commit 7dcfe320c5cc7e7792018f70f66cc2824e18dab7
author bnc <bnc@google.com> Thu Mar 18 09:49:08 2021 -0700
committer Copybara-Service <copybara-worker@google.com> Thu Mar 18 09:49:43 2021 -0700
tree 027706e537f3dbda8732b650a9a3026893080d30
parent be191287c8c302e35826f4854a0b362fea632551

Refactor HPACK/QPACK lookup entry.

Before this CL, an HpackEntry could serve as a storage entry: to store strings
in a deque, for easy FIFO insertion and deletion; or as a reference entry used
for lookup: to point to strings stored in storage entries by means of
string_views, used in a set to allow convenient lookup by name and value without
having to store duplicate copies of strings.

This CL creates a dedicated HpackLookupEntry struct, so that the EntryType and
the string_view parts of HpackEntry can be removed in a future CL, substantially
reducing HpackEntry size and complexity.

Note that previously separate EntryHasher and EntriesEq functors were used,
mostly because until recently STL containers were used in Chromium and Absail
ones internally, and the hasher had to be defined as a template parameter to
work with both, and partially because conceptually two HpackEntries with same
string values were not equal, so operator==() would have been a lie.  Now both
obstacles have been removed, allowing HpackLookupEntry to define operator==()
and an Absail-style hasher, eliminating the need for extra container template
parameters.

Also remove unused HpackHeaderTable::DebugLogTableState().

PiperOrigin-RevId: 363679331
Change-Id: Iad2f198c57e8e60c2b6e0e679b391d50d1dbcf7a