1 files changed, 136 insertions, 0 deletions
diff --git a/src/exchange/taler-exchange-httpd_metrics.h b/src/exchange/taler-exchange-httpd_metrics.h
new file mode 100644
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+++ b/src/exchange/taler-exchange-httpd_metrics.h
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+/*
+  This file is part of TALER
+  Copyright (C) 2014--2021 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_metrics.h
+ * @brief Handle /metrics requests
+ * @author Christian Grothoff
+ */
+#ifndef TALER_EXCHANGE_HTTPD_METRICS_H
+#define TALER_EXCHANGE_HTTPD_METRICS_H
+
+#include <gnunet/gnunet_util_lib.h>
+#include <microhttpd.h>
+#include "taler-exchange-httpd.h"
+
+
+/**
+ * Request types for which we collect metrics.
+ */
+enum TEH_MetricTypeRequest
+{
+  TEH_MT_REQUEST_OTHER = 0,
+  TEH_MT_REQUEST_DEPOSIT = 1,
+  TEH_MT_REQUEST_WITHDRAW = 2,
+  TEH_MT_REQUEST_AGE_WITHDRAW = 3,
+  TEH_MT_REQUEST_MELT = 4,
+  TEH_MT_REQUEST_PURSE_CREATE = 5,
+  TEH_MT_REQUEST_PURSE_MERGE = 6,
+  TEH_MT_REQUEST_RESERVE_PURSE = 7,
+  TEH_MT_REQUEST_PURSE_DEPOSIT = 8,
+  TEH_MT_REQUEST_IDEMPOTENT_DEPOSIT = 9,
+  TEH_MT_REQUEST_IDEMPOTENT_WITHDRAW = 10,
+  TEH_MT_REQUEST_IDEMPOTENT_AGE_WITHDRAW = 11,
+  TEH_MT_REQUEST_IDEMPOTENT_MELT = 12,
+  TEH_MT_REQUEST_IDEMPOTENT_BATCH_WITHDRAW = 13,
+  TEH_MT_REQUEST_BATCH_DEPOSIT = 14,
+  TEH_MT_REQUEST_POLICY_FULFILLMENT = 15,
+  TEH_MT_REQUEST_COUNT = 16 /* MUST BE LAST! */
+};
+
+/**
+ * Success types for which we collect metrics.
+ */
+enum TEH_MetricTypeSuccess
+{
+  TEH_MT_SUCCESS_DEPOSIT = 0,
+  TEH_MT_SUCCESS_WITHDRAW = 1,
+  TEH_MT_SUCCESS_AGE_WITHDRAW = 2,
+  TEH_MT_SUCCESS_BATCH_WITHDRAW = 3,
+  TEH_MT_SUCCESS_MELT = 4,
+  TEH_MT_SUCCESS_REFRESH_REVEAL = 5,
+  TEH_MT_SUCCESS_AGE_WITHDRAW_REVEAL = 6,
+  TEH_MT_SUCCESS_COUNT = 7 /* MUST BE LAST! */
+};
+
+/**
+ * Cipher types for which we collect signature metrics.
+ */
+enum TEH_MetricTypeSignature
+{
+  TEH_MT_SIGNATURE_RSA = 0,
+  TEH_MT_SIGNATURE_CS = 1,
+  TEH_MT_SIGNATURE_EDDSA = 2,
+  TEH_MT_SIGNATURE_COUNT = 3
+};
+
+/**
+ * Cipher types for which we collect key exchange metrics.
+ */
+enum TEH_MetricTypeKeyX
+{
+  TEH_MT_KEYX_ECDH = 0,
+  TEH_MT_KEYX_COUNT = 1
+};
+
+/**
+ * Number of requests handled of the respective type.
+ */
+extern unsigned long long TEH_METRICS_num_requests[TEH_MT_REQUEST_COUNT];
+
+/**
+ * Number of successful requests handled of the respective type.
+ */
+extern unsigned long long TEH_METRICS_num_success[TEH_MT_SUCCESS_COUNT];
+
+/**
+ * Number of coins withdrawn in a batch-withdraw request
+ */
+extern unsigned long long TEH_METRICS_batch_withdraw_num_coins;
+
+/**
+ * Number of serialization errors encountered when
+ * handling requests of the respective type.
+ */
+extern unsigned long long TEH_METRICS_num_conflict[TEH_MT_REQUEST_COUNT];
+
+/**
+ * Number of signatures created by the respective cipher.
+ */
+extern unsigned long long TEH_METRICS_num_signatures[TEH_MT_SIGNATURE_COUNT];
+
+/**
+ * Number of signatures verified by the respective cipher.
+ */
+extern unsigned long long TEH_METRICS_num_verifications[TEH_MT_SIGNATURE_COUNT];
+
+/**
+ * Number of key exchanges done with the respective cipher.
+ */
+extern unsigned long long TEH_METRICS_num_keyexchanges[TEH_MT_KEYX_COUNT];
+
+/**
+ * Handle a "/metrics" request.
+ *
+ * @param rc request context
+ * @param args array of additional options (must be empty for this function)
+ * @return MHD result code
+ */
+MHD_RESULT
+TEH_handler_metrics (struct TEH_RequestContext *rc,
+                     const char *const args[]);
+
+
+#endif