I have a couple of applications where I need to do some generic coding
with protobufs. In one case I have a gui that needs to display
selected contents out of a message, and in another case I need to
transcode from a different message format into a protobuf. It is
trivial to hand-write hardcoded stuff for both of these, but it
violates the DRY principle, and is error prone, etc.
What I want to do in both cases (the gui) is, by conventionally using
the same names for the gui or other message fields as the fields in
the protobuf messages, use introspection to do the field mapping.
So, for example, given a list of PyQT widgets, I would use the widget
names to go find a like-named field in the protobuf message. But
since the protobuf message is likely to be composite, and in fact it
might be a subfield I need, I have to do some serious introspection.
Also, I want to do this kind of at init time BEFORE I receive a
message.
For example, I might have a PyQT widget named tt_m1, and I want to get
the .temperatures.tt_m1.val field out of the following protobuf
message structure by setting up a mapping between the widget and the
protobuf field at init time. I'd like to do similar things in the
opposite direction: given a selected set of protobuf fields, transcode
from another message into protobuf contents.
Suggestions?
message Analog {
required double val = 1;
enum AnalogStatus {
SENSOR_NOMINAL = 0;
SENSOR_UNDER_LIMIT = 1;
SENSOR_OVER_LIMIT = 2;
SENSOR_FAULT = 3;
SENSOR_NO_DATA = 4;
}
required AnalogStatus status = 2;
optional double limit = 3;
}
message Temperatures {
optional Analog tt_m1 = 1;
optional Analog tt_m2 = 2;
optional Analog tt_m3 = 3;
optional Analog tt_m4 = 4;
}
message StatusUpdate {
...stuff...
optional Temperatures temperatures = 7;
...stuff...
}
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