Put KYC-related low-level DB methods.

src/exchangedb/plugin_exchangedb_postgres.c

@@ -105,6 +105,7 @@ postgres_drop_tables (void *cls)
 {
   struct PostgresClosure *pc = cls;
   struct GNUNET_PQ_ExecuteStatement es[] = {
+    GNUNET_PQ_make_execute ("DROP TABLE IF EXISTS kyc_events CASCADE;"),
     GNUNET_PQ_make_execute ("DROP TABLE IF EXISTS prewire CASCADE;"),
     GNUNET_PQ_make_execute ("DROP TABLE IF EXISTS payback CASCADE;"),
     GNUNET_PQ_make_execute ("DROP TABLE IF EXISTS aggregation_tracking CASCADE;"),
@@ -428,6 +429,15 @@ postgres_create_tables (void *cls)
                            ",finished BOOLEAN NOT NULL DEFAULT false"
                            ",buf BYTEA NOT NULL"
                            ");"),
+
+    GNUNET_PQ_make_execute("CREATE TABLE IF NOT EXISTS kyc_events "
+                           "(url TEXT NOT NULL"
+                           ",timestamp INT8 NOT NULL"
+                           ",amount_val INT8 NOT NULL"
+                           ",amount_frac INT4 NOT NULL"
+                           ",amount_curr VARCHAR("TALER_CURRENCY_LEN_STR") NOT NULL"
+                           ");"),
+
     /* Index for wire_prepare_data_get and gc_prewire statement */
     GNUNET_PQ_make_try_execute("CREATE INDEX prepare_iteration_index "
                                "ON prewire(finished);"),
@@ -1265,6 +1275,33 @@ postgres_prepare (PGconn *db_conn)
                             " ORDER BY prewire_uuid ASC"
                             " LIMIT 1;",
                             0),
+    /* Used in #postgres_insert_kyc_event */
+    GNUNET_PQ_make_prepare ("kyc_event_insert",
+                            "INSERT INTO kyc_events "
+                            "(url"
+                            ",timestamp"
+                            ",amount_val"
+                            ",amount_frac"
+                            ",amount_curr"
+                            ") VALUES "
+                            "($1, $2, $3, $4);",
+                            4),
+
+    /* Used in #postgres_kyc_event_get_last */
+    GNUNET_PQ_make_prepare ("kyc_event_get_last",
+                            "SELECT "
+                            " url"
+                            ",timestamp"
+                            ",amount_val"
+                            ",amount_frac"
+                            ",amount_curr"
+                            " FROM kyc_events"
+                            " WHERE url=$1"
+                            " ORDER BY timestamp"
+                            " LIMIT 1"
+                            " OFFSET 0;",
+                            1),
+
     /* Used in #postgres_select_deposits_missing_wire */
     GNUNET_PQ_make_prepare ("deposits_get_overdue",
 			    "SELECT"
@@ -6474,12 +6511,88 @@ postgres_select_deposits_missing_wire (void *cls,
   return qs;
 }
 
+/**
+ * Save a amount threshold for a KYC check that
+ * has been triggered for a certain merchant.
+ *
+ * @param cls plugins' closure
+ * @param url "payto" url identifying the merchant to be checked.
+ * @param amount the threshold amount associated with the check.
+ * @return transaction status code.
+ */
+static enum GNUNET_DB_QueryStatus
+postgres_insert_kyc_event (void *cls,
+                           struct TALER_EXCHANGEDB_Session *session,
+                           const char *url,
+                           const struct TALER_Amount *amount)
+{
+
+  enum GNUNET_DB_QueryStatus qs;
+
+  struct GNUNET_PQ_QueryParam params[] = {
+    GNUNET_PQ_query_param_string (url),
+    TALER_PQ_query_param_amount (amount),
+    GNUNET_PQ_query_param_end
+  };
+
+  qs = GNUNET_PQ_eval_prepared_non_select (session->conn,
+                                           "kyc_event_insert",
+					   params);
+  return qs;
+}
+
+/**
+ * Get the _last_ KYC event associated with a certain merchant.
+ *
+ * @param cls plugin closure
+ * @param url the payto URL associated with the merchant whose
+ *        KYC has to be returned.
+ * @param kyc_cb callback invoked with the timeout of last KYC event
+ * @param kyc_cb_cls closure for callback above
+ * @return transaction status
+ */
+static enum GNUNET_DB_QueryStatus
+postgres_kyc_event_get_last (void *cls,
+                             struct TALER_EXCHANGEDB_Session *session,
+                             const char *url,
+                             TALER_EXCHANGEDB_KycCallback kyc_cb,
+                             void *kyc_cb_cls)
+{
+  enum GNUNET_DB_QueryStatus qs;
+  struct GNUNET_TIME_Absolute ts;
+
+  struct GNUNET_PQ_QueryParam params[] = {
+    GNUNET_PQ_query_param_string (url),
+    GNUNET_PQ_query_param_end
+  };
+
+  struct GNUNET_PQ_ResultSpec rs[] = {
+    TALER_PQ_result_spec_absolute_time
+      ("timestamp", &ts),
+    GNUNET_PQ_result_spec_end
+  };
+
+  qs = GNUNET_PQ_eval_prepared_singleton_select
+    (session->conn,
+     "kyc_event_get_last",
+     params,
+     rs);
+
+  kyc_cb (kyc_cb_cls,
+          ts);
+
+  if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qs)
+    GNUNET_PQ_cleanup_result (rs); 
+
+  return qs;
+}
 
 /**
  * Initialize Postgres database subsystem.
  *
  * @param cls a configuration instance
- * @return NULL on error, otherwise a `struct TALER_EXCHANGEDB_Plugin`
+ * @return NULL on error, otherwise a `struct
+ *         TALER_EXCHANGEDB_Plugin`
  */
 void *
 libtaler_plugin_exchangedb_postgres_init (void *cls)
@@ -6607,6 +6720,10 @@ libtaler_plugin_exchangedb_postgres_init (void *cls)
     = &postgres_get_denomination_revocation;
   plugin->select_deposits_missing_wire
     = &postgres_select_deposits_missing_wire;
+
+  plugin->insert_kyc_event = postgres_insert_kyc_event;
+  plugin->kyc_event_get_last = postgres_kyc_event_get_last;
+
   return plugin;
 }
 

src/include/taler_exchangedb_plugin.h

@@ -807,6 +807,10 @@ typedef void
                                     const struct TALER_TransferPublicKeyP *tp);
 
 
+typedef void
+(*TALER_EXCHANGEDB_KycCallback)(void *cls,
+                                struct GNUNET_TIME_Absolute timeout);
+
 /**
  * Function called with details about coins that were refunding,
  * with the goal of auditing the refund's execution.
@@ -2208,8 +2212,35 @@ struct TALER_EXCHANGEDB_Plugin
 				  TALER_EXCHANGEDB_WireMissingCallback cb,
 				  void *cb_cls);
 
+  /**
+   * Save a amount threshold for a KYC check that
+   * has been triggered for a certain merchant.
+   *
+   * @param cls plugins' closure
+   * @param url "payto" url identifying the merchant to be checked.
+   * @param amount the threshold amount associated with the check.
+   * @return transaction status code.
+   */
+  enum GNUNET_DB_QueryStatus
+  (*insert_kyc_event)(void *cls,
+                      struct TALER_EXCHANGEDB_Session *session,
+                      const char *url,
+                      const struct TALER_Amount *amount);
 
+  /**
+   * Get the _last_ KYC event associated with a certain merchant.
+   *
+   * @param cls plugin closure
+   * @param url the payto URL associated with the merchant whose
+   *        KYC has to be returned.
+   * @return transaction status.
+   */
+  enum GNUNET_DB_QueryStatus
+  (*kyc_event_get_last) (void *cls,
+                         struct TALER_EXCHANGEDB_Session *session,
+                         const char *url,
+                         TALER_EXCHANGEDB_KycCallback kyc_cb,
+                         void *kyc_cb_cls);
 };
 
-
 #endif /* _TALER_EXCHANGE_DB_H */