91 lines
2.7 KiB
Python
91 lines
2.7 KiB
Python
from pycsdr.modules import Buffer, Writer
|
|
|
|
|
|
class Chain:
|
|
def __init__(self, *workers):
|
|
self.reader = None
|
|
self.writer = None
|
|
self.clientReader = None
|
|
self.workers = list(workers)
|
|
for i in range(1, len(self.workers)):
|
|
self._connect(self.workers[i - 1], self.workers[i])
|
|
|
|
def _connect(self, w1, w2):
|
|
writer = Buffer(w1.getOutputFormat())
|
|
w1.setWriter(writer)
|
|
w2.setReader(writer.getReader())
|
|
|
|
def setReader(self, reader):
|
|
if self.reader is reader:
|
|
return
|
|
self.reader = reader
|
|
if self.workers:
|
|
self.workers[0].setReader(reader)
|
|
|
|
def setWriter(self, writer):
|
|
if self.writer is writer:
|
|
return
|
|
self.writer = writer
|
|
if self.workers:
|
|
self.workers[-1].setWriter(writer)
|
|
|
|
def stop(self):
|
|
for w in self.workers:
|
|
w.stop()
|
|
if self.clientReader is not None:
|
|
# TODO should be covered by finalize
|
|
self.clientReader.stop()
|
|
self.clientReader = None
|
|
|
|
def getOutputFormat(self):
|
|
if self.workers:
|
|
return self.workers[-1].getOutputFormat()
|
|
else:
|
|
raise BufferError("getOutputFormat on empty chain")
|
|
|
|
def replace(self, index, newWorker):
|
|
if index >= len(self.workers):
|
|
raise IndexError("Index {} does not exist".format(index))
|
|
|
|
self.workers[index].stop()
|
|
self.workers[index] = newWorker
|
|
|
|
if index == 0:
|
|
if self.reader is not None:
|
|
newWorker.setReader(self.reader)
|
|
else:
|
|
previousWorker = self.workers[index - 1]
|
|
buffer = Buffer(previousWorker.getOutputFormat())
|
|
previousWorker.setWriter(buffer)
|
|
newWorker.setReader(buffer.getReader())
|
|
|
|
if index == len(self.workers) - 1:
|
|
if self.writer is not None:
|
|
newWorker.setWriter(self.writer)
|
|
else:
|
|
nextWorker = self.workers[index + 1]
|
|
buffer = Buffer(newWorker.getOutputFormat())
|
|
newWorker.setWriter(buffer)
|
|
nextWorker.setReader(buffer.getReader())
|
|
|
|
def pump(self, write):
|
|
if self.writer is None:
|
|
self.setWriter(Buffer(self.getOutputFormat()))
|
|
self.clientReader = self.writer.getReader()
|
|
|
|
def copy():
|
|
run = True
|
|
while run:
|
|
data = None
|
|
try:
|
|
data = self.clientReader.read()
|
|
except ValueError:
|
|
pass
|
|
if data is None:
|
|
run = False
|
|
else:
|
|
write(data)
|
|
|
|
return copy
|
|
|