通過調(diào)用 ngx_conf_parse 函數(shù)，開始了 http 配置塊的解析，并通過解析到的命令調(diào)用相應(yīng)的函數(shù)
在首個 NGX_HTTP_MODULE ngx_http_core_module 的 ngx_command_t 域中包含了大量的配置指令，它們都是在http{}塊中出現(xiàn)的，其中包括兩個重要的指令:
{ ngx_string("listen"),
NGX_HTTP_SRV_CONF|NGX_CONF_1MORE,
ngx_http_core_listen,
NGX_HTTP_SRV_CONF_OFFSET,
0,
NULL },
{ ngx_string("server"),
NGX_HTTP_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_NOARGS,
ngx_http_core_server,
0,
0,
NULL },
{ ngx_string("location"),
NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE12,
ngx_http_core_location,
NGX_HTTP_SRV_CONF_OFFSET,
0,
NULL },
這里配置了 listen、server 與 location 塊的解析函數(shù) ngx_http_core_listen、ngx_http_core_server 和 ngx_http_core_location.
server 塊解析 — ngx_http_core_server
// static char *
// ngx_http_core_server(ngx_conf_t *cf, ngx_command_t *cmd, void *dummy)
// http server 塊解析 {{{
static char *
ngx_http_core_server(ngx_conf_t *cf, ngx_command_t *cmd, void *dummy)
{
char *rv;
void *mconf;
ngx_uint_t i;
ngx_conf_t pcf;
ngx_http_module_t *module;
struct sockaddr_in *sin;
ngx_http_conf_ctx_t *ctx, *http_ctx;
ngx_http_listen_opt_t lsopt;
ngx_http_core_srv_conf_t *cscf, **cscfp;
ngx_http_core_main_conf_t *cmcf;
ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_conf_ctx_t));
if (ctx == NULL) {
return NGX_CONF_ERROR;
}
http_ctx = cf->ctx;
ctx->main_conf = http_ctx->main_conf;
/* the server{}'s srv_conf */
// 為所有 HTTP 模塊分配空間存儲 srv_conf
ctx->srv_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_http_max_module);
if (ctx->srv_conf == NULL) {
return NGX_CONF_ERROR;
}
/* the server{}'s loc_conf */
// 為所有 HTTP 模塊分配空間存儲 loc_conf
ctx->loc_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_http_max_module);
if (ctx->loc_conf == NULL) {
return NGX_CONF_ERROR;
}
// 循環(huán)調(diào)用每個模塊的 create_srv_conf 與 create_loc_conf 回調(diào)，創(chuàng)建配置結(jié)構(gòu)
for (i = 0; ngx_modules[i]; i++) {
if (ngx_modules[i]->type != NGX_HTTP_MODULE) {
continue;
}
module = ngx_modules[i]->ctx;
if (module->create_srv_conf) {
mconf = module->create_srv_conf(cf);
if (mconf == NULL) {
return NGX_CONF_ERROR;
}
ctx->srv_conf[ngx_modules[i]->ctx_index] = mconf;
}
if (module->create_loc_conf) {
mconf = module->create_loc_conf(cf);
if (mconf == NULL) {
return NGX_CONF_ERROR;
}
ctx->loc_conf[ngx_modules[i]->ctx_index] = mconf;
}
}
/* the server configuration context */
cscf = ctx->srv_conf[ngx_http_core_module.ctx_index];
cscf->ctx = ctx;
cmcf = ctx->main_conf[ngx_http_core_module.ctx_index];
cscfp = ngx_array_push(&cmcf->servers);
if (cscfp == NULL) {
return NGX_CONF_ERROR;
}
*cscfp = cscf;
/* parse inside server{} */
pcf = *cf;
cf->ctx = ctx;
cf->cmd_type = NGX_HTTP_SRV_CONF;
// 解析 server 塊配置
rv = ngx_conf_parse(cf, NULL);
*cf = pcf;
// 如果沒有監(jiān)聽任何端口，則監(jiān)聽默認的 80 或 8000端口
if (rv == NGX_CONF_OK && !cscf->listen) {
ngx_memzero(&lsopt, sizeof(ngx_http_listen_opt_t));
sin = &lsopt.u.sockaddr_in;
sin->sin_family = AF_INET;
#if (NGX_WIN32)
sin->sin_port = htons(80);
#else
sin->sin_port = htons((getuid() == 0) ? 80 : 8000);
#endif
sin->sin_addr.s_addr = INADDR_ANY;
lsopt.socklen = sizeof(struct sockaddr_in);
lsopt.backlog = NGX_LISTEN_BACKLOG;
lsopt.rcvbuf = -1;
lsopt.sndbuf = -1;
#if (NGX_HAVE_SETFIB)
lsopt.setfib = -1;
#endif
#if (NGX_HAVE_TCP_FASTOPEN)
lsopt.fastopen = -1;
#endif
lsopt.wildcard = 1;
(void) ngx_sock_ntop(&lsopt.u.sockaddr, lsopt.socklen, lsopt.addr,
NGX_SOCKADDR_STRLEN, 1);
if (ngx_http_add_listen(cf, cscf, &lsopt) != NGX_OK) {
return NGX_CONF_ERROR;
}
}
return rv;
} // }}}
location 塊解析 — ngx_http_core_location
// static char *
// ngx_http_core_location(ngx_conf_t *cf, ngx_command_t *cmd, void *dummy)
// location 塊配置解析 {{{
static char *
ngx_http_core_location(ngx_conf_t *cf, ngx_command_t *cmd, void *dummy)
{
char *rv;
u_char *mod;
size_t len;
ngx_str_t *value, *name;
ngx_uint_t i;
ngx_conf_t save;
ngx_http_module_t *module;
ngx_http_conf_ctx_t *ctx, *pctx;
ngx_http_core_loc_conf_t *clcf, *pclcf;
ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_conf_ctx_t));
if (ctx == NULL) {
return NGX_CONF_ERROR;
}
pctx = cf->ctx;
ctx->main_conf = pctx->main_conf;
ctx->srv_conf = pctx->srv_conf;
ctx->loc_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_http_max_module);
if (ctx->loc_conf == NULL) {
return NGX_CONF_ERROR;
}
for (i = 0; ngx_modules[i]; i++) {
if (ngx_modules[i]->type != NGX_HTTP_MODULE) {
continue;
}
module = ngx_modules[i]->ctx;
if (module->create_loc_conf) {
ctx->loc_conf[ngx_modules[i]->ctx_index] =
module->create_loc_conf(cf);
if (ctx->loc_conf[ngx_modules[i]->ctx_index] == NULL) {
return NGX_CONF_ERROR;
}
}
}
clcf = ctx->loc_conf[ngx_http_core_module.ctx_index];
clcf->loc_conf = ctx->loc_conf;
value = cf->args->elts;
if (cf->args->nelts == 3) {
len = value[1].len;
mod = value[1].data;
name = &value[2];
if (len == 1 && mod[0] == '=') {
clcf->name = *name;
clcf->exact_match = 1;
} else if (len == 2 && mod[0] == '^' && mod[1] == '~') {
clcf->name = *name;
clcf->noregex = 1;
} else if (len == 1 && mod[0] == '~') {
if (ngx_http_core_regex_location(cf, clcf, name, 0) != NGX_OK) {
return NGX_CONF_ERROR;
}
} else if (len == 2 && mod[0] == '~' && mod[1] == '*') {
if (ngx_http_core_regex_location(cf, clcf, name, 1) != NGX_OK) {
return NGX_CONF_ERROR;
}
} else {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid location modifier \"%V\"", &value[1]);
return NGX_CONF_ERROR;
}
} else {
name = &value[1];
if (name->data[0] == '=') {
clcf->name.len = name->len - 1;
clcf->name.data = name->data + 1;
clcf->exact_match = 1;
} else if (name->data[0] == '^' && name->data[1] == '~') {
clcf->name.len = name->len - 2;
clcf->name.data = name->data + 2;
clcf->noregex = 1;
} else if (name->data[0] == '~') {
name->len--;
name->data++;
if (name->data[0] == '*') {
name->len--;
name->data++;
if (ngx_http_core_regex_location(cf, clcf, name, 1) != NGX_OK) {
return NGX_CONF_ERROR;
}
} else {
if (ngx_http_core_regex_location(cf, clcf, name, 0) != NGX_OK) {
return NGX_CONF_ERROR;
}
}
} else {
clcf->name = *name;
if (name->data[0] == '@') {
clcf->named = 1;
}
}
}
pclcf = pctx->loc_conf[ngx_http_core_module.ctx_index];
if (pclcf->name.len) {
/* nested location */
#if 0
clcf->prev_location = pclcf;
#endif
if (pclcf->exact_match) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"location \"%V\" cannot be inside "
"the exact location \"%V\"",
&clcf->name, &pclcf->name);
return NGX_CONF_ERROR;
}
if (pclcf->named) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"location \"%V\" cannot be inside "
"the named location \"%V\"",
&clcf->name, &pclcf->name);
return NGX_CONF_ERROR;
}
if (clcf->named) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"named location \"%V\" can be "
"on the server level only",
&clcf->name);
return NGX_CONF_ERROR;
}
len = pclcf->name.len;
#if (NGX_PCRE)
if (clcf->regex == NULL
&& ngx_filename_cmp(clcf->name.data, pclcf->name.data, len) != 0)
#else
if (ngx_filename_cmp(clcf->name.data, pclcf->name.data, len) != 0)
#endif
{
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"location \"%V\" is outside location \"%V\"",
&clcf->name, &pclcf->name);
return NGX_CONF_ERROR;
}
}
// 將 location 配置加入到 locations 配置鏈表中
if (ngx_http_add_location(cf, &pclcf->locations, clcf) != NGX_OK) {
return NGX_CONF_ERROR;
}
save = *cf;
cf->ctx = ctx;
cf->cmd_type = NGX_HTTP_LOC_CONF;
rv = ngx_conf_parse(cf, NULL);
*cf = save;
return rv;
} // }}}
與 server 塊解析函數(shù) ngx_http_core_server 類似，他創(chuàng)建了所有模塊的 loc_conf，為了防止內(nèi)外層具有相同指令，在配置賦值完成后，會通過 merge 函數(shù)合并到一起。
然而，與 server 塊不同，location 塊在 location 后面會通過路徑或正則表達式指定 location 配置的應(yīng)用 uri，因此，在 ngx_http_core_location 函數(shù)中調(diào)用 PCRE 進行了 location 命令的解析。
解析完成后調(diào)用 ngx_http_add_location 將解析結(jié)果加入到 locations 鏈表中。
// ngx_int_t ngx_http_add_location(ngx_conf_t *cf, ngx_queue_t **locations,
// ngx_http_core_loc_conf_t *clcf)
// 將 location 配置加入到 locations 配置鏈表中 {{{
ngx_int_t
ngx_http_add_location(ngx_conf_t *cf, ngx_queue_t **locations,
ngx_http_core_loc_conf_t *clcf)
{
ngx_http_location_queue_t *lq;
if (*locations == NULL) {
*locations = ngx_palloc(cf->temp_pool,
sizeof(ngx_http_location_queue_t));
if (*locations == NULL) {
return NGX_ERROR;
}
ngx_queue_init(*locations);
}
lq = ngx_palloc(cf->temp_pool, sizeof(ngx_http_location_queue_t));
if (lq == NULL) {
return NGX_ERROR;
}
if (clcf->exact_match
#if (NGX_PCRE)
|| clcf->regex
#endif
|| clcf->named || clcf->noname)
{
lq->exact = clcf;
lq->inclusive = NULL;
} else {
lq->exact = NULL;
lq->inclusive = clcf;
}
lq->name = &clcf->name;
lq->file_name = cf->conf_file->file.name.data;
lq->line = cf->conf_file->line;
ngx_queue_init(&lq->list);
ngx_queue_insert_tail(*locations, &lq->queue);
return NGX_OK;
} // }}}
配置解析全部完成后的配置結(jié)構(gòu)。
