mirror of
https://gitea.invidious.io/iv-org/litespeed-quic.git
synced 2024-08-15 00:53:43 +00:00
c51ce3387f
- [API Change] Sendfile-like functionality is gone. The stream no longer opens files and deals with file descriptors. (Among other things, this makes the code more portable.) Three writing functions are provided: lsquic_stream_write lsquic_stream_writev lsquic_stream_writef (NEW) lsquic_stream_writef() is given an abstract reader that has function pointers for size() and read() functions which the user can implement. This is the most flexible way. lsquic_stream_write() and lsquic_stream_writev() are now both implemented as wrappers around lsquic_stream_writef(). - [OPTIMIZATION] When writing to stream, be it within or without the on_write() callback, place data directly into packet buffer, bypassing auxiliary data structures. This reduces amount of memory required, for the amount of data that can be written is limited by the congestion window. To support writes outside the on_write() callback, we keep N outgoing packet buffers per connection which can be written to by any stream. One half of these are reserved for the highest priority stream(s), the other half for all other streams. This way, low-priority streams cannot write instead of high-priority streams and, on the other hand, low-priority streams get a chance to send their packets out. The algorithm is as follows: - When user writes to stream outside of the callback: - If this is the highest priority stream, place it onto the reserved N/2 queue or fail. (The actual size of this queue is dynamic -- MAX(N/2, CWND) -- rather than N/2, allowing high-priority streams to write as much as can be sent.) - If the stream is not the highest priority, try to place the data onto the reserved N/2 queue or fail. - When tick occurs *and* more packets can be scheduled: - Transfer packets from the high N/2 queue to the scheduled queue. - If more scheduling is allowed: - Call on_write callbacks for highest-priority streams, placing resulting packets directly onto the scheduled queue. - If more scheduling is allowed: - Transfer packets from the low N/2 queue to the scheduled queue. - If more scheduling is allowed: - Call on_write callbacks for non-highest-priority streams, placing resulting packets directly onto the scheduled queue The number N is currently 20, but it could be varied based on resource usage. - If stream is created due to incoming headers, make headers readable from on_new. - Outgoing packets are no longer marked non-writeable to prevent placing more than one STREAM frame from the same stream into a single packet. This property is maintained via code flow and an explicit check. Packets for stream data are allocated using a special function. - STREAM frame elision is cheaper, as we only perform it if a reset stream has outgoing packets referencing it. - lsquic_packet_out_t is smaller, as stream_rec elements are now inside a union.
446 lines
12 KiB
C
446 lines
12 KiB
C
/* Copyright (c) 2017 LiteSpeed Technologies Inc. See LICENSE. */
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#include <assert.h>
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#include <netinet/in.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/queue.h>
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#include <unistd.h>
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#include <event2/event.h>
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#include <lsquic.h>
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#include "../src/liblsquic/lsquic_hash.h"
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#include "../src/liblsquic/lsquic_logger.h"
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#include "test_config.h"
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#include "test_common.h"
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#include "prog.h"
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static int prog_stopped;
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static void
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prog_set_onetimer (struct prog *prog, unsigned usec);
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static const struct lsquic_packout_mem_if pmi = {
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.pmi_allocate = pba_allocate,
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.pmi_release = pba_release,
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};
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void
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prog_init (struct prog *prog, unsigned flags,
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struct sport_head *sports,
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const struct lsquic_stream_if *stream_if, void *stream_if_ctx)
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{
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/* prog-specific initialization: */
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memset(prog, 0, sizeof(*prog));
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prog->prog_engine_flags = flags;
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prog->prog_sports = sports;
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lsquic_engine_init_settings(&prog->prog_settings, flags);
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prog->prog_api.ea_settings = &prog->prog_settings;
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prog->prog_api.ea_stream_if = stream_if;
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prog->prog_api.ea_stream_if_ctx = stream_if_ctx;
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prog->prog_api.ea_packets_out = sport_packets_out;
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prog->prog_api.ea_packets_out_ctx
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= prog;
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prog->prog_api.ea_pmi = &pmi;
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prog->prog_api.ea_pmi_ctx = &prog->prog_pba;
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/* Non prog-specific initialization: */
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lsquic_global_init(flags & LSENG_SERVER ? LSQUIC_GLOBAL_SERVER :
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LSQUIC_GLOBAL_CLIENT);
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lsquic_log_to_fstream(stderr, LLTS_HHMMSSMS);
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lsquic_logger_lopt("=notice");
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}
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static int
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prog_add_sport (struct prog *prog, const char *arg)
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{
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struct service_port *sport;
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sport = sport_new(arg, prog);
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if (!sport)
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return -1;
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/* Default settings: */
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sport->sp_flags = prog->prog_dummy_sport.sp_flags;
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sport->sp_sndbuf = prog->prog_dummy_sport.sp_sndbuf;
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sport->sp_rcvbuf = prog->prog_dummy_sport.sp_rcvbuf;
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TAILQ_INSERT_TAIL(prog->prog_sports, sport, next_sport);
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return 0;
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}
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void
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prog_print_common_options (const struct prog *prog, FILE *out)
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{
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fprintf(out,
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" -s SVCPORT Service port. Takes on the form of IPv4:port or\n"
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" IPv6:port. For example:\n"
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" 127.0.0.1:12345\n"
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" ::1:12345\n"
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" If no -s option is given, 0.0.0.0:12345 address\n"
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" is used.\n"
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" -i USEC Library will `tick' every USEC microseconds. The default\n"
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" is %u\n"
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#if LSQUIC_DONTFRAG_SUPPORTED
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" -D Set `do not fragment' flag on outgoing UDP packets\n"
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#endif
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" -z BYTES Maximum size of outgoing UDP packets. The default is 1370\n"
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" bytes for IPv4 socket and 1350 bytes for IPv6 socket\n"
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" -L LEVEL Log level for all modules. Possible values are `debug',\n"
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" `info', `notice', `warn', `error', `alert', `emerg',\n"
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" and `crit'.\n"
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" -l LEVELS Log levels for modules, e.g.\n"
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" -l event=info,engine=debug\n"
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" Can be specified more than once.\n"
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" -m MAX Maximum number of outgoing packet buffers that can be\n"
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" assigned at any one time. By default, there is no max.\n"
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" -y style Timestamp style used in log messages. The following styles\n"
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" are supported:\n"
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" 0 No timestamp\n"
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" 1 Millisecond time (this is the default).\n"
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" Example: 11:04:05.196\n"
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" 2 Full date and millisecond time.\n"
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" Example: 2017-03-21 13:43:46.671\n"
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" 3 Chrome-like timestamp: date/time.microseconds.\n"
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" Example: 1223/104613.946956\n"
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" 4 Microsecond time.\n"
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" Example: 11:04:05.196308\n"
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" -S opt=val Socket options. Supported options:\n"
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" sndbuf=12345 # Sets SO_SNDBUF\n"
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" rcvbuf=12345 # Sets SO_RCVBUF\n"
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, PROG_DEFAULT_PERIOD_USEC
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);
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{
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if (prog->prog_engine_flags & LSENG_HTTP)
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fprintf(out,
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" -H host Value of `host' HTTP header. Defaults to `localhost'. This\n"
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" is also used as SNI.\n"
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);
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else
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fprintf(out,
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" -H host Value of SNI in CHLO.\n"
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);
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}
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fprintf(out,
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" -h Print this help screen and exit\n"
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);
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}
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int
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prog_set_opt (struct prog *prog, int opt, const char *arg)
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{
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switch (opt)
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{
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case 'i':
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prog->prog_period_usec = atoi(arg);
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return 0;
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#if LSQUIC_DONTFRAG_SUPPORTED
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case 'D':
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{
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struct service_port *sport = TAILQ_LAST(prog->prog_sports, sport_head);
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if (!sport)
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sport = &prog->prog_dummy_sport;
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sport->sp_flags |= SPORT_DONT_FRAGMENT;
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}
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return 0;
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#endif
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case 'm':
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prog->prog_packout_max = atoi(arg);
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return 0;
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case 'z':
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prog->prog_max_packet_size = atoi(arg);
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return 0;
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case 'H':
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if (prog->prog_engine_flags & LSENG_SERVER)
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return -1;
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prog->prog_hostname = arg;
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return 0;
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case 'y':
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lsquic_log_to_fstream(stderr, atoi(arg));
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return 0;
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case 'L':
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return lsquic_set_log_level(arg);
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case 'l':
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return lsquic_logger_lopt(arg);
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case 'o':
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return set_engine_option(&prog->prog_settings,
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&prog->prog_version_cleared, arg);
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case 's':
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if (0 == (prog->prog_engine_flags & LSENG_SERVER) &&
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!TAILQ_EMPTY(prog->prog_sports))
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return -1;
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return prog_add_sport(prog, arg);
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case 'S':
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{
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struct service_port *sport = TAILQ_LAST(prog->prog_sports, sport_head);
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if (!sport)
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sport = &prog->prog_dummy_sport;
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char *const name = strdup(optarg);
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char *val = strchr(name, '=');
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if (!val)
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{
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free(name);
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return -1;
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}
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*val = '\0';
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++val;
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if (0 == strcasecmp(name, "sndbuf"))
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{
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sport->sp_flags |= SPORT_SET_SNDBUF;
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sport->sp_sndbuf = atoi(val);
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free(name);
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return 0;
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}
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else if (0 == strcasecmp(name, "rcvbuf"))
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{
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sport->sp_flags |= SPORT_SET_RCVBUF;
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sport->sp_rcvbuf = atoi(val);
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free(name);
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return 0;
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}
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else
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{
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free(name);
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return -1;
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}
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}
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default:
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return 1;
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}
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}
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struct event_base *
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prog_eb (struct prog *prog)
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{
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return prog->prog_eb;
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}
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int
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prog_connect (struct prog *prog)
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{
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struct service_port *sport;
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sport = TAILQ_FIRST(prog->prog_sports);
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if (0 != lsquic_engine_connect(prog->prog_engine,
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(struct sockaddr *) &sport->sas, sport,
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prog->prog_hostname ? prog->prog_hostname : sport->host,
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prog->prog_max_packet_size))
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return -1;
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return 0;
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}
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static int
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prog_init_client (struct prog *prog)
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{
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struct service_port *sport;
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sport = TAILQ_FIRST(prog->prog_sports);
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if (0 != sport_init_client(sport, prog->prog_engine, prog->prog_eb))
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return -1;
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return 0;
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}
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static int
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prog_init_server (struct prog *prog)
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{
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struct service_port *sport;
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TAILQ_FOREACH(sport, prog->prog_sports, next_sport)
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if (0 != sport_init_server(sport, prog->prog_engine, prog->prog_eb))
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return -1;
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return 0;
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}
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static void
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drop_onetimer (struct prog *prog)
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{
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if (prog->prog_onetimer)
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{
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event_del(prog->prog_onetimer);
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event_free(prog->prog_onetimer);
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prog->prog_onetimer = NULL;
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}
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}
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void
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prog_maybe_set_onetimer (struct prog *prog)
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{
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int diff;
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if (lsquic_engine_earliest_adv_tick(prog->prog_engine, &diff))
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{
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if (diff > 0)
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prog_set_onetimer(prog, (unsigned) diff);
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}
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else
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drop_onetimer(prog);
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}
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static void
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prog_timer_handler (int fd, short what, void *arg)
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{
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struct prog *const prog = arg;
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lsquic_engine_proc_all(prog->prog_engine);
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prog_maybe_set_onetimer(prog);
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}
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static void
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prog_onetimer_handler (int fd, short what, void *arg)
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{
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struct prog *const prog = arg;
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lsquic_engine_process_conns_to_tick(prog->prog_engine);
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prog_maybe_set_onetimer(prog);
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}
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static void
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prog_set_onetimer (struct prog *prog, unsigned usec)
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{
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struct timeval timeout;
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drop_onetimer(prog);
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if (usec < 4000)
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usec = 4000;
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timeout.tv_sec = 0;
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timeout.tv_usec = usec;
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prog->prog_onetimer = event_new(prog->prog_eb, -1, EV_TIMEOUT,
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prog_onetimer_handler, prog);
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event_add(prog->prog_onetimer, &timeout);
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}
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static void
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prog_usr1_handler (int fd, short what, void *arg)
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{
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LSQ_NOTICE("Got SIGUSR1, stopping engine");
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prog_stop(arg);
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}
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int
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prog_run (struct prog *prog)
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{
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struct timeval timeout;
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timeout.tv_sec = 0;
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timeout.tv_usec = prog->prog_period_usec;
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prog->prog_timer = event_new(prog->prog_eb, -1, EV_PERSIST,
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prog_timer_handler, prog);
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event_add(prog->prog_timer, &timeout);
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prog->prog_usr1 = evsignal_new(prog->prog_eb, SIGUSR1,
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prog_usr1_handler, prog);
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evsignal_add(prog->prog_usr1, NULL);
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event_base_loop(prog->prog_eb, 0);
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return 0;
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}
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void
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prog_cleanup (struct prog *prog)
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{
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lsquic_engine_destroy(prog->prog_engine);
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event_base_free(prog->prog_eb);
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pba_cleanup(&prog->prog_pba);
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lsquic_global_cleanup();
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}
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void
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prog_stop (struct prog *prog)
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{
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struct service_port *sport;
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prog_stopped = 1;
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while ((sport = TAILQ_FIRST(prog->prog_sports)))
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{
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TAILQ_REMOVE(prog->prog_sports, sport, next_sport);
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sport_destroy(sport);
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}
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drop_onetimer(prog);
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event_del(prog->prog_timer);
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event_free(prog->prog_timer);
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prog->prog_timer = NULL;
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event_del(prog->prog_usr1);
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event_free(prog->prog_usr1);
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prog->prog_usr1 = NULL;
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}
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int
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prog_prep (struct prog *prog)
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{
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int s;
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char err_buf[100];
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if (0 == prog->prog_period_usec)
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prog->prog_period_usec = PROG_DEFAULT_PERIOD_USEC;
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if (prog->prog_settings.es_proc_time_thresh == LSQUIC_DF_PROC_TIME_THRESH)
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prog->prog_settings.es_proc_time_thresh = prog->prog_period_usec;
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if (0 != lsquic_engine_check_settings(prog->prog_api.ea_settings,
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prog->prog_engine_flags, err_buf, sizeof(err_buf)))
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{
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LSQ_ERROR("Error in settings: %s", err_buf);
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return -1;
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}
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pba_init(&prog->prog_pba, prog->prog_packout_max);
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if (TAILQ_EMPTY(prog->prog_sports))
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{
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s = prog_add_sport(prog, "0.0.0.0:12345");
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if (0 != s)
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return -1;
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}
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prog->prog_eb = event_base_new();
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prog->prog_engine = lsquic_engine_new(prog->prog_engine_flags,
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&prog->prog_api);
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if (!prog->prog_engine)
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return -1;
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if (prog->prog_engine_flags & LSENG_SERVER)
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s = prog_init_server(prog);
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else
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s = prog_init_client(prog);
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if (s != 0)
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return -1;
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return 0;
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}
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int
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prog_is_stopped (void)
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{
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return prog_stopped != 0;
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}
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