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implement rh caching

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This commit is contained in:
Christian Grothoff 2020-01-17 12:52:24 +01:00
parent 153dcdbc61
commit 540b22ce1c
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GPG Key ID: 939E6BE1E29FC3CC
4 changed files with 185 additions and 78 deletions
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28
src/exchange/taler-exchange-httpd.c
View File

@ -66,6 +66,11 @@ struct ExchangeHttpRequestClosure
* Opaque parsing context.
*/
void *opaque_post_parsing_context;
/**
* Cached request handler for this request (once we have found one).
*/
struct TEH_RequestHandler *rh;
};
@ -360,7 +365,6 @@ handle_mhd_request (void *cls,
"<html><title>404: not found</title></html>", 0,
&TEH_MHD_handler_static_response, MHD_HTTP_NOT_FOUND
};
struct TEH_RequestHandler *rh;
struct ExchangeHttpRequestClosure *ecls = *con_cls;
int ret;
void **inner_cls;
@ -413,18 +417,28 @@ handle_mhd_request (void *cls,
"Handling request (%s) for URL '%s'\n",
method,
url);
/* on repeated requests, check our cache first */
if (NULL != ecls->rh)
{
ret = ecls->rh->handler (ecls->rh,
connection,
inner_cls,
upload_data,
upload_data_size);
GNUNET_async_scope_restore (&old_scope);
return ret;
}
if (0 == strcasecmp (method,
MHD_HTTP_METHOD_HEAD))
method = MHD_HTTP_METHOD_GET; /* treat HEAD as GET here, MHD will do the rest */
for (unsigned int i = 0; NULL != handlers[i].url; i++)
{
rh = &handlers[i];
struct TEH_RequestHandler *rh = &handlers[i];
if (0 != strcmp (url, rh->url))
continue;
/* The URL is a match! What we now do depends on the method. */
if (0 == strcasecmp (method, MHD_HTTP_METHOD_OPTIONS))
{
GNUNET_async_scope_restore (&old_scope);
@ -435,8 +449,9 @@ handle_mhd_request (void *cls,
(0 == strcasecmp (method,
rh->method)) )
{
/* FIXME: consider caching 'rh' in '**connection_cls' to
avoid repeated lookup! */
/* cache to avoid the loop next time */
ecls->rh = rh;
/* run handler */
ret = rh->handler (rh,
connection,
inner_cls,
@ -446,6 +461,7 @@ handle_mhd_request (void *cls,
return ret;
}
}
/* No handler matches, generate not found */
ret = TEH_MHD_handler_static_response (&h404,
connection,
inner_cls,

169
src/exchange/taler-exchange-httpd_refund.c
View File

@ -1,6 +1,6 @@
/*
This file is part of TALER
Copyright (C) 2014-2017 Inria and GNUnet e.V.
Copyright (C) 2014-2020 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License as published by the Free Software
@ -131,6 +131,24 @@ reply_refund_conflict (struct MHD_Connection *connection,
}
/**
* Closure for the transaction.
*/
struct TALER_EXCHANGEDB_RefundContext
{
/**
* Information about the refund.
*/
const struct TALER_EXCHANGEDB_Refund *refund;
/**
* Expected refund fee by the denomination of the coin.
*/
struct TALER_Amount expect_fee;
};
/**
* Execute a "/refund" transaction. Returns a confirmation that the
* refund was successful, or a failure if we are not aware of a
@ -155,20 +173,15 @@ refund_transaction (void *cls,
struct TALER_EXCHANGEDB_Session *session,
int *mhd_ret)
{
const struct TALER_EXCHANGEDB_Refund *refund = cls;
struct TALER_EXCHANGEDB_RefundContext *rc = cls;
const struct TALER_EXCHANGEDB_Refund *refund = rc->refund;
struct TALER_EXCHANGEDB_TransactionList *tl;
const struct TALER_EXCHANGEDB_DepositListEntry *dep;
const struct TALER_EXCHANGEDB_RefundListEntry *ref;
struct TEH_KS_StateHandle *mks;
struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki;
struct TALER_Amount expect_fee;
enum GNUNET_DB_QueryStatus qs;
int deposit_found;
int refund_found;
int fee_cmp;
unsigned int hc;
enum TALER_ErrorCode ec;
struct TALER_CoinPublicInfo coin_info;
dep = NULL;
ref = NULL;
@ -356,64 +369,9 @@ refund_transaction (void *cls,
TALER_EC_REFUND_INSUFFICIENT_FUNDS);
return GNUNET_DB_STATUS_HARD_ERROR;
}
qs = TEH_plugin->get_known_coin (TEH_plugin->cls,
session,
&refund->coin.coin_pub,
&coin_info);
if (0 > qs)
{
TEH_plugin->free_coin_transaction_list (TEH_plugin->cls,
tl);
if (GNUNET_DB_STATUS_HARD_ERROR == qs)
{
GNUNET_break (0); /* should be impossible by foreign key constraint! */
*mhd_ret = reply_refund_failure (connection,
MHD_HTTP_NOT_FOUND,
TALER_EC_REFUND_COIN_NOT_FOUND);
}
return qs;
}
GNUNET_CRYPTO_rsa_signature_free (coin_info.denom_sig.rsa_signature);
coin_info.denom_sig.rsa_signature = NULL; /* just to be safe */
// FIXME: do this outside of transaction function?
/* Check refund fee matches fee of denomination key! */
mks = TEH_KS_acquire (GNUNET_TIME_absolute_get ());
if (NULL == mks)
{
TALER_LOG_ERROR ("Lacking keys to operate\n");
TEH_plugin->free_coin_transaction_list (TEH_plugin->cls,
tl);
*mhd_ret = TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_EXCHANGE_BAD_CONFIGURATION,
"no keys");
return GNUNET_DB_STATUS_HARD_ERROR;
}
dki = TEH_KS_denomination_key_lookup_by_hash (mks,
&coin_info.denom_pub_hash,
TEH_KS_DKU_DEPOSIT,
&ec,
&hc);
if (NULL == dki)
{
/* DKI not found, but we do have a coin with this DK in our database;
not good... */
GNUNET_break (0);
TEH_KS_release (mks);
TEH_plugin->free_coin_transaction_list (TEH_plugin->cls,
tl);
*mhd_ret = TALER_MHD_reply_with_error (connection,
hc,
ec,
"denomination not found, but coin known");
return GNUNET_DB_STATUS_HARD_ERROR;
}
TALER_amount_ntoh (&expect_fee,
&dki->issue.properties.fee_refund);
fee_cmp = TALER_amount_cmp (&refund->details.refund_fee,
&expect_fee);
TEH_KS_release (mks);
&rc->expect_fee);
if (-1 == fee_cmp)
{
TEH_plugin->free_coin_transaction_list (TEH_plugin->cls,
@ -464,8 +422,9 @@ static int
verify_and_execute_refund (struct MHD_Connection *connection,
const struct TALER_EXCHANGEDB_Refund *refund)
{
struct TALER_EXCHANGEDB_RefundContext rc;
struct TALER_RefundRequestPS rr;
int mhd_ret;
struct GNUNET_HashCode denom_hash;
if (GNUNET_YES !=
TALER_amount_cmp_currency (&refund->details.refund_amount,
@ -508,13 +467,79 @@ verify_and_execute_refund (struct MHD_Connection *connection,
TALER_EC_REFUND_MERCHANT_SIGNATURE_INVALID,
"merchant_sig");
}
if (GNUNET_OK !=
TEH_DB_run_transaction (connection,
"run refund",
&mhd_ret,
&refund_transaction,
(void *) refund))
return mhd_ret;
/* Fetch the coin's denomination (hash) */
{
enum GNUNET_DB_QueryStatus qs;
qs = TEH_plugin->get_coin_denomination (TEH_plugin->cls,
NULL,
&refund->coin.coin_pub,
&denom_hash);
if (0 > qs)
{
GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR == qs);
return reply_refund_failure (connection,
MHD_HTTP_NOT_FOUND,
TALER_EC_REFUND_COIN_NOT_FOUND);
}
}
{
struct TEH_KS_StateHandle *mks;
mks = TEH_KS_acquire (GNUNET_TIME_absolute_get ());
if (NULL == mks)
{
TALER_LOG_ERROR ("Lacking keys to operate\n");
return TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_EXCHANGE_BAD_CONFIGURATION,
"no keys");
}
/* Obtain information about the coin's denomination! */
{
struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki;
unsigned int hc;
enum TALER_ErrorCode ec;
dki = TEH_KS_denomination_key_lookup_by_hash (mks,
&denom_hash,
TEH_KS_DKU_DEPOSIT,
&ec,
&hc);
if (NULL == dki)
{
/* DKI not found, but we do have a coin with this DK in our database;
not good... */
GNUNET_break (0);
TEH_KS_release (mks);
return TALER_MHD_reply_with_error (connection,
hc,
ec,
"denomination not found, but coin known");
}
TALER_amount_ntoh (&rc.expect_fee,
&dki->issue.properties.fee_refund);
}
TEH_KS_release (mks);
}
/* Finally run the actual transaction logic */
{
int mhd_ret;
rc.refund = refund;
if (GNUNET_OK !=
TEH_DB_run_transaction (connection,
"run refund",
&mhd_ret,
&refund_transaction,
&rc))
{
return mhd_ret;
}
}
return reply_refund_success (connection,
&refund->coin.coin_pub,
&refund->details);

49
src/exchangedb/plugin_exchangedb_postgres.c
View File

@ -550,6 +550,15 @@ postgres_get_session (void *cls)
" WHERE coin_pub=$1"
" FOR UPDATE;",
1),
/* Used in #postgres_get_coin_denomination() to fetch
the denomination public key hash for
a coin known to the exchange. */
GNUNET_PQ_make_prepare ("get_coin_denomination",
"SELECT"
" denom_pub_hash"
" FROM known_coins"
" WHERE coin_pub=$1",
1),
/* Lock deposit table; NOTE: we may want to eventually shard the
deposit table to avoid this lock being the main point of
contention limiting transaction performance. */
@ -3007,6 +3016,45 @@ postgres_get_known_coin (void *cls,
}
/**
* Retrieve the denomination of a known coin.
*
* @param cls the plugin closure
* @param session the database session handle
* @param coin_pub the public key of the coin to search for
* @param denom_hash[out] where to store the hash of the coins denomination
* @return transaction status code
*/
static enum GNUNET_DB_QueryStatus
postgres_get_coin_denomination (void *cls,
struct TALER_EXCHANGEDB_Session *session,
const struct
TALER_CoinSpendPublicKeyP *coin_pub,
struct GNUNET_HashCode *denom_hash)
{
struct PostgresClosure *pc = cls;
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_auto_from_type (coin_pub),
GNUNET_PQ_query_param_end
};
struct GNUNET_PQ_ResultSpec rs[] = {
GNUNET_PQ_result_spec_auto_from_type ("denom_pub_hash",
denom_hash),
GNUNET_PQ_result_spec_end
};
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Getting coin denomination of coin %s\n",
TALER_B2S (coin_pub));
if (NULL == session)
session = postgres_get_session (pc);
return GNUNET_PQ_eval_prepared_singleton_select (session->conn,
"get_coin_denomination",
params,
rs);
}
/**
* Insert a coin we know of into the DB. The coin can then be
* referenced by tables for deposits, refresh and refund
@ -7263,6 +7311,7 @@ libtaler_plugin_exchangedb_postgres_init (void *cls)
plugin->count_known_coins = &postgres_count_known_coins;
plugin->ensure_coin_known = &postgres_ensure_coin_known;
plugin->get_known_coin = &postgres_get_known_coin;
plugin->get_coin_denomination = &postgres_get_coin_denomination;
plugin->have_deposit = &postgres_have_deposit;
plugin->mark_deposit_tiny = &postgres_mark_deposit_tiny;
plugin->test_deposit_done = &postgres_test_deposit_done;

17
src/include/taler_exchangedb_plugin.h
View File

@ -1884,6 +1884,23 @@ struct TALER_EXCHANGEDB_Plugin
const struct TALER_CoinSpendPublicKeyP *coin_pub,
struct TALER_CoinPublicInfo *coin_info);
/**
* Retrieve the denomination of a known coin.
*
* @param cls the plugin closure
* @param session the database session handle
* @param coin_pub the public key of the coin to search for
* @param denom_hash[out] where to store the hash of the coins denomination
* @return transaction status code
*/
enum GNUNET_DB_QueryStatus
(*get_coin_denomination)(void *cls,
struct TALER_EXCHANGEDB_Session *session,
const struct TALER_CoinSpendPublicKeyP *coin_pub,
struct GNUNET_HashCode *denom_hash);
/**
* Check if we have the specified deposit already in the database.
*