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authorChristian Grothoff <christian@grothoff.org>2017-06-20 13:40:17 +0200
committerChristian Grothoff <christian@grothoff.org>2017-06-20 13:40:17 +0200
commit39db1ae5dbbd12c0f452cfa56119d9a95f9b1b22 (patch)
treed1d04891fc363c7df78b42d9224d979b30bf971a /src
parent247f82c088dd1575709a676ab87555514fa6445e (diff)
downloadexchange-39db1ae5dbbd12c0f452cfa56119d9a95f9b1b22.tar.gz
exchange-39db1ae5dbbd12c0f452cfa56119d9a95f9b1b22.tar.bz2
exchange-39db1ae5dbbd12c0f452cfa56119d9a95f9b1b22.zip
address #5010 for /refresh/link
Diffstat (limited to 'src')
-rw-r--r--src/exchange/taler-exchange-httpd_refresh_link.c172
-rw-r--r--src/exchangedb/plugin_exchangedb_postgres.c229
-rw-r--r--src/exchangedb/test_exchangedb.c11
-rw-r--r--src/include/taler_exchangedb_plugin.h14
4 files changed, 264 insertions, 162 deletions
diff --git a/src/exchange/taler-exchange-httpd_refresh_link.c b/src/exchange/taler-exchange-httpd_refresh_link.c
index c85431f0..0be69984 100644
--- a/src/exchange/taler-exchange-httpd_refresh_link.c
+++ b/src/exchange/taler-exchange-httpd_refresh_link.c
@@ -56,6 +56,11 @@ struct HTD_Context
{
/**
+ * Public key of the coin that we are tracing.
+ */
+ struct TALER_CoinSpendPublicKeyP coin_pub;
+
+ /**
* Session link data we collect.
*/
struct TEH_RESPONSE_LinkSessionInfo *sessions;
@@ -100,18 +105,18 @@ reply_refresh_link_success (struct MHD_Connection *connection,
unsigned int num_sessions,
const struct TEH_RESPONSE_LinkSessionInfo *sessions)
{
- json_t *root;
json_t *mlist;
int res;
- unsigned int i;
mlist = json_array ();
- for (i=0;i<num_sessions;i++)
+ for (unsigned int i=0;i<num_sessions;i++)
{
- const struct TALER_EXCHANGEDB_LinkDataList *pos;
json_t *list = json_array ();
+ json_t *root;
- for (pos = sessions[i].ldl; NULL != pos; pos = pos->next)
+ for (const struct TALER_EXCHANGEDB_LinkDataList *pos = sessions[i].ldl;
+ NULL != pos;
+ pos = pos->next)
{
json_t *obj;
@@ -163,24 +168,24 @@ handle_transfer_data (void *cls,
struct HTD_Context *ctx = cls;
struct TALER_EXCHANGEDB_LinkDataList *ldl;
struct TEH_RESPONSE_LinkSessionInfo *lsi;
+ enum GNUNET_DB_QueryStatus qs;
- if (GNUNET_OK != ctx->status)
+ if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT != ctx->status)
return;
- ldl = TEH_plugin->get_link_data_list (TEH_plugin->cls,
- ctx->session,
- session_hash);
- if (NULL == ldl)
+ ldl = NULL;
+ qs = TEH_plugin->get_link_data_list (TEH_plugin->cls,
+ ctx->session,
+ session_hash,
+ &ldl);
+ if (qs <= 0)
{
- ctx->status = GNUNET_NO;
- if (MHD_NO ==
- TEH_RESPONSE_reply_json_pack (ctx->connection,
- MHD_HTTP_NOT_FOUND,
- "{s:s}",
- "error",
- "link data not found (link)"))
- ctx->status = GNUNET_SYSERR;
+ if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
+ ctx->status = GNUNET_DB_STATUS_HARD_ERROR;
+ else
+ ctx->status = qs;
return;
}
+ GNUNET_assert (NULL != ldl);
GNUNET_array_grow (ctx->sessions,
ctx->num_sessions,
ctx->num_sessions + 1);
@@ -191,61 +196,80 @@ handle_transfer_data (void *cls,
/**
+ * Free session data kept in @a ctx
+ *
+ * @param ctx context to clean up
+ */
+static void
+purge_context (struct HTD_Context *ctx)
+{
+ for (unsigned int i=0;i<ctx->num_sessions;i++)
+ TEH_plugin->free_link_data_list (TEH_plugin->cls,
+ ctx->sessions[i].ldl);
+ GNUNET_free_non_null (ctx->sessions);
+ ctx->sessions = NULL;
+ ctx->num_sessions = 0;
+}
+
+
+/**
* Execute a "/refresh/link". Returns the linkage information that
* will allow the owner of a coin to follow the refresh trail to
* the refreshed coin.
*
- * @param connection the MHD connection to handle
- * @param coin_pub public key of the coin to link
- * @return MHD result code
+ * If it returns a non-error code, the transaction logic MUST
+ * NOT queue a MHD response. IF it returns an hard error, the
+ * transaction logic MUST queue a MHD response and set @a mhd_ret. IF
+ * it returns the soft error code, the function MAY be called again to
+ * retry and MUST not queue a MHD response.
+ *
+ * @param cls closure
+ * @param connection MHD request which triggered the transaction
+ * @param session database session to use
+ * @param[out] mhd_ret set to MHD response status for @a connection,
+ * if transaction failed (!)
+ * @return transaction status
*/
-static int
-execute_refresh_link (struct MHD_Connection *connection,
- const struct TALER_CoinSpendPublicKeyP *coin_pub)
+static enum GNUNET_DB_QueryStatus
+refresh_link_transaction (void *cls,
+ struct MHD_Connection *connection,
+ struct TALER_EXCHANGEDB_Session *session,
+ int *mhd_ret)
{
- struct HTD_Context ctx;
- int res;
- unsigned int i;
+ struct HTD_Context *ctx = cls;
+ enum GNUNET_DB_QueryStatus qs;
- if (NULL == (ctx.session = TEH_plugin->get_session (TEH_plugin->cls)))
- {
- GNUNET_break (0);
- return TEH_RESPONSE_reply_internal_db_error (connection,
- TALER_EC_DB_SETUP_FAILED);
- }
- ctx.connection = connection;
- ctx.num_sessions = 0;
- ctx.sessions = NULL;
- ctx.status = GNUNET_OK;
- res = TEH_plugin->get_transfer (TEH_plugin->cls,
- ctx.session,
- coin_pub,
- &handle_transfer_data,
- &ctx);
- if (GNUNET_SYSERR == ctx.status)
+ ctx->session = session;
+ ctx->status = GNUNET_DB_STATUS_SUCCESS_ONE_RESULT;
+ qs = TEH_plugin->get_transfer (TEH_plugin->cls,
+ session,
+ &ctx->coin_pub,
+ &handle_transfer_data,
+ ctx);
+ ctx->session = NULL;
+ if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
{
- res = MHD_NO;
- goto cleanup;
+ *mhd_ret = TEH_RESPONSE_reply_arg_unknown (connection,
+ TALER_EC_REFRESH_LINK_COIN_UNKNOWN,
+ "coin_pub");
+ return GNUNET_DB_STATUS_HARD_ERROR;
}
- if (GNUNET_NO == ctx.status)
+ if (0 < qs)
{
- res = MHD_YES;
- goto cleanup;
+ qs = ctx->status;
+ if (GNUNET_DB_STATUS_SUCCESS_NO_RESULTS == qs)
+ {
+ *mhd_ret = TEH_RESPONSE_reply_json_pack (ctx->connection,
+ MHD_HTTP_NOT_FOUND,
+ "{s:s}",
+ "error",
+ "link data not found (link)");
+ return GNUNET_DB_STATUS_HARD_ERROR;
+ }
+ return qs;
}
- GNUNET_assert (GNUNET_OK == ctx.status);
- if (0 == ctx.num_sessions)
- return TEH_RESPONSE_reply_arg_unknown (connection,
- TALER_EC_REFRESH_LINK_COIN_UNKNOWN,
- "coin_pub");
- res = reply_refresh_link_success (connection,
- ctx.num_sessions,
- ctx.sessions);
- cleanup:
- for (i=0;i<ctx.num_sessions;i++)
- TEH_plugin->free_link_data_list (TEH_plugin->cls,
- ctx.sessions[i].ldl);
- GNUNET_free_non_null (ctx.sessions);
- return res;
+ purge_context (ctx);
+ return qs;
}
@@ -267,19 +291,35 @@ TEH_REFRESH_handler_refresh_link (struct TEH_RequestHandler *rh,
const char *upload_data,
size_t *upload_data_size)
{
- struct TALER_CoinSpendPublicKeyP coin_pub;
+ int mhd_ret;
int res;
+ struct HTD_Context ctx;
+ memset (&ctx,
+ 0,
+ sizeof (ctx));
res = TEH_PARSE_mhd_request_arg_data (connection,
"coin_pub",
- &coin_pub,
+ &ctx.coin_pub,
sizeof (struct TALER_CoinSpendPublicKeyP));
if (GNUNET_SYSERR == res)
return MHD_NO;
if (GNUNET_OK != res)
return MHD_YES;
- return execute_refresh_link (connection,
- &coin_pub);
+ if (GNUNET_OK !=
+ TEH_DB_run_transaction (connection,
+ &mhd_ret,
+ &refresh_link_transaction,
+ &ctx))
+ {
+ purge_context (&ctx);
+ return mhd_ret;
+ }
+ mhd_ret = reply_refresh_link_success (connection,
+ ctx.num_sessions,
+ ctx.sessions);
+ purge_context (&ctx);
+ return mhd_ret;
}
diff --git a/src/exchangedb/plugin_exchangedb_postgres.c b/src/exchangedb/plugin_exchangedb_postgres.c
index b029db58..b11eec16 100644
--- a/src/exchangedb/plugin_exchangedb_postgres.c
+++ b/src/exchangedb/plugin_exchangedb_postgres.c
@@ -3895,45 +3895,38 @@ postgres_insert_refresh_out (void *cls,
/**
- * Obtain the link data of a coin, that is the encrypted link
- * information, the denomination keys and the signatures.
- *
- * @param cls the `struct PostgresClosure` with the plugin-specific state
- * @param session database connection
- * @param session_hash refresh session to get linkage data for
- * @return all known link data for the session
+ * Closure for #add_ldl().
*/
-static struct TALER_EXCHANGEDB_LinkDataList *
-postgres_get_link_data_list (void *cls,
- struct TALER_EXCHANGEDB_Session *session,
- const struct GNUNET_HashCode *session_hash)
+struct LinkDataContext
{
+ /**
+ * List we are building.
+ */
struct TALER_EXCHANGEDB_LinkDataList *ldl;
- int nrows;
- struct GNUNET_PQ_QueryParam params[] = {
- GNUNET_PQ_query_param_auto_from_type (session_hash),
- GNUNET_PQ_query_param_end
- };
- PGresult *result;
- result = GNUNET_PQ_exec_prepared (session->conn,
- "get_link",
- params);
- ldl = NULL;
- if (PGRES_TUPLES_OK != PQresultStatus (result))
- {
- BREAK_DB_ERR (result, session->conn);
- PQclear (result);
- return NULL;
- }
- nrows = PQntuples (result);
- if (0 == nrows)
- {
- PQclear (result);
- return NULL;
- }
+ /**
+ * Status, set to #GNUNET_SYSERR on errors,
+ */
+ int status;
+};
+
- for (int i = nrows-1; i >= 0; i--)
+/**
+ * Function to be called with the results of a SELECT statement
+ * that has returned @a num_results results.
+ *
+ * @param cls closure of type `struct LinkDataContext *`
+ * @param result the postgres result
+ * @param num_result the number of results in @a result
+ */
+static void
+add_ldl (void *cls,
+ PGresult *result,
+ unsigned int num_results)
+{
+ struct LinkDataContext *ldc = cls;
+
+ for (int i = num_results - 1; i >= 0; i--)
{
struct GNUNET_CRYPTO_RsaPublicKey *denom_pub;
struct GNUNET_CRYPTO_RsaSignature *sig;
@@ -3954,71 +3947,98 @@ postgres_get_link_data_list (void *cls,
rs,
i))
{
- PQclear (result);
GNUNET_break (0);
common_free_link_data_list (cls,
- ldl);
+ ldc->ldl);
+ ldc->ldl = NULL;
GNUNET_free (pos);
- return NULL;
+ ldc->status = GNUNET_SYSERR;
+ return;
}
}
- pos->next = ldl;
+ pos->next = ldc->ldl;
pos->denom_pub.rsa_public_key = denom_pub;
pos->ev_sig.rsa_signature = sig;
- ldl = pos;
+ ldc->ldl = pos;
}
- PQclear (result);
- return ldl;
}
/**
- * Obtain shared secret and transfer public key from the public key of
- * the coin. This information and the link information returned by
- * #postgres_get_link_data_list() enable the owner of an old coin to
- * determine the private keys of the new coins after the melt.
+ * Obtain the link data of a coin, that is the encrypted link
+ * information, the denomination keys and the signatures.
*
* @param cls the `struct PostgresClosure` with the plugin-specific state
* @param session database connection
- * @param coin_pub public key of the coin
- * @param tdc function to call for each session the coin was melted into
- * @param tdc_cls closure for @a tdc
- * @return #GNUNET_OK on success,
- * #GNUNET_NO on failure (not found)
- * #GNUNET_SYSERR on internal failure (database issue)
+ * @param session_hash refresh session to get linkage data for
+ * @param[out] ldlp set to all known link data for the session
+ * @return transaction status code
*/
-static int
-postgres_get_transfer (void *cls,
- struct TALER_EXCHANGEDB_Session *session,
- const struct TALER_CoinSpendPublicKeyP *coin_pub,
- TALER_EXCHANGEDB_TransferDataCallback tdc,
- void *tdc_cls)
+static enum GNUNET_DB_QueryStatus
+postgres_get_link_data_list (void *cls,
+ struct TALER_EXCHANGEDB_Session *session,
+ const struct GNUNET_HashCode *session_hash,
+ struct TALER_EXCHANGEDB_LinkDataList **ldlp)
{
+ struct LinkDataContext ldc;
struct GNUNET_PQ_QueryParam params[] = {
- GNUNET_PQ_query_param_auto_from_type (coin_pub),
+ GNUNET_PQ_query_param_auto_from_type (session_hash),
GNUNET_PQ_query_param_end
};
- PGresult *result;
- int nrows;
+ enum GNUNET_DB_QueryStatus qs;
- result = GNUNET_PQ_exec_prepared (session->conn,
- "get_transfer",
- params);
- if (PGRES_TUPLES_OK !=
- PQresultStatus (result))
- {
- BREAK_DB_ERR (result, session->conn);
- PQclear (result);
- return GNUNET_SYSERR;
- }
- nrows = PQntuples (result);
- if (0 == nrows)
- {
- /* no matches found */
- PQclear (result);
- return GNUNET_NO;
- }
- for (int i=0;i<nrows;i++)
+ ldc.status = GNUNET_OK;
+ ldc.ldl = NULL;
+ qs = GNUNET_PQ_eval_prepared_multi_select (session->conn,
+ "get_link",
+ params,
+ &add_ldl,
+ &ldc);
+ *ldlp = ldc.ldl;
+ if (GNUNET_OK != ldc.status)
+ return GNUNET_DB_STATUS_HARD_ERROR;
+ return qs;
+}
+
+
+/**
+ * Closure for #add_link().
+ */
+struct AddLinkContext
+{
+ /**
+ * Function to call on each result.
+ */
+ TALER_EXCHANGEDB_TransferDataCallback tdc;
+
+ /**
+ * Closure for @e tdc.
+ */
+ void *tdc_cls;
+
+ /**
+ * Status code, set to #GNUNET_SYSERR on errors.
+ */
+ int status;
+};
+
+
+/**
+ * Function to be called with the results of a SELECT statement
+ * that has returned @a num_results results.
+ *
+ * @param cls closure of type `struct AddLinkContext *`
+ * @param result the postgres result
+ * @param num_result the number of results in @a result
+ */
+static void
+add_link (void *cls,
+ PGresult *result,
+ unsigned int num_results)
+{
+ struct AddLinkContext *alc = cls;
+
+ for (unsigned int i=0;i<num_results;i++)
{
struct GNUNET_HashCode session_hash;
struct TALER_TransferPublicKeyP transfer_pub;
@@ -4033,16 +4053,55 @@ postgres_get_transfer (void *cls,
rs,
i))
{
- PQclear (result);
GNUNET_break (0);
- return GNUNET_SYSERR;
+ alc->status = GNUNET_SYSERR;
+ return;
}
- tdc (tdc_cls,
- &session_hash,
- &transfer_pub);
+ alc->tdc (alc->tdc_cls,
+ &session_hash,
+ &transfer_pub);
}
- PQclear (result);
- return GNUNET_OK;
+}
+
+
+/**
+ * Obtain shared secret and transfer public key from the public key of
+ * the coin. This information and the link information returned by
+ * #postgres_get_link_data_list() enable the owner of an old coin to
+ * determine the private keys of the new coins after the melt.
+ *
+ * @param cls the `struct PostgresClosure` with the plugin-specific state
+ * @param session database connection
+ * @param coin_pub public key of the coin
+ * @param tdc function to call for each session the coin was melted into
+ * @param tdc_cls closure for @a tdc
+ * @return statement execution status
+ */
+static enum GNUNET_DB_QueryStatus
+postgres_get_transfer (void *cls,
+ struct TALER_EXCHANGEDB_Session *session,
+ const struct TALER_CoinSpendPublicKeyP *coin_pub,
+ TALER_EXCHANGEDB_TransferDataCallback tdc,
+ void *tdc_cls)
+{
+ struct GNUNET_PQ_QueryParam params[] = {
+ GNUNET_PQ_query_param_auto_from_type (coin_pub),
+ GNUNET_PQ_query_param_end
+ };
+ struct AddLinkContext al_ctx;
+ enum GNUNET_DB_QueryStatus qs;
+
+ al_ctx.tdc = tdc;
+ al_ctx.tdc_cls = tdc_cls;
+ al_ctx.status = GNUNET_OK;
+ qs = GNUNET_PQ_eval_prepared_multi_select (session->conn,
+ "get_transfer",
+ params,
+ &add_link,
+ &al_ctx);
+ if (GNUNET_OK != al_ctx.status)
+ qs = GNUNET_DB_STATUS_HARD_ERROR;
+ return qs;
}
diff --git a/src/exchangedb/test_exchangedb.c b/src/exchangedb/test_exchangedb.c
index 9a58a38e..df730a07 100644
--- a/src/exchangedb/test_exchangedb.c
+++ b/src/exchangedb/test_exchangedb.c
@@ -530,6 +530,7 @@ test_melting (struct TALER_EXCHANGEDB_Session *session)
struct TALER_DenominationSignature ev_sigs[MELT_NEW_COINS];
unsigned int cnt;
int ret;
+ enum GNUNET_DB_QueryStatus qs;
ret = GNUNET_SYSERR;
memset (ev_sigs, 0, sizeof (ev_sigs));
@@ -695,9 +696,11 @@ test_melting (struct TALER_EXCHANGEDB_Session *session)
GNUNET_CRYPTO_rsa_signature_free (test_sig.rsa_signature);
}
- ldl = plugin->get_link_data_list (plugin->cls,
- session,
- &session_hash);
+ qs = plugin->get_link_data_list (plugin->cls,
+ session,
+ &session_hash,
+ &ldl);
+ FAILIF (0 >= qs);
FAILIF (NULL == ldl);
for (ldlp = ldl; NULL != ldlp; ldlp = ldlp->next)
{
@@ -742,7 +745,7 @@ test_melting (struct TALER_EXCHANGEDB_Session *session)
int ok;
ok = GNUNET_NO;
- FAILIF (GNUNET_OK !=
+ FAILIF (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT !=
plugin->get_transfer (plugin->cls,
session,
&meltp->coin.coin_pub,
diff --git a/src/include/taler_exchangedb_plugin.h b/src/include/taler_exchangedb_plugin.h
index 23e80c07..0406c8d1 100644
--- a/src/include/taler_exchangedb_plugin.h
+++ b/src/include/taler_exchangedb_plugin.h
@@ -1652,12 +1652,14 @@ struct TALER_EXCHANGEDB_Plugin
* @param cls the @e cls of this struct with the plugin-specific state
* @param session database connection
* @param session_hash session to get linkage data for
- * @return all known link data for the session
+ * @param[out] ldldp set to all known link data for the session
+ * @return status of the transaction
*/
- struct TALER_EXCHANGEDB_LinkDataList *
+ enum GNUNET_DB_QueryStatus
(*get_link_data_list) (void *cls,
struct TALER_EXCHANGEDB_Session *session,
- const struct GNUNET_HashCode *session_hash);
+ const struct GNUNET_HashCode *session_hash,
+ struct TALER_EXCHANGEDB_LinkDataList **ldlp);
/**
@@ -1682,11 +1684,9 @@ struct TALER_EXCHANGEDB_Plugin
* @param coin_pub public key of the coin
* @param tdc function to call for each session the coin was melted into
* @param tdc_cls closure for @a tdc
- * @return #GNUNET_OK on success,
- * #GNUNET_NO on failure (not found)
- * #GNUNET_SYSERR on internal failure (database issue)
+ * @return statement execution status
*/
- int
+ enum GNUNET_DB_QueryStatus
(*get_transfer) (void *cls,
struct TALER_EXCHANGEDB_Session *session,
const struct TALER_CoinSpendPublicKeyP *coin_pub,