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hande IF_NONE_MATCH in /wire request

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This commit is contained in:
Christian Grothoff 2022-05-12 14:27:31 +02:00
parent d0a0bd9725
commit 6518cc20dd
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GPG Key ID: 939E6BE1E29FC3CC
1 changed files with 59 additions and 9 deletions
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68
src/exchange/taler-exchange-httpd_wire.c
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@ -76,6 +76,11 @@ struct WireStateHandle
*/
struct MHD_Response *wire_reply;
/**
* ETag for this response (if any).
*/
char *etag;
/**
* head of DLL of wire fees.
*/
@ -86,6 +91,16 @@ struct WireStateHandle
*/
struct WireFeeSet *wfs_tail;
/**
* Earliest timestamp of all the wire methods when we have no more fees.
*/
struct GNUNET_TIME_Absolute cache_expiration;
/**
* @e cache_expiration time, formatted.
*/
char dat[128];
/**
* For which (global) wire_generation was this data structure created?
* Used to check when we are outdated and need to be re-generated.
@ -336,7 +351,6 @@ build_wire_state (void)
uint64_t wg = wire_generation; /* must be obtained FIRST */
enum GNUNET_DB_QueryStatus qs;
struct WireStateHandle *wsh;
struct GNUNET_TIME_Absolute cache_expiration;
struct GNUNET_HashContext *hc;
wsh = GNUNET_new (struct WireStateHandle);
@ -367,7 +381,7 @@ build_wire_state (void)
}
wire_fee_object = json_object ();
GNUNET_assert (NULL != wire_fee_object);
cache_expiration = GNUNET_TIME_UNIT_ZERO_ABS;
wsh->cache_expiration = GNUNET_TIME_UNIT_ZERO_ABS;
hc = GNUNET_CRYPTO_hash_context_start ();
{
json_t *account;
@ -434,8 +448,8 @@ build_wire_state (void)
GNUNET_CRYPTO_hash_context_abort (hc);
return wsh;
}
cache_expiration = GNUNET_TIME_absolute_min (ac.max_seen,
cache_expiration);
wsh->cache_expiration = GNUNET_TIME_absolute_min (ac.max_seen,
wsh->cache_expiration);
GNUNET_assert (0 ==
json_object_set_new (wire_fee_object,
wire_method,
@ -454,19 +468,18 @@ build_wire_state (void)
GNUNET_JSON_pack_data_auto ("master_public_key",
&TEH_master_public_key));
{
char dat[128];
struct GNUNET_TIME_Timestamp m;
m = GNUNET_TIME_absolute_to_timestamp (cache_expiration);
m = GNUNET_TIME_absolute_to_timestamp (wsh->cache_expiration);
TALER_MHD_get_date_string (m.abs_time,
dat);
wsh->dat);
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Setting 'Expires' header for '/wire' to '%s'\n",
dat);
wsh->dat);
GNUNET_break (MHD_YES ==
MHD_add_response_header (wsh->wire_reply,
MHD_HTTP_HEADER_EXPIRES,
dat));
wsh->dat));
}
TALER_MHD_add_global_headers (wsh->wire_reply);
{
@ -481,6 +494,7 @@ build_wire_state (void)
etag,
sizeof (etag));
*end = '\0';
wsh->etag = GNUNET_strdup (etag);
GNUNET_break (MHD_YES ==
MHD_add_response_header (wsh->wire_reply,
MHD_HTTP_HEADER_ETAG,
@ -550,6 +564,42 @@ TEH_handler_wire (struct TEH_RequestContext *rc,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_EXCHANGE_GENERIC_BAD_CONFIGURATION,
NULL);
{
const char *etag;
etag = MHD_lookup_connection_value (rc->connection,
MHD_HEADER_KIND,
MHD_HTTP_HEADER_IF_NONE_MATCH);
if ( (NULL != etag) &&
(MHD_HTTP_OK == wsh->http_status) &&
(NULL != wsh->etag) &&
(0 == strcmp (etag,
wsh->etag)) )
{
MHD_RESULT ret;
struct MHD_Response *resp;
resp = MHD_create_response_from_buffer (0,
NULL,
MHD_RESPMEM_PERSISTENT);
TALER_MHD_add_global_headers (resp);
GNUNET_break (MHD_YES ==
MHD_add_response_header (resp,
MHD_HTTP_HEADER_EXPIRES,
wsh->dat));
GNUNET_break (MHD_YES ==
MHD_add_response_header (resp,
MHD_HTTP_HEADER_ETAG,
wsh->etag));
ret = MHD_queue_response (rc->connection,
MHD_HTTP_NOT_MODIFIED,
resp);
GNUNET_break (MHD_YES == ret);
MHD_destroy_response (resp);
return ret;
}
}
return MHD_queue_response (rc->connection,
wsh->http_status,
wsh->wire_reply);