Mercurial > hg > nginx
view src/event/ngx_event_pipe.c @ 8466:4fd709540daf quic
HTTP/3: put ngx_http_v3_parse_varlen_int() return code in variable.
This makes calling this function similar to other parse functions.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Fri, 03 Jul 2020 12:07:43 +0300 |
parents | afceb32f3a8a |
children | bffcc5af1d72 |
line wrap: on
line source
/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> #include <ngx_event_pipe.h> static ngx_int_t ngx_event_pipe_read_upstream(ngx_event_pipe_t *p); static ngx_int_t ngx_event_pipe_write_to_downstream(ngx_event_pipe_t *p); static ngx_int_t ngx_event_pipe_write_chain_to_temp_file(ngx_event_pipe_t *p); static ngx_inline void ngx_event_pipe_remove_shadow_links(ngx_buf_t *buf); static ngx_int_t ngx_event_pipe_drain_chains(ngx_event_pipe_t *p); ngx_int_t ngx_event_pipe(ngx_event_pipe_t *p, ngx_int_t do_write) { ngx_int_t rc; ngx_uint_t flags; ngx_event_t *rev, *wev; for ( ;; ) { if (do_write) { p->log->action = "sending to client"; rc = ngx_event_pipe_write_to_downstream(p); if (rc == NGX_ABORT) { return NGX_ABORT; } if (rc == NGX_BUSY) { return NGX_OK; } } p->read = 0; p->upstream_blocked = 0; p->log->action = "reading upstream"; if (ngx_event_pipe_read_upstream(p) == NGX_ABORT) { return NGX_ABORT; } if (!p->read && !p->upstream_blocked) { break; } do_write = 1; } if (p->upstream->fd != (ngx_socket_t) -1) { rev = p->upstream->read; flags = (rev->eof || rev->error) ? NGX_CLOSE_EVENT : 0; if (ngx_handle_read_event(rev, flags) != NGX_OK) { return NGX_ABORT; } if (!rev->delayed) { if (rev->active && !rev->ready) { ngx_add_timer(rev, p->read_timeout); } else if (rev->timer_set) { ngx_del_timer(rev); } } } if (p->downstream->fd != (ngx_socket_t) -1 && p->downstream->data == p->output_ctx) { wev = p->downstream->write; if (ngx_handle_write_event(wev, p->send_lowat) != NGX_OK) { return NGX_ABORT; } if (!wev->delayed) { if (wev->active && !wev->ready) { ngx_add_timer(wev, p->send_timeout); } else if (wev->timer_set) { ngx_del_timer(wev); } } } return NGX_OK; } static ngx_int_t ngx_event_pipe_read_upstream(ngx_event_pipe_t *p) { off_t limit; ssize_t n, size; ngx_int_t rc; ngx_buf_t *b; ngx_msec_t delay; ngx_chain_t *chain, *cl, *ln; if (p->upstream_eof || p->upstream_error || p->upstream_done) { return NGX_OK; } #if (NGX_THREADS) if (p->aio) { ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe read upstream: aio"); return NGX_AGAIN; } if (p->writing) { ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe read upstream: writing"); rc = ngx_event_pipe_write_chain_to_temp_file(p); if (rc != NGX_OK) { return rc; } } #endif ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe read upstream: %d", p->upstream->read->ready); for ( ;; ) { if (p->upstream_eof || p->upstream_error || p->upstream_done) { break; } if (p->preread_bufs == NULL && !p->upstream->read->ready) { break; } if (p->preread_bufs) { /* use the pre-read bufs if they exist */ chain = p->preread_bufs; p->preread_bufs = NULL; n = p->preread_size; ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe preread: %z", n); if (n) { p->read = 1; } } else { #if (NGX_HAVE_KQUEUE) /* * kqueue notifies about the end of file or a pending error. * This test allows not to allocate a buf on these conditions * and not to call c->recv_chain(). */ if (p->upstream->read->available == 0 && p->upstream->read->pending_eof #if (NGX_SSL) && !p->upstream->ssl #endif ) { p->upstream->read->ready = 0; p->upstream->read->eof = 1; p->upstream_eof = 1; p->read = 1; if (p->upstream->read->kq_errno) { p->upstream->read->error = 1; p->upstream_error = 1; p->upstream_eof = 0; ngx_log_error(NGX_LOG_ERR, p->log, p->upstream->read->kq_errno, "kevent() reported that upstream " "closed connection"); } break; } #endif if (p->limit_rate) { if (p->upstream->read->delayed) { break; } limit = (off_t) p->limit_rate * (ngx_time() - p->start_sec + 1) - p->read_length; if (limit <= 0) { p->upstream->read->delayed = 1; delay = (ngx_msec_t) (- limit * 1000 / p->limit_rate + 1); ngx_add_timer(p->upstream->read, delay); break; } } else { limit = 0; } if (p->free_raw_bufs) { /* use the free bufs if they exist */ chain = p->free_raw_bufs; if (p->single_buf) { p->free_raw_bufs = p->free_raw_bufs->next; chain->next = NULL; } else { p->free_raw_bufs = NULL; } } else if (p->allocated < p->bufs.num) { /* allocate a new buf if it's still allowed */ b = ngx_create_temp_buf(p->pool, p->bufs.size); if (b == NULL) { return NGX_ABORT; } p->allocated++; chain = ngx_alloc_chain_link(p->pool); if (chain == NULL) { return NGX_ABORT; } chain->buf = b; chain->next = NULL; } else if (!p->cacheable && p->downstream->data == p->output_ctx && p->downstream->write->ready && !p->downstream->write->delayed) { /* * if the bufs are not needed to be saved in a cache and * a downstream is ready then write the bufs to a downstream */ p->upstream_blocked = 1; ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe downstream ready"); break; } else if (p->cacheable || p->temp_file->offset < p->max_temp_file_size) { /* * if it is allowed, then save some bufs from p->in * to a temporary file, and add them to a p->out chain */ rc = ngx_event_pipe_write_chain_to_temp_file(p); ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe temp offset: %O", p->temp_file->offset); if (rc == NGX_BUSY) { break; } if (rc != NGX_OK) { return rc; } chain = p->free_raw_bufs; if (p->single_buf) { p->free_raw_bufs = p->free_raw_bufs->next; chain->next = NULL; } else { p->free_raw_bufs = NULL; } } else { /* there are no bufs to read in */ ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0, "no pipe bufs to read in"); break; } n = p->upstream->recv_chain(p->upstream, chain, limit); ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe recv chain: %z", n); if (p->free_raw_bufs) { chain->next = p->free_raw_bufs; } p->free_raw_bufs = chain; if (n == NGX_ERROR) { p->upstream_error = 1; break; } if (n == NGX_AGAIN) { if (p->single_buf) { ngx_event_pipe_remove_shadow_links(chain->buf); } break; } p->read = 1; if (n == 0) { p->upstream_eof = 1; break; } } delay = p->limit_rate ? (ngx_msec_t) n * 1000 / p->limit_rate : 0; p->read_length += n; cl = chain; p->free_raw_bufs = NULL; while (cl && n > 0) { ngx_event_pipe_remove_shadow_links(cl->buf); size = cl->buf->end - cl->buf->last; if (n >= size) { cl->buf->last = cl->buf->end; /* STUB */ cl->buf->num = p->num++; if (p->input_filter(p, cl->buf) == NGX_ERROR) { return NGX_ABORT; } n -= size; ln = cl; cl = cl->next; ngx_free_chain(p->pool, ln); } else { cl->buf->last += n; n = 0; } } if (cl) { for (ln = cl; ln->next; ln = ln->next) { /* void */ } ln->next = p->free_raw_bufs; p->free_raw_bufs = cl; } if (delay > 0) { p->upstream->read->delayed = 1; ngx_add_timer(p->upstream->read, delay); break; } } #if (NGX_DEBUG) for (cl = p->busy; cl; cl = cl->next) { ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe buf busy s:%d t:%d f:%d " "%p, pos %p, size: %z " "file: %O, size: %O", (cl->buf->shadow ? 1 : 0), cl->buf->temporary, cl->buf->in_file, cl->buf->start, cl->buf->pos, cl->buf->last - cl->buf->pos, cl->buf->file_pos, cl->buf->file_last - cl->buf->file_pos); } for (cl = p->out; cl; cl = cl->next) { ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe buf out s:%d t:%d f:%d " "%p, pos %p, size: %z " "file: %O, size: %O", (cl->buf->shadow ? 1 : 0), cl->buf->temporary, cl->buf->in_file, cl->buf->start, cl->buf->pos, cl->buf->last - cl->buf->pos, cl->buf->file_pos, cl->buf->file_last - cl->buf->file_pos); } for (cl = p->in; cl; cl = cl->next) { ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe buf in s:%d t:%d f:%d " "%p, pos %p, size: %z " "file: %O, size: %O", (cl->buf->shadow ? 1 : 0), cl->buf->temporary, cl->buf->in_file, cl->buf->start, cl->buf->pos, cl->buf->last - cl->buf->pos, cl->buf->file_pos, cl->buf->file_last - cl->buf->file_pos); } for (cl = p->free_raw_bufs; cl; cl = cl->next) { ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe buf free s:%d t:%d f:%d " "%p, pos %p, size: %z " "file: %O, size: %O", (cl->buf->shadow ? 1 : 0), cl->buf->temporary, cl->buf->in_file, cl->buf->start, cl->buf->pos, cl->buf->last - cl->buf->pos, cl->buf->file_pos, cl->buf->file_last - cl->buf->file_pos); } ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe length: %O", p->length); #endif if (p->free_raw_bufs && p->length != -1) { cl = p->free_raw_bufs; if (cl->buf->last - cl->buf->pos >= p->length) { p->free_raw_bufs = cl->next; /* STUB */ cl->buf->num = p->num++; if (p->input_filter(p, cl->buf) == NGX_ERROR) { return NGX_ABORT; } ngx_free_chain(p->pool, cl); } } if (p->length == 0) { p->upstream_done = 1; p->read = 1; } if ((p->upstream_eof || p->upstream_error) && p->free_raw_bufs) { /* STUB */ p->free_raw_bufs->buf->num = p->num++; if (p->input_filter(p, p->free_raw_bufs->buf) == NGX_ERROR) { return NGX_ABORT; } p->free_raw_bufs = p->free_raw_bufs->next; if (p->free_bufs && p->buf_to_file == NULL) { for (cl = p->free_raw_bufs; cl; cl = cl->next) { if (cl->buf->shadow == NULL) { ngx_pfree(p->pool, cl->buf->start); } } } } if (p->cacheable && (p->in || p->buf_to_file)) { ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe write chain"); rc = ngx_event_pipe_write_chain_to_temp_file(p); if (rc != NGX_OK) { return rc; } } return NGX_OK; } static ngx_int_t ngx_event_pipe_write_to_downstream(ngx_event_pipe_t *p) { u_char *prev; size_t bsize; ngx_int_t rc; ngx_uint_t flush, flushed, prev_last_shadow; ngx_chain_t *out, **ll, *cl; ngx_connection_t *downstream; downstream = p->downstream; ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe write downstream: %d", downstream->write->ready); #if (NGX_THREADS) if (p->writing) { rc = ngx_event_pipe_write_chain_to_temp_file(p); if (rc == NGX_ABORT) { return NGX_ABORT; } } #endif flushed = 0; for ( ;; ) { if (p->downstream_error) { return ngx_event_pipe_drain_chains(p); } if (p->upstream_eof || p->upstream_error || p->upstream_done) { /* pass the p->out and p->in chains to the output filter */ for (cl = p->busy; cl; cl = cl->next) { cl->buf->recycled = 0; } if (p->out) { ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe write downstream flush out"); for (cl = p->out; cl; cl = cl->next) { cl->buf->recycled = 0; } rc = p->output_filter(p->output_ctx, p->out); if (rc == NGX_ERROR) { p->downstream_error = 1; return ngx_event_pipe_drain_chains(p); } p->out = NULL; } if (p->writing) { break; } if (p->in) { ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe write downstream flush in"); for (cl = p->in; cl; cl = cl->next) { cl->buf->recycled = 0; } rc = p->output_filter(p->output_ctx, p->in); if (rc == NGX_ERROR) { p->downstream_error = 1; return ngx_event_pipe_drain_chains(p); } p->in = NULL; } ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe write downstream done"); /* TODO: free unused bufs */ p->downstream_done = 1; break; } if (downstream->data != p->output_ctx || !downstream->write->ready || downstream->write->delayed) { break; } /* bsize is the size of the busy recycled bufs */ prev = NULL; bsize = 0; for (cl = p->busy; cl; cl = cl->next) { if (cl->buf->recycled) { if (prev == cl->buf->start) { continue; } bsize += cl->buf->end - cl->buf->start; prev = cl->buf->start; } } ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe write busy: %uz", bsize); out = NULL; if (bsize >= (size_t) p->busy_size) { flush = 1; goto flush; } flush = 0; ll = NULL; prev_last_shadow = 1; for ( ;; ) { if (p->out) { cl = p->out; if (cl->buf->recycled) { ngx_log_error(NGX_LOG_ALERT, p->log, 0, "recycled buffer in pipe out chain"); } p->out = p->out->next; } else if (!p->cacheable && !p->writing && p->in) { cl = p->in; ngx_log_debug3(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe write buf ls:%d %p %z", cl->buf->last_shadow, cl->buf->pos, cl->buf->last - cl->buf->pos); if (cl->buf->recycled && prev_last_shadow) { if (bsize + cl->buf->end - cl->buf->start > p->busy_size) { flush = 1; break; } bsize += cl->buf->end - cl->buf->start; } prev_last_shadow = cl->buf->last_shadow; p->in = p->in->next; } else { break; } cl->next = NULL; if (out) { *ll = cl; } else { out = cl; } ll = &cl->next; } flush: ngx_log_debug2(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe write: out:%p, f:%ui", out, flush); if (out == NULL) { if (!flush) { break; } /* a workaround for AIO */ if (flushed++ > 10) { return NGX_BUSY; } } rc = p->output_filter(p->output_ctx, out); ngx_chain_update_chains(p->pool, &p->free, &p->busy, &out, p->tag); if (rc == NGX_ERROR) { p->downstream_error = 1; return ngx_event_pipe_drain_chains(p); } for (cl = p->free; cl; cl = cl->next) { if (cl->buf->temp_file) { if (p->cacheable || !p->cyclic_temp_file) { continue; } /* reset p->temp_offset if all bufs had been sent */ if (cl->buf->file_last == p->temp_file->offset) { p->temp_file->offset = 0; } } /* TODO: free buf if p->free_bufs && upstream done */ /* add the free shadow raw buf to p->free_raw_bufs */ if (cl->buf->last_shadow) { if (ngx_event_pipe_add_free_buf(p, cl->buf->shadow) != NGX_OK) { return NGX_ABORT; } cl->buf->last_shadow = 0; } cl->buf->shadow = NULL; } } return NGX_OK; } static ngx_int_t ngx_event_pipe_write_chain_to_temp_file(ngx_event_pipe_t *p) { ssize_t size, bsize, n; ngx_buf_t *b; ngx_uint_t prev_last_shadow; ngx_chain_t *cl, *tl, *next, *out, **ll, **last_out, **last_free; #if (NGX_THREADS) if (p->writing) { if (p->aio) { return NGX_AGAIN; } out = p->writing; p->writing = NULL; n = ngx_write_chain_to_temp_file(p->temp_file, NULL); if (n == NGX_ERROR) { return NGX_ABORT; } goto done; } #endif if (p->buf_to_file) { out = ngx_alloc_chain_link(p->pool); if (out == NULL) { return NGX_ABORT; } out->buf = p->buf_to_file; out->next = p->in; } else { out = p->in; } if (!p->cacheable) { size = 0; cl = out; ll = NULL; prev_last_shadow = 1; ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe offset: %O", p->temp_file->offset); do { bsize = cl->buf->last - cl->buf->pos; ngx_log_debug4(NGX_LOG_DEBUG_EVENT, p->log, 0, "pipe buf ls:%d %p, pos %p, size: %z", cl->buf->last_shadow, cl->buf->start, cl->buf->pos, bsize); if (prev_last_shadow && ((size + bsize > p->temp_file_write_size) || (p->temp_file->offset + size + bsize > p->max_temp_file_size))) { break; } prev_last_shadow = cl->buf->last_shadow; size += bsize; ll = &cl->next; cl = cl->next; } while (cl); ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "size: %z", size); if (ll == NULL) { return NGX_BUSY; } if (cl) { p->in = cl; *ll = NULL; } else { p->in = NULL; p->last_in = &p->in; } } else { p->in = NULL; p->last_in = &p->in; } #if (NGX_THREADS) if (p->thread_handler) { p->temp_file->thread_write = 1; p->temp_file->file.thread_task = p->thread_task; p->temp_file->file.thread_handler = p->thread_handler; p->temp_file->file.thread_ctx = p->thread_ctx; } #endif n = ngx_write_chain_to_temp_file(p->temp_file, out); if (n == NGX_ERROR) { return NGX_ABORT; } #if (NGX_THREADS) if (n == NGX_AGAIN) { p->writing = out; p->thread_task = p->temp_file->file.thread_task; return NGX_AGAIN; } done: #endif if (p->buf_to_file) { p->temp_file->offset = p->buf_to_file->last - p->buf_to_file->pos; n -= p->buf_to_file->last - p->buf_to_file->pos; p->buf_to_file = NULL; out = out->next; } if (n > 0) { /* update previous buffer or add new buffer */ if (p->out) { for (cl = p->out; cl->next; cl = cl->next) { /* void */ } b = cl->buf; if (b->file_last == p->temp_file->offset) { p->temp_file->offset += n; b->file_last = p->temp_file->offset; goto free; } last_out = &cl->next; } else { last_out = &p->out; } cl = ngx_chain_get_free_buf(p->pool, &p->free); if (cl == NULL) { return NGX_ABORT; } b = cl->buf; ngx_memzero(b, sizeof(ngx_buf_t)); b->tag = p->tag; b->file = &p->temp_file->file; b->file_pos = p->temp_file->offset; p->temp_file->offset += n; b->file_last = p->temp_file->offset; b->in_file = 1; b->temp_file = 1; *last_out = cl; } free: for (last_free = &p->free_raw_bufs; *last_free != NULL; last_free = &(*last_free)->next) { /* void */ } for (cl = out; cl; cl = next) { next = cl->next; cl->next = p->free; p->free = cl; b = cl->buf; if (b->last_shadow) { tl = ngx_alloc_chain_link(p->pool); if (tl == NULL) { return NGX_ABORT; } tl->buf = b->shadow; tl->next = NULL; *last_free = tl; last_free = &tl->next; b->shadow->pos = b->shadow->start; b->shadow->last = b->shadow->start; ngx_event_pipe_remove_shadow_links(b->shadow); } } return NGX_OK; } /* the copy input filter */ ngx_int_t ngx_event_pipe_copy_input_filter(ngx_event_pipe_t *p, ngx_buf_t *buf) { ngx_buf_t *b; ngx_chain_t *cl; if (buf->pos == buf->last) { return NGX_OK; } cl = ngx_chain_get_free_buf(p->pool, &p->free); if (cl == NULL) { return NGX_ERROR; } b = cl->buf; ngx_memcpy(b, buf, sizeof(ngx_buf_t)); b->shadow = buf; b->tag = p->tag; b->last_shadow = 1; b->recycled = 1; buf->shadow = b; ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "input buf #%d", b->num); if (p->in) { *p->last_in = cl; } else { p->in = cl; } p->last_in = &cl->next; if (p->length == -1) { return NGX_OK; } p->length -= b->last - b->pos; return NGX_OK; } static ngx_inline void ngx_event_pipe_remove_shadow_links(ngx_buf_t *buf) { ngx_buf_t *b, *next; b = buf->shadow; if (b == NULL) { return; } while (!b->last_shadow) { next = b->shadow; b->temporary = 0; b->recycled = 0; b->shadow = NULL; b = next; } b->temporary = 0; b->recycled = 0; b->last_shadow = 0; b->shadow = NULL; buf->shadow = NULL; } ngx_int_t ngx_event_pipe_add_free_buf(ngx_event_pipe_t *p, ngx_buf_t *b) { ngx_chain_t *cl; cl = ngx_alloc_chain_link(p->pool); if (cl == NULL) { return NGX_ERROR; } if (p->buf_to_file && b->start == p->buf_to_file->start) { b->pos = p->buf_to_file->last; b->last = p->buf_to_file->last; } else { b->pos = b->start; b->last = b->start; } b->shadow = NULL; cl->buf = b; if (p->free_raw_bufs == NULL) { p->free_raw_bufs = cl; cl->next = NULL; return NGX_OK; } if (p->free_raw_bufs->buf->pos == p->free_raw_bufs->buf->last) { /* add the free buf to the list start */ cl->next = p->free_raw_bufs; p->free_raw_bufs = cl; return NGX_OK; } /* the first free buf is partially filled, thus add the free buf after it */ cl->next = p->free_raw_bufs->next; p->free_raw_bufs->next = cl; return NGX_OK; } static ngx_int_t ngx_event_pipe_drain_chains(ngx_event_pipe_t *p) { ngx_chain_t *cl, *tl; for ( ;; ) { if (p->busy) { cl = p->busy; p->busy = NULL; } else if (p->out) { cl = p->out; p->out = NULL; } else if (p->in) { cl = p->in; p->in = NULL; } else { return NGX_OK; } while (cl) { if (cl->buf->last_shadow) { if (ngx_event_pipe_add_free_buf(p, cl->buf->shadow) != NGX_OK) { return NGX_ABORT; } cl->buf->last_shadow = 0; } cl->buf->shadow = NULL; tl = cl->next; cl->next = p->free; p->free = cl; cl = tl; } } }