130 lines
4.1 KiB
Python
130 lines
4.1 KiB
Python
from labthings.server.extensions import BaseExtension
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from labthings.server.find import find_component
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from labthings.server.view import View, ActionView, PropertyView
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from labthings.server.decorators import (
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use_args,
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marshal_with,
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ThingProperty,
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PropertySchema,
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ThingAction,
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doc_response,
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)
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from labthings.server.schema import Schema
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from labthings.server import fields
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from flask import send_file # Used to send images from our server
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import io # Used in our capture action
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## Extension methods
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# Define which properties of a Microscope object we care about,
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# and what types they should be converted to
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class MicroscopeIdentifySchema(Schema):
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name = fields.String() # Microscopes name
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id = fields.UUID() # Microscopes unique ID
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state = fields.Dict() # Status dictionary
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camera = fields.String() # Camera object (represented as a string)
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stage = fields.String() # Stage object (represented as a string)
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def rename(microscope, new_name):
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"""
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Rename the microscope
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"""
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microscope.name = new_name
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microscope.save_settings()
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## Extension views
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# Since we only have a GET method here, it'll register as a read-only property
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class ExampleIdentifyView(PropertyView):
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# Format our returned object using MicroscopeIdentifySchema
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@marshal_with(MicroscopeIdentifySchema())
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def get(self):
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"""
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Show identifying information about the current microscope object
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"""
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# Find our microscope component
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microscope = find_component("org.openflexure.microscope")
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# Return our microscope object,
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# let @marshal_with handle formatting the output
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return microscope
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# We can use a single schema for all methods if the input and output will be formatted identically
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# Eg. Here, we will always expect a "name" string argument, and always return a "name" string attribute
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@PropertySchema({"name": fields.String(required=True, example="My Example Microscope")})
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class ExampleRenameView(PropertyView):
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def get(self):
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"""
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Show the current microscope name
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"""
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# Find our microscope component
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microscope = find_component("org.openflexure.microscope")
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return microscope
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def post(self, args):
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"""
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Change the current microscope name
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"""
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# Look for our "name" parameter in the request arguments
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new_name = args.get("name")
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# Find our microscope component
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microscope = find_component("org.openflexure.microscope")
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# Pass microscope and new name to our rename function
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rename(microscope, new_name)
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# Return our microscope object,
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# let @marshal_with handle formatting the output
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return microscope
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class QuickCaptureAPI(ActionView):
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"""
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Take an image capture and return it without saving
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"""
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# Expect a "use_video_port" boolean, which defaults to True if none is given
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@use_args({"use_video_port": fields.Boolean(missing=True)})
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# Our success response (200) returns an image (image/jpeg mimetype)
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@doc_response(200, mimetype="image/jpeg")
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def post(self, args):
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"""
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Take a non-persistant image capture.
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"""
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# Find our microscope component
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microscope = find_component("org.openflexure.microscope")
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# Open a BytesIO stream to be destroyed once request has returned
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with io.BytesIO() as stream:
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# Capture to our stream object
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microscope.camera.capture(stream, use_video_port=args.get("use_video_port"))
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# Rewind the stream
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stream.seek(0)
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# Return our image data using Flasks send_file function
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return send_file(io.BytesIO(stream.read()), mimetype="image/jpeg")
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## Create extension
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# Create your extension object
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my_extension = BaseExtension("com.myname.myextension", version="0.0.0")
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# Add methods to your extension
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my_extension.add_method(rename, "rename")
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# Add API views to your extension
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my_extension.add_view(ExampleIdentifyView, "/identify")
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my_extension.add_view(ExampleRenameView, "/rename")
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my_extension.add_view(QuickCaptureAPI, "/quick-capture")
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