refactor ipython integration

leylines-support/02-dask.ipy

@@ -4,36 +4,15 @@ ipy = __import__("IPython")
 @ipy.core.magic.needs_local_scope
 def dask(line, local_ns):
     "initializes dask"
-    from distributed.client import default_client
-    from distributed.diagnostics.progressbar import TextProgressBar
-    from distributed import futures_of
-    from tqdm import tqdm
 
-    class TqdmBar(TextProgressBar):
-        def __init__(self, *args, **kwargs):
-            self.p = tqdm(desc="scheduling...")
-            self.last = None
-            TextProgressBar.__init__(self, *args, **kwargs)
-        def _draw_bar(self, remaining, all, **kwargs):
-            if not all:
-                return
-            if self.last is None:
-                self.last = 0
-                self.p.set_description("🦈")
-                self.p.reset(total=all)
-            self.p.update((all - remaining) - self.last)
-            self.last = (all - remaining)
-        def _draw_stop(self, **kwargs):
-            self.p.close()
-
-    def tqdmprogress(future):
-        futures = futures_of(future)
-        if not isinstance(futures, (set, list)):
-            futures = [futures]
-        TqdmBar(futures, complete=True)
+    from leylines import get_server_node, DEFAULT_PORT, db
+    from leylines.dask import init_dask, tqdmprogress
 
     local_ns['tqdmprogress'] = tqdmprogress
 
+    client = init_dask()
+    local_ns['client'] = client
+
     def upload(client, file):
         import dask
         import distributed
@@ -46,22 +25,14 @@ def dask(line, local_ns):
 
         return dask.delayed(get_file)()
 
-    try:
-        default = default_client()
-        local_ns['client'] = default
-        local_ns['upload'] = lambda file: upload(client, file)
-        return
-    except ValueError:
-        pass
-    from distributed import Client
-    import re
-    from leylines import get_server_node, DEFAULT_PORT, db
+    local_ns['upload'] = lambda file: upload(client, file)
+
     server_node = get_server_node()
     workers = [node for node in db.get_nodes()
                if node.id != server_node.id and node.ssh_key is not None]
     dest = f"{server_node.ip}:{DEFAULT_PORT}"
-    print("connecting to APEX at", dest)
-    client = Client(dest)
+    print("connected to APEX at", dest)
+
     workers_by_ip = {str(node.ip):node for node in workers}
     workers_status = {str(node.ip):False for node in workers}
     for addr, info in client.scheduler_info()["workers"].items():
@@ -71,8 +42,6 @@ def dask(line, local_ns):
             print(f"{node.name} ({node.ip}): up")
         else:
             print(f"{node.name} ({node.ip}): down")
-    local_ns['client'] = client
-    local_ns['upload'] = lambda file: upload(client, file)
 
 @ipy.core.magic.register_line_magic
 @ipy.core.magic.needs_local_scope

leylines/leylines/dask.py

@@ -0,0 +1,46 @@
+import os
+
+from distributed.client import default_client
+from distributed.diagnostics.progressbar import TextProgressBar
+from distributed import Client, futures_of
+from tqdm import tqdm
+
+from leylines import get_server_node, DEFAULT_PORT
+
+def init_dask():
+    "initializes dask"
+
+    try:
+        default = default_client()
+        return default
+    except ValueError:
+        pass
+    server_node = get_server_node()
+    dest = f"{server_node.ip}:{DEFAULT_PORT}"
+    client = Client(dest)
+    return client
+
+
+class DaskTqdmBar(TextProgressBar):
+    def __init__(self, *args, **kwargs):
+        self.p = tqdm(desc="scheduling...")
+        self.last = None
+        TextProgressBar.__init__(self, *args, **kwargs)
+    def _draw_bar(self, remaining, all, **kwargs):
+        if not all:
+            return
+        if self.last is None:
+            self.last = 0
+            self.p.set_description("🦈")
+            self.p.reset(total=all)
+        self.p.update((all - remaining) - self.last)
+        self.last = (all - remaining)
+    def _draw_stop(self, **kwargs):
+        self.p.close()
+
+
+def tqdmprogress(future):
+    futures = futures_of(future)
+    if not isinstance(futures, (set, list)):
+        futures = [futures]
+    DaskTqdmBar(futures, complete=True)