def recreate_from_others(self, method_metas, without=None):
if without is None:
without = []
defaults = OrderedDict()
elements = OrderedDict()
required = []
# Populate the intermediate data structures
for method_meta in method_metas:
for element in method_meta.takes.elements:
if element not in without:
# Serialize it to copy it
serialized = method_meta.takes.elements[element].to_dict()
elements[element] = serialized
if element in method_meta.takes.required and element not in required:
required.append(element)
if element in method_meta.defaults:
defaults.pop(element, None)
defaults[element] = method_meta.defaults[element]
# TODO: what about returns?
# remove required args that are now defaulted
required = [r for r in required if r not in defaults]
# Update ourself from these structures
takes = MapMeta()
takes.set_elements(ElementMap(elements))
takes.set_required(required)
self.set_takes(takes)
self.set_defaults(defaults)
def replace_endpoints(self, d):
children = OrderedDict()
for k, v in d.items():
assert isinstance(k, str_), "Expected string, got %s" % (k, )
if k == "typeid":
assert v == self.typeid, \
"Dict has typeid %s but Class has %s" % (v, self.typeid)
else:
try:
object.__getattribute__(self, k)
except AttributeError:
children[k] = deserialize_object(v, self.child_type_check)
else:
raise AttributeError(
"Setting child %r would shadow an attribute" % (k, ))
self.endpoints = list(children)
for k, v in children.items():
self.set_endpoint_data(k, v, notify=False)
if self.process:
self.process.report_changes(
[self.process_path, serialize_object(self)])
def __init__(self, process, mri, parts, description=""):
super(Controller, self).__init__(mri=mri)
self.process = process
self.mri = mri
self._request_queue = Queue()
# {Part: Alarm} for current faults
self._faults = {}
# {Hook: name}
self._hook_names = {}
# {Hook: {Part: func_name}}
self._hooked_func_names = {}
self._find_hooks()
# {part_name: (field_name, Model, setter)
self.part_fields = OrderedDict()
# {name: Part}
self.parts = OrderedDict()
self._lock = RLock(self.use_cothread)
self._block = BlockModel()
self._block.meta.set_description(description)
self.set_label(mri)
for part in parts:
self.add_part(part)
self._notifier = Notifier(mri, self._lock, self._block)
self._block.set_notifier_path(self._notifier, [mri])
self._write_functions = {}
self._add_block_fields()
def __init__(self,
mri, # type: AMri
config_dir, # type: AConfigDir
hostname="localhost", # type: AHostname
port=8888, # type: APort
initial_design="", # type: AInitialDesign
description="", # type: ADescription
use_git=True, # type: AUseGit
doc_url_base=DOC_URL_BASE, # type: ADocUrlBase
poll_period=0.1 # type: APollPeriod
):
# type: (...) -> None
super(PandABlocksManagerController, self).__init__(
mri, config_dir, initial_design, description, use_git)
self._poll_period = poll_period
self._doc_url_base = doc_url_base
# {block_name: BlockData}
self._blocks_data = {}
# {block_name: {field_name: Part}}
self._blocks_parts = OrderedDict()
# src_attr -> [dest_attr]
self._listening_attrs = {}
# lut elements to be displayed or not
# {fnum: {id: visible}}
self._lut_elements = {}
# changes left over from last time
self.changes = OrderedDict()
# The PandABlock client that does the comms
self.client = PandABlocksClient(hostname, port, Queue)
# Filled in on reset
self._stop_queue = None
self._poll_spawned = None
def recreate_from_others(self, method_metas, without=()):
defaults = OrderedDict()
elements = OrderedDict()
required = []
# Populate the intermediate data structures
for method_meta in method_metas:
for element in method_meta.takes.elements:
if element not in without:
# Serialize it to copy it
serialized = method_meta.takes.elements[element].to_dict()
elements[element] = serialized
if element in method_meta.takes.required and \
element not in required:
required.append(element)
if element in method_meta.defaults:
defaults.pop(element, None)
defaults[element] = method_meta.defaults[element]
# TODO: what about returns?
# remove required args that are now defaulted
required = [r for r in required if r not in defaults]
# Update ourself from these structures
takes = MapMeta()
takes.set_elements(elements)
takes.set_required(required)
self.set_takes(takes)
self.set_defaults(defaults)
def _prepare_map_meta(args,
allow_defaults,
defaults=None,
elements=None,
required=None):
# prepare some data structures that will be used for the takes MapMeta
if defaults is None:
defaults = OrderedDict()
if elements is None:
elements = OrderedDict()
if required is None:
required = []
for index in range(0, len(args), 3):
# pick out 3 arguments
name = args[index]
check_camel_case(name)
meta = args[index + 1]
default = args[index + 2]
# store them in the right structures
elements[name] = meta
if default is REQUIRED:
required.append(name)
elif default is not OPTIONAL:
assert allow_defaults, \
"Defaults not allowed in this structure"
defaults[name] = default
# Setup the takes MapMeta and attach it to the function's MethodModel
meta = MapMeta()
meta.set_elements(elements)
meta.set_required(required)
return meta, defaults
def __init__(self, name, sync_factory):
self.set_logger_name(name)
self.name = name
self.sync_factory = sync_factory
self.q = self.create_queue()
self._blocks = OrderedDict() # block_name -> Block
self._controllers = OrderedDict() # block_name -> Controller
self._block_state_cache = Cache()
self._recv_spawned = None
self._other_spawned = []
# lookup of all Subscribe requests, ordered to guarantee subscription
# notification ordering
# {Request.generate_key(): Subscribe}
self._subscriptions = OrderedDict()
self.comms = []
self._client_comms = OrderedDict() # client comms -> list of blocks
self._handle_functions = {
Post: self._forward_block_request,
Put: self._forward_block_request,
Get: self._handle_get,
Subscribe: self._handle_subscribe,
Unsubscribe: self._handle_unsubscribe,
BlockChanges: self._handle_block_changes,
BlockRespond: self._handle_block_respond,
BlockAdd: self._handle_block_add,
BlockList: self._handle_block_list,
AddSpawned: self._add_spawned,
}
self.create_process_block()
def __init__(self, process, parts, params):
super(PandABlocksManagerController,
self).__init__(process, parts, params)
# {block_name: BlockData}
self._blocks_data = {}
# {block_name: {field_name: Part}}
self._blocks_parts = OrderedDict()
# src_attr -> [dest_attr]
self._listening_attrs = {}
# (block_name, src_field_name) -> [dest_field_name]
self._scale_offset_fields = {}
# full_src_field -> [full_dest_field]
self._mirrored_fields = {}
# fields that need to inherit UNITS, SCALE and OFFSET from upstream
self._inherit_scale = {}
self._inherit_offset = {}
# lut elements to be displayed or not
# {fnum: {id: visible}}
self._lut_elements = {}
# changes left over from last time
self.changes = OrderedDict()
# The PandABlock client that does the comms
self.client = PandABlocksClient(params.hostname, params.port, Queue)
# Filled in on reset
self._stop_queue = None
self._poll_spawned = None
def __init__(self, process, control, meta, block_name, field_name,
writeable):
super(PandABoxTablePart, self).__init__(
process, control, meta, block_name, field_name, writeable)
# Fill in the meta object with the correct headers
columns = OrderedDict()
self.fields = OrderedDict()
fields = control.get_table_fields(block_name, field_name)
for field_name, (bits_hi, bits_lo) in fields.items():
nbits = bits_hi - bits_lo + 1
if nbits < 1:
raise ValueError("Bad bits %s:%s" % (bits_hi, bits_lo))
if nbits == 1:
column_meta = BooleanArrayMeta(field_name)
widget_tag = widget("checkbox")
else:
if nbits <= 8:
dtype = "uint8"
elif nbits <= 16:
dtype = "uint16"
elif nbits <= 32:
dtype = "uint32"
elif nbits <= 64:
dtype = "uint64"
else:
raise ValueError("Bad bits %s:%s" % (bits_hi, bits_lo))
column_meta = NumberArrayMeta(dtype, field_name)
widget_tag = widget("textinput")
label, column_name = make_label_attr_name(field_name)
column_meta.set_label(label)
column_meta.set_tags([widget_tag])
columns[column_name] = column_meta
self.fields[column_name] = (bits_hi, bits_lo)
meta.set_elements(TableElementMap(columns))
def stop(self, timeout=DEFAULT_TIMEOUT):
"""Stop the process and wait for it to finish
Args:
timeout (float): Maximum amount of time to wait for each spawned
object. None means forever
"""
assert self.state == STARTED, "Process not started"
self.state = STOPPING
# Allow every controller a chance to clean up
self._run_hook(ProcessStopHook, timeout=timeout)
for s in self._spawned:
if not s.ready():
self.log.debug(
"Waiting for %s *%s **%s", s._function, s._args, s._kwargs
)
try:
s.wait(timeout=timeout)
except TimeoutError:
self.log.warning(
"Timeout waiting for %s *%s **%s", s._function, s._args, s._kwargs
)
raise
self._spawned = []
self._controllers = OrderedDict()
self._unpublished = set()
self.state = STOPPED
self.log.debug("Done process.stop()")
def replace_endpoints(self, d):
children = OrderedDict()
for k, v in d.items():
assert isinstance(k, str_), "Expected string, got %s" % (k,)
if k == "typeid":
assert v == self.typeid, \
"Dict has typeid %s but Class has %s" % (v, self.typeid)
else:
try:
object.__getattribute__(self, k)
except AttributeError:
children[k] = deserialize_object(v, self.child_type_check)
else:
raise AttributeError(
"Setting child %r would shadow an attribute" % (k,))
self.endpoints = list(children)
for k, v in children.items():
self.set_endpoint_data(k, v, notify=False)
if self.process:
self.process.report_changes(
[self.process_path, serialize_object(self)])
class StatefulStates(object):
"""The most basic Malcolm state machine"""
RESETTING = "Resetting"
DISABLED = "Disabled"
DISABLING = "Disabling"
FAULT = "Fault"
READY = "Ready"
def __init__(self):
self._allowed = OrderedDict()
# These are all the states we can possibly be in
self.possible_states = []
self.create_block_transitions()
self.create_error_disable_transitions()
def create_block_transitions(self):
self.set_allowed(self.RESETTING, self.READY)
def create_error_disable_transitions(self):
block_states = self.possible_states[:]
# Set transitions for standard states
for state in block_states:
self.set_allowed(state, self.FAULT)
self.set_allowed(state, self.DISABLING)
self.set_allowed(self.FAULT, [self.RESETTING, self.DISABLING])
self.set_allowed(self.DISABLING, [self.FAULT, self.DISABLED])
self.set_allowed(self.DISABLED, self.RESETTING)
def transition_allowed(self, initial_state, target_state):
"""
Check if a transition between two states is allowed
Args:
initial_state(str): Initial state
target_state(str): Target state
Returns:
bool: True if allowed, False if not
"""
assert initial_state in self._allowed, \
"%s is not in %s" % (initial_state, list(self._allowed))
return target_state in self._allowed[initial_state]
def set_allowed(self, initial_state, allowed_states):
"""Add an allowed transition state
Args:
initial_state (str): Initial state
allowed_states (str or list): state or list of states that
initial_state can transition to
"""
if not isinstance(allowed_states, list):
allowed_states = [allowed_states]
self._allowed.setdefault(initial_state, set()).update(allowed_states)
for state in allowed_states + [initial_state]:
if state not in self.possible_states:
self.possible_states.append(state)
def __init__(self, name: str = "Process") -> None:
self.set_logger(process_name=name)
self.name = name
self._controllers = OrderedDict() # mri -> Controller
self._unpublished: Set[str] = set() # [mri] for unpublishable controllers
self.state = STOPPED
self._spawned: List[Spawned] = []
self._spawn_count = 0
def set_parameters(self, parameters):
"""Parameters to Post to endpoint
Args:
parameters: Value to post to path
"""
if parameters is not None:
parameters = OrderedDict(
(deserialize_object(k, str_), serialize_object(v))
for k, v in parameters.items())
self.parameters = parameters
def test_error_server_and_simple_client_bad_path_dict_attribute(self):
msg = OrderedDict()
msg["typeid"] = "malcolm:core/Get:1.0"
msg["id"] = 0
msg["path"] = ("hello", "greet", "meta", "takes", "elements", "bad")
IOLoopHelper.call(self.send_message, msg)
resp = self.result.get(timeout=2)
assert resp == dict(
typeid="malcolm:core/Error:1.0",
id=0,
message=(
"UnexpectedError: Object 'hello.greet.meta.takes.elements' "
"of type %r has no attribute 'bad'") % type(OrderedDict()),
)
def to_dict(self):
d = OrderedDict()
d["typeid"] = self.typeid
# Add labels for compatibility with epics normative types
labels = []
for column_name in self.meta.elements:
column_meta = self.meta.elements[column_name]
if column_meta.label:
labels.append(column_meta.label)
else:
labels.append(column_name)
d["labels"] = labels
d.update(super(NTTable, self).to_dict())
return d
def _save_to_structure(self):
structure = OrderedDict()
structure["layout"] = OrderedDict()
for name, x, y, visible in sorted(
zip(self.layout.value.name, self.layout.value.x,
self.layout.value.y, self.layout.value.visible)):
layout_structure = OrderedDict()
layout_structure["x"] = x
layout_structure["y"] = y
layout_structure["visible"] = visible
structure["layout"][name] = layout_structure
for part_name, part_structure in sorted(self.run_hook(
self.Save, self.create_part_tasks()).items()):
structure[part_name] = part_structure
return structure
def save(self, task):
part_structure = OrderedDict()
for k in self.child:
attr = self.child[k]
if isinstance(attr, Attribute) and "config" in attr.meta.tags:
part_structure[k] = serialize_object(attr.value)
return part_structure
def setUp(self):
self.callback = MagicMock()
self.path = ["BL18I:XSPRESS3", "configure"]
self.parameters = OrderedDict()
self.parameters["filePath"] = "/path/to/file.h5"
self.parameters["exposure"] = 0.1
self.o = Post(2, self.path, self.parameters, self.callback)
def test_update_squashing(self):
# set some data
self.block["attr"] = Dummy()
self.block.attr["value"] = 32
self.block["attr2"] = Dummy()
self.block.attr2["value"] = "st"
# subscribe once and check initial response
r1 = Subscribe(path=["b"], delta=True)
r1.set_callback(Mock())
r2 = Subscribe(path=["b"])
r2.set_callback(Mock())
self.handle_subscribe(r1)
self.handle_subscribe(r2)
expected = OrderedDict()
expected["attr"] = dict(value=32)
expected["attr2"] = dict(value="st")
self.assert_called_with(r1.callback, Delta(changes=[[[], expected]]))
self.assert_called_with(r2.callback, Update(value=expected))
r1.callback.reset_mock()
r2.callback.reset_mock()
# squash two changes together
with self.o.changes_squashed:
self.block.attr["value"] = 33
self.o.add_squashed_change(["b", "attr", "value"], 33)
assert self.block.attr.value == 33
self.block.attr2["value"] = "tr"
self.o.add_squashed_change(["b", "attr2", "value"], "tr")
assert self.block.attr2.value == "tr"
self.assert_called_with(
r1.callback,
Delta(
changes=[[["attr", "value"], 33], [["attr2", "value"], "tr"]]))
expected["attr"]["value"] = 33
expected["attr2"]["value"] = "tr"
self.assert_called_with(r2.callback, Update(value=expected))
def create_info(cls, configure_func: Callable) -> ConfigureParamsInfo:
"""Create a `ConfigureParamsInfo` describing the extra parameters
that should be passed at configure"""
call_types: Dict[str, Anno] = getattr(configure_func, "call_types", {})
metas = OrderedDict()
required = []
defaults = OrderedDict()
for k, anno in call_types.items():
if k not in cls.call_types:
scls = VMeta.lookup_annotype_converter(anno)
metas[k] = scls.from_annotype(anno, writeable=True)
if anno.default is NO_DEFAULT:
required.append(k)
elif anno.default is not None:
defaults[k] = anno.default
return ConfigureParamsInfo(metas, required, defaults)
def setUp(self):
self.d1 = dict(parta=[], partb=None)
self.d2 = OrderedDict()
self.d2["parta"] = []
self.d2["partb"] = [MyInfo("v1")]
self.d2["partc"] = [MyInfo("v2"), MyInfo("v3")]
self.d2["partd"] = None
def get_changes(self):
changes = OrderedDict()
table_queues = {}
for line in self.send_recv("*CHANGES?\n"):
if line.endswith("(error)"):
field = line.split(" ", 1)[0]
val = Exception
elif "<" in line:
# table
field = line.rstrip("<")
val = None
table_queues[field] = self.send("%s?\n" % field)
elif "=" in line:
field, val = line.split("=", 1)
else:
self.log_warning("Can't parse line %r of changes", line)
continue
# TODO: Goes in server
if val in ("POSITIONS.ZERO", "BITS.ZERO"):
val = "ZERO"
elif val == "BITS.ONE":
val = "ONE"
changes[field] = val
for field, q in table_queues.items():
changes[field] = self.recv(q)
return changes
def from_table(
cls,
table_cls: Type[Table],
description: str,
widget: Widget = None,
writeable: List[str] = [],
extra_tags: List[str] = [],
) -> "TableMeta":
"""Create a TableMeta object, using a Table subclass as the spec
Args:
table_cls: The Table class to read __init__ args from
description: The description of the created Meta
widget: The widget of the created Meta
writeable: A list of the writeable field names. If there are any
writeable fields then the whole Meta is writeable
extra_tags: A list of tags to be added to the table meta
"""
elements = OrderedDict()
for k, ct in table_cls.call_types.items():
subclass = cls.lookup_annotype_converter(ct)
elements[k] = subclass.from_annotype(ct, writeable=k in writeable)
ret = cls(description=description, elements=elements, writeable=bool(writeable))
if widget is None:
widget = ret.default_widget()
tags = [widget.tag()]
tags.extend(extra_tags)
ret.set_tags(tags)
ret.set_table_cls(table_cls)
return ret
def __init__(self, process):
self.process = process
self.q = self.process.create_queue()
self._current_id = 1
self.requests = OrderedDict()
self.add_spawn_function(self.send_loop,
self.make_default_stop_func(self.q))
def set_elements(self, elements):
"""Set the elements dict from a serialized dict"""
deserialized = OrderedDict()
for k, v in elements.items():
if k != "typeid":
k = deserialize_object(k, str_)
v = deserialize_object(v, VMeta)
if not v.label:
v.set_label(camel_to_title(k))
deserialized[k] = v
if hasattr(self, "elements"):
# Stop old elements notifying
for k, v in self.elements.items():
v.set_notifier_path(None, ())
for k, v in deserialized.items():
v.set_notifier_path(self.notifier, self.path + ["elements", k])
return self.set_endpoint_data("elements", deserialized)
def get_table_fields(self, block, field):
fields = OrderedDict()
for line in self.send_recv("%s.%s.FIELDS?\n" % (block, field)):
bits_str, name = line.split(" ", 1)
name = name.strip()
bits = tuple(int(x) for x in bits_str.split(":"))
fields[name] = bits
return fields
def test_init(self):
expected = OrderedDict()
expected['Resetting'] = {'Ready', 'Fault', 'Disabling'}
expected['Ready'] = {"Fault", "Disabling"}
expected['Fault'] = {"Resetting", "Disabling"}
expected['Disabling'] = {"Disabled", "Fault"}
expected['Disabled'] = {"Resetting"}
assert self.o._allowed == expected
def set_elements(self, elements):
"""Set the elements dict from a serialized dict"""
deserialized = OrderedDict()
for k, v in elements.items():
if k != "typeid":
k = deserialize_object(k, str_)
deserialized[k] = deserialize_object(v, VArrayMeta)
return self.set_endpoint_data("elements", deserialized)
def create_attribute_models(self):
for data in super(ManagerController, self).create_attribute_models():
yield data
assert os.path.isdir(self.params.configDir), \
"%s is not a directory" % self.params.configDir
if not os.path.isdir(os.path.join(self.params.configDir, ".git")):
# Try and make it a git repo, don't care if it fails
self._run_git_cmd("init")
self._run_git_cmd("commit", "--allow-empty", "-m", "Created repo")
# Create writeable attribute table for the layout info we need
elements = OrderedDict()
elements["name"] = StringArrayMeta("Name of layout part")
elements["mri"] = StringArrayMeta("Malcolm full name of child block")
elements["x"] = NumberArrayMeta(
"float64", "X Coordinate of child block")
elements["y"] = NumberArrayMeta(
"float64", "Y Coordinate of child block")
elements["visible"] = BooleanArrayMeta("Whether child block is visible")
layout_table_meta = TableMeta(
"Layout of child blocks", elements=elements,
tags=[widget("flowgraph")])
layout_table_meta.set_writeable_in(ss.READY)
self.layout = layout_table_meta.create_attribute_model()
yield "layout", self.layout, self.set_layout
# Create writeable attribute for loading an existing layout
design_meta = ChoiceMeta(
"Design name to load", tags=[config(), widget("combo")])
design_meta.set_writeable_in(ss.READY)
self.design = design_meta.create_attribute_model()
yield "design", self.design, self.set_design
# Create writeable attribute table for the exported fields
elements = OrderedDict()
elements["name"] = ChoiceArrayMeta("Name of exported block.field")
elements["exportName"] = StringArrayMeta(
"Name of the field within current block")
exports_table_meta = TableMeta(
"Exported fields of child blocks", tags=[widget("table")],
elements=elements)
exports_table_meta.set_writeable_in(ss.READY)
self.exports = exports_table_meta.create_attribute_model()
yield "exports", self.exports, self.set_exports
# Create read-only indicator for when things are modified
modified_meta = BooleanMeta(
"Whether the design is modified", tags=[widget("led")])
self.modified = modified_meta.create_attribute_model()
yield "modified", self.modified, None
def test_init(self):
expected = OrderedDict()
expected["Resetting"] = {"Ready", "Fault", "Disabling"}
expected["Ready"] = {"Fault", "Disabling"}
expected["Fault"] = {"Resetting", "Disabling"}
expected["Disabling"] = {"Disabled", "Fault"}
expected["Disabled"] = {"Resetting"}
assert self.o._allowed == expected
def wait_hooks(
logger: Optional[logging.Logger],
hook_queue: Queue,
hook_spawned: List[Hook],
timeout: float = None,
exception_check: bool = True,
) -> Dict[str, List[Info]]:
# timeout is time to wait for spawned processes to complete on abort,
# not time for them to run for
# Wait for them all to finish
return_dict = OrderedDict()
for spawned_hook in hook_spawned:
return_dict[spawned_hook.child.name] = None
start = time.time()
hook_spawned_set = set(hook_spawned)
while hook_spawned_set:
hook: Hook
ret: Any
hook, ret = hook_queue.get()
hook_spawned_set.remove(hook)
# Wait for the process to terminate
assert hook.spawned, "No spawned process"
hook.spawned.wait(timeout)
duration = time.time() - start
if logger:
if hook_spawned_set:
logger.debug(
"%s: Child %s returned %r after %ss. Still waiting for %s",
hook.name,
hook.child.name,
ret,
duration,
[h.child.name for h in hook_spawned_set],
)
else:
logger.debug(
"%s: Child %s returned %r after %ss. Returning...",
hook.name,
hook.child.name,
ret,
duration,
)
if isinstance(ret, Exception) and exception_check:
if not isinstance(ret, AbortedError):
# If AbortedError, all tasks have already been stopped.
# Got an error, so stop and wait all hook runners
for h in hook_spawned:
h.stop()
# Wait for them to finish
for h in hook_spawned:
assert h.spawned, "No spawned functions"
h.spawned.wait(timeout)
raise ret
else:
return_dict[hook.child.name] = ret
return return_dict
def save(self, context):
child = context.block_view(self.params.mri)
part_structure = OrderedDict()
for k in child:
attr = getattr(child, k)
if isinstance(attr, Attribute) and "config" in attr.meta.tags:
part_structure[k] = serialize_object(attr.value)
self.saved_structure = part_structure
return part_structure
def execute(self, args):
self.log_debug("Execute %s method called on [%s] with: %s", self._method, self._block, args)
self.log_debug("Structure: %s", args.getStructureDict())
# Acquire the lock
with self._lock:
try:
# We now need to create the Post message and execute it
endpoint = [self._block, self._method]
request = Post(None, self._server.q, endpoint, self.parse_variants(args.toDict(True)))
request.set_id(self._id)
self._server.process.q.put(request)
# Now wait for the Post reply
self.log_debug("Waiting for reply")
self.wait_for_reply(timeout=None)
self.log_debug("Reply received %s %s", type(self._response), self._response)
response_dict = OrderedDict()
if isinstance(self._response, Return):
response_dict = self._response["value"]
self.log_debug("Response value : %s", response_dict)
elif isinstance(self._response, Error):
response_dict = self._response.to_dict()
response_dict.pop("id")
if not response_dict:
pv_object = pvaccess.PvObject(OrderedDict(), 'malcolm:core/Map:1.0')
else:
#pv_object = self._server.dict_to_structure(response_dict)
#self.log_debug("Pv Object structure created")
#self.log_debug("%s", self._server.strip_type_id(response_dict))
#pv_object.set(self._server.strip_type_id(response_dict))
pv_object = self._server.dict_to_pv_object(response_dict)
self.log_debug("Pv Object value set: %s", pv_object)
# Add this RPC to the purge list
#self._server.register_dead_rpc(self._id)
return pv_object
except Exception:
self.log_exception("Request %s failed", self._request)
def __init__(self):
self.set_logger_name(type(self).__name__)
self.allowed_transitions = OrderedDict()
self.busy_states = []
assert self.AFTER_RESETTING is not None, \
"No AFTER_RESETTING state given"
self.set_allowed(self.RESETTING, self.AFTER_RESETTING)
self.set_busy(self.RESETTING)
self.create_states()
custom_states = list(self.allowed_transitions) + [self.AFTER_RESETTING]
# Set transitions for standard states
for state in custom_states:
self.set_allowed(state, self.FAULT)
self.set_allowed(state, self.DISABLING)
self.set_allowed(self.FAULT, [self.RESETTING, self.DISABLING])
self.set_allowed(self.DISABLING, [self.FAULT, self.DISABLED])
self.set_allowed(self.DISABLED, self.RESETTING)
# These are all the states we can possibly be in
self.possible_states = list(self.allowed_transitions)
def __init__(self, process, control):
self.set_logger_name("PandABoxPoller(%s)" % control.hostname)
self.process = process
self.control = control
# block_name -> BlockData
self._block_data = {}
# block_name -> {field_name: Part}
self._parts = OrderedDict()
# src_attr -> [dest_attr]
self._listening_attrs = {}
# (block_name, src_field_name) -> [dest_field_name]
self._scale_offset_fields = {}
# full_src_field -> [full_dest_field]
self._mirrored_fields = {}
# changes left over from last time
self.changes = OrderedDict()
# fields that need to inherit UNITS, SCALE and OFFSET from upstream
self._inherit_scale = {}
self._inherit_offset = {}
self.q = process.create_queue()
self.add_spawn_function(self.poll_loop,
self.make_default_stop_func(self.q))
class StateMachine(Loggable):
RESETTING = "Resetting"
DISABLED = "Disabled"
DISABLING = "Disabling"
FAULT = "Fault"
# Subclasses must override this
AFTER_RESETTING = None
def __init__(self):
self.set_logger_name(type(self).__name__)
self.allowed_transitions = OrderedDict()
self.busy_states = []
assert self.AFTER_RESETTING is not None, \
"No AFTER_RESETTING state given"
self.set_allowed(self.RESETTING, self.AFTER_RESETTING)
self.set_busy(self.RESETTING)
self.create_states()
custom_states = list(self.allowed_transitions) + [self.AFTER_RESETTING]
# Set transitions for standard states
for state in custom_states:
self.set_allowed(state, self.FAULT)
self.set_allowed(state, self.DISABLING)
self.set_allowed(self.FAULT, [self.RESETTING, self.DISABLING])
self.set_allowed(self.DISABLING, [self.FAULT, self.DISABLED])
self.set_allowed(self.DISABLED, self.RESETTING)
# These are all the states we can possibly be in
self.possible_states = list(self.allowed_transitions)
def create_states(self):
raise NotImplementedError()
def is_allowed(self, initial_state, target_state):
"""
Check if a transition between two states is allowed
Args:
initial_state(str): Initial state
target_state(str): Target state
Returns:
bool: True if allowed, False if not
"""
assert initial_state in self.allowed_transitions, \
"%s is not in %s" % (initial_state, list(self.allowed_transitions))
return target_state in self.allowed_transitions[initial_state]
def set_allowed(self, initial_state, allowed_states):
"""
Add an allowed transition state
Args:
initial_state(str): Initial state
allowed_states(list(str) / str): States that initial_state can
transition to
"""
if not isinstance(allowed_states, list):
allowed_states = [allowed_states]
self.allowed_transitions.setdefault(initial_state, set()).update(
allowed_states)
def set_busy(self, state, busy=True):
"""
Set the busy-ness of a state; i.e. whether the block is considered
to be busy in a certain state
Args:
state(str): State to update
busy(bool): True or False for whether state is a busy state
"""
if not busy and state in self.busy_states:
self.busy_states.remove(state)
elif busy and state not in self.busy_states:
self.busy_states.append(state)
def is_busy(self, state):
"""
Check if a state is a busy state
Args:
state(str): State to check busy-ness for
Returns:
bool: True if state is a busy state, False if not
"""
return state in self.busy_states
def set_parameters(self, parameters):
if parameters is not None:
parameters = OrderedDict(
(deserialize_object(k, str_), serialize_object(v))
for k, v in parameters.items())
self.set_endpoint_data("parameters", parameters)
class PandABoxPoller(Spawnable, Loggable):
def __init__(self, process, control):
self.set_logger_name("PandABoxPoller(%s)" % control.hostname)
self.process = process
self.control = control
# block_name -> BlockData
self._block_data = {}
# block_name -> {field_name: Part}
self._parts = OrderedDict()
# src_attr -> [dest_attr]
self._listening_attrs = {}
# (block_name, src_field_name) -> [dest_field_name]
self._scale_offset_fields = {}
# full_src_field -> [full_dest_field]
self._mirrored_fields = {}
# changes left over from last time
self.changes = OrderedDict()
# fields that need to inherit UNITS, SCALE and OFFSET from upstream
self._inherit_scale = {}
self._inherit_offset = {}
self.q = process.create_queue()
self.add_spawn_function(self.poll_loop,
self.make_default_stop_func(self.q))
def make_panda_block(self, mri, block_name, block_data, parts=None,
area_detector=False):
# Validate and store block_data
self._store_block_data(block_name, block_data)
# Defer creation of parts to a block maker
maker = PandABoxBlockMaker(self.process, self.control, block_name,
block_data, area_detector)
# Add in any extras we are passed
if parts:
for part in parts:
maker.parts[part.name] = part
# Make a controller
params = DefaultController.MethodMeta.prepare_input_map(mri=mri)
controller = DefaultController(
self.process, maker.parts.values(), params)
block = controller.block
self._parts[block_name] = maker.parts
# Set the initial block_url
self._set_icon_url(block_name)
return block
def _set_icon_url(self, block_name):
icon_attr = self._parts[block_name]["icon"].attr
fname = block_name.rstrip("0123456789")
if fname == "LUT":
# TODO: Get fname from func
pass
# TODO: make relative
url = "http://localhost:8080/path/to/%s" % fname
icon_attr.set_value(url)
def _store_block_data(self, block_name, block_data):
self._block_data[block_name] = block_data
# setup param pos on a block with pos_out to inherit SCALE OFFSET UNITS
pos_fields = []
pos_out_fields = []
pos_mux_inp_fields = []
for field_name, field_data in block_data.fields.items():
if field_name == "INP" and field_data.field_type == "pos_mux":
pos_mux_inp_fields.append(field_name)
elif field_data.field_type == "pos_out":
pos_out_fields.append(field_name)
elif field_data.field_subtype in ("pos", "relative_pos"):
pos_fields.append(field_name)
# Make sure pos_fields can get SCALE from somewhere
if pos_fields:
sources = pos_mux_inp_fields + pos_out_fields
assert len(sources) == 1, \
"Expected one source of SCALE and OFFSET for %s, got %s" % (
pos_fields, sources)
for field_name in pos_fields:
self._map_scale_offset(block_name, sources[0], field_name)
def _map_scale_offset(self, block_name, src_field, dest_field):
self._scale_offset_fields.setdefault(
(block_name, src_field), []).append(dest_field)
if src_field == "INP":
# mapping based on what it is connected to, defer
return
for suff in ("SCALE", "OFFSET", "UNITS"):
full_src_field = "%s.%s.%s" % (block_name, src_field, suff)
full_dest_field = "%s.%s.%s" % (block_name, dest_field, suff)
self._mirrored_fields.setdefault(full_src_field, []).append(
full_dest_field)
def poll_loop(self):
"""At 10Hz poll for changes"""
next_poll = time.time()
while True:
next_poll += 0.1
timeout = next_poll - time.time()
if timeout < 0:
timeout = 0
try:
message = self.q.get(timeout=timeout)
if message is Spawnable.STOP:
break
except queue.Empty:
# No problem
pass
try:
self.handle_changes(self.control.get_changes())
except Exception:
self.log_exception("Error while getting changes")
def handle_changes(self, changes):
for k, v in changes.items():
self.changes[k] = v
for full_field, val in list(self.changes.items()):
# If we have a mirrored field then fire off a request
for dest_field in self._mirrored_fields.get(full_field, []):
self.control.send("%s=%s\n" % (dest_field, val))
block_name, field_name = full_field.split(".", 1)
ret = self.update_attribute(block_name, field_name, val)
if ret is not None:
self.changes[full_field] = ret
else:
self.changes.pop(full_field)
# If it was LUT.FUNC then recalculate icon
if block_name.startswith("LUT") and field_name == "FUNC":
self._set_icon_url(block_name)
def update_attribute(self, block_name, field_name, val):
ret = None
if block_name not in self._parts:
self.log_debug("Block %s not known", block_name)
return
parts = self._parts[block_name]
if field_name not in parts:
self.log_debug("Block %s has no field %s", block_name,
field_name)
return
part = parts[field_name]
attr = part.attr
field_data = self._block_data[block_name].fields.get(field_name, None)
if val == Exception:
# TODO: set error
val = None
elif isinstance(attr.meta, BooleanMeta):
val = bool(int(val))
is_bit_out = field_data and field_data.field_type == "bit_out"
if is_bit_out and val == attr.value:
# make bit_out things toggle while changing
ret = val
val = not val
elif isinstance(attr.meta, TableMeta):
val = part.table_from_list(val)
# Update the value of our attribute and anyone listening
attr.set_value(val)
for dest_attr in self._listening_attrs.get(attr, []):
dest_attr.set_value(val)
# if we changed the value of a mux, update the slaved values
if field_data and field_data.field_type in ("bit_mux", "pos_mux"):
val_part = parts[field_name + ".VAL"]
val_attr = val_part.attr
self._update_val_attr(val_attr, val)
if field_data.field_type == "pos_mux" and field_name == "INP":
# all param pos fields should inherit scale and offset
for dest_field_name in self._scale_offset_fields.get(
(block_name, field_name), []):
self._update_scale_offset_mapping(
block_name, dest_field_name, val)
return ret
def _update_scale_offset_mapping(self, block_name, field_name, mux_val):
# Find the fields that depend on this input
field_data = self._block_data[block_name].fields.get(field_name, None)
if field_data.field_subtype == "relative_pos":
suffs = ("SCALE", "UNITS")
else:
suffs = ("SCALE", "OFFSET", "UNITS")
for suff in suffs:
full_src_field = "%s.%s" % (mux_val, suff)
full_dest_field = "%s.%s.%s" % (block_name, field_name, suff)
# Remove mirrored fields that are already in lists
for field_list in self._mirrored_fields.values():
try:
field_list.remove(full_dest_field)
except ValueError:
pass
self._mirrored_fields.setdefault(full_src_field, []).append(
full_dest_field)
# update it to the right value
if mux_val == "ZERO":
value = dict(SCALE=1, OFFSET=0, UNITS="")[suff]
else:
mon_block_name, mon_field_name = mux_val.split(".", 1)
mon_parts = self._parts[mon_block_name]
src_attr = mon_parts["%s.%s" % (mon_field_name, suff)].attr
value = src_attr.value
self.control.send("%s=%s\n" % (full_dest_field, value))
def _update_val_attr(self, val_attr, mux_val):
# Remove the old val_attr from all lists
for mux_list in self._listening_attrs.values():
try:
mux_list.remove(val_attr)
except ValueError:
pass
# add it to the list of things that need to update
if mux_val == "ZERO":
val_attr.set_value(0)
elif mux_val == "ONE":
val_attr.set_value(1)
else:
mon_block_name, mon_field_name = mux_val.split(".", 1)
mon_parts = self._parts[mon_block_name]
out_attr = mon_parts[mon_field_name].attr
self._listening_attrs.setdefault(out_attr, []).append(val_attr)
# update it to the right value
val_attr.set_value(out_attr.value)
class Process(Loggable):
"""Hosts a number of Blocks, distributing requests between them"""
def __init__(self, name, sync_factory):
self.set_logger_name(name)
self.name = name
self.sync_factory = sync_factory
self.q = self.create_queue()
self._blocks = OrderedDict() # block_name -> Block
self._controllers = OrderedDict() # block_name -> Controller
self._block_state_cache = Cache()
self._recv_spawned = None
self._other_spawned = []
# lookup of all Subscribe requests, ordered to guarantee subscription
# notification ordering
# {Request.generate_key(): Subscribe}
self._subscriptions = OrderedDict()
self.comms = []
self._client_comms = OrderedDict() # client comms -> list of blocks
self._handle_functions = {
Post: self._forward_block_request,
Put: self._forward_block_request,
Get: self._handle_get,
Subscribe: self._handle_subscribe,
Unsubscribe: self._handle_unsubscribe,
BlockChanges: self._handle_block_changes,
BlockRespond: self._handle_block_respond,
BlockAdd: self._handle_block_add,
BlockList: self._handle_block_list,
AddSpawned: self._add_spawned,
}
self.create_process_block()
def recv_loop(self):
"""Service self.q, distributing the requests to the right block"""
while True:
request = self.q.get()
self.log_debug("Received request %s", request)
if request is PROCESS_STOP:
# Got the sentinel, stop immediately
break
try:
self._handle_functions[type(request)](request)
except Exception as e: # pylint:disable=broad-except
self.log_exception("Exception while handling %s", request)
try:
request.respond_with_error(str(e))
except Exception:
pass
def add_comms(self, comms):
assert not self._recv_spawned, \
"Can't add comms when process has been started"
self.comms.append(comms)
def start(self):
"""Start the process going"""
self._recv_spawned = self.sync_factory.spawn(self.recv_loop)
for comms in self.comms:
comms.start()
def stop(self, timeout=None):
"""Stop the process and wait for it to finish
Args:
timeout (float): Maximum amount of time to wait for each spawned
process. None means forever
"""
assert self._recv_spawned, "Process not started"
self.q.put(PROCESS_STOP)
for comms in self.comms:
comms.stop()
# Wait for recv_loop to complete first
self._recv_spawned.wait(timeout=timeout)
# Now wait for anything it spawned to complete
for s, _ in self._other_spawned:
s.wait(timeout=timeout)
# Garbage collect the syncfactory
del self.sync_factory
def _forward_block_request(self, request):
"""Lookup target Block and spawn block.handle_request(request)
Args:
request (Request): The message that should be passed to the Block
"""
block_name = request.endpoint[0]
block = self._blocks[block_name]
spawned = self.sync_factory.spawn(block.handle_request, request)
self._add_spawned(AddSpawned(spawned, block.handle_request))
def create_queue(self):
"""
Create a queue using sync_factory object
Returns:
Queue: New queue
"""
return self.sync_factory.create_queue()
def create_lock(self):
"""
Create a lock using sync_factory object
Returns:
New lock object
"""
return self.sync_factory.create_lock()
def spawn(self, function, *args, **kwargs):
"""Calls SyncFactory.spawn()"""
def catching_function():
try:
function(*args, **kwargs)
except Exception:
self.log_exception(
"Exception calling %s(*%s, **%s)", function, args, kwargs)
raise
spawned = self.sync_factory.spawn(catching_function)
request = AddSpawned(spawned, function)
self.q.put(request)
return spawned
def _add_spawned(self, request):
spawned = self._other_spawned
self._other_spawned = []
spawned.append((request.spawned, request.function))
# Filter out the spawned that have completed to stop memory leaks
for sp, f in spawned:
if not sp.ready():
self._other_spawned.append((sp, f))
def get_client_comms(self, block_name):
for client_comms, blocks in list(self._client_comms.items()):
if block_name in blocks:
return client_comms
def create_process_block(self):
self.process_block = Block()
# TODO: add a meta here
children = OrderedDict()
children["blocks"] = StringArrayMeta(
description="Blocks hosted by this Process"
).make_attribute([])
children["remoteBlocks"] = StringArrayMeta(
description="Blocks reachable via ClientComms"
).make_attribute([])
self.process_block.replace_endpoints(children)
self.process_block.set_process_path(self, [self.name])
self.add_block(self.process_block, self)
def update_block_list(self, client_comms, blocks):
self.q.put(BlockList(client_comms=client_comms, blocks=blocks))
def _handle_block_list(self, request):
self._client_comms[request.client_comms] = request.blocks
remotes = []
for blocks in self._client_comms.values():
remotes += [b for b in blocks if b not in remotes]
self.process_block["remoteBlocks"].set_value(remotes)
def _handle_block_changes(self, request):
"""Update subscribers with changes and applies stored changes to the
cached structure"""
# update cached dict
subscription_changes = self._block_state_cache.apply_changes(
*request.changes)
# Send out the changes
for subscription, changes in subscription_changes.items():
if subscription.delta:
# respond with the filtered changes
subscription.respond_with_delta(changes)
else:
# respond with the structure of everything
# below the endpoint
d = self._block_state_cache.walk_path(subscription.endpoint)
subscription.respond_with_update(d)
def report_changes(self, *changes):
self.q.put(BlockChanges(changes=list(changes)))
def block_respond(self, response, response_queue):
self.q.put(BlockRespond(response, response_queue))
def _handle_block_respond(self, request):
"""Push the response to the required queue"""
request.response_queue.put(request.response)
def add_block(self, block, controller):
"""Add a block to be hosted by this process
Args:
block (Block): The block to be added
controller (Controller): Its controller
"""
path = block.process_path
assert len(path) == 1, \
"Expected block %r to have %r as parent, got path %r" % \
(block, self, path)
name = path[0]
assert name not in self._blocks, \
"There is already a block called %r" % name
request = BlockAdd(block=block, controller=controller, name=name)
if self._recv_spawned:
# Started, so call in Process thread
self.q.put(request)
else:
# Not started yet so we are safe to add in this thread
self._handle_block_add(request)
def _handle_block_add(self, request):
"""Add a block to be hosted by this process"""
assert request.name not in self._blocks, \
"There is already a block called %r" % request.name
self._blocks[request.name] = request.block
self._controllers[request.name] = request.controller
serialized = request.block.to_dict()
change_request = BlockChanges([[[request.name], serialized]])
self._handle_block_changes(change_request)
# Regenerate list of blocks
self.process_block["blocks"].set_value(list(self._blocks))
def get_block(self, block_name):
try:
return self._blocks[block_name]
except KeyError:
if block_name in self.process_block.remoteBlocks:
return self.make_client_block(block_name)
else:
raise
def make_client_block(self, block_name):
params = ClientController.MethodMeta.prepare_input_map(
mri=block_name)
controller = ClientController(self, {}, params)
return controller.block
def get_controller(self, block_name):
return self._controllers[block_name]
def _handle_subscribe(self, request):
"""Add a new subscriber and respond with the current
sub-structure state"""
key = request.generate_key()
assert key not in self._subscriptions, \
"Subscription on %s already exists" % (key,)
self._subscriptions[key] = request
self._block_state_cache.add_subscriber(request, request.endpoint)
d = self._block_state_cache.walk_path(request.endpoint)
self.log_debug("Initial subscription value %s", d)
if request.delta:
request.respond_with_delta([[[], d]])
else:
request.respond_with_update(d)
def _handle_unsubscribe(self, request):
"""Remove a subscriber and respond with success or error"""
key = request.generate_key()
try:
subscription = self._subscriptions.pop(key)
except KeyError:
request.respond_with_error(
"No subscription found for %s" % (key,))
else:
self._block_state_cache.remove_subscriber(
subscription, subscription.endpoint)
request.respond_with_return()
def _handle_get(self, request):
d = self._block_state_cache.walk_path(request.endpoint)
request.respond_with_return(d)
class PandABoxTablePart(PandABoxFieldPart):
"""This will normally be instantiated by the PandABox assembly, not created
in yaml"""
def __init__(self, process, control, meta, block_name, field_name,
writeable):
super(PandABoxTablePart, self).__init__(
process, control, meta, block_name, field_name, writeable)
# Fill in the meta object with the correct headers
columns = OrderedDict()
self.fields = OrderedDict()
fields = control.get_table_fields(block_name, field_name)
for field_name, (bits_hi, bits_lo) in fields.items():
nbits = bits_hi - bits_lo + 1
if nbits < 1:
raise ValueError("Bad bits %s:%s" % (bits_hi, bits_lo))
if nbits == 1:
column_meta = BooleanArrayMeta(field_name)
widget_tag = widget("checkbox")
else:
if nbits <= 8:
dtype = "uint8"
elif nbits <= 16:
dtype = "uint16"
elif nbits <= 32:
dtype = "uint32"
elif nbits <= 64:
dtype = "uint64"
else:
raise ValueError("Bad bits %s:%s" % (bits_hi, bits_lo))
column_meta = NumberArrayMeta(dtype, field_name)
widget_tag = widget("textinput")
label, column_name = make_label_attr_name(field_name)
column_meta.set_label(label)
column_meta.set_tags([widget_tag])
columns[column_name] = column_meta
self.fields[column_name] = (bits_hi, bits_lo)
meta.set_elements(TableElementMap(columns))
def set_field(self, value):
int_values = self.list_from_table(value)
self.control.set_table(self.block_name, self.field_name, int_values)
def _calc_nconsume(self):
max_bits_hi = max(self.fields.values())[0]
nconsume = int((max_bits_hi + 31) / 32)
return nconsume
def list_from_table(self, table):
int_values = []
if self.fields:
nconsume = self._calc_nconsume()
for row in range(len(table[list(self.fields)[0]])):
int_value = 0
for name, (bits_hi, bits_lo) in self.fields.items():
max_value = 2 ** (bits_hi - bits_lo + 1)
field_value = int(table[name][row])
assert field_value < max_value, \
"Expected %s[%d] < %s, got %s" % (
name, row, max_value, field_value)
int_value |= field_value << bits_lo
# Split the big int into 32-bit numbers
for i in range(nconsume):
int_values.append(int_value & (2 ** 32 - 1))
int_value = int_value >> 32
return int_values
def table_from_list(self, int_values):
table = Table(self.meta)
if self.fields:
nconsume = self._calc_nconsume()
for i in range(int(len(int_values) / nconsume)):
int_value = 0
for c in range(nconsume):
int_value += int(int_values[i*nconsume+c]) << (32 * c)
row = []
for name, (bits_hi, bits_lo) in self.fields.items():
mask = 2 ** (bits_hi + 1) - 1
field_value = (int_value & mask) >> bits_lo
row.append(field_value)
table.append(row)
return table