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Variable $request_id.

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The variable contains text representation based on random data, usable as
a unique request identifier.
This commit is contained in:
Vladimir Homutov 2016-04-26 19:31:46 +03:00
parent be79f5cb16
commit f315b7a924
1 changed files with 47 additions and 0 deletions
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47
src/http/ngx_http_variables.c
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@ -98,6 +98,8 @@ static ngx_int_t ngx_http_variable_request_length(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_request_time(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_request_id(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_variable_status(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
@ -274,6 +276,10 @@ static ngx_http_variable_t ngx_http_core_variables[] = {
{ ngx_string("request_time"), NULL, ngx_http_variable_request_time,
0, NGX_HTTP_VAR_NOCACHEABLE, 0 },
{ ngx_string("request_id"), NULL,
ngx_http_variable_request_id,
0, 0, 0 },
{ ngx_string("status"), NULL,
ngx_http_variable_status, 0,
NGX_HTTP_VAR_NOCACHEABLE, 0 },
@ -2067,6 +2073,47 @@ ngx_http_variable_request_time(ngx_http_request_t *r,
}
static ngx_int_t
ngx_http_variable_request_id(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{
u_char *id;
#if (NGX_OPENSSL)
u_char random_bytes[16];
#endif
id = ngx_pnalloc(r->pool, 32);
if (id == NULL) {
return NGX_ERROR;
}
v->valid = 1;
v->no_cacheable = 0;
v->not_found = 0;
v->len = 32;
v->data = id;
#if (NGX_OPENSSL)
if (RAND_bytes(random_bytes, 16) == 1) {
ngx_hex_dump(id, random_bytes, 16);
return NGX_OK;
}
ngx_ssl_error(NGX_LOG_ERR, r->connection->log, 0, "RAND_bytes() failed");
#endif
ngx_sprintf(id, "%08xD%08xD%08xD%08xD",
(uint32_t) ngx_random(), (uint32_t) ngx_random(),
(uint32_t) ngx_random(), (uint32_t) ngx_random());
return NGX_OK;
}
static ngx_int_t
ngx_http_variable_connection(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)