static ngx_int_t

ngx_http_static_init(ngx_conf_t *cf)

{

ngx_http_handler_pt *h;

ngx_http_core_main_conf_t *cmcf;

cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);

h = ngx_array_push(&cmcf->phases[NGX_HTTP_CONTENT_PHASE].handlers);

if (h == NULL) {

return NGX_ERROR;

}

*h = ngx_http_static_handler;

return NGX_OK;

}

仅仅是挂载这个handler到NGX_HTTP_CONTENT_PHASE处理阶段。简单吧？

下面我们就看一下这个模块最核心的处理逻辑所在的ngx_http_static_handler函数。该函数大概占了这个模块代码量的百分之八九十。

static ngx_int_t

ngx_http_static_handler(ngx_http_request_t *r)

{

u_char *last, *location;

size_t root, len;

ngx_str_t path;

ngx_int_t rc;

ngx_uint_t level;

ngx_log_t *log;

ngx_buf_t *b;

ngx_chain_t out;

ngx_open_file_info_t of;

ngx_http_core_loc_conf_t *clcf;

if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD|NGX_HTTP_POST))) {

return NGX_HTTP_NOT_ALLOWED;

}

if (r->uri.data[r->uri.len - 1] == '/') {

return NGX_DECLINED;

}

log = r->connection->log;

/*

* ngx_http_map_uri_to_path() allocates memory for terminating '\0'

* so we do not need to reserve memory for '/' for possible redirect

*/

last = ngx_http_map_uri_to_path(r, &path, &root, 0);

if (last == NULL) {

return NGX_HTTP_INTERNAL_SERVER_ERROR;

}

path.len = last - path.data;

ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0,

"http filename: \"%s\"", path.data);

clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);

ngx_memzero(&of, sizeof(ngx_open_file_info_t));

of.read_ahead = clcf->read_ahead;

of.directio = clcf->directio;

of.valid = clcf->open_file_cache_valid;

of.min_uses = clcf->open_file_cache_min_uses;

of.errors = clcf->open_file_cache_errors;

of.events = clcf->open_file_cache_events;

if (ngx_http_set_disable_symlinks(r, clcf, &path, &of) != NGX_OK) {

return NGX_HTTP_INTERNAL_SERVER_ERROR;

}

if (ngx_open_cached_file(clcf->open_file_cache, &path, &of, r->pool)

!= NGX_OK)

{

switch (of.err) {

case 0:

return NGX_HTTP_INTERNAL_SERVER_ERROR;

case NGX_ENOENT:

case NGX_ENOTDIR:

case NGX_ENAMETOOLONG:

level = NGX_LOG_ERR;

rc = NGX_HTTP_NOT_FOUND;

break;

case NGX_EACCES:

#if (NGX_HAVE_OPENAT)

case NGX_EMLINK:

case NGX_ELOOP:

#endif

level = NGX_LOG_ERR;

rc = NGX_HTTP_FORBIDDEN;

break;

default:

level = NGX_LOG_CRIT;

rc = NGX_HTTP_INTERNAL_SERVER_ERROR;

break;

}

if (rc != NGX_HTTP_NOT_FOUND || clcf->log_not_found) {

ngx_log_error(level, log, of.err,

"%s \"%s\" failed", of.failed, path.data);

}

return rc;

}

r->root_tested = !r->error_page;

ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0, "http static fd: %d", of.fd);

if (of.is_dir) {

ngx_log_debug0(NGX_LOG_DEBUG_HTTP, log, 0, "http dir");

ngx_http_clear_location(r);

r->headers_out.location = ngx_palloc(r->pool, sizeof(ngx_table_elt_t));

if (r->headers_out.location == NULL) {

return NGX_HTTP_INTERNAL_SERVER_ERROR;

}

len = r->uri.len + 1;

if (!clcf->alias && clcf->root_lengths == NULL && r->args.len == 0) {

location = path.data + clcf->root.len;

*last = '/';

} else {

if (r->args.len) {

len += r->args.len + 1;

}

location = ngx_pnalloc(r->pool, len);

if (location == NULL) {

return NGX_HTTP_INTERNAL_SERVER_ERROR;

}

last = ngx_copy(location, r->uri.data, r->uri.len);

*last = '/';

if (r->args.len) {

*++last = '?';

ngx_memcpy(++last, r->args.data, r->args.len);

}

}

/*

* we do not need to set the r->headers_out.location->hash and

* r->headers_out.location->key fields

*/

r->headers_out.location->value.len = len;

r->headers_out.location->value.data = location;

return NGX_HTTP_MOVED_PERMANENTLY;

}

#if !(NGX_WIN32) /* the not regular files are probably Unix specific */

if (!of.is_file) {

ngx_log_error(NGX_LOG_CRIT, log, 0,

"\"%s\" is not a regular file", path.data);

return NGX_HTTP_NOT_FOUND;

}

#endif

if (r->method & NGX_HTTP_POST) {

return NGX_HTTP_NOT_ALLOWED;

}

rc = ngx_http_discard_request_body(r);

if (rc != NGX_OK) {

return rc;

}

log->action = "sending response to client";

r->headers_out.status = NGX_HTTP_OK;

r->headers_out.content_length_n = of.size;

r->headers_out.last_modified_time = of.mtime;

if (ngx_http_set_content_type(r) != NGX_OK) {

return NGX_HTTP_INTERNAL_SERVER_ERROR;

}

if (r != r->main && of.size == 0) {

return ngx_http_send_header(r);

}

r->allow_ranges = 1;

/* we need to allocate all before the header would be sent */

b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));

if (b == NULL) {

return NGX_HTTP_INTERNAL_SERVER_ERROR;

}

b->file = ngx_pcalloc(r->pool, sizeof(ngx_file_t));

if (b->file == NULL) {

return NGX_HTTP_INTERNAL_SERVER_ERROR;

}

rc = ngx_http_send_header(r);

if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {

return rc;

}

b->file_pos = 0;

b->file_last = of.size;

b->in_file = b->file_last ? 1: 0;

b->last_buf = (r == r->main) ? 1: 0;

b->last_in_chain = 1;

b->file->fd = of.fd;

b->file->name = path;

b->file->log = log;

b->file->directio = of.is_directio;

out.buf = b;

out.next = NULL;

return ngx_http_output_filter(r, &out);

}