Re: [PATCH v2 05/11] serve: provide "receive" function for session-id capability

> Rather than pulling the session-id string from the list of collected
> capabilities, we can handle it as soon as we receive it. This gets us
> closer to dropping the collected list entirely.
>
> The behavior should be the same, with one exception. Previously if the
> client sent us multiple session-id lines, we'd report only the first.
> Now we'll pass each one along to trace2. This shouldn't matter in
> practice, since clients shouldn't do that (and if they do, it's probably
> sensible to log them all).
>
> As this removes the last caller of the static has_capability(), we can
> remove it, as well (and in fact we must to avoid -Wunused-function
> complaining).

>
> Signed-off-by: Jeff King <peff@peff.net>
> ---
>  serve.c | 33 +++++++++------------------------
>  1 file changed, 9 insertions(+), 24 deletions(-)
>
> diff --git a/serve.c b/serve.c
> index f6ea2953eb..6bbf54cbbe 100644
> --- a/serve.c
> +++ b/serve.c
> @@ -57,6 +57,14 @@ static int session_id_advertise(struct repository *r, struct strbuf *value)
>  	return 1;
>  }
>  
> +static void session_id_receive(struct repository *r,
> +			       const char *client_sid)
> +{
> +	if (!client_sid)
> +		client_sid = "";
> +	trace2_data_string("transfer", NULL, "client-sid", client_sid);
> +}
> +
>  struct protocol_capability {
>  	/*
>  	 * The name of the capability.  The server uses this name when
> @@ -121,6 +129,7 @@ static struct protocol_capability capabilities[] = {
>  	{
>  		.name = "session-id",
>  		.advertise = session_id_advertise,
> +		.receive = session_id_receive,
>  	},
>  	{
>  		.name = "object-info",
> @@ -221,26 +230,6 @@ static int parse_command(const char *key, struct protocol_capability **command)
>  	return 0;
>  }
>  
> -static int has_capability(const struct strvec *keys, const char *capability,
> -			  const char **value)
> -{
> -	int i;
> -	for (i = 0; i < keys->nr; i++) {
> -		const char *out;
> -		if (skip_prefix(keys->v[i], capability, &out) &&
> -		    (!*out || *out == '=')) {
> -			if (value) {
> -				if (*out == '=')
> -					out++;
> -				*value = out;
> -			}
> -			return 1;
> -		}
> -	}
> -
> -	return 0;
> -}
> -
>  enum request_state {
>  	PROCESS_REQUEST_KEYS,
>  	PROCESS_REQUEST_DONE,
> @@ -252,7 +241,6 @@ static int process_request(void)
>  	struct packet_reader reader;
>  	struct strvec keys = STRVEC_INIT;
>  	struct protocol_capability *command = NULL;
> -	const char *client_sid;
>  
>  	packet_reader_init(&reader, 0, NULL, 0,
>  			   PACKET_READ_CHOMP_NEWLINE |
> @@ -319,9 +307,6 @@ static int process_request(void)
>  		    the_repository->hash_algo->name,
>  		    hash_algos[client_hash_algo].name);
>  
> -	if (has_capability(&keys, "session-id", &client_sid))
> -		trace2_data_string("transfer", NULL, "client-sid", client_sid);
> -
>  	command->command(the_repository, &reader);
>  
>  	strvec_clear(&keys);