blob: dbe0fe838179ba540528f46da988baeb74ef18f6 [file] [log] [blame]
/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
typedef struct {
ngx_http_upstream_conf_t upstream;
ngx_int_t index;
} ngx_http_memcached_loc_conf_t;
typedef struct {
size_t rest;
ngx_http_request_t *request;
ngx_str_t key;
} ngx_http_memcached_ctx_t;
static ngx_int_t ngx_http_memcached_create_request(ngx_http_request_t *r);
static ngx_int_t ngx_http_memcached_reinit_request(ngx_http_request_t *r);
static ngx_int_t ngx_http_memcached_process_header(ngx_http_request_t *r);
static ngx_int_t ngx_http_memcached_filter_init(void *data);
static ngx_int_t ngx_http_memcached_filter(void *data, ssize_t bytes);
static void ngx_http_memcached_abort_request(ngx_http_request_t *r);
static void ngx_http_memcached_finalize_request(ngx_http_request_t *r,
ngx_int_t rc);
static void *ngx_http_memcached_create_loc_conf(ngx_conf_t *cf);
static char *ngx_http_memcached_merge_loc_conf(ngx_conf_t *cf,
void *parent, void *child);
static char *ngx_http_memcached_pass(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static ngx_conf_bitmask_t ngx_http_memcached_next_upstream_masks[] = {
{ ngx_string("error"), NGX_HTTP_UPSTREAM_FT_ERROR },
{ ngx_string("timeout"), NGX_HTTP_UPSTREAM_FT_TIMEOUT },
{ ngx_string("invalid_response"), NGX_HTTP_UPSTREAM_FT_INVALID_HEADER },
{ ngx_string("not_found"), NGX_HTTP_UPSTREAM_FT_HTTP_404 },
{ ngx_string("off"), NGX_HTTP_UPSTREAM_FT_OFF },
{ ngx_null_string, 0 }
};
static ngx_command_t ngx_http_memcached_commands[] = {
{ ngx_string("memcached_pass"),
NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF|NGX_CONF_TAKE1,
ngx_http_memcached_pass,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("memcached_bind"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_http_upstream_bind_set_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_memcached_loc_conf_t, upstream.local),
NULL },
{ ngx_string("memcached_connect_timeout"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_msec_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_memcached_loc_conf_t, upstream.connect_timeout),
NULL },
{ ngx_string("memcached_send_timeout"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_msec_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_memcached_loc_conf_t, upstream.send_timeout),
NULL },
{ ngx_string("memcached_buffer_size"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_memcached_loc_conf_t, upstream.buffer_size),
NULL },
{ ngx_string("memcached_read_timeout"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_msec_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_memcached_loc_conf_t, upstream.read_timeout),
NULL },
{ ngx_string("memcached_next_upstream"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
ngx_conf_set_bitmask_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_memcached_loc_conf_t, upstream.next_upstream),
&ngx_http_memcached_next_upstream_masks },
ngx_null_command
};
static ngx_http_module_t ngx_http_memcached_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_memcached_create_loc_conf, /* create location configration */
ngx_http_memcached_merge_loc_conf /* merge location configration */
};
ngx_module_t ngx_http_memcached_module = {
NGX_MODULE_V1,
&ngx_http_memcached_module_ctx, /* module context */
ngx_http_memcached_commands, /* module directives */
NGX_HTTP_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_str_t ngx_http_memcached_key = ngx_string("memcached_key");
#define NGX_HTTP_MEMCACHED_END (sizeof(ngx_http_memcached_end) - 1)
static u_char ngx_http_memcached_end[] = CRLF "END" CRLF;
static ngx_int_t
ngx_http_memcached_handler(ngx_http_request_t *r)
{
ngx_int_t rc;
ngx_http_upstream_t *u;
ngx_http_memcached_ctx_t *ctx;
ngx_http_memcached_loc_conf_t *mlcf;
if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD))) {
return NGX_HTTP_NOT_ALLOWED;
}
rc = ngx_http_discard_request_body(r);
if (rc != NGX_OK) {
return rc;
}
if (ngx_http_set_content_type(r) != NGX_OK) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
if (ngx_http_upstream_create(r) != NGX_OK) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
u = r->upstream;
ngx_str_set(&u->schema, "memcached://");
u->output.tag = (ngx_buf_tag_t) &ngx_http_memcached_module;
mlcf = ngx_http_get_module_loc_conf(r, ngx_http_memcached_module);
u->conf = &mlcf->upstream;
u->create_request = ngx_http_memcached_create_request;
u->reinit_request = ngx_http_memcached_reinit_request;
u->process_header = ngx_http_memcached_process_header;
u->abort_request = ngx_http_memcached_abort_request;
u->finalize_request = ngx_http_memcached_finalize_request;
ctx = ngx_palloc(r->pool, sizeof(ngx_http_memcached_ctx_t));
if (ctx == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
ctx->rest = NGX_HTTP_MEMCACHED_END;
ctx->request = r;
ngx_http_set_ctx(r, ctx, ngx_http_memcached_module);
u->input_filter_init = ngx_http_memcached_filter_init;
u->input_filter = ngx_http_memcached_filter;
u->input_filter_ctx = ctx;
r->main->count++;
ngx_http_upstream_init(r);
return NGX_DONE;
}
static ngx_int_t
ngx_http_memcached_create_request(ngx_http_request_t *r)
{
size_t len;
uintptr_t escape;
ngx_buf_t *b;
ngx_chain_t *cl;
ngx_http_memcached_ctx_t *ctx;
ngx_http_variable_value_t *vv;
ngx_http_memcached_loc_conf_t *mlcf;
mlcf = ngx_http_get_module_loc_conf(r, ngx_http_memcached_module);
vv = ngx_http_get_indexed_variable(r, mlcf->index);
if (vv == NULL || vv->not_found || vv->len == 0) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"the \"$memcached_key\" variable is not set");
return NGX_ERROR;
}
escape = 2 * ngx_escape_uri(NULL, vv->data, vv->len, NGX_ESCAPE_MEMCACHED);
len = sizeof("get ") - 1 + vv->len + escape + sizeof(CRLF) - 1;
b = ngx_create_temp_buf(r->pool, len);
if (b == NULL) {
return NGX_ERROR;
}
cl = ngx_alloc_chain_link(r->pool);
if (cl == NULL) {
return NGX_ERROR;
}
cl->buf = b;
cl->next = NULL;
r->upstream->request_bufs = cl;
*b->last++ = 'g'; *b->last++ = 'e'; *b->last++ = 't'; *b->last++ = ' ';
ctx = ngx_http_get_module_ctx(r, ngx_http_memcached_module);
ctx->key.data = b->last;
if (escape == 0) {
b->last = ngx_copy(b->last, vv->data, vv->len);
} else {
b->last = (u_char *) ngx_escape_uri(b->last, vv->data, vv->len,
NGX_ESCAPE_MEMCACHED);
}
ctx->key.len = b->last - ctx->key.data;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http memcached request: \"%V\"", &ctx->key);
*b->last++ = CR; *b->last++ = LF;
return NGX_OK;
}
static ngx_int_t
ngx_http_memcached_reinit_request(ngx_http_request_t *r)
{
return NGX_OK;
}
static ngx_int_t
ngx_http_memcached_process_header(ngx_http_request_t *r)
{
u_char *p, *len;
ngx_str_t line;
ngx_http_upstream_t *u;
ngx_http_memcached_ctx_t *ctx;
u = r->upstream;
for (p = u->buffer.pos; p < u->buffer.last; p++) {
if (*p == LF) {
goto found;
}
}
return NGX_AGAIN;
found:
*p = '\0';
line.len = p - u->buffer.pos - 1;
line.data = u->buffer.pos;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"memcached: \"%V\"", &line);
p = u->buffer.pos;
ctx = ngx_http_get_module_ctx(r, ngx_http_memcached_module);
if (ngx_strncmp(p, "VALUE ", sizeof("VALUE ") - 1) == 0) {
p += sizeof("VALUE ") - 1;
if (ngx_strncmp(p, ctx->key.data, ctx->key.len) != 0) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"memcached sent invalid key in response \"%V\" "
"for key \"%V\"",
&line, &ctx->key);
return NGX_HTTP_UPSTREAM_INVALID_HEADER;
}
p += ctx->key.len;
if (*p++ != ' ') {
goto no_valid;
}
/* skip flags */
while (*p) {
if (*p++ == ' ') {
goto length;
}
}
goto no_valid;
length:
len = p;
while (*p && *p++ != CR) { /* void */ }
u->headers_in.content_length_n = ngx_atoof(len, p - len - 1);
if (u->headers_in.content_length_n == -1) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"memcached sent invalid length in response \"%V\" "
"for key \"%V\"",
&line, &ctx->key);
return NGX_HTTP_UPSTREAM_INVALID_HEADER;
}
u->headers_in.status_n = 200;
u->state->status = 200;
u->buffer.pos = p + 1;
return NGX_OK;
}
if (ngx_strcmp(p, "END\x0d") == 0) {
ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
"key: \"%V\" was not found by memcached", &ctx->key);
u->headers_in.status_n = 404;
u->state->status = 404;
u->keepalive = 1;
return NGX_OK;
}
no_valid:
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"memcached sent invalid response: \"%V\"", &line);
return NGX_HTTP_UPSTREAM_INVALID_HEADER;
}
static ngx_int_t
ngx_http_memcached_filter_init(void *data)
{
ngx_http_memcached_ctx_t *ctx = data;
ngx_http_upstream_t *u;
u = ctx->request->upstream;
u->length += NGX_HTTP_MEMCACHED_END;
return NGX_OK;
}
static ngx_int_t
ngx_http_memcached_filter(void *data, ssize_t bytes)
{
ngx_http_memcached_ctx_t *ctx = data;
u_char *last;
ngx_buf_t *b;
ngx_chain_t *cl, **ll;
ngx_http_upstream_t *u;
u = ctx->request->upstream;
b = &u->buffer;
if (u->length == (ssize_t) ctx->rest) {
if (ngx_strncmp(b->last,
ngx_http_memcached_end + NGX_HTTP_MEMCACHED_END - ctx->rest,
bytes)
!= 0)
{
ngx_log_error(NGX_LOG_ERR, ctx->request->connection->log, 0,
"memcached sent invalid trailer");
u->length = 0;
ctx->rest = 0;
return NGX_OK;
}
u->length -= bytes;
ctx->rest -= bytes;
if (u->length == 0) {
u->keepalive = 1;
}
return NGX_OK;
}
for (cl = u->out_bufs, ll = &u->out_bufs; cl; cl = cl->next) {
ll = &cl->next;
}
cl = ngx_chain_get_free_buf(ctx->request->pool, &u->free_bufs);
if (cl == NULL) {
return NGX_ERROR;
}
cl->buf->flush = 1;
cl->buf->memory = 1;
*ll = cl;
last = b->last;
cl->buf->pos = last;
b->last += bytes;
cl->buf->last = b->last;
cl->buf->tag = u->output.tag;
ngx_log_debug4(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0,
"memcached filter bytes:%z size:%z length:%z rest:%z",
bytes, b->last - b->pos, u->length, ctx->rest);
if (bytes <= (ssize_t) (u->length - NGX_HTTP_MEMCACHED_END)) {
u->length -= bytes;
return NGX_OK;
}
last += u->length - NGX_HTTP_MEMCACHED_END;
if (ngx_strncmp(last, ngx_http_memcached_end, b->last - last) != 0) {
ngx_log_error(NGX_LOG_ERR, ctx->request->connection->log, 0,
"memcached sent invalid trailer");
b->last = last;
cl->buf->last = last;
u->length = 0;
ctx->rest = 0;
return NGX_OK;
}
ctx->rest -= b->last - last;
b->last = last;
cl->buf->last = last;
u->length = ctx->rest;
if (u->length == 0) {
u->keepalive = 1;
}
return NGX_OK;
}
static void
ngx_http_memcached_abort_request(ngx_http_request_t *r)
{
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"abort http memcached request");
return;
}
static void
ngx_http_memcached_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
{
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"finalize http memcached request");
return;
}
static void *
ngx_http_memcached_create_loc_conf(ngx_conf_t *cf)
{
ngx_http_memcached_loc_conf_t *conf;
conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_memcached_loc_conf_t));
if (conf == NULL) {
return NULL;
}
/*
* set by ngx_pcalloc():
*
* conf->upstream.bufs.num = 0;
* conf->upstream.next_upstream = 0;
* conf->upstream.temp_path = NULL;
* conf->upstream.uri = { 0, NULL };
* conf->upstream.location = NULL;
*/
conf->upstream.connect_timeout = NGX_CONF_UNSET_MSEC;
conf->upstream.send_timeout = NGX_CONF_UNSET_MSEC;
conf->upstream.read_timeout = NGX_CONF_UNSET_MSEC;
conf->upstream.buffer_size = NGX_CONF_UNSET_SIZE;
/* the hardcoded values */
conf->upstream.cyclic_temp_file = 0;
conf->upstream.buffering = 0;
conf->upstream.ignore_client_abort = 0;
conf->upstream.send_lowat = 0;
conf->upstream.bufs.num = 0;
conf->upstream.busy_buffers_size = 0;
conf->upstream.max_temp_file_size = 0;
conf->upstream.temp_file_write_size = 0;
conf->upstream.intercept_errors = 1;
conf->upstream.intercept_404 = 1;
conf->upstream.pass_request_headers = 0;
conf->upstream.pass_request_body = 0;
conf->index = NGX_CONF_UNSET;
return conf;
}
static char *
ngx_http_memcached_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_http_memcached_loc_conf_t *prev = parent;
ngx_http_memcached_loc_conf_t *conf = child;
ngx_conf_merge_msec_value(conf->upstream.connect_timeout,
prev->upstream.connect_timeout, 60000);
ngx_conf_merge_msec_value(conf->upstream.send_timeout,
prev->upstream.send_timeout, 60000);
ngx_conf_merge_msec_value(conf->upstream.read_timeout,
prev->upstream.read_timeout, 60000);
ngx_conf_merge_size_value(conf->upstream.buffer_size,
prev->upstream.buffer_size,
(size_t) ngx_pagesize);
ngx_conf_merge_bitmask_value(conf->upstream.next_upstream,
prev->upstream.next_upstream,
(NGX_CONF_BITMASK_SET
|NGX_HTTP_UPSTREAM_FT_ERROR
|NGX_HTTP_UPSTREAM_FT_TIMEOUT));
if (conf->upstream.next_upstream & NGX_HTTP_UPSTREAM_FT_OFF) {
conf->upstream.next_upstream = NGX_CONF_BITMASK_SET
|NGX_HTTP_UPSTREAM_FT_OFF;
}
if (conf->upstream.upstream == NULL) {
conf->upstream.upstream = prev->upstream.upstream;
}
if (conf->index == NGX_CONF_UNSET) {
conf->index = prev->index;
}
return NGX_CONF_OK;
}
static char *
ngx_http_memcached_pass(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_memcached_loc_conf_t *mlcf = conf;
ngx_str_t *value;
ngx_url_t u;
ngx_http_core_loc_conf_t *clcf;
if (mlcf->upstream.upstream) {
return "is duplicate";
}
value = cf->args->elts;
ngx_memzero(&u, sizeof(ngx_url_t));
u.url = value[1];
u.no_resolve = 1;
mlcf->upstream.upstream = ngx_http_upstream_add(cf, &u, 0);
if (mlcf->upstream.upstream == NULL) {
return NGX_CONF_ERROR;
}
clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
clcf->handler = ngx_http_memcached_handler;
if (clcf->name.data[clcf->name.len - 1] == '/') {
clcf->auto_redirect = 1;
}
mlcf->index = ngx_http_get_variable_index(cf, &ngx_http_memcached_key);
if (mlcf->index == NGX_ERROR) {
return NGX_CONF_ERROR;
}
return NGX_CONF_OK;
}