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The HTTP host's end-to-end checks (documents against the earlier server,
lending, kill -9 durability, JSON, timers, links, webhooks and answers) sat
in aup's tests, so a change to the host was verified from the toolchain.
They now live in tests/check.py; make check builds their apps with the
sibling aup and runs them after the unit tests, which stay beside their
parts. Design 009 states the rule for all three repositories.
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After each save the owner walked the whole outbox to find the sends
not yet queued, so a receiver long down made every save walk the
backlog. pure_app_outbox_newest visits saved sends newest first, and
the owner stops once every wired output reaches the number it queued
last, then queues what it found in order.
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The final answer to each send of a wired output (a 2xx, or a 4xx but
408 and 429) becomes a message event of the given input: fields from
the answer's JSON object by name, other members skipped; a field the
answer lacks from the send's field of that name and type, so the
request's own id is there; a u32 http_status field is the status. It is
applied with the send's number from the wire's source, before the send
is trimmed and in the same save, so an answer that comes again after a
restart (the API repeating itself for the Idempotency-Key) applies once.
Sends that wait for answers go one per request; answers are saved with
the next round, or at once when none waits.
A server that writes an answer in pieces holds the second until the
first is acknowledged, and a delayed acknowledgement stalled every
answer 40 ms: the client now acknowledges at once (TCP_QUICKACK) after
each read. Against a payments API that answers 200 or 402, with the
sender killed (-9) midway, paid and declined orders matched the API's
answers one to one.
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A wire to an https:// URL speaks TLS 1.2 or later through OpenSSL: the
receiver's certificate must chain to the system's CAs (or to the file
--send-ca names) and name its host (SNI and SSL_set1_host, or the IP
address). An untrusted receiver gets nothing: the send stays in the
outbox, the wire logs it and tries again every 10 s. pure-serve now
links libssl and libcrypto.
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pure-serve --send OUTPUT=http://host:port/path wires an output: after
every save the owner queues the new sends as JSON (fields and groups)
and a thread per output posts them in order with X-Pure-Source,
X-Pure-Sequence and Idempotency-Key. A 2xx, or a Pure receiver's
refusal, delivers; the owner then trims. 408, 429, 5xx and no answer
are sent again after a pause growing to 10 s, other answers every 10 s:
nothing is dropped. A Pure receiver applies a delivered message with
pure_app_deliver (now taking placed fields) and advertises
X-Pure-Batch: 256; the sender then posts up to that many numbers in a
row as one JSON array (X-Pure-Count), applied in order in one burst
with one save.
Delivery kept up with orders once batched (391 deliveries/s one at a
time; a backlog of 20,000 went at 60k/s). With four clients ordering,
killing the receiver and then the sender (-9) left the receiver's count
and total equal to what the sender saved, five times and under ASan.
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