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#ifndef DDEBUG
#define DDEBUG 0
#endif
#include "ddebug.h"
#include "ngx_http_redis2_handler.h"
#include "ngx_http_redis2_reply.h"
#include "ngx_http_redis2_util.h"
static ngx_int_t ngx_http_redis2_create_request(ngx_http_request_t *r);
static ngx_int_t ngx_http_redis2_reinit_request(ngx_http_request_t *r);
static ngx_int_t ngx_http_redis2_process_header(ngx_http_request_t *r);
static ngx_int_t ngx_http_redis2_filter_init(void *data);
static ngx_int_t ngx_http_redis2_filter(void *data, ssize_t bytes);
static void ngx_http_redis2_abort_request(ngx_http_request_t *r);
static void ngx_http_redis2_finalize_request(ngx_http_request_t *r,
ngx_int_t rc);
ngx_int_t
ngx_http_redis2_handler(ngx_http_request_t *r)
{
ngx_int_t rc;
ngx_http_upstream_t *u;
ngx_http_redis2_ctx_t *ctx;
ngx_http_redis2_loc_conf_t *rlcf;
ngx_str_t target;
ngx_url_t url;
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;
rlcf = ngx_http_get_module_loc_conf(r, ngx_http_redis2_module);
if (rlcf->complex_target) {
/* variables used in the redis2_pass directive */
if (ngx_http_complex_value(r, rlcf->complex_target, &target)
!= NGX_OK)
{
return NGX_ERROR;
}
if (target.len == 0) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"handler: empty \"redis2_pass\" target");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
url.host = target;
url.port = 0;
url.no_resolve = 1;
rlcf->upstream.upstream = ngx_http_redis2_upstream_add(r, &url);
if (rlcf->upstream.upstream == NULL) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"redis2: upstream \"%V\" not found", &target);
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
}
ngx_str_set(&u->schema, "redis2://");
u->output.tag = (ngx_buf_tag_t) &ngx_http_redis2_module;
u->conf = &rlcf->upstream;
u->create_request = ngx_http_redis2_create_request;
u->reinit_request = ngx_http_redis2_reinit_request;
u->process_header = ngx_http_redis2_process_header;
u->abort_request = ngx_http_redis2_abort_request;
u->finalize_request = ngx_http_redis2_finalize_request;
ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_redis2_ctx_t));
if (ctx == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
ctx->request = r;
ctx->state = NGX_ERROR;
ngx_http_set_ctx(r, ctx, ngx_http_redis2_module);
u->input_filter_init = ngx_http_redis2_filter_init;
u->input_filter = ngx_http_redis2_filter;
u->input_filter_ctx = ctx;
rc = ngx_http_read_client_request_body(r, ngx_http_upstream_init);
if (rc >= NGX_HTTP_SPECIAL_RESPONSE) {
return rc;
}
return NGX_DONE;
}
static ngx_int_t
ngx_http_redis2_create_request(ngx_http_request_t *r)
{
ngx_buf_t *b;
ngx_chain_t *cl;
ngx_http_redis2_loc_conf_t *rlcf;
ngx_str_t query;
ngx_str_t query_count;
ngx_int_t rc;
ngx_http_redis2_ctx_t *ctx;
ngx_int_t n;
ctx = ngx_http_get_module_ctx(r, ngx_http_redis2_module);
rlcf = ngx_http_get_module_loc_conf(r, ngx_http_redis2_module);
if (rlcf->queries) {
ctx->query_count = rlcf->queries->nelts;
rc = ngx_http_redis2_build_query(r, rlcf->queries, &b);
if (rc != NGX_OK) {
return rc;
}
} else if (rlcf->literal_query.len == 0) {
if (rlcf->complex_query == NULL) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"no redis2 query specified or the query is empty");
return NGX_ERROR;
}
if (ngx_http_complex_value(r, rlcf->complex_query, &query)
!= NGX_OK)
{
return NGX_ERROR;
}
if (query.len == 0) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"the redis query is empty");
return NGX_ERROR;
}
if (rlcf->complex_query_count == NULL) {
ctx->query_count = 1;
} else {
if (ngx_http_complex_value(r, rlcf->complex_query_count,
&query_count)
!= NGX_OK)
{
return NGX_ERROR;
}
if (query_count.len == 0) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"the N argument to redis2_raw_queries is empty");
return NGX_ERROR;
}
n = ngx_atoi(query_count.data, query_count.len);
if (n == NGX_ERROR || n == 0) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"the N argument to redis2_raw_queries is "
"invalid");
return NGX_ERROR;
}
ctx->query_count = n;
}
b = ngx_create_temp_buf(r->pool, query.len);
if (b == NULL) {
return NGX_ERROR;
}
b->last = ngx_copy(b->pos, query.data, query.len);
} else {
ctx->query_count = 1;
b = ngx_calloc_buf(r->pool);
if (b == NULL) {
return NGX_ERROR;
}
b->pos = rlcf->literal_query.data;
b->last = b->pos + rlcf->literal_query.len;
b->memory = 1;
}
cl = ngx_alloc_chain_link(r->pool);
if (cl == NULL) {
return NGX_ERROR;
}
cl->buf = b;
cl->next = NULL;
r->upstream->request_bufs = cl;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http redis2 request: \"%V\"", &rlcf->literal_query);
return NGX_OK;
}
static ngx_int_t
ngx_http_redis2_reinit_request(ngx_http_request_t *r)
{
return NGX_OK;
}
static ngx_int_t
ngx_http_redis2_process_header(ngx_http_request_t *r)
{
ngx_http_upstream_t *u;
ngx_http_redis2_ctx_t *ctx;
ngx_buf_t *b;
u_char chr;
ngx_str_t buf;
u = r->upstream;
b = &u->buffer;
if (b->last - b->pos < (ssize_t) sizeof(u_char)) {
return NGX_AGAIN;
}
ctx = ngx_http_get_module_ctx(r, ngx_http_redis2_module);
/* the first char is the response header */
chr = *b->pos;
dd("response header: %c (ascii %d)", chr, chr);
switch (chr) {
case '+':
case '-':
case ':':
case '$':
case '*':
ctx->filter = ngx_http_redis2_process_reply;
break;
default:
buf.data = b->pos;
buf.len = b->last - b->pos;
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"redis2 sent invalid response: \"%V\"", &buf);
return NGX_HTTP_UPSTREAM_INVALID_HEADER;
}
u->headers_in.status_n = NGX_HTTP_OK;
u->state->status = NGX_HTTP_OK;
return NGX_OK;
}
static ngx_int_t
ngx_http_redis2_filter_init(void *data)
{
#if 0
ngx_http_redis2_ctx_t *ctx = data;
ngx_http_upstream_t *u;
u = ctx->request->upstream;
#endif
return NGX_OK;
}
static ngx_int_t
ngx_http_redis2_filter(void *data, ssize_t bytes)
{
ngx_http_redis2_ctx_t *ctx = data;
return ctx->filter(ctx, bytes);
}
static void
ngx_http_redis2_abort_request(ngx_http_request_t *r)
{
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"abort http redis2 request");
return;
}
static void
ngx_http_redis2_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
{
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"finalize http redis2 request");
if (rc >= NGX_HTTP_SPECIAL_RESPONSE) {
r->headers_out.status = rc;
}
return;
}
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