[PATCH 1 of 2] QUIC: allowed main QUIC connection for some operations

[Sergey Kandaurov]

> On 21 Oct 2021, at 16:40, Roman Arutyunyan <arut at nginx.com> wrote:
> 
> # HG changeset patch
> # User Roman Arutyunyan <arut at nginx.com>
> # Date 1634219818 -10800
> #      Thu Oct 14 16:56:58 2021 +0300
> # Branch quic
> # Node ID 8b049432ef2dcdb8d1a8ec1a5e41c0a340285b65
> # Parent  404de224517e33f685613d6425dcdb3c8ef5b97e
> QUIC: allowed main QUIC connection for some operations.
> 
> Operations like ngx_quic_open_stream(), ngx_http_quic_get_connection(),
> ngx_http_v3_finalize_connection(), ngx_http_v3_shutdown_connection() used to
> receive a QUIC stream connection.  Now they can receive the main QUIC
> connection as well.  This is useful when calling them out of a stream context.
> 
> diff --git a/src/event/quic/ngx_event_quic_streams.c b/src/event/quic/ngx_event_quic_streams.c
> --- a/src/event/quic/ngx_event_quic_streams.c
> +++ b/src/event/quic/ngx_event_quic_streams.c
> @@ -35,11 +35,12 @@ ngx_connection_t *
> ngx_quic_open_stream(ngx_connection_t *c, ngx_uint_t bidi)
> {
>     uint64_t                id;
> -    ngx_quic_stream_t      *qs, *nqs;
> +    ngx_connection_t       *pc;
> +    ngx_quic_stream_t      *nqs;
>     ngx_quic_connection_t  *qc;
> 
> -    qs = c->quic;
> -    qc = ngx_quic_get_connection(qs->parent);
> +    pc = c->quic ? c->quic->parent : c;
> +    qc = ngx_quic_get_connection(pc);

is it really needed?

> 
>     if (bidi) {
>         if (qc->streams.server_streams_bidi
> @@ -85,7 +86,7 @@ ngx_quic_open_stream(ngx_connection_t *c
>         qc->streams.server_streams_uni++;
>     }
> 
> -    nqs = ngx_quic_create_stream(qs->parent, id);
> +    nqs = ngx_quic_create_stream(pc, id);
>     if (nqs == NULL) {
>         return NULL;
>     }
> diff --git a/src/http/modules/ngx_http_quic_module.h b/src/http/modules/ngx_http_quic_module.h
> --- a/src/http/modules/ngx_http_quic_module.h
> +++ b/src/http/modules/ngx_http_quic_module.h
> @@ -19,7 +19,8 @@
> 
> 
> #define ngx_http_quic_get_connection(c)                                       \
> -    ((ngx_http_connection_t *) (c)->quic->parent->data)
> +    ((ngx_http_connection_t *) ((c)->quic ? (c)->quic->parent->data           \
> +                                          : (c)->data))
> 

Looks like this is the only change useful in the 2nd patch.
To avoid it, ngx_http_v3_inc_insert_count_handler() could get h3c from
the decoder stream, but ngx_http_v3_get_uni_stream() isn't external.

> 
> ngx_int_t ngx_http_quic_init(ngx_connection_t *c);
> diff --git a/src/http/v3/ngx_http_v3.c b/src/http/v3/ngx_http_v3.c
> --- a/src/http/v3/ngx_http_v3.c
> +++ b/src/http/v3/ngx_http_v3.c
> @@ -70,8 +70,8 @@ ngx_http_v3_keepalive_handler(ngx_event_
> 
>     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http3 keepalive handler");
> 
> -    ngx_quic_finalize_connection(c, NGX_HTTP_V3_ERR_NO_ERROR,
> -                                 "keepalive timeout");
> +    ngx_http_v3_finalize_connection(c, NGX_HTTP_V3_ERR_NO_ERROR,
> +                                    "keepalive timeout");
> }
> 
> 
> diff --git a/src/http/v3/ngx_http_v3.h b/src/http/v3/ngx_http_v3.h
> --- a/src/http/v3/ngx_http_v3.h
> +++ b/src/http/v3/ngx_http_v3.h
> @@ -85,10 +85,12 @@
>                                  module)
> 
> #define ngx_http_v3_finalize_connection(c, code, reason)                      \
> -    ngx_quic_finalize_connection(c->quic->parent, code, reason)
> +    ngx_quic_finalize_connection((c)->quic ? (c)->quic->parent : (c),         \
> +                                 code, reason)
> 
> #define ngx_http_v3_shutdown_connection(c, code, reason)                      \
> -    ngx_quic_shutdown_connection(c->quic->parent, code, reason)
> +    ngx_quic_shutdown_connection((c)->quic ? (c)->quic->parent : (c),         \
> +                                 code, reason)
> 
> 
> typedef struct {

-- 
Sergey Kandaurov