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authorChristian Grothoff <christian@grothoff.org>2020-12-09 12:31:10 +0100
committerChristian Grothoff <christian@grothoff.org>2020-12-09 12:31:10 +0100
commitfa1914b26781a9409a35fd6f8bfb54aae09fdd79 (patch)
tree626be333f8fb26f7a0d58fe334fc7cd41952af08 /src
parent9911b327ac299ec7eeae81b98cb520f4153071f2 (diff)
downloadexchange-fa1914b26781a9409a35fd6f8bfb54aae09fdd79.tar.gz
exchange-fa1914b26781a9409a35fd6f8bfb54aae09fdd79.tar.bz2
exchange-fa1914b26781a9409a35fd6f8bfb54aae09fdd79.zip
work on new logic to generate /wire response
Diffstat (limited to 'src')
-rw-r--r--src/exchange/taler-exchange-httpd_wire2.c315
-rw-r--r--src/exchangedb/plugin_exchangedb_postgres.c259
-rw-r--r--src/include/taler_exchangedb_plugin.h67
3 files changed, 641 insertions, 0 deletions
diff --git a/src/exchange/taler-exchange-httpd_wire2.c b/src/exchange/taler-exchange-httpd_wire2.c
new file mode 100644
index 00000000..b2f8a2a1
--- /dev/null
+++ b/src/exchange/taler-exchange-httpd_wire2.c
@@ -0,0 +1,315 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2015-2020 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
+ Foundation; either version 3, or (at your option) any later version.
+
+ TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License along with
+ TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file taler-exchange-httpd_wire.c
+ * @brief Handle /wire requests
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <gnunet/gnunet_json_lib.h>
+#include "taler-exchange-httpd_keystate.h"
+#include "taler-exchange-httpd_responses.h"
+#include "taler-exchange-httpd_wire.h"
+#include "taler_json_lib.h"
+#include "taler_mhd_lib.h"
+#include <jansson.h>
+
+
+/**
+ * Thread-local. Contains a pointer to `struct WireStateHandle` or NULL.
+ * Stores the per-thread latest generation of our wire response.
+ */
+static pthread_key_t wire_state;
+
+/**
+ * Counter incremented whenever we have a reason to re-build the #wire_state
+ * because something external changed (in another thread). The counter is
+ * manipulated using an atomic update, and thus to ensure that threads notice
+ * when it changes, the variable MUST be volatile. See #get_wire_state()
+ * and #TEH_wire_update_state() for uses of this variable.
+ */
+static volatile uint64_t wire_generation;
+
+
+/**
+ * State we keep per thread to cache the /wire response.
+ */
+struct WireStateHandle
+{
+ /**
+ * Cached JSON for /wire response.
+ */
+ json_t *wire_reply;
+
+ /**
+ * For which (global) wire_generation was this data structure created?
+ * Used to check when we are outdated and need to be re-generated.
+ */
+ uint64_t wire_generation;
+
+};
+
+
+/**
+ * Free memory assciated with @a wsh
+ *
+ * @param[in] wsh wire state to destroy
+ */
+static void
+destroy_wire_state (struct WireStateHandle *wsh)
+{
+ json_decref (wsh->wire_reply);
+ GNUNET_free (wsh);
+}
+
+
+/**
+ * Add information about a wire account to @a cls.
+ *
+ * @param cls a `json_t *` object to expand with wire account details
+ * @param payto_uri the exchange bank account URI to add
+ * @param master_sig master key signature affirming that this is a bank
+ * account of the exchange (of purpose #TALER_SIGNATURE_MASTER_WIRE_DETAILS)
+ */
+static void
+add_wire_account (void *cls,
+ const char *payto_uri,
+ const struct TALER_MasterSignatureP *master_sig)
+{
+ json_t *a = cls;
+
+ if (0 !=
+ json_array_append_new (
+ a,
+ json_pack ("{s:s, s:o}",
+ "url", /* "payto_uri" would be better, but this is the name in the spec */
+ payto_uri,
+ "sig",
+ GNUNET_JSON_from_data_auto (master_sig))))
+ {
+ GNUNET_break (0); /* out of memory!? */
+ return;
+ }
+}
+
+
+/**
+ * Add information about a wire account to @a cls.
+ *
+ * @param cls a `json_t *` array to expand with wire account details
+ * @param wire_fee the wire fee we charge
+ * @param closing_fee the closing fee we charge
+ * @param start_date from when are these fees valid (start date)
+ * @param end_date until when are these fees valid (end date, exclusive)
+ * @param master_sig master key signature affirming that this is the corrrect
+ * fee (of purpose #TALER_SIGNATURE_MASTER_WIRE_FEES)
+ */
+static void
+add_wire_fee (void *cls,
+ const struct TALER_Amount *wire_fee,
+ const struct TALER_Amount *closing_fee,
+ struct GNUNET_TIME_Absolute start_date,
+ struct GNUNET_TIME_Absolute end_date,
+ const struct TALER_MasterSignatureP *master_sig)
+{
+ json_t *a = cls;
+
+ if (0 !=
+ json_array_append_new (
+ a,
+ json_pack ("{s:o, s:o, s:o, s:o, s:o}",
+ "wire_fee",
+ TALER_JSON_from_amount (wire_fee),
+ "closing_fee",
+ TALER_JSON_from_amount (closing_fee),
+ "start_date",
+ GNUNET_JSON_from_time_abs (start_date),
+ "end_date",
+ GNUNET_JSON_from_time_abs (end_date),
+ "sig",
+ GNUNET_JSON_from_data_auto (master_sig))))
+ {
+ GNUNET_break (0); /* out of memory!? */
+ return;
+ }
+}
+
+
+/**
+ * Create the /wire response from our database state.
+ *
+ * @return NULL on error
+ */
+static struct WireStateHandle *
+build_wire_state (void)
+{
+ json_t *wire_accounts_array;
+ json_t *wire_fee_object;
+ json_t *wire_reply;
+ uint64_t wg = wire_generation; /* must be obtained FIRST */
+ enum GNUNET_DB_QueryStatus qs;
+
+ wire_accounts_array = json_array ();
+ GNUNET_assert (NULL != wire_accounts_array);
+ qs = TEH_plugin->get_wire_accounts (TEH_plugin->cls,
+ &add_wire_account,
+ wire_accounts_array);
+ if (0 > qs)
+ {
+ GNUNET_break (0);
+ json_decref (wire_accounts_array);
+ return NULL;
+ }
+ wire_fee_object = json_object ();
+ GNUNET_assert (NULL != wire_fee_object);
+ {
+ json_t *account;
+ size_t index;
+
+ json_array_foreach (wire_accounts_array, index, account) {
+ char *wire_method;
+ const char *payto_uri = json_string_value (json_object_get (account,
+ "url"));
+ GNUNET_assert (NULL != payto_uri);
+ wire_method = TALER_payto_get_method (payto_uri);
+ if (NULL == json_object_get (wire_fee_object,
+ wire_method))
+ {
+ json_t *a = json_array ();
+
+ GNUNET_assert (NULL != a);
+ qs = TEH_plugin->get_wire_fees (TEH_plugin->cls,
+ wire_method,
+ &add_wire_fee,
+ a);
+ if (0 > qs)
+ {
+ GNUNET_break (0);
+ json_decref (a);
+ json_decref (wire_fee_object);
+ json_decref (wire_accounts_array);
+ return NULL;
+ }
+ GNUNET_assert (0 ==
+ json_object_set_new (wire_fee_object,
+ wire_method,
+ a));
+ }
+ GNUNET_free (wire_method);
+
+ }
+ }
+ wire_reply = json_pack (
+ "{s:O, s:O, s:o}",
+ "accounts", wire_accounts_array,
+ "fees", wire_fee_object,
+ "master_public_key",
+ GNUNET_JSON_from_data_auto (&TEH_master_public_key));
+ GNUNET_assert (NULL != wire_reply);
+ {
+ struct WireStateHandle *wsh;
+
+ wsh = GNUNET_new (struct WireStateHandle);
+ wsh->wire_reply = wire_reply;
+ wsh->wire_generation = wg;
+ return wsh;
+ }
+}
+
+
+/**
+ * Something changed in the database. Rebuild the wire replies. This function
+ * should be called if the exchange learns about a new signature from our
+ * master key.
+ *
+ * (We do not do so immediately, but merely signal to all threads that they
+ * need to rebuild their wire state upon the next call to
+ * #wire_get_state()).
+ */
+void
+TEH_wire_update_state ()
+{
+ __sync_fetch_and_add (&key_generation,
+ 1);
+}
+
+
+/**
+ * Return the current key state for this thread. Possibly
+ * re-builds the key state if we have reason to believe
+ * that something changed.
+ *
+ * @return NULL on error
+ */
+struct WireStateHandle *
+get_wire_state (void)
+{
+ struct WireStateHandle *old_wsh;
+ struct WireStateHandle *wsh;
+
+ old_wsh = pthread_getspecific (wire_state);
+ if ( (NULL == old_wsh) ||
+ (old_wsh->key_generation < key_generation) )
+ {
+ wsh = build_wire_state ();
+ if (NULL == wsh)
+ return NULL;
+ if (0 != pthread_setspecific (wire_state,
+ wsh))
+ {
+ GNUNET_break (0);
+ destroy_wire_state (wsh);
+ return NULL;
+ }
+ if (NULL != old_wsh)
+ destroy_key_state (old_wsh,
+ false);
+ return wsh;
+ }
+ return old_wsh;
+}
+
+
+/**
+ * Handle a "/wire" request.
+ *
+ * @param rh context of the handler
+ * @param connection the MHD connection to handle
+ * @param args array of additional options (must be empty for this function)
+ * @return MHD result code
+ */
+MHD_RESULT
+TEH_handler_wire (const struct TEH_RequestHandler *rh,
+ struct MHD_Connection *connection,
+ const char *const args[])
+{
+ struct WireStateHandle *wsh;
+
+ (void) rh;
+ (void) args;
+ wsh = get_wire_state ();
+ if (NULL == wsh)
+ TALER_MHD_reply_error (connection,
+ MHD_HTTP_INTERNAL_SERVER_ERROR,
+ TALER_EC_WTF,
+ NULL);
+ return TALER_MHD_reply_json (connection,
+ json_incref (wsh->wire_reply),
+ MHD_HTTP_OK);
+}
+
+
+/* end of taler-exchange-httpd_wire.c */
diff --git a/src/exchangedb/plugin_exchangedb_postgres.c b/src/exchangedb/plugin_exchangedb_postgres.c
index 2fcb0d01..24ae5b2e 100644
--- a/src/exchangedb/plugin_exchangedb_postgres.c
+++ b/src/exchangedb/plugin_exchangedb_postgres.c
@@ -1519,6 +1519,27 @@ postgres_get_session (void *cls)
" ,last_change=$3"
" WHERE payto_uri=$1",
3),
+ /* used in #postgres_update_wire() */
+ GNUNET_PQ_make_prepare ("get_wire_accounts",
+ "SELECT"
+ " payto_uri"
+ ",master_sig"
+ " FROM wire_accounts"
+ " WHERE is_active",
+ 0),
+ /* used in #postgres_update_wire() */
+ GNUNET_PQ_make_prepare ("get_wire_fees",
+ "SELECT"
+ " wire_fee_val"
+ ",wire_fee_frac"
+ ",closing_fee_val"
+ ",closing_fee_frac"
+ ",start_date"
+ ",end_date"
+ ",master_sig"
+ " FROM wire_fee"
+ " WHERE wire_method=$1",
+ 1),
/* used in #postgres_insert_signkey_revocation() */
GNUNET_PQ_make_prepare ("insert_signkey_revocation",
"INSERT INTO signkey_revocations "
@@ -8212,6 +8233,240 @@ postgres_update_wire (void *cls,
/**
+ * Closure for #get_wire_accounts_cb().
+ */
+struct GetWireAccountsContext
+{
+ /**
+ * Function to call per result.
+ */
+ TALER_EXCHANGEDB_WireAccountCallback cb;
+
+ /**
+ * Closure for @e cb.
+ */
+ void *cb_cls;
+
+ /**
+ * Flag set to #GNUNET_OK as long as everything is fine.
+ */
+ int status;
+
+};
+
+
+/**
+ * Invoke the callback for each result.
+ *
+ * @param cls a `struct MissingWireContext *`
+ * @param result SQL result
+ * @param num_results number of rows in @a result
+ */
+static void
+get_wire_accounts_cb (void *cls,
+ PGresult *result,
+ unsigned int num_results)
+{
+ struct GetWireAccountsContext *ctx = cls;
+
+ for (unsigned int i = 0; i < num_results; i++)
+ {
+ char *payto_uri;
+ struct TALER_MasterSignatureP master_sig;
+ struct GNUNET_PQ_ResultSpec rs[] = {
+ GNUNET_PQ_result_spec_string ("payto_uri",
+ &payto_uri),
+ GNUNET_PQ_result_spec_auto_from_type ("master_sig",
+ &master_sig),
+ GNUNET_PQ_result_spec_end
+ };
+
+ if (GNUNET_OK !=
+ GNUNET_PQ_extract_result (result,
+ rs,
+ i))
+ {
+ GNUNET_break (0);
+ ctx->status = GNUNET_SYSERR;
+ return;
+ }
+ ctx->cb (ctx->cb_cls,
+ payto_uri,
+ &master_sig);
+ GNUNET_PQ_cleanup_result (rs);
+ }
+}
+
+
+/**
+ * Obtain information about the enabled wire accounts of the exchange.
+ *
+ * @param cls closure
+ * @param cb function to call on each account
+ * @param cb_cls closure for @a cb
+ * @return transaction status code
+ */
+static enum GNUNET_DB_QueryStatus
+postgres_get_wire_accounts (void *cls,
+ TALER_EXCHANGEDB_WireAccountCallback cb,
+ void *cb_cls)
+{
+ struct PostgresClosure *pg = cls;
+ struct GetWireAccountsContext ctx = {
+ .cb = cb,
+ .cb_cls = cb_cls,
+ .status = GNUNET_OK
+ };
+ struct GNUNET_PQ_QueryParam params[] = {
+ GNUNET_PQ_query_param_end
+ };
+ enum GNUNET_DB_QueryStatus qs;
+ struct TALER_EXCHANGEDB_Session *session;
+
+ session = postgres_get_session (pg);
+ if (NULL == session)
+ return GNUNET_DB_STATUS_HARD_ERROR;
+ qs = GNUNET_PQ_eval_prepared_multi_select (session->conn,
+ "get_wire_accounts",
+ params,
+ &get_wire_accounts_cb,
+ &ctx);
+ if (GNUNET_OK != ctx.status)
+ return GNUNET_DB_STATUS_HARD_ERROR;
+ return qs;
+
+}
+
+
+/**
+ * Closure for #get_wire_fees_cb().
+ */
+struct GetWireFeesContext
+{
+ /**
+ * Function to call per result.
+ */
+ TALER_EXCHANGEDB_WireFeeCallback cb;
+
+ /**
+ * Closure for @e cb.
+ */
+ void *cb_cls;
+
+ /**
+ * Plugin context.
+ */
+ struct PostgresClosure *pg;
+
+ /**
+ * Flag set to #GNUNET_OK as long as everything is fine.
+ */
+ int status;
+
+};
+
+
+/**
+ * Invoke the callback for each result.
+ *
+ * @param cls a `struct MissingWireContext *`
+ * @param result SQL result
+ * @param num_results number of rows in @a result
+ */
+static void
+get_wire_fees_cb (void *cls,
+ PGresult *result,
+ unsigned int num_results)
+{
+ struct GetWireFeesContext *ctx = cls;
+ struct PostgresClosure *pg = ctx->pg;
+
+ for (unsigned int i = 0; i < num_results; i++)
+ {
+ struct TALER_MasterSignatureP master_sig;
+ struct TALER_Amount wire_fee;
+ struct TALER_Amount closing_fee;
+ struct GNUNET_TIME_Absolute start_date;
+ struct GNUNET_TIME_Absolute end_date;
+ struct GNUNET_PQ_ResultSpec rs[] = {
+ TALER_PQ_RESULT_SPEC_AMOUNT ("wire_fee",
+ &wire_fee),
+ TALER_PQ_RESULT_SPEC_AMOUNT ("closing_fee",
+ &closing_fee),
+ TALER_PQ_result_spec_absolute_time ("start_date",
+ &start_date),
+ TALER_PQ_result_spec_absolute_time ("end_date",
+ &end_date),
+ GNUNET_PQ_result_spec_auto_from_type ("master_sig",
+ &master_sig),
+ GNUNET_PQ_result_spec_end
+ };
+
+ if (GNUNET_OK !=
+ GNUNET_PQ_extract_result (result,
+ rs,
+ i))
+ {
+ GNUNET_break (0);
+ ctx->status = GNUNET_SYSERR;
+ return;
+ }
+ ctx->cb (ctx->cb_cls,
+ &wire_fee,
+ &closing_fee,
+ start_date,
+ end_date,
+ &master_sig);
+ GNUNET_PQ_cleanup_result (rs);
+ }
+}
+
+
+/**
+ * Obtain information about the fee structure of the exchange for
+ * a given @a wire_method
+ *
+ * @param cls closure
+ * @param wire_method which wire method to obtain fees for
+ * @param cb function to call on each account
+ * @param cb_cls closure for @a cb
+ * @return transaction status code
+ */
+static enum GNUNET_DB_QueryStatus
+postgres_get_wire_fees (void *cls,
+ const char *wire_method,
+ TALER_EXCHANGEDB_WireFeeCallback cb,
+ void *cb_cls)
+{
+ struct PostgresClosure *pg = cls;
+ struct GNUNET_PQ_QueryParam params[] = {
+ GNUNET_PQ_query_param_string (wire_method),
+ GNUNET_PQ_query_param_end
+ };
+ struct GetWireFeesContext ctx = {
+ .cb = cb,
+ .cb_cls = cb_cls,
+ .pg = pg,
+ .status = GNUNET_OK
+ };
+ enum GNUNET_DB_QueryStatus qs;
+ struct TALER_EXCHANGEDB_Session *session;
+
+ session = postgres_get_session (pg);
+ if (NULL == session)
+ return GNUNET_DB_STATUS_HARD_ERROR;
+ qs = GNUNET_PQ_eval_prepared_multi_select (session->conn,
+ "get_wire_fees",
+ params,
+ &get_wire_fees_cb,
+ &ctx);
+ if (GNUNET_OK != ctx.status)
+ return GNUNET_DB_STATUS_HARD_ERROR;
+ return qs;
+}
+
+
+/**
* Store information about a revoked online signing key.
*
* @param cls closure
@@ -8810,6 +9065,10 @@ libtaler_plugin_exchangedb_postgres_init (void *cls)
= &postgres_insert_wire;
plugin->update_wire
= &postgres_update_wire;
+ plugin->get_wire_accounts
+ = &postgres_get_wire_accounts;
+ plugin->get_wire_fees
+ = &postgres_get_wire_fees;
plugin->insert_signkey_revocation
= &postgres_insert_signkey_revocation;
plugin->lookup_future_denomination_key
diff --git a/src/include/taler_exchangedb_plugin.h b/src/include/taler_exchangedb_plugin.h
index 57254787..65c31726 100644
--- a/src/include/taler_exchangedb_plugin.h
+++ b/src/include/taler_exchangedb_plugin.h
@@ -1428,6 +1428,42 @@ typedef int
/**
+ * Provide information about a wire account.
+ *
+ * @param cls closure
+ * @param payto_uri the exchange bank account URI
+ * @param master_sig master key signature affirming that this is a bank
+ * account of the exchange (of purpose #TALER_SIGNATURE_MASTER_WIRE_DETAILS)
+ */
+typedef void
+(*TALER_EXCHANGEDB_WireAccountCallback)(
+ void *cls,
+ const char *payto_uri,
+ const struct TALER_MasterSignatureP *master_sig);
+
+
+/**
+ * Provide information about wire fees.
+ *
+ * @param cls closure
+ * @param wire_fee the wire fee we charge
+ * @param closing_fee the closing fee we charge
+ * @param start_date from when are these fees valid (start date)
+ * @param end_date until when are these fees valid (end date, exclusive)
+ * @param master_sig master key signature affirming that this is the corrrect
+ * fee (of purpose #TALER_SIGNATURE_MASTER_WIRE_FEES)
+ */
+typedef void
+(*TALER_EXCHANGEDB_WireFeeCallback)(
+ void *cls,
+ const struct TALER_Amount *wire_fee,
+ const struct TALER_Amount *closing_fee,
+ struct GNUNET_TIME_Absolute start_date,
+ struct GNUNET_TIME_Absolute end_date,
+ const struct TALER_MasterSignatureP *master_sig);
+
+
+/**
* Function called with details about withdraw operations.
*
* @param cls closure
@@ -3255,6 +3291,37 @@ struct TALER_EXCHANGEDB_Plugin
/**
+ * Obtain information about the enabled wire accounts of the exchange.
+ *
+ * @param cls closure
+ * @param cb function to call on each account
+ * @param cb_cls closure for @a cb
+ * @return transaction status code
+ */
+ enum GNUNET_DB_QueryStatus
+ (*get_wire_accounts)(void *cls,
+ TALER_EXCHANGEDB_WireAccountCallback cb,
+ void *cb_cls);
+
+
+ /**
+ * Obtain information about the fee structure of the exchange for
+ * a given @a wire_method
+ *
+ * @param cls closure
+ * @param wire_method which wire method to obtain fees for
+ * @param cb function to call on each account
+ * @param cb_cls closure for @a cb
+ * @return transaction status code
+ */
+ enum GNUNET_DB_QueryStatus
+ (*get_wire_fees)(void *cls,
+ const char *wire_method,
+ TALER_EXCHANGEDB_WireFeeCallback cb,
+ void *cb_cls);
+
+
+ /**
* Store information about a revoked online signing key.
*
* @param cls closure