Commit Graph

66 Commits

Author SHA1 Message Date
Tatsuhiro Tsujikawa 4cad48da16 Reset cycle to 0 if stream has only 1 direct descendant 2015-08-29 23:44:58 +09:00
Tatsuhiro Tsujikawa 059280d1a5 Add stream public API
The intention of this stream API is give server application about
stream dependency information, so that it can utilize it for better
scheduling of stream processing.  We have no plan to add object
oriented API based on stream object.
2015-08-19 23:04:06 +09:00
Tatsuhiro Tsujikawa 6a511aef0a Use remove/push combination instead of <= for performance 2015-08-18 00:21:42 +09:00
Tatsuhiro Tsujikawa 5b59e46e2b Rewrite priority handling
We now use priority queue per stream, which contains the stream which
has ready to send a frame, or one of its descendants have a frame to
send.  We maintain invariant that if a stream is queued, then its
ancestors are also queued (except for root).  When we re-schedule
stream after transmission, we re-schedule all ancestors, so that
streams on the other path can get a chance to send.  This is basically
the same mechanism h2o project uses, but there are differences in the
details.
2015-08-17 22:35:50 +09:00
Tatsuhiro Tsujikawa d1e49a196d Remove restriction in regard to number of stream in dependency tree
Previously, the number of stream in one dependency tree (not including
root) is limited to 120.  This is due to the fact that we use
recursive calls to traverse trees.  Now we replaced recursive calls
with loop, we can remove this limitation.  Also now all streams are
descendant of root stream, rather than linked list of individual
subtree root.
2015-08-15 00:53:09 +09:00
Tatsuhiro Tsujikawa f7fa9eb21b Fix sum_norest_weight calculation bug in stream dependency tree 2015-08-14 01:27:50 +09:00
Tatsuhiro Tsujikawa 9e82687cbe Fix compile error with --enable-werror 2015-06-26 23:21:01 +09:00
Tatsuhiro Tsujikawa 660f90e13f Add switch STREAM_DEP_DEBUG to enable runtime validation of depedency tree 2015-06-26 23:02:18 +09:00
Tatsuhiro Tsujikawa bab99af565 Fix unusual control flow in stream_update_dep_set_rest 2015-06-25 22:31:15 +09:00
Tatsuhiro Tsujikawa d6ca95a0c9 Fix sibling's item is not queued when ancestor's item is detached 2015-06-24 22:18:07 +09:00
Tatsuhiro Tsujikawa 1945d0f02a Fix assertion failure in nghttp2_stream.c
This is regression introduced in
46b70c1db8.
2015-06-23 23:04:53 +09:00
Tatsuhiro Tsujikawa 46b70c1db8 Optimize dependency based priority code to Firefox style tree
While this commit optimizes dependency routine to Firefox style tree,
the other use cases (e.g., linear chain) are also improved
dramatically as well.
2015-06-20 22:11:24 +09:00
Tatsuhiro Tsujikawa 43b3640836 Slight code cleanup 2015-06-05 22:06:49 +09:00
Tatsuhiro Tsujikawa f2cf2b625c Replace priority queue with linear queue where possible
After reviewing codebase, only queue for DATA frames requires
priorities.  Other frames can be replaced multiple linear queues.
Replacing priority queue with linear queue allows us to simplify
codebase a bit; for example, now nghttp2_session.next_seq is gone.
2015-04-25 00:56:46 +09:00
Tatsuhiro Tsujikawa 1a12a9b397 Penalize cycle according to effective weight 2015-04-17 21:17:22 +09:00
Tatsuhiro Tsujikawa 57644e0256 Effectively revert 03c4092862
This is not mandated by spec.  Also it may work badly with Firefox
style dependency tree usage.
2015-04-17 21:04:17 +09:00
Tatsuhiro Tsujikawa d4a22edeb3 Don't do fancy stuff yet 2015-04-16 22:58:25 +09:00
Tatsuhiro Tsujikawa 1a8da6caec Update doc 2015-04-16 21:40:39 +09:00
Tatsuhiro Tsujikawa dc335b9025 Improve weight handling a bit 2015-04-16 21:38:13 +09:00
Tatsuhiro Tsujikawa b2bb6f1db1 Fix android NDK build error 2015-04-07 21:25:05 +09:00
Alexis La Goutte 3b6b4ff066 Fix Value stored to 'rv' is never read found by Clang Analyzer 2015-04-01 13:03:22 +02:00
Tatsuhiro Tsujikawa dbd0f032ce Fix -Werror=cast-align error on 32 bit platform
Fixes GH-172
2015-03-03 22:36:24 +09:00
Tatsuhiro Tsujikawa b157d4ebb2 Validate HTTP semantics by default
Previously we did not check HTTP semantics and it is left out for
application.  Although checking is relatively easy, but they are
scattered and error prone.  We have implemented these checks in our
applications and also feel they are tedious.  To make application
development a bit easier, this commit adds basic HTTP semantics
validation to library code.  We do following checks:

server:

* HEADERS is either request header or trailer header.  Other type of
header is disallowed.

client:

* HEADERS is either zero or more non-final response header or final
  response header or trailer header.  Other type of header is
  disallowed.

For both:

* Check mandatory pseudo header fields.
* Make sure that content-length matches the amount of DATA we
  received.

If validation fails, RST_STREAM of type PROTOCOL_ERROR is issued.
2015-02-20 01:01:10 +09:00
Tatsuhiro Tsujikawa eec8870ac1 Fix bug that client may send PROTOCOL_ERROR upon canceled push stream
Previously we treat stream in NGHTTP2_STREAM_RESERVED state specially,
that is we don't increment or decrement streams counts if stream is in
that state.  Because of this, we don't change the stream state to
NGHTTP2_STREAM_CLOSING if stream is in NGHTTP2_STREAM_RESERVED.  But
it turns out that it causes a problem.  If client canceled pushed
stream before push response HEADERS, stream is still in
NGHTTP2_STREAM_RESERVED state.  If push response HEADERS arrived in
this state, library happily accepts it and passed to application.

With this commit, this bug was corrected.  We now change stream state
to NGHTTP2_STREAM_CLOSING even if it was in NGHTTP2_STREAM_RESERVED
state.  We now use NGHTTP2_STREAM_FLAG_PUSH to determine whether we
have to increase/decrase stream count.
2015-02-09 22:23:20 +09:00
Tatsuhiro Tsujikawa 7c0a0c495d Rename nghttp2_stream.data_item to nghttp2_stream.item and related functions
Initially, we use nghttp2_stream.data_item to refer only item with
DATA frame.  But recently we use it to refer HEADERS frame as well.
So it is better to call just item rather than data_item.  This applies
to all related functions.
2014-12-20 21:48:31 +09:00
Tatsuhiro Tsujikawa d39b56adaa Remove unused nghttp2_stream.blocked_sent 2014-11-30 17:41:40 +09:00
Tatsuhiro Tsujikawa b1f807abd1 Reformat lines with clang-format-3.5 2014-11-27 23:56:30 +09:00
Alexis La Goutte bac44d7ffb Fix -Werror=unused-parameter using _U_ macro 2014-11-25 17:08:09 +01:00
Tatsuhiro Tsujikawa b7c0576eb5 Make certain type of HEADERS subject to priority
We make following HEADERS under priority control:
* push response HEADERS
* HEADERS submitted by nghttp2_submit_response

Currently, HEADERS submitted by nghttp2_submit_headers is not attached
to stream.  This is because it may be used as non-final response
header and application may submit final response using
nghttp2_submit_response without checking non-final response header
transmission.
2014-11-24 15:25:19 +09:00
Tatsuhiro Tsujikawa ae93f6345c Allow PRIORITY frame at anytime.
Allowing PRIORITY frame at anytime so that PRIORITY frame to idle
stream can create anchor node in dependency tree.  In this change, we
open stream with new NGHTTP2_STREAM_IDLE state, which is linked in
session->closed_stream_head and is treated as if it is closed stream.
One difference is that if the stream is opened, we remove it from
linked list and change the state to the appropriate one.  To O(1)
removal from linked list, we change session->closed_stream_head to
doubly linked list.
2014-11-24 15:25:19 +09:00
Tatsuhiro Tsujikawa 62ede05c09 Fix heap-use-after-free due to duplicated push of DATA item 2014-11-06 23:47:41 +09:00
Tatsuhiro Tsujikawa bc8a583184 Refactor stream tree code 2014-10-16 21:59:52 +09:00
Tatsuhiro Tsujikawa 502ff24568 Avoid iterate siblings when adding/removing stream tree 2014-10-16 01:12:59 +09:00
Tatsuhiro Tsujikawa 402c262de5 Push stream to queue after effective weight was calculated 2014-10-08 22:44:02 +09:00
Tatsuhiro Tsujikawa 03c4092862 Distribute closed or blocked stream's weight to its siblings
This also means that at least one stream whose dpri is
NGHTTP2_STREAM_DPRI_TOP exists, its siblings descendants have no
chance to send streams, even if their parent stream has
NGHTTP2_STREAM_DPRI_NODATA.
2014-10-07 23:52:36 +09:00
Tatsuhiro Tsujikawa be0f6dcaaf Clear 2 types of stream deferred flag indenpendently
Previously when nghttp2_stream_resume_deferred_data() is called,
deferred flags in stream->flags are all cleared.  This is not ideal
because if application returned NGHTTP2_ERR_DEFERRED, and also that
stream is deferred by flow control, then all flags are cleared and
read callback will be invoked again.  This commit fixes this issue.
This changes error condition of nghttp2_session_resume_data().
Previously we return error if stream was deferred by flow control.
Now we don't return error in this case.  We just clear
NGHTTP2_FLAG_DEFERRED_USER and if still
NGHTTP2_FLAG_DEFERRED_FLOW_CONTROL is set, just return 0.
2014-09-26 21:32:17 +09:00
Tatsuhiro Tsujikawa b2f88f8fe3 Fix memory leak around stream->data_item
Previously we missed the case where stream->data_item is not deleted
and it caused leak.  Now stream->data_item is properly deleted when
session is deleted.  We decided not to delete data_item in
nghttp2_stream_free() since we need nghttp2_session to decide whether
data_item should be deleted or not there.
2014-09-17 23:16:00 +09:00
Tatsuhiro Tsujikawa 079db14d45 Add nghttp2_session_consume() API
Reworked no automatic WINDOW_UPDATE feature.  We added new API
nghttp2_session_consume() which tells the library how many bytes are
consumed by the application.  Instead of submitting WINDOW_UPDATE by
the application, the library is now responsible to submit
WINDOW_UPDATE based on consumed bytes.  This is more reliable method,
since it enables us to properly send WINDOW_UPDATE for stream and
connection individually.  The previous implementation of nghttpx had
broken connection window management.
2014-07-31 23:05:53 +09:00
Tatsuhiro Tsujikawa 9b174bf5c9 Fix compile error with -Wshorten-64-to-32
The original patch was contributed by Alexis La Goutte
2014-06-11 23:37:16 +09:00
Tatsuhiro Tsujikawa 2778e4aafc Remove useless debug code in nghttp2_stream_roots_add() 2014-05-16 22:30:59 +09:00
Tatsuhiro Tsujikawa 3e3d51842b Interleave stream DATA more naturally
We simulate resource sharing by decreasing weight.  The thing is if
weight is wrapped, that item continues to send DATA until its weight
gets lowered under the other items.  This commits fix this issue.
2014-05-08 23:07:29 +09:00
Tatsuhiro Tsujikawa 51e79c5a3d Remove debug output 2014-05-07 23:23:43 +09:00
Tatsuhiro Tsujikawa cc7929bdcc Fix possible SIGFPE 2014-04-27 14:40:10 +09:00
Tatsuhiro Tsujikawa 6bb410d603 Implement BLOCKED frame 2014-04-25 00:38:24 +09:00
Tatsuhiro Tsujikawa 853c9888d9 Distribute effective weight among only streams with marked as top
If stream with dpri value of no_data, we check any its descendant has
stream with dpri value of top.  If so, we have to distribute of its
portion of weight to its descendants.
2014-04-24 23:37:40 +09:00
Tatsuhiro Tsujikawa aa4d43f31e Allow exclusive dependency to stream 0 2014-04-17 21:18:18 +09:00
Tatsuhiro Tsujikawa ac86b51e37 Implement simplified dependency based priority 2014-04-15 22:55:07 +09:00
Tatsuhiro Tsujikawa 6cddfaf263 nghttp2_stream_resume_deferred_data: Call stream_update_dep_on_attach_data
.. instead of nghttp2_stream_attach_data() internal API
2014-04-03 15:52:21 +09:00
Tatsuhiro Tsujikawa ac2a8ef4a2 Fix bug that transfer stuck when stream marked as top is deferred 2014-04-03 15:48:51 +09:00
Tatsuhiro Tsujikawa 580a19e097 nghttp2_stream_detach_deferred_data -> nghttp2_stream_resume_deferred_data 2014-04-02 22:58:06 +09:00