/90002008_P/Default.htm#ProgrammingTopics/DataStreams.htm#DataPoints>`_
for additional details on these values.
:type rollup_interval: str or None
:param rollup_method: The aggregation applied to values in the points within the specified
rollup_interval. Available methods are None, "sum", "average", "min", "max", "count", and
"standarddev". See `DataPoint documentation
<http://ftp1.digi.com/support/documentation/html/90002008/90002008_P/Default.htm#ProgrammingTopics/DataStreams.htm#DataPoints>`_
for additional details on these values.
:type rollup_method: str or None
:param timezone: timezone for calculating roll-ups. This determines roll-up interval
boundaries and only applies to roll-ups of a day or larger (for example, day,
week, or month). Note that it does not apply to the startTime and endTime parameters.
See the `Timestamps <http://ftp1.digi.com/support/documentation/html/90002008/90002008_P/Default.htm#ProgrammingTopics/DataStreams.htm#timestamp>`_
and `Supported Time Zones <http://ftp1.digi.com/support/documentation/html/90002008/90002008_P/Default.htm#ProgrammingTopics/DataStreams.htm#TimeZones>`_
sections for more information.
:type timezone: str or None
:param int page_size: The number of results that we should attempt to retrieve from the
device cloud in each page. Generally, this can be left at its default value unless
you have a good reason to change the parameter for performance reasons.
:returns: A generator object which one can iterate over the DataPoints read.
"""
is_rollup = False
if (rollup_interval is not None) or (rollup_method is not None):
is_rollup = True
numeric_types = [
STREAM_TYPE_INTEGER,
STREAM_TYPE_LONG,
STREAM_TYPE_FLOAT,
STREAM_TYPE_DOUBLE,
STREAM_TYPE_STRING,
STREAM_TYPE_BINARY,
STREAM_TYPE_UNKNOWN,
]
if self.get_data_type(use_cached=True) not in numeric_types:
raise InvalidRollupDatatype('Rollups only support numerical DataPoints')
# Validate function inputs
start_time = to_none_or_dt(validate_type(start_time, datetime.datetime, type(None)))
end_time = to_none_or_dt(validate_type(end_time, datetime.datetime, type(None)))
use_client_timeline = validate_type(use_client_timeline, bool)
newest_first = validate_type(newest_first, bool)
rollup_interval = validate_type(rollup_interval, type(None), *six.string_types)
if not rollup_interval in {None,
ROLLUP_INTERVAL_HALF,
ROLLUP_INTERVAL_HOUR,
ROLLUP_INTERVAL_DAY,
ROLLUP_INTERVAL_WEEK,
ROLLUP_INTERVAL_MONTH, }:
raise ValueError("Invalid rollup_interval %r provided" % (rollup_interval, ))
rollup_method = validate_type(rollup_method, type(None), *six.string_types)
if not rollup_method in {None,
ROLLUP_METHOD_SUM,
ROLLUP_METHOD_AVERAGE,
ROLLUP_METHOD_MIN,
ROLLUP_METHOD_MAX,
ROLLUP_METHOD_COUNT,
ROLLUP_METHOD_STDDEV}:
raise ValueError("Invalid rollup_method %r provided" % (rollup_method, ))
timezone = validate_type(timezone, type(None), *six.string_types)
page_size = validate_type(page_size, *six.integer_types)
# Remember that there could be multiple pages of data and we want to provide
# in iterator over the result set. To start the process out, we need to make
# an initial request without a page cursor. We should get one in response to
# our first request which we will use to page through the result set
query_parameters = {
'timeline': 'client' if use_client_timeline else 'server',
'order': 'descending' if newest_first else 'ascending',
'size': page_size
}
if start_time is not None:
query_parameters["startTime"] = isoformat(start_time)
if end_time is not None:
query_parameters["endTime"] = isoformat(end_time)
if rollup_interval is not None:
query_parameters["rollupInterval"] = rollup_interval
if rollup_method is not None:
query_parameters["rollupMethod"] = rollup_method
if timezone is not None:
query_parameters["timezone"] = timezone
result_size = page_size
while result_size == page_size:
# request the next page of data or first if pageCursor is not set as query param
try:
result = self._conn.get_json("/ws/DataPoint/{stream_id}?{query_params}".format(
stream_id=self.get_stream_id(),
query_params=urllib.parse.urlencode(query_parameters)
))
except DeviceCloudHttpException as http_exception:
if http_exception.response.status_code == 404:
raise NoSuchStreamException()
raise http_exception
result_size = int(result["resultSize"]) # how many are actually included here?
query_parameters["pageCursor"] = result.get("pageCursor") # will not be present if result set is empty
for item_info in result.get("items", []):
if is_rollup:
data_point = DataPoint.from_rollup_json(self, item_info)
else:
data_point = DataPoint.from_json(self, item_info)
yield data_point
def set_description(self, description):
"""Set the description for this data point"""
self._description = validate_type(description, type(None), *six.string_types)
def set_stream_id(self, stream_id):
"""Set the stream id associated with this data point"""
stream_id = validate_type(stream_id, type(None), *six.string_types)
if stream_id is not None:
stream_id = stream_id.lstrip('/')
self._stream_id = stream_id