Hot reload#362

rmarren1 · 2018-09-12T00:42:49Z

Neat, didn't know you could do this.

rmarren1 · 2018-09-12T00:42:03Z

os.path.getmtime might be cleaner here. I thought there was platform dependence issue at first (since otherwise why would they even implement os.path.getmtime if you can just os.stat(path).st_mtime, but it turns out thats exactly what os.path.getmtime does.

Yea, some methods in that module seems to be wrapper around os.stat. I'm used to os.stat so I just do that.

👍, either way is good, just seemed a bit strange, seems to break "There should be one-- and preferably only one --obvious way to do it".

I think the os module predates the PEP's.

rmarren1 · 2018-09-12T00:42:49Z

Neat, didn't know you could do this.

rmarren1 · 2018-09-12T00:42:03Z

os.path.getmtime might be cleaner here. I thought there was platform dependence issue at first (since otherwise why would they even implement os.path.getmtime if you can just os.stat(path).st_mtime, but it turns out thats exactly what os.path.getmtime does.

Yea, some methods in that module seems to be wrapper around os.stat. I'm used to os.stat so I just do that.

👍, either way is good, just seemed a bit strange, seems to break "There should be one-- and preferably only one --obvious way to do it".

I think the os module predates the PEP's.

rmarren1 · 2018-09-12T00:42:49Z

Neat, didn't know you could do this.

rmarren1 · 2018-09-12T00:42:03Z

os.path.getmtime might be cleaner here. I thought there was platform dependence issue at first (since otherwise why would they even implement os.path.getmtime if you can just os.stat(path).st_mtime, but it turns out thats exactly what os.path.getmtime does.

Yea, some methods in that module seems to be wrapper around os.stat. I'm used to os.stat so I just do that.

👍, either way is good, just seemed a bit strange, seems to break "There should be one-- and preferably only one --obvious way to do it".

I think the os module predates the PEP's.

rmarren1 · 2018-09-12T00:42:49Z

Neat, didn't know you could do this.

rmarren1 · 2018-09-12T00:42:03Z

os.path.getmtime might be cleaner here. I thought there was platform dependence issue at first (since otherwise why would they even implement os.path.getmtime if you can just os.stat(path).st_mtime, but it turns out thats exactly what os.path.getmtime does.

Yea, some methods in that module seems to be wrapper around os.stat. I'm used to os.stat so I just do that.

👍, either way is good, just seemed a bit strange, seems to break "There should be one-- and preferably only one --obvious way to do it".

I think the os module predates the PEP's.

rmarren1 · 2018-09-12T00:42:49Z

Neat, didn't know you could do this.

rmarren1 · 2018-09-12T00:42:03Z

os.path.getmtime might be cleaner here. I thought there was platform dependence issue at first (since otherwise why would they even implement os.path.getmtime if you can just os.stat(path).st_mtime, but it turns out thats exactly what os.path.getmtime does.

Yea, some methods in that module seems to be wrapper around os.stat. I'm used to os.stat so I just do that.

👍, either way is good, just seemed a bit strange, seems to break "There should be one-- and preferably only one --obvious way to do it".

I think the os module predates the PEP's.

rmarren1 · 2018-09-12T00:42:49Z

Neat, didn't know you could do this.

rmarren1 · 2018-09-12T00:42:03Z

os.path.getmtime might be cleaner here. I thought there was platform dependence issue at first (since otherwise why would they even implement os.path.getmtime if you can just os.stat(path).st_mtime, but it turns out thats exactly what os.path.getmtime does.

Yea, some methods in that module seems to be wrapper around os.stat. I'm used to os.stat so I just do that.

👍, either way is good, just seemed a bit strange, seems to break "There should be one-- and preferably only one --obvious way to do it".

I think the os module predates the PEP's.

rmarren1 · 2018-09-12T00:42:49Z

Neat, didn't know you could do this.

rmarren1 · 2018-09-12T00:42:03Z

os.path.getmtime might be cleaner here. I thought there was platform dependence issue at first (since otherwise why would they even implement os.path.getmtime if you can just os.stat(path).st_mtime, but it turns out thats exactly what os.path.getmtime does.

Yea, some methods in that module seems to be wrapper around os.stat. I'm used to os.stat so I just do that.

👍, either way is good, just seemed a bit strange, seems to break "There should be one-- and preferably only one --obvious way to do it".

I think the os module predates the PEP's.

rmarren1 · 2018-09-12T00:42:49Z

Neat, didn't know you could do this.

rmarren1 · 2018-09-12T00:42:03Z

os.path.getmtime might be cleaner here. I thought there was platform dependence issue at first (since otherwise why would they even implement os.path.getmtime if you can just os.stat(path).st_mtime, but it turns out thats exactly what os.path.getmtime does.

Yea, some methods in that module seems to be wrapper around os.stat. I'm used to os.stat so I just do that.

👍, either way is good, just seemed a bit strange, seems to break "There should be one-- and preferably only one --obvious way to do it".

I think the os module predates the PEP's.

-Original file line number
+Diff line change
@@ Expand Up / @@ -146,7 +146,8 @@ disable=invalid-name, @@
  no-else-return,
  useless-object-inheritance,
  possibly-unused-variable,
- too-many-lines
+ too-many-lines,
+ too-many-statements
 # Enable the message, report, category or checker with the given id(s). You can
 # either give multiple identifier separated by comma (,) or put this option
@@ Expand Down @@

-Original file line number
+Diff line change
@@ -1,3 +1,8 @@
+## 0.30.0 - 2018-11-14
+## Added
+- Hot reload from the browser [#362](https://github.com/plotly/dash/pull/362)
+- Silence routes logging with `dev_tools_silence_routes_logging`.
 ## 0.29.0 - 2018-11-06
 ## Added
 - Added component namespaces registry, collect the resources needed by component library when they are imported instead of crawling the layout. [#444](https://github.com/plotly/dash/pull/444)
@@ Expand Down @@

-Original file line number
+Diff line change
@@ Expand Up / @@ -22,7 +22,12 @@ def env_configs(): @@
  'DASH_COMPONENTS_CACHE_MAX_AGE',
  'DASH_INCLUDE_ASSETS_FILES',
  'DASH_SERVE_DEV_BUNDLES',
- 'DASH_DEBUG'
+ 'DASH_DEBUG',
+ 'DASH_HOT_RELOAD',
+ 'DASH_HOT_RELOAD_INTERVAL',
+ 'DASH_HOT_RELOAD_WATCH_INTERVAL',
+ 'DASH_HOT_RELOAD_MAX_RETRY',
+ 'DASH_SILENCE_ROUTES_LOGGING'
  )})
@@ Expand Down @@

-Original file line number
+Diff line change
@@ -1,3 +1,6 @@
+import uuid
 def interpolate_str(template, **data):
  s = template
  for k, v in data.items():
@@ Expand All @@
  '{}="{}"'.format(k, v) for k, v in attributes.items()]))
+def generate_hash():
+ return str(uuid.uuid4().hex).strip('-')
 def get_asset_path(
  requests_pathname,
  routes_pathname,
  asset_path,
  asset_url_path):
  i = requests_pathname.rfind(routes_pathname)
  req = requests_pathname[:i]
@@ Expand Down @@

-Original file line number
+Diff line change
@@ -0,0 +1,36 @@
+import collections
+import os
+import re
+import time
+def watch(folders, on_change, pattern=None, sleep_time=0.1):
+ pattern = re.compile(pattern) if pattern else None
+ watched = collections.defaultdict(lambda: -1)
+ def walk():
+ walked = []
+ for folder in folders:
+ for current, _, files, in os.walk(folder):
+ for f in files:
+ if pattern and not pattern.search(f):
+ continue
+ path = os.path.join(current, f)
+ info = os.stat(path)
+ new_time = info.st_mtime
+ if new_time > watched[path] > 0:
+ on_change(path, new_time, False)
+ watched[path] = new_time
+ walked.append(path)
+ # Look for deleted files
+ for w in [x for x in watched.keys() if x not in walked]:
+ del watched[w]
+ on_change(w, -1, True)
+ while True:
+ walk()
+ time.sleep(sleep_time)

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