diff options
Diffstat (limited to 'app/nginx/src/stream/ngx_stream_write_filter_module.c')
| -rw-r--r-- | app/nginx/src/stream/ngx_stream_write_filter_module.c | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/app/nginx/src/stream/ngx_stream_write_filter_module.c b/app/nginx/src/stream/ngx_stream_write_filter_module.c new file mode 100644 index 0000000..8fdcd37 --- /dev/null +++ b/app/nginx/src/stream/ngx_stream_write_filter_module.c @@ -0,0 +1,273 @@ + +/* + * Copyright (C) Igor Sysoev + * Copyright (C) Nginx, Inc. + */ + + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_stream.h> + + +typedef struct { + ngx_chain_t *from_upstream; + ngx_chain_t *from_downstream; +} ngx_stream_write_filter_ctx_t; + + +static ngx_int_t ngx_stream_write_filter(ngx_stream_session_t *s, + ngx_chain_t *in, ngx_uint_t from_upstream); +static ngx_int_t ngx_stream_write_filter_init(ngx_conf_t *cf); + + +static ngx_stream_module_t ngx_stream_write_filter_module_ctx = { + NULL, /* preconfiguration */ + ngx_stream_write_filter_init, /* postconfiguration */ + + NULL, /* create main configuration */ + NULL, /* init main configuration */ + + NULL, /* create server configuration */ + NULL /* merge server configuration */ +}; + + +ngx_module_t ngx_stream_write_filter_module = { + NGX_MODULE_V1, + &ngx_stream_write_filter_module_ctx, /* module context */ + NULL, /* module directives */ + NGX_STREAM_MODULE, /* module type */ + NULL, /* init master */ + NULL, /* init module */ + NULL, /* init process */ + NULL, /* init thread */ + NULL, /* exit thread */ + NULL, /* exit process */ + NULL, /* exit master */ + NGX_MODULE_V1_PADDING +}; + + +static ngx_int_t +ngx_stream_write_filter(ngx_stream_session_t *s, ngx_chain_t *in, + ngx_uint_t from_upstream) +{ + off_t size; + ngx_uint_t last, flush, sync; + ngx_chain_t *cl, *ln, **ll, **out, *chain; + ngx_connection_t *c; + ngx_stream_write_filter_ctx_t *ctx; + + ctx = ngx_stream_get_module_ctx(s, ngx_stream_write_filter_module); + + if (ctx == NULL) { + ctx = ngx_pcalloc(s->connection->pool, + sizeof(ngx_stream_write_filter_ctx_t)); + if (ctx == NULL) { + return NGX_ERROR; + } + + ngx_stream_set_ctx(s, ctx, ngx_stream_write_filter_module); + } + + if (from_upstream) { + c = s->connection; + out = &ctx->from_upstream; + + } else { + c = s->upstream->peer.connection; + out = &ctx->from_downstream; + } + + if (c->error) { + return NGX_ERROR; + } + + size = 0; + flush = 0; + sync = 0; + last = 0; + ll = out; + + /* find the size, the flush point and the last link of the saved chain */ + + for (cl = *out; cl; cl = cl->next) { + ll = &cl->next; + + ngx_log_debug7(NGX_LOG_DEBUG_EVENT, c->log, 0, + "write old buf t:%d f:%d %p, pos %p, size: %z " + "file: %O, size: %O", + 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); + +#if 1 + if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) { + ngx_log_error(NGX_LOG_ALERT, c->log, 0, + "zero size buf in writer " + "t:%d r:%d f:%d %p %p-%p %p %O-%O", + cl->buf->temporary, + cl->buf->recycled, + cl->buf->in_file, + cl->buf->start, + cl->buf->pos, + cl->buf->last, + cl->buf->file, + cl->buf->file_pos, + cl->buf->file_last); + + ngx_debug_point(); + return NGX_ERROR; + } +#endif + + size += ngx_buf_size(cl->buf); + + if (cl->buf->flush || cl->buf->recycled) { + flush = 1; + } + + if (cl->buf->sync) { + sync = 1; + } + + if (cl->buf->last_buf) { + last = 1; + } + } + + /* add the new chain to the existent one */ + + for (ln = in; ln; ln = ln->next) { + cl = ngx_alloc_chain_link(c->pool); + if (cl == NULL) { + return NGX_ERROR; + } + + cl->buf = ln->buf; + *ll = cl; + ll = &cl->next; + + ngx_log_debug7(NGX_LOG_DEBUG_EVENT, c->log, 0, + "write new buf t:%d f:%d %p, pos %p, size: %z " + "file: %O, size: %O", + 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); + +#if 1 + if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) { + ngx_log_error(NGX_LOG_ALERT, c->log, 0, + "zero size buf in writer " + "t:%d r:%d f:%d %p %p-%p %p %O-%O", + cl->buf->temporary, + cl->buf->recycled, + cl->buf->in_file, + cl->buf->start, + cl->buf->pos, + cl->buf->last, + cl->buf->file, + cl->buf->file_pos, + cl->buf->file_last); + + ngx_debug_point(); + return NGX_ERROR; + } +#endif + + size += ngx_buf_size(cl->buf); + + if (cl->buf->flush || cl->buf->recycled) { + flush = 1; + } + + if (cl->buf->sync) { + sync = 1; + } + + if (cl->buf->last_buf) { + last = 1; + } + } + + *ll = NULL; + + ngx_log_debug3(NGX_LOG_DEBUG_STREAM, c->log, 0, + "stream write filter: l:%ui f:%ui s:%O", last, flush, size); + + if (size == 0 + && !(c->buffered & NGX_LOWLEVEL_BUFFERED) + && !(last && c->need_last_buf)) + { + if (last || flush || sync) { + for (cl = *out; cl; /* void */) { + ln = cl; + cl = cl->next; + ngx_free_chain(c->pool, ln); + } + + *out = NULL; + c->buffered &= ~NGX_STREAM_WRITE_BUFFERED; + + return NGX_OK; + } + + ngx_log_error(NGX_LOG_ALERT, c->log, 0, + "the stream output chain is empty"); + + ngx_debug_point(); + + return NGX_ERROR; + } + + chain = c->send_chain(c, *out, 0); + + ngx_log_debug1(NGX_LOG_DEBUG_STREAM, c->log, 0, + "stream write filter %p", chain); + + if (chain == NGX_CHAIN_ERROR) { + c->error = 1; + return NGX_ERROR; + } + + for (cl = *out; cl && cl != chain; /* void */) { + ln = cl; + cl = cl->next; + ngx_free_chain(c->pool, ln); + } + + *out = chain; + + if (chain) { + if (c->shared) { + ngx_log_error(NGX_LOG_ALERT, c->log, 0, + "shared connection is busy"); + return NGX_ERROR; + } + + c->buffered |= NGX_STREAM_WRITE_BUFFERED; + return NGX_AGAIN; + } + + c->buffered &= ~NGX_STREAM_WRITE_BUFFERED; + + if (c->buffered & NGX_LOWLEVEL_BUFFERED) { + return NGX_AGAIN; + } + + return NGX_OK; +} + + +static ngx_int_t +ngx_stream_write_filter_init(ngx_conf_t *cf) +{ + ngx_stream_top_filter = ngx_stream_write_filter; + + return NGX_OK; +} |