Make arguments attributes, integrate with AutoContext

This makes them accessible to future "data analysis" methods.

artiq/language/context.py

@@ -26,7 +26,8 @@ class NoDefault:
 
 
 class Parameter(_AttributeKind):
-    """Represents a parameter for ``AutoContext`` to process.
+    """Represents a parameter (from the database) for ``AutoContext``
+    to process.
 
     :param default: Default value of the parameter to be used if not found
         in the database.
@@ -39,6 +40,18 @@ class Parameter(_AttributeKind):
         self.write_db = write_db
 
 
+class Argument(_AttributeKind):
+    """Represents an argument (specifiable at instance creation) for
+    ``AutoContext`` to process.
+
+    :param default: Default value of the argument to be used if not specified
+        at instance creation.
+
+    """
+    def __init__(self, default=NoDefault, write_db=False):
+        self.default = default
+
+
 class AutoContext:
     """Base class to automate device and parameter discovery.
 
@@ -112,22 +125,33 @@ class AutoContext:
                 p = getattr(self, k)
                 if isinstance(p, Parameter) and p.write_db:
                     self.mvs.register_parameter_wb(self, k)
+            if (not hasattr(self, k)
+                    or not isinstance(getattr(self, k), _AttributeKind)):
+                raise ValueError(
+                    "Got unexpected keyword argument: '{}'".format(k))
             setattr(self, k, v)
 
         for k in dir(self):
             v = getattr(self, k)
             if isinstance(v, _AttributeKind):
-                if self.mvs is None:
+                if isinstance(v, Argument):
-                    if (isinstance(v, Parameter)
+                    # never goes through MVS
-                            and v.default is not NoDefault):
+                    if v.default is NoDefault:
-                        value = v.default
+                        raise AttributeError(
-                    else:
+                            "No value specified for argument '{}'".format(k))
-                        raise AttributeError("Attribute '{}' not specified"
+                    value = v.default
-                                             " and no MVS present".format(k))
                 else:
-                    value = self.mvs.get_missing_value(k, v, self)
+                    if self.mvs is None:
-                    if isinstance(v, Parameter) and v.write_db:
+                        if (isinstance(v, Parameter)
-                        self.mvs.register_parameter_wb(self, k)
+                                and v.default is not NoDefault):
+                            value = v.default
+                        else:
+                            raise AttributeError("Attribute '{}' not specified"
+                                                 " and no MVS present".format(k))
+                    else:
+                        value = self.mvs.get_missing_value(k, v, self)
+                        if isinstance(v, Parameter) and v.write_db:
+                            self.mvs.register_parameter_wb(self, k)
                 setattr(self, k, value)
 
         self.build()

artiq/management/worker_impl.py

@@ -21,8 +21,8 @@ def run(dps, file, unit, arguments):
         unit = units[0]
     else:
         unit = getattr(module, unit)
-    unit_inst = unit(dps)
+    unit_inst = unit(dps, **arguments)
-    unit_inst.run(**arguments)
+    unit_inst.run()
 
 
 def get_object():

examples/photon_histogram.py

@@ -6,6 +6,9 @@ class PhotonHistogram(AutoContext):
     bdd = Device("dds")
     pmt = Device("ttl_in")
 
+    nbins = Argument(100)
+    repeats = Argument(100)
+
     @kernel
     def cool_detect(self):
         with parallel:
@@ -20,13 +23,13 @@ class PhotonHistogram(AutoContext):
         return self.pmt.count()
 
     @kernel
-    def run(self, nbins=100, repeats=100):
+    def run(self):
-        hist = [0 for _ in range (nbins)]
+        hist = [0 for _ in range(self.nbins)]
 
-        for i in range(repeats):
+        for i in range(self.repeats):
             n = self.cool_detect()
-            if n >= nbins:
+            if n >= self.nbins:
-                n = nbins - 1
+                n = self.nbins - 1
             hist[n] += 1
 
         print(hist)

examples/transport.py

@@ -19,6 +19,9 @@ class Transport(AutoContext):
     wait_at_stop = Parameter(100*us)
     speed = Parameter(1.5)
 
+    repeats = Argument(100)
+    nbins = Argument(100)
+
     def prepare(self, stop):
         t = transport_data["t"][:stop]*self.speed
         u = transport_data["u"][:stop]
@@ -91,27 +94,27 @@ class Transport(AutoContext):
         return self.detect()
 
     @kernel
-    def repeat(self, repeats, nbins):
+    def repeat(self):
-        self.histogram = [0 for _ in range(nbins)]
+        self.histogram = [0 for _ in range(self.nbins)]
 
-        for i in range(repeats):
+        for i in range(self.repeats):
             n = self.one()
-            if n >= nbins:
+            if n >= self.nbins:
-                n = nbins - 1
+                n = self.nbins - 1
             self.histogram[n] += 1
 
-    def scan(self, repeats, nbins, stops):
+    def scan(self, stops):
         for s in stops:
             self.histogram = []
             # non-kernel, calculate waveforms, build frames
             # could also be rpc'ed from repeat()
             self.prepare(s)
             # kernel part
-            self.repeat(repeats, nbins)
+            self.repeat()
             # live update 2d plot with current self.histogram
             # broadcast(s, self.histogram)
 
-    def run(self, repeats=100, nbins=100):
+    def run(self):
         # scan transport endpoint
         stops = range(10, len(transport_data["t"]), 10)
-        self.scan(repeats, nbins, stops)
+        self.scan(stops)

frontend/artiq_run.py

@@ -92,8 +92,8 @@ def main():
                 print("Failed to parse run arguments")
                 sys.exit(1)
 
-            unit_inst = unit(dps)
+            unit_inst = unit(dps, **arguments)
-            unit_inst.run(**arguments)
+            unit_inst.run()
 
             if dps.parameter_wb:
                 print("Modified parameters:")