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#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_http.h>
typedef struct {
ssize_t buffer_output;
} ngx_http_write_filter_conf_t;
typedef struct {
ngx_chain_t *out;
} ngx_http_write_filter_ctx_t;
static void *ngx_http_write_filter_create_conf(ngx_conf_t *cf);
static char *ngx_http_write_filter_merge_conf(ngx_conf_t *cf,
void *parent, void *child);
static int ngx_http_write_filter_init(ngx_cycle_t *cycle);
static ngx_command_t ngx_http_write_filter_commands[] = {
{ngx_string("buffer_output"),
NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_write_filter_conf_t, buffer_output),
NULL},
ngx_null_command
};
ngx_http_module_t ngx_http_write_filter_module_ctx = {
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_write_filter_create_conf, /* create location configuration */
ngx_http_write_filter_merge_conf /* merge location configuration */
};
ngx_module_t ngx_http_write_filter_module = {
NGX_MODULE,
&ngx_http_write_filter_module_ctx, /* module context */
ngx_http_write_filter_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
ngx_http_write_filter_init, /* init module */
NULL /* init child */
};
int ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *in)
{
int last;
off_t size, flush;
ngx_chain_t *cl, **ll, *chain;
ngx_http_write_filter_ctx_t *ctx;
ngx_http_write_filter_conf_t *conf;
ctx = ngx_http_get_module_ctx(r->main ? r->main : r,
ngx_http_write_filter_module);
if (ctx == NULL) {
ngx_http_create_ctx(r, ctx, ngx_http_write_filter_module,
sizeof(ngx_http_write_filter_ctx_t), NGX_ERROR);
}
size = flush = 0;
last = 0;
ll = &ctx->out;
/* find the size, the flush point and the last link of the saved chain */
for (cl = ctx->out; cl; cl = cl->next) {
ll = &cl->next;
size += ngx_hunk_size(cl->hunk);
if (cl->hunk->type & (NGX_HUNK_FLUSH|NGX_HUNK_RECYCLED)) {
flush = size;
}
if (cl->hunk->type & NGX_HUNK_LAST) {
last = 1;
}
}
/* add the new chain to the existent one */
for (/* void */; in; in = in->next) {
ngx_alloc_link_and_set_hunk(cl, in->hunk, r->pool, NGX_ERROR);
*ll = cl;
ll = &cl->next;
size += ngx_hunk_size(cl->hunk);
if (cl->hunk->type & (NGX_HUNK_FLUSH|NGX_HUNK_RECYCLED)) {
flush = size;
}
if (cl->hunk->type & NGX_HUNK_LAST) {
last = 1;
}
}
#if (NGX_DEBUG_WRITE_FILTER)
ngx_log_debug(r->connection->log,
"write filter: last:%d flush:%qd size:%qd" _
last _ flush _ size);
#endif
conf = ngx_http_get_module_loc_conf(r->main ? r->main : r,
ngx_http_write_filter_module);
/*
* avoid the output if there is no last hunk, no flush point and
* the size of the hunks is smaller than "buffer_output" directive
*/
if (!last && flush == 0 && size < conf->buffer_output) {
return NGX_OK;
}
if (r->connection->write->delayed) {
return NGX_AGAIN;
}
if (size == 0) {
return NGX_OK;
}
chain = ngx_write_chain(r->connection, ctx->out);
#if (NGX_DEBUG_WRITE_FILTER)
ngx_log_debug(r->connection->log, "write filter %x" _ chain);
#endif
if (chain == NGX_CHAIN_ERROR) {
return NGX_ERROR;
}
ctx->out = chain;
if (chain == NULL) {
return NGX_OK;
}
return NGX_AGAIN;
}
static void *ngx_http_write_filter_create_conf(ngx_conf_t *cf)
{
ngx_http_write_filter_conf_t *conf;
ngx_test_null(conf,
ngx_palloc(cf->pool, sizeof(ngx_http_write_filter_conf_t)),
NULL);
conf->buffer_output = NGX_CONF_UNSET;
return conf;
}
static char *ngx_http_write_filter_merge_conf(ngx_conf_t *cf,
void *parent, void *child)
{
ngx_http_write_filter_conf_t *prev = parent;
ngx_http_write_filter_conf_t *conf = child;
ngx_conf_merge_size_value(conf->buffer_output, prev->buffer_output, 1460);
return NULL;
}
static int ngx_http_write_filter_init(ngx_cycle_t *cycle)
{
ngx_http_top_body_filter = ngx_http_write_filter;
return NGX_OK;
}
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