我们继续分析ngx_http_block函数剩余的代码，剩下的代码就是处理phases和监听的端口、地址、servername的。
代码语言：javascript复制// 恢复上下文
*cf = pcf;
/* init lists of the handlers */
ngx_init_array(cmcf->phases[NGX_HTTP_REWRITE_PHASE].handlers,
cf->cycle->pool, 10, sizeof(ngx_http_handler_pt),
NGX_CONF_ERROR);
cmcf->phases[NGX_HTTP_REWRITE_PHASE].type = NGX_OK;
/* the special find config phase for single handler */
ngx_init_array(cmcf->phases[NGX_HTTP_FIND_CONFIG_PHASE].handlers,
cf->cycle->pool, 1, sizeof(ngx_http_handler_pt),
NGX_CONF_ERROR);
cmcf->phases[NGX_HTTP_FIND_CONFIG_PHASE].type = NGX_OK;
ngx_test_null(h, ngx_push_array(
&cmcf->phases[NGX_HTTP_FIND_CONFIG_PHASE].handlers),
NGX_CONF_ERROR);
*h = ngx_http_find_location_config;
ngx_init_array(cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers,
cf->cycle->pool, 10, sizeof(ngx_http_handler_pt),
NGX_CONF_ERROR);
cmcf->phases[NGX_HTTP_ACCESS_PHASE].type = NGX_DECLINED;
ngx_init_array(cmcf->phases[NGX_HTTP_CONTENT_PHASE].handlers,
cf->cycle->pool, 10, sizeof(ngx_http_handler_pt),
NGX_CONF_ERROR);
cmcf->phases[NGX_HTTP_CONTENT_PHASE].type = NGX_OK;
/*
* create the lists of the ports, the addresses and the server names
* to allow quickly find the server core module configuration at run-time
*/
ngx_init_array(in_ports, cf->pool, 10, sizeof(ngx_http_in_port_t),
NGX_CONF_ERROR);
/* "server" directives */
cscfp = cmcf->servers.elts;
// 遍历每个server下的每个listen结构的每个端口，构造端口->地址->servername的多级结构
for (s = 0; s < cmcf->servers.nelts; s ) {
/* "listen" directives */
// 在解析listen指令的时候写入
lscf = cscfp[s]->listen.elts;
for (l = 0; l < cscfp[s]->listen.nelts; l ) {
port_found = 0;
/* AF_INET only */
in_port = in_ports.elts;
for (p = 0; p < in_ports.nelts; p ) {
if (lscf[l].port == in_port[p].port) {
// 端口已经在监听
/* the port is already in the port list */
port_found = 1;
addr_found = 0;
// 监听了这个端口的地址列表
in_addr = in_port[p].addrs.elts;
for (a = 0; a < in_port[p].addrs.nelts; a ) {
// 监听的端口相等，判断地址是否也相等
if (lscf[l].addr == in_addr[a].addr) {
/* the address is already bound to this port */
/* "server_name" directives */
// server对应的servername列表
s_name = cscfp[s]->server_names.elts;
for (n = 0; n < cscfp[s]->server_names.nelts; n ) {
/*
* add the server name and server core module
* configuration to the address:port
*/
/* TODO: duplicate names can be checked here */
ngx_test_null(name,
ngx_push_array(&in_addr[a].names),
NGX_CONF_ERROR);
name->name = s_name[n].name;
name->core_srv_conf = s_name[n].core_srv_conf;
}
/*
* check duplicate "default" server that
* serves this address:port
*/
// 同一个server配置里只能有一个default_server
if (lscf[l].default_server) {
if (in_addr[a].default_server) {
ngx_log_error(NGX_LOG_ERR, cf->log, 0,
"duplicate default server in %s:%d",
lscf[l].file_name.data,
lscf[l].line);
return NGX_CONF_ERROR;
}
in_addr[a].core_srv_conf = cscfp[s];
in_addr[a].default_server = 1;
}
addr_found = 1;
break;
} else if (in_addr[a].addr == INADDR_ANY) {
/*
* "*:port" must be the last resort so move it
* to the end of the address list and add
* the new address at its place
*/
/*
如果监听的地址是any，则把any的项放到地址列表的最后，
原来的位置填充当前的listen配置的信息,遍历到any项说明
已经是地址列表的最后一项
*/
ngx_test_null(inaddr,
ngx_push_array(&in_port[p].addrs),
NGX_CONF_ERROR);
ngx_memcpy(inaddr, &in_addr[a],
sizeof(ngx_http_in_addr_t));
in_addr[a].addr = lscf[l].addr;
in_addr[a].default_server = lscf[l].default_server;
in_addr[a].core_srv_conf = cscfp[s];
/*
* create the empty list of the server names that
* can be served on this address:port
*/
ngx_init_array(inaddr->names, cf->pool, 10,
sizeof(ngx_http_server_name_t),
NGX_CONF_ERROR);
// 置1，下面不需要再新增一个项
addr_found = 1;
// 跳出循环，因为已经遍历到了any项了，说明是最后一项了
break;
}
}
// 还没有该地址的项，新增一个
if (!addr_found) {
/*
* add the address to the addresses list that
* bound to this port
*/
ngx_test_null(inaddr,
ngx_push_array(&in_port[p].addrs),
NGX_CONF_ERROR);
inaddr->addr = lscf[l].addr;
inaddr->default_server = lscf[l].default_server;
inaddr->core_srv_conf = cscfp[s];
/*
* create the empty list of the server names that
* can be served on this address:port
*/
ngx_init_array(inaddr->names, cf->pool, 10,
sizeof(ngx_http_server_name_t),
NGX_CONF_ERROR);
}
}
}
// 在已监听端口里没有找到当前端口
if (!port_found) {
/* add the port to the in_port list */
// 记录该端口
ngx_test_null(in_port,
ngx_push_array(&in_ports),
NGX_CONF_ERROR);
in_port->port = lscf[l].port;
ngx_test_null(in_port->port_text.data, ngx_palloc(cf->pool, 7),
NGX_CONF_ERROR);
in_port->port_text.len = ngx_snprintf((char *)
in_port->port_text.data,
7, ":%d",
in_port->port);
/* create list of the addresses that bound to this port ... */
// 监听了这个端口的地址列表
ngx_init_array(in_port->addrs, cf->pool, 10,
sizeof(ngx_http_in_addr_t),
NGX_CONF_ERROR);
ngx_test_null(inaddr, ngx_push_array(&in_port->addrs),
NGX_CONF_ERROR);
/* ... and add the address to this list */
inaddr->addr = lscf[l].addr;
inaddr->default_server = lscf[l].default_server;
// 记录server配置，方便后续快速查找
inaddr->core_srv_conf = cscfp[s];
/*
* create the empty list of the server names that
* can be served on this address:port
*/
ngx_init_array(inaddr->names, cf->pool, 10,
sizeof(ngx_http_server_name_t),
NGX_CONF_ERROR);
}
}
}
// 代码执行到这，内存视图对应下图的图一（圆圈里是1）。
/* optimize the lists of the ports, the addresses and the server names */
/* AF_INET only */
// 优化，如果不存在虚拟主机则不需要保存servername，因为servername是用来匹配虚拟主机的
// 监听的端口列表
in_port = in_ports.elts;
for (p = 0; p < in_ports.nelts; p ) {
/* check whether the all server names point to the same server */
// 地址列表
in_addr = in_port[p].addrs.elts;
for (a = 0; a < in_port[p].addrs.nelts; a ) {
virtual_names = 0;
// servername列表
name = in_addr[a].names.elts;
for (n = 0; n < in_addr[a].names.nelts; n ) {
/*
比较当前的地址和该地址下所有的servername，如果指向的server配置
是一样的，说明当前的地址收到连接或者请求的时候，直接给server里配置的服务
就行，如果有一个servername指向的server配置和当前地址的不一样，说明当一个请求或
连接到来时，nginx无法通过地址决定该请求转发给哪个服务，还需要servername信息，即
虚拟主机名
*/
if (in_addr[a].core_srv_conf != name[n].core_srv_conf) {
virtual_names = 1;
break;
}
}
/*
* if the all server names point to the same server
* then we do not need to check them at run-time
*/
// 没有配置虚拟主机则不需要保存servername信息
if (!virtual_names) {
in_addr[a].names.nelts = 0;
}
}
/*
* if there's the binding to "*:port" then we need to bind()
* to "*:port" only and ignore the other bindings
*/
// 地址列表的最后一项是不是any，如果绑定的地址中有any，则绑定该地址即可，其他的地址不需要绑定了
if (in_addr[a - 1].addr == INADDR_ANY) {
a--;
} else {
a = 0;
}
in_addr = in_port[p].addrs.elts;
while (a < in_port[p].addrs.nelts) {
// push到cycle->listening中，并填充某些字段
ls = ngx_listening_inet_stream_socket(cf, in_addr[a].addr,
in_port[p].port);
if (ls == NULL) {
return NGX_CONF_ERROR;
}
ls->backlog = -1;
#if 0
#if 0
ls->nonblocking = 1;
#else
ls->nonblocking = 0;
#endif
#endif
ls->addr_ntop = 1;
ls->handler = ngx_http_init_connection;
// 地址对应的server配置
cscf = in_addr[a].core_srv_conf;
ls->pool_size = cscf->connection_pool_size;
ls->post_accept_timeout = cscf->post_accept_timeout;
clcf = cscf->ctx->loc_conf[ngx_http_core_module.ctx_index];
ls->log = clcf->err_log;
#if (WIN32)
iocpcf = ngx_event_get_conf(cf->cycle->conf_ctx, ngx_iocp_module);
if (iocpcf->acceptex_read) {
ls->post_accept_buffer_size = cscf->client_header_buffer_size;
}
#endif
ls->ctx = ctx;
// 有多个地址并且没有监听any地址
if (in_port[p].addrs.nelts > 1) {
in_addr = in_port[p].addrs.elts;
// 没有绑定any的配置
if (in_addr[in_port[p].addrs.nelts - 1].addr != INADDR_ANY) {
/*
* if this port has not the "*:port" binding then create
* the separate ngx_http_in_port_t for the all bindings
*/
/*
分配一个新的端口和地址结构，形成一个端口对应一个地址的结构，
但是servername是共享的，比如端口1*地址数 端口2*地址数个结构体
*/
ngx_test_null(inport,
ngx_palloc(cf->pool,
sizeof(ngx_http_in_port_t)),
NGX_CONF_ERROR);
// 复制
inport->port = in_port[p].port;
inport->port_text = in_port[p].port_text;
/* init list of the addresses ... */
ngx_init_array(inport->addrs, cf->pool, 1,
sizeof(ngx_http_in_addr_t),
NGX_CONF_ERROR);
/* ... and set up it with the first address */
// 地址等于当前循环的地址
inport->addrs.nelts = 1;
inport->addrs.elts = in_port[p].addrs.elts;
ls->servers = inport;
/* prepare for the next cycle */
// 指向地址列表中下一个地址
in_port[p].addrs.elts = (char *) in_port[p].addrs.elts
in_port[p].addrs.size;
in_port[p].addrs.nelts--;
in_addr = (ngx_http_in_addr_t *) in_port[p].addrs.elts;
a = 0;
continue;
}
}
ls->servers = &in_port[p];
a ;
}
}// 初始化listening结构体中ip地址和端口相关的字段
ngx_listening_t *ngx_listening_inet_stream_socket(ngx_conf_t *cf,
in_addr_t addr,
in_port_t port)
{
size_t len;
ngx_listening_t *ls;
struct sockaddr_in *addr_in;
if (!(ls = ngx_array_push(&cf->cycle->listening))) {
return NULL;
}
ngx_memzero(ls, sizeof(ngx_listening_t));
if (!(addr_in = ngx_pcalloc(cf->pool, sizeof(struct sockaddr_in)))) {
return NULL;
}
#if (HAVE_SIN_LEN)
addr_in->sin_len = sizeof(struct sockaddr_in);
#endif
addr_in->sin_family = AF_INET;
addr_in->sin_addr.s_addr = addr;
addr_in->sin_port = htons(port);
if (!(ls->addr_text.data = ngx_palloc(cf->pool, INET_ADDRSTRLEN 6))) {
return NULL;
}
len = ngx_inet_ntop(AF_INET, &addr, ls->addr_text.data, INET_ADDRSTRLEN);
ls->addr_text.len = ngx_snprintf((char *) ls->addr_text.data len,
6, ":%d", port);
ls->fd = (ngx_socket_t) -1;
ls->family = AF_INET;
ls->type = SOCK_STREAM;
ls->protocol = IPPROTO_IP;
#if (WIN32)
ls->flags = WSA_FLAG_OVERLAPPED;
#endif
ls->sockaddr = (struct sockaddr *) addr_in;
ls->socklen = sizeof(struct sockaddr_in);
ls->addr = offsetof(struct sockaddr_in, sin_addr);
ls->addr_text_max_len = INET_ADDRSTRLEN;
return ls;
}端口、地址、servername处理完后的内存视图如下。
在这里插入图片描述
