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Clarify and degrade FastCGI multiplexing

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No need to support more than 255 concurrent requests on one connection.
This commit is contained in:
Přemysl Eric Janouch 2018-10-15 03:02:49 +02:00
parent 8b334e9c91
commit 14ded260a0
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 15 additions and 13 deletions
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28
demo-json-rpc-server.c
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@ -124,10 +124,6 @@ struct fcgi_muxer
// TODO: bool quitting; that causes us to reject all requests?
/// Requests assigned to request IDs
// TODO: allocate this dynamically
struct fcgi_request *requests[1 << 16];
void (*write_cb) (void *user_data, const void *data, size_t len);
void (*close_cb) (void *user_data);
@ -136,6 +132,9 @@ struct fcgi_muxer
void (*request_destroy_cb) (void *handler_data);
void *user_data; ///< User data for callbacks
/// Requests assigned to request IDs (may not be FCGI_NULL_REQUEST_ID)
struct fcgi_request *requests[1 << 8];
};
static void
@ -284,18 +283,21 @@ fcgi_muxer_on_get_values
nv_parser.output = &values;
fcgi_nv_parser_push (&nv_parser, parser->content.str, parser->content.len);
const char *key = NULL;
struct str_map_iter iter = str_map_iter_make (&values);
while (str_map_iter_next (&iter))
{
const char *key = iter.link->key;
// No real-world servers seem to actually use multiplexing
// or even issue this request, but we will implement it anyway
if (str_map_find (&values, (key = FCGI_MPXS_CONNS)))
str_map_set (&response, key, xstrdup ("1"));
// TODO: if (!strcmp (key, FCGI_MAX_CONNS))
// TODO: if (!strcmp (key, FCGI_MAX_REQS))
// It's not clear whether FCGI_MAX_REQS means concurrently over all
// connections or over just a single connection (multiplexed), though
// supposedly it's actually per /web server/. Supply the strictest limit.
if (str_map_find (&values, (key = FCGI_MAX_REQS)))
str_map_set (&response, key,
xstrdup_printf ("%zu", N_ELEMENTS (self->requests) - 1));
if (!strcmp (key, FCGI_MPXS_CONNS))
str_map_set (&response, key, xstrdup ("1"));
}
// FCGI_MAX_CONNS would be basically infinity. We don't limit connections.
struct str content = str_make ();
fcgi_nv_convert (&response, &content);