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action.py
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"""High-level Action base class implementation."""
import
asyncio
import
uuid
from
copy
import
deepcopy
from
.
utils
import
timestamp
class
ActionObject
:
"""An ActionObject represents an individual action on a thing."""
def
__init__
(
self
,
thing
,
name
,
target
,
input_
):
"""
Initialize the object.
id_ ID of this action
thing -- the Thing this action belongs to
name -- name of the action
input_ -- any action inputs
"""
self
.
_task
=
None
self
.
id
=
uuid
.
uuid4
().
hex
self
.
thing
=
thing
self
.
name
=
name
self
.
target_function
=
target
self
.
input
=
input_
self
.
output
=
None
self
.
href_prefix
=
""
self
.
href
=
"/actions/{}/{}"
.
format
(
self
.
name
,
self
.
id
)
self
.
status
=
"pending"
self
.
time_requested
=
timestamp
()
self
.
time_completed
=
None
def
as_action_description
(
self
):
"""
Get the action description.
Returns a dictionary describing the action.
"""
description
=
{
"name"
:
self
.
name
,
"id"
:
self
.
id
,
"href"
:
self
.
href_prefix
+
self
.
href
,
"timeRequested"
:
self
.
time_requested
,
"timeCompleted"
:
self
.
time_completed
,
"status"
:
self
.
status
,
}
if
self
.
input
is
not
None
:
description
[
"input"
]
=
self
.
input
if
self
.
output
is
not
None
:
description
[
"output"
]
=
self
.
output
return
description
def
set_href_prefix
(
self
,
prefix
):
"""
Set the prefix of any hrefs associated with this action.
prefix -- the prefix
"""
self
.
href_prefix
=
prefix
def
get_id
(
self
):
"""Get this action's ID."""
return
self
.
id
def
get_name
(
self
):
"""Get this action's name."""
return
self
.
name
def
get_href
(
self
):
"""Get this action's href."""
return
self
.
href_prefix
+
self
.
href
def
get_status
(
self
):
"""Get this action's status."""
return
self
.
status
def
get_thing
(
self
):
"""Get the thing associated with this action."""
return
self
.
thing
def
get_time_requested
(
self
):
"""Get the time the action was requested."""
return
self
.
time_requested
def
get_time_completed
(
self
):
"""Get the time the action was completed."""
return
self
.
time_completed
def
get_input
(
self
):
"""Get the inputs for this action."""
return
self
.
input
async
def
start
(
self
):
"""Start performing the action."""
self
.
status
=
"running"
self
.
thing
.
action_notify
(
self
)
# If the action function is async
if
asyncio
.
iscoroutinefunction
(
self
.
target_function
):
self
.
_task
=
asyncio
.
ensure_future
(
self
.
target_function
(
self
.
input
))
# If the action function is not async
else
:
# Run in the default ThreadPoolExecutor
self
.
_task
=
asyncio
.
get_event_loop
().
run_in_executor
(
None
,
self
.
target_function
,
self
.
input
)
self
.
_task
.
add_done_callback
(
self
.
finish
)
def
cancel
(
self
):
if
self
.
_task
:
self
.
_task
.
cancel
()
def
finish
(
self
,
future
):
"""Finish performing the action."""
try
:
self
.
output
=
future
.
result
()
self
.
status
=
"completed"
except
asyncio
.
CancelledError
:
self
.
status
=
"cancelled"
except
Exception
as
e
:
self
.
output
=
str
(
e
)
self
.
status
=
"error"
self
.
time_completed
=
timestamp
()
self
.
thing
.
action_notify
(
self
)
class
Action
:
"""An Action represents a class of actions on a thing."""
def
__init__
(
self
,
thing
,
name
,
invokeaction
=
None
,
metadata
=
None
,
input_
=
None
,
output
=
None
):
self
.
thing
=
thing
self
.
name
=
name
self
.
href_prefix
=
""
self
.
href
=
"/actions/{}"
.
format
(
self
.
name
)
self
.
metadata
=
metadata
if
metadata
is
not
None
else
{}
self
.
input
=
input_
if
input_
is
not
None
else
{}
self
.
output
=
output
if
output
is
not
None
else
{}
self
.
invokeaction_forwarder
=
invokeaction
or
(
lambda
:
None
)
self
.
queue
=
[]
def
as_action_description
(
self
):
"""
Get the action description.
Returns a dictionary describing the action.
"""
description
=
deepcopy
(
self
.
metadata
)
# Create WoT TD v1 input and output keys
if
"input"
not
in
description
:
description
[
"input"
]
=
self
.
input
if
"output"
not
in
description
:
description
[
"output"
]
=
{
"type"
:
"object"
,
"properties"
: {
"name"
: {
"type"
:
"string"
},
"id"
: {
"type"
:
"string"
},
"href"
: {
"type"
:
"string"
,
"format"
:
"uri"
},
"timeRequested"
: {
"type"
:
"string"
,
"format"
:
"date-time"
},
"timeCompleted"
: {
"type"
:
"string"
,
"format"
:
"date-time"
},
"status"
: {
"type"
:
"string"
,
"enum"
: [
"pending"
,
"running"
,
"completed"
,
"cancelled"
,
"error"
,
],
},
**
({
"output"
:
self
.
output
}
if
self
.
output
else
{}),
**
({
"input"
:
self
.
input
}
if
self
.
input
else
{}),
},
}
# Create forms
if
"forms"
not
in
description
:
description
[
"forms"
]
=
[]
description
[
"forms"
].
append
(
{
"op"
:
"invokeaction"
,
"href"
:
self
.
href_prefix
+
self
.
href
,
"htv:methodName"
:
"POST"
,
}
)
return
description
def
invokeaction
(
self
,
input_
):
action_obj
=
ActionObject
(
self
.
thing
,
self
.
name
,
self
.
invokeaction_forwarder
,
input_
)
self
.
queue
.
append
(
action_obj
)
return
action_obj
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