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#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <ngx_http_proxy_handler.h>
int ngx_http_proxy_get_cached_response(ngx_http_proxy_ctx_t *p)
{
int rc;
char *last;
ngx_http_request_t *r;
ngx_http_proxy_cache_t *c;
ngx_http_proxy_upstream_t *u;
r = p->request;
if (!(c = ngx_pcalloc(r->pool, sizeof(ngx_http_proxy_cache_t)))) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
c->ctx.file.fd = NGX_INVALID_FILE;
c->ctx.file.log = r->connection->log;
c->ctx.path = p->lcf->cache_path;
u = p->lcf->upstream;
c->ctx.key.len = u->url.len + r->uri.len - u->location->len + r->args.len;
if (!(c->ctx.key.data = ngx_palloc(r->pool, c->ctx.key.len + 1))) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
last = ngx_cpymem(c->ctx.key.data, u->url.data, u->url.len);
last = ngx_cpymem(last, r->uri.data + u->location->len,
r->uri.len - u->location->len);
if (r->args.len > 0) {
*(last++) = '?';
last = ngx_cpymem(last, r->args.data, r->args.len);
}
*last = '\0';
p->header_in = ngx_create_temp_hunk(r->pool, p->lcf->header_buffer_size);
if (p->header_in == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
p->header_in->tag = (ngx_hunk_tag_t) &ngx_http_proxy_module;
c->ctx.buf = p->header_in;
p->cache = c;
rc = ngx_http_cache_get_file(r, &c->ctx);
if (rc == NGX_OK || rc == NGX_STALE) {
p->header_in->pos += c->ctx.header.size;
} else if (rc == NGX_DECLINED) {
p->header_in->pos += c->ctx.header.size;
p->header_in->last = p->header_in->pos;
}
return rc;
}
int ngx_http_proxy_process_cached_response(ngx_http_proxy_ctx_t *p)
{
int rc, i;
ngx_table_elt_t *h;
ngx_http_request_t *r;
ngx_http_proxy_cache_t *c;
rc = ngx_http_proxy_parse_status_line(p);
c = p->cache;
r = p->request;
if (rc == NGX_AGAIN) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"\"proxy_header_buffer_size\" "
"is too small to read header from \"%s\"",
c->ctx.file.name.data);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (rc == NGX_HTTP_PROXY_PARSE_NO_HEADER) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"no valid HTTP/1.0 header in \"%s\"",
c->ctx.file.name.data);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
/* rc == NGX_OK */
c->status = p->status;
c->status_line.len = p->status_end - p->status_start;
c->status_line.data = ngx_palloc(r->pool, c->status_line.len + 1);
if (c->status_line.data == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
ngx_cpystrn(c->status_line.data, p->status_start, c->status_line.len + 1);
ngx_log_debug(r->connection->log, "http cache status %d '%s'" _
c->status _ c->status_line.data);
c->headers_in.headers = ngx_create_table(r->pool, 20);
for ( ;; ) {
rc = ngx_http_parse_header_line(r, p->header_in);
if (rc == NGX_OK) {
/* a header line has been parsed successfully */
h = ngx_http_add_header(&c->headers_in, ngx_http_proxy_headers_in);
if (h == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
h->key.len = r->header_name_end - r->header_name_start;
h->value.len = r->header_end - r->header_start;
h->key.data = ngx_palloc(r->pool,
h->key.len + 1 + h->value.len + 1);
if (h->key.data == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
h->value.data = h->key.data + h->key.len + 1;
ngx_cpystrn(h->key.data, r->header_name_start, h->key.len + 1);
ngx_cpystrn(h->value.data, r->header_start, h->value.len + 1);
for (i = 0; ngx_http_proxy_headers_in[i].name.len != 0; i++) {
if (ngx_http_proxy_headers_in[i].name.len != h->key.len) {
continue;
}
if (ngx_strcasecmp(ngx_http_proxy_headers_in[i].name.data,
h->key.data) == 0)
{
*((ngx_table_elt_t **) ((char *) &c->headers_in
+ ngx_http_proxy_headers_in[i].offset)) = h;
break;
}
}
ngx_log_debug(r->connection->log, "HTTP cache header: '%s: %s'" _
h->key.data _ h->value.data);
continue;
} else if (rc == NGX_HTTP_PARSE_HEADER_DONE) {
/* a whole header has been parsed successfully */
ngx_log_debug(r->connection->log, "HTTP header done");
return ngx_http_proxy_send_cached_response(p);
} else if (rc == NGX_HTTP_PARSE_INVALID_HEADER) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"invalid header in \"%s\"",
c->ctx.file.name.data);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
/* rc == NGX_AGAIN || rc == NGX_HTTP_PARSE_TOO_LONG_HEADER */
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"\"proxy_header_buffer_size\" "
"is too small to read header from \"%s\"",
c->ctx.file.name.data);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
}
int ngx_http_proxy_send_cached_response(ngx_http_proxy_ctx_t *p)
{
int rc;
ngx_hunk_t *h;
ngx_chain_t out;
ngx_http_request_t *r;
r = p->request;
r->headers_out.status = p->status;
#if 0
r->headers_out.content_length_n = -1;
r->headers_out.content_length = NULL;
#endif
/* copy an cached header to r->headers_out */
if (ngx_http_proxy_copy_header(p, &p->cache->headers_in) == NGX_ERROR) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
/* we need to allocate all before the header would be sent */
if (!((h = ngx_calloc_hunk(r->pool)))) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (!((h->file = ngx_pcalloc(r->pool, sizeof(ngx_file_t))))) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
rc = ngx_http_send_header(r);
/* NEEDED ??? */ p->header_sent = 1;
if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
return rc;
}
/* TODO: part in p->header_in */
h->type = r->main ? NGX_HUNK_FILE : NGX_HUNK_FILE|NGX_HUNK_LAST;
h->file_pos = p->header_in->pos - p->header_in->start;
h->file_last = h->file_pos + p->cache->ctx.header.length;
h->file->fd = p->cache->ctx.file.fd;
h->file->log = r->connection->log;
out.hunk = h;
out.next = NULL;
return ngx_http_output_filter(r, &out);
}
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