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#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_files.h>
#include <ngx_string.h>
#include <ngx_hunk.h>
#include <ngx_conf_file.h>
#include <ngx_http.h>
#include <ngx_http_config.h>
#include <ngx_http_output_filter.h>
static int ngx_http_output_filter_copy_hunk(ngx_hunk_t *dst, ngx_hunk_t *src);
static void *ngx_http_output_filter_create_conf(ngx_pool_t *pool);
static ngx_command_t ngx_http_output_filter_commands[] = {
{ngx_string("output_buffer"),
NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_HTTP_LOC_CONF,
offsetof(ngx_http_output_filter_conf_t, hunk_size)},
{ngx_string(""), 0, NULL, 0, 0}
};
static ngx_http_module_t ngx_http_output_filter_module_ctx = {
NGX_HTTP_MODULE,
NULL, /* create server config */
NULL, /* init server config */
ngx_http_output_filter_create_conf, /* create location config */
NULL, /* merge location config */
NULL, /* translate handler */
NULL, /* output header filter */
NULL, /* next output header filter */
(int (*)(ngx_http_request_t *, ngx_chain_t *))
ngx_http_output_filter, /* output body filter */
NULL /* next output body filter */
};
ngx_module_t ngx_http_output_filter_module = {
&ngx_http_output_filter_module_ctx, /* module context */
ngx_http_output_filter_commands, /* module directives */
NGX_HTTP_MODULE_TYPE, /* module type */
NULL /* init module */
};
int ngx_http_output_filter(ngx_http_request_t *r, ngx_hunk_t *hunk)
{
int rc, once;
size_t size;
ssize_t n;
ngx_chain_t *ce;
ngx_http_output_filter_ctx_t *ctx;
ngx_http_output_filter_conf_t *conf;
ctx = (ngx_http_output_filter_ctx_t *)
ngx_http_get_module_ctx(r->main ? r->main : r,
ngx_http_output_filter_module_ctx);
if (ctx == NULL) {
ngx_http_create_ctx(r, ctx,
ngx_http_output_filter_module_ctx,
sizeof(ngx_http_output_filter_ctx_t));
}
if (hunk && (hunk->type & NGX_HUNK_LAST)) {
ctx->last = 1;
}
for (once = 1; once || ctx->in; once = 0) {
/* input chain is not empty */
if (ctx->in) {
/* add hunk to input chain */
if (once && hunk) {
for (ce = ctx->in; ce->next; ce = ce->next) {
/* void */ ;
}
ngx_add_hunk_to_chain(ce->next, hunk, r->pool, NGX_ERROR);
}
/* our hunk is still busy */
if (ctx->hunk->pos.mem < ctx->hunk->last.mem) {
rc = ngx_http_output_filter_module_ctx.
next_output_body_filter(r, NULL);
/* our hunk is free */
} else {
ctx->out.hunk = ctx->hunk;
rc = ngx_http_output_filter_copy_hunk(ctx->hunk, ctx->in->hunk);
#if (NGX_FILE_AIO_READ)
if (rc == NGX_AGAIN) {
return rc;
}
#endif
if (rc == NGX_ERROR) {
return rc;
}
/* whole hunk is copied so we send to next filter chain part
up to next hunk that need to be copied */
if (ctx->in->hunk->pos.mem == ctx->in->hunk->last.mem) {
ctx->out.next = ctx->in->next;
for (ce = ctx->in->next; ce; ce = ce->next) {
if (ce->hunk->type & NGX_HUNK_FILE) {
break;
}
if ((ce->hunk->type & (NGX_HUNK_MEMORY|NGX_HUNK_MMAP))
&& (r->filter & NGX_HTTP_FILTER_NEED_TEMP))
{
break;
}
}
ctx->out.next = ce;
} else {
ctx->out.next = NULL;
}
rc = ngx_http_output_filter_module_ctx.
next_output_body_filter(r, &ctx->out);
}
/* delete completed hunks from input chain */
for (ce = ctx->in; ce; ce = ce->next) {
if (ce->hunk->pos.file == ce->hunk->last.file) {
ctx->in = ce->next;
}
}
if (rc == NGX_OK && ctx->hunk) {
ctx->hunk->pos.mem = ctx->hunk->last.mem = ctx->hunk->start;
} else {
return rc;
}
/* input chain is empty */
} else {
if (hunk == NULL) {
rc = ngx_http_output_filter_module_ctx.
next_output_body_filter(r, NULL);
} else {
/* we need to copy hunk to our hunk */
if (((r->filter & NGX_HTTP_FILTER_NEED_IN_MEMORY)
&& (hunk->type & NGX_HUNK_FILE))
|| ((r->filter & NGX_HTTP_FILTER_NEED_TEMP)
&& (hunk->type & (NGX_HUNK_MEMORY|NGX_HUNK_MMAP)))
) {
/* out hunk is still busy */
if (ctx->hunk && ctx->hunk->pos.mem < ctx->hunk->last.mem) {
ngx_add_hunk_to_chain(ctx->in, hunk, r->pool,
NGX_ERROR);
rc = ngx_http_output_filter_module_ctx.
next_output_body_filter(r, NULL);
} else {
if (ctx->hunk == NULL) {
if (hunk->type & NGX_HUNK_LAST) {
conf = (ngx_http_output_filter_conf_t *)
ngx_http_get_module_loc_conf(
r->main ? r->main : r,
ngx_http_output_filter_module_ctx);
size = hunk->last.mem - hunk->pos.mem;
if (size > conf->hunk_size) {
size = conf->hunk_size;
}
} else {
size = conf->hunk_size;
}
ngx_test_null(ctx->hunk,
ngx_create_temp_hunk(r->pool, size,
50, 50),
NGX_ERROR);
ctx->hunk->type |= NGX_HUNK_RECYCLED;
rc = ngx_http_output_filter_copy_hunk(ctx->hunk,
hunk);
#if (NGX_FILE_AIO_READ)
if (rc == NGX_AGAIN) {
/* add hunk to input chain */
ngx_add_hunk_to_chain(ctx->in, hunk, r->pool,
NGX_ERROR);
return rc;
}
#endif
if (rc == NGX_ERROR) {
return rc;
}
if (hunk->pos.mem < hunk->last.mem) {
ngx_add_hunk_to_chain(ctx->in, hunk, r->pool,
NGX_ERROR);
}
ctx->out.hunk = ctx->hunk;
ctx->out.next = NULL;
rc = ngx_http_output_filter_module_ctx.
next_output_body_filter(r, &ctx->out);
}
}
} else {
ctx->out.hunk = hunk;
ctx->out.next = NULL;
rc = ngx_http_output_filter_module_ctx.
next_output_body_filter(r, &ctx->out);
}
}
}
if (rc == NGX_OK && ctx->hunk)
ctx->hunk->pos.mem = ctx->hunk->last.mem = ctx->hunk->start;
}
if (rc == NGX_OK && ctx->last) {
return NGX_OK;
}
if (rc == NGX_OK) {
if (ctx->hunk) {
ctx->hunk->pos.mem = ctx->hunk->last.mem = ctx->hunk->start;
}
#if (!NGX_ONESHOT_EVENT)
ngx_del_event(r->connection->write, NGX_WRITE_EVENT);
#endif
}
return rc;
}
static int ngx_http_output_filter_copy_hunk(ngx_hunk_t *dst, ngx_hunk_t *src)
{
size_t size;
ssize_t n;
size = src->last.mem - src->pos.mem;
if (size > dst->end - dst->pos.mem) {
size = dst->end - dst->pos.mem;
}
if (src->type & NGX_HUNK_FILE) {
n = ngx_read_file(src->file, dst->pos.mem, size, src->pos.file);
if (n == NGX_ERROR) {
return n;
#if (NGX_FILE_AIO_READ)
} else if (n == NGX_AGAIN) {
return n;
#endif
} else {
ngx_assert((n == size), /* void */ ; , src->file->log,
ngx_read_file_n " reads only %d of %d" _
n _ size);
}
src->pos.mem += n;
dst->last.mem += n;
} else {
ngx_memcpy(src->pos.mem, dst->pos.mem, size);
src->pos.mem += size;
dst->last.mem += size;
}
if (src->type & NGX_HUNK_LAST) {
dst->type |= NGX_HUNK_LAST;
}
return NGX_OK;
}
static void *ngx_http_output_filter_create_conf(ngx_pool_t *pool)
{
ngx_http_output_filter_conf_t *conf;
ngx_test_null(conf,
ngx_pcalloc(pool, sizeof(ngx_http_output_filter_conf_t)),
NULL);
conf->hunk_size = NGX_CONF_UNSET;
return conf;
}
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