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authorProfpatsch <mail@profpatsch.de>2021-03-30T02·49+0200
committerProfpatsch <mail@profpatsch.de>2021-04-01T07·28+0000
commit59a9955d753d8f9deb705d36922f6e8d77307f1d (patch)
tree525f8269bfa15160b58d2d73498306c0899c837e /bin
parent53d8dd6a1e56533dbe33a711bdec792cd477f0c7 (diff)
feat(users/Profpatsch/netencode): fully streaming parser r/2382
In order to arbitrarily split netencode over multiple reads, we need
to make the parser completely streaming, so that it recognizes all
cases where it needs more input.

Luckily, this is fairly trivial, after working around a bunch of
overeager parsing.

The tricky part was the giant `alt`, where inner parsers would start
consuming input and thus become incomplete when they fail afterwards.
Sinc the format *always* starts the different types with one
discriminator char, we can use that to instantly return the parser and
try the next one instead.

The other tricky part was that lists and records would parse all inner
elements and then choke on the empty string after the last element,
because the inner parser would consume at least the descriminator, and
an empty string is always `Incomplete`. We wrap these into a small
combinator which plays nice with `many0` in that regard.

Change-Id: Ib8d15d9a7cab19d432c6b24a35fcad6a5a72b246
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2704
Tested-by: BuildkiteCI
Reviewed-by: Profpatsch <mail@profpatsch.de>
Reviewed-by: sterni <sternenseemann@systemli.org>
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