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tools/pyboard.py: Don't accumulate output data if data_consumer used.

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Prior to this patch, when a lot of data was output by a running script
pyboard.py would try to capture all of this output into the "data"
variable, which would gradually slow down pyboard.py to the point where it
would have large CPU and memory usage (on the host) and potentially lose
data.

This patch fixes this problem by not accumulating the data in the case that
the data is not needed, which is when "data_consumer" is used.
This commit is contained in:
Damien George 2019-04-25 13:24:32 +10:00
parent aa7b32c811
commit 56f6ceba7f
1 changed files with 6 additions and 1 deletions
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7
tools/pyboard.py
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@ -261,6 +261,9 @@ class Pyboard:
self.serial.close()
def read_until(self, min_num_bytes, ending, timeout=10, data_consumer=None):
# if data_consumer is used then data is not accumulated and the ending must be 1 byte long
assert data_consumer is None or len(ending) == 1
data = self.serial.read(min_num_bytes)
if data_consumer:
data_consumer(data)
@ -270,9 +273,11 @@ class Pyboard:
break
elif self.serial.inWaiting() > 0:
new_data = self.serial.read(1)
data = data + new_data
if data_consumer:
data_consumer(new_data)
data = new_data
else:
data = data + new_data
timeout_count = 0
else:
timeout_count += 1