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Improve async setup code

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This commit is contained in:
mDuo13
2022-01-31 13:40:18 -08:00
parent 9490cab4eb
commit 222a7760d1
6 changed files with 34 additions and 32 deletions
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12
content/_code-samples/build-a-wallet/py/2_threaded.py
View File

@@ -14,13 +14,15 @@ class XRPLMonitorThread(Thread):
the main frame to be shown in the UI. Using a thread lets us maintain the
responsiveness of the UI while doing work in the background.
"""
def __init__(self, url, gui, loop):
def __init__(self, url, gui):
Thread.__init__(self, daemon=True)
# Note: For thread safety, this thread should treat self.gui as
# read-only; to modify the GUI, use wx.CallAfter(...)
self.gui = gui
self.url = url
self.loop = loop
self.loop = asyncio.new_event_loop()
asyncio.set_event_loop(self.loop)
self.loop.set_debug(True)
def run(self):
"""
@@ -28,7 +30,6 @@ class XRPLMonitorThread(Thread):
from the XRPL, sending them to the GUI thread when necessary, and also
handles making requests to the XRPL when the GUI prompts them.
"""
asyncio.set_event_loop(self.loop)
self.loop.run_forever()
async def watch_xrpl(self):
@@ -71,8 +72,7 @@ class TWaXLFrame(wx.Frame):
self.build_ui()
# Start background thread for updates from the ledger ------------------
self.worker_loop = asyncio.new_event_loop()
self.worker = XRPLMonitorThread(url, self, self.worker_loop)
self.worker = XRPLMonitorThread(url, self)
self.worker.start()
self.run_bg_job(self.worker.watch_xrpl())
@@ -92,7 +92,7 @@ class TWaXLFrame(wx.Frame):
Schedules a job to run asynchronously in the XRPL worker thread.
The job should be a Future (for example, from calling an async function)
"""
task = asyncio.run_coroutine_threadsafe(job, self.worker_loop)
task = asyncio.run_coroutine_threadsafe(job, self.worker.loop)
def update_ledger(self, message):
"""

12
content/_code-samples/build-a-wallet/py/3_account.py
View File

@@ -15,13 +15,15 @@ class XRPLMonitorThread(Thread):
the main frame to be shown in the UI. Using a thread lets us maintain the
responsiveness of the UI while doing work in the background.
"""
def __init__(self, url, gui, loop):
def __init__(self, url, gui):
Thread.__init__(self, daemon=True)
# Note: For thread safety, this thread should treat self.gui as
# read-only; to modify the GUI, use wx.CallAfter(...)
self.gui = gui
self.url = url
self.loop = loop
self.loop = asyncio.new_event_loop()
asyncio.set_event_loop(self.loop)
self.loop.set_debug(True)
def run(self):
"""
@@ -29,7 +31,6 @@ class XRPLMonitorThread(Thread):
from the XRPL, sending them to the GUI thread when necessary, and also
handles making requests to the XRPL when the GUI prompts them.
"""
asyncio.set_event_loop(self.loop)
self.loop.run_forever()
async def watch_xrpl_account(self, address, wallet=None):
@@ -126,8 +127,7 @@ class TWaXLFrame(wx.Frame):
self.classic_address = address
# Start background thread for updates from the ledger ------------------
self.worker_loop = asyncio.new_event_loop()
self.worker = XRPLMonitorThread(url, self, self.worker_loop)
self.worker = XRPLMonitorThread(url, self)
self.worker.start()
self.run_bg_job(self.worker.watch_xrpl_account(address, wallet))
@@ -166,7 +166,7 @@ class TWaXLFrame(wx.Frame):
Schedules a job to run asynchronously in the XRPL worker thread.
The job should be a Future (for example, from calling an async function)
"""
task = asyncio.run_coroutine_threadsafe(job, self.worker_loop)
task = asyncio.run_coroutine_threadsafe(job, self.worker.loop)
def toggle_dialog_style(self, event):
"""

12
content/_code-samples/build-a-wallet/py/4_tx_history.py
View File

@@ -18,13 +18,15 @@ class XRPLMonitorThread(Thread):
the main frame to be shown in the UI. Using a thread lets us maintain the
responsiveness of the UI while doing work in the background.
"""
def __init__(self, url, gui, loop):
def __init__(self, url, gui):
Thread.__init__(self, daemon=True)
# Note: For thread safety, this thread should treat self.gui as
# read-only; to modify the GUI, use wx.CallAfter(...)
self.gui = gui
self.url = url
self.loop = loop
self.loop = asyncio.new_event_loop()
asyncio.set_event_loop(self.loop)
self.loop.set_debug(True)
def run(self):
"""
@@ -32,7 +34,6 @@ class XRPLMonitorThread(Thread):
from the XRPL, sending them to the GUI thread when necessary, and also
handles making requests to the XRPL when the GUI prompts them.
"""
asyncio.set_event_loop(self.loop)
self.loop.run_forever()
async def watch_xrpl_account(self, address, wallet=None):
@@ -137,8 +138,7 @@ class TWaXLFrame(wx.Frame):
self.classic_address = address
# Start background thread for updates from the ledger ------------------
self.worker_loop = asyncio.new_event_loop()
self.worker = XRPLMonitorThread(url, self, self.worker_loop)
self.worker = XRPLMonitorThread(url, self)
self.worker.start()
self.run_bg_job(self.worker.watch_xrpl_account(address, wallet))
@@ -197,7 +197,7 @@ class TWaXLFrame(wx.Frame):
Schedules a job to run asynchronously in the XRPL worker thread.
The job should be a Future (for example, from calling an async function)
"""
task = asyncio.run_coroutine_threadsafe(job, self.worker_loop)
task = asyncio.run_coroutine_threadsafe(job, self.worker.loop)
def toggle_dialog_style(self, event):
"""

12
content/_code-samples/build-a-wallet/py/5_send_xrp.py
View File

@@ -18,13 +18,15 @@ class XRPLMonitorThread(Thread):
the main frame to be shown in the UI. Using a thread lets us maintain the
responsiveness of the UI while doing work in the background.
"""
def __init__(self, url, gui, loop):
def __init__(self, url, gui):
Thread.__init__(self, daemon=True)
# Note: For thread safety, this thread should treat self.gui as
# read-only; to modify the GUI, use wx.CallAfter(...)
self.gui = gui
self.url = url
self.loop = loop
self.loop = asyncio.new_event_loop()
asyncio.set_event_loop(self.loop)
self.loop.set_debug(True)
def run(self):
"""
@@ -32,7 +34,6 @@ class XRPLMonitorThread(Thread):
from the XRPL, sending them to the GUI thread when necessary, and also
handles making requests to the XRPL when the GUI prompts them.
"""
asyncio.set_event_loop(self.loop)
self.loop.run_forever()
async def watch_xrpl_account(self, address, wallet=None):
@@ -246,8 +247,7 @@ class TWaXLFrame(wx.Frame):
self.classic_address = address
# Start background thread for updates from the ledger ------------------
self.worker_loop = asyncio.new_event_loop()
self.worker = XRPLMonitorThread(url, self, self.worker_loop)
self.worker = XRPLMonitorThread(url, self)
self.worker.start()
self.run_bg_job(self.worker.watch_xrpl_account(address, wallet))
@@ -315,7 +315,7 @@ class TWaXLFrame(wx.Frame):
Schedules a job to run asynchronously in the XRPL worker thread.
The job should be a Future (for example, from calling an async function)
"""
task = asyncio.run_coroutine_threadsafe(job, self.worker_loop)
task = asyncio.run_coroutine_threadsafe(job, self.worker.loop)
def toggle_dialog_style(self, event):
"""

12
content/_code-samples/build-a-wallet/py/6_verification_and_polish.py
View File

@@ -20,13 +20,15 @@ class XRPLMonitorThread(Thread):
the main frame to be shown in the UI. Using a thread lets us maintain the
responsiveness of the UI while doing work in the background.
"""
def __init__(self, url, gui, loop):
def __init__(self, url, gui):
Thread.__init__(self, daemon=True)
# Note: For thread safety, this thread should treat self.gui as
# read-only; to modify the GUI, use wx.CallAfter(...)
self.gui = gui
self.url = url
self.loop = loop
self.loop = asyncio.new_event_loop()
asyncio.set_event_loop(self.loop)
self.loop.set_debug(True)
def run(self):
"""
@@ -34,7 +36,6 @@ class XRPLMonitorThread(Thread):
from the XRPL, sending them to the GUI thread when necessary, and also
handles making requests to the XRPL when the GUI prompts them.
"""
asyncio.set_event_loop(self.loop)
self.loop.run_forever()
async def watch_xrpl_account(self, address, wallet=None):
@@ -400,8 +401,7 @@ class TWaXLFrame(wx.Frame):
self.classic_address = address
# Start background thread for updates from the ledger ------------------
self.worker_loop = asyncio.new_event_loop()
self.worker = XRPLMonitorThread(url, self, self.worker_loop)
self.worker = XRPLMonitorThread(url, self)
self.worker.start()
self.run_bg_job(self.worker.watch_xrpl_account(address, wallet))
@@ -469,7 +469,7 @@ class TWaXLFrame(wx.Frame):
Schedules a job to run asynchronously in the XRPL worker thread.
The job should be a Future (for example, from calling an async function)
"""
task = asyncio.run_coroutine_threadsafe(job, self.worker_loop)
task = asyncio.run_coroutine_threadsafe(job, self.worker.loop)
def toggle_dialog_style(self, event):
"""

6
content/tutorials/build-apps/build-a-desktop-wallet-in-python.md
View File

@@ -103,9 +103,11 @@ Then, the code for the monitor thread is as follows (put this in the same file a
{{ include_code("_code-samples/build-a-wallet/py/2_threaded.py", language="py", start_with="class XRPLMonitorThread", end_before="class TWaXLFrame") }}
This code defines a `Thread` subclass for the worker. When the thread is created, it starts an event loop, which means it's waiting for async tasks and functions to be created. The `watch_xrpl()` function is an example of a such a task (which the GUI thread starts when it's ready): connects to the XRP Ledger, then calls the [subscribe method][] to be notified whenever a new ledger is validated. It uses the immediate response _and_ all later subscription stream messages to trigger updates of the GUI.
This code defines a `Thread` subclass for the worker. When the thread starts, it sets up an event loop, which waits for async tasks to be created and run. The code uses [asyncio's Debug Mode](https://docs.python.org/3/library/asyncio-dev.html#asyncio-debug-mode) so that the console shows any errors that occur in async tasks.
**Tip:** Define worker jobs like this using `async def` instead of `def` so that you can use the `await` keyword in them; you need to use `await` to get the response to the [`AsyncWebsocketClient.request()` method](https://xrpl-py.readthedocs.io/en/stable/source/xrpl.asyncio.clients.html#xrpl.asyncio.clients.AsyncWebsocketClient.request). Normally, you would also need to use `await` or something similar to get the response to functions defined with `async def` too; but, in this app the `run_bg_job()` helper takes care of that in a different way.
The `watch_xrpl()` function is an example of a such a task (which the GUI thread starts when it's ready): it connects to the XRP Ledger, then calls the [subscribe method][] to be notified whenever a new ledger is validated. It uses the immediate response _and_ all later subscription stream messages to trigger updates of the GUI.
**Tip:** Define worker jobs like this using `async def` instead of `def` so that you can use the `await` keyword in them; you need to use `await` to get the response to the [`AsyncWebsocketClient.request()` method](https://xrpl-py.readthedocs.io/en/stable/source/xrpl.asyncio.clients.html#xrpl.asyncio.clients.AsyncWebsocketClient.request). Normally, you would also need to use `await` or something similar to get the response from any function you define with `async def`; but, in this app, the `run_bg_job()` helper takes care of that in a different way.
Update the code for the main thread and GUI frame to look like this: