From e91d46cdbbc97414968fa751fd1f596757c56875 Mon Sep 17 00:00:00 2001
From: Julius Bünger <buenger@mytum.de>
Date: Fri, 14 Sep 2018 00:38:45 +0200
Subject: Add API call to receive unbiased peer stream for debugging and
 profiling

---
 src/rps/rps_api.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 70 insertions(+), 1 deletion(-)

(limited to 'src/rps/rps_api.c')

diff --git a/src/rps/rps_api.c b/src/rps/rps_api.c
index ac462f3a0..b7644540d 100644
--- a/src/rps/rps_api.c
+++ b/src/rps/rps_api.c
@@ -61,9 +61,19 @@ struct GNUNET_RPS_Handle
   GNUNET_RPS_ViewUpdateCB view_update_cb;
 
   /**
-   * @brief Callback called on each update of the view
+   * @brief Closure to each requested update of the view
    */
   void *view_update_cls;
+
+  /**
+   * @brief Callback called on each peer of the biased input stream
+   */
+  GNUNET_RPS_StreamInputCB stream_input_cb;
+
+  /**
+   * @brief Closure to each requested peer from the biased stream
+   */
+  void *stream_input_cls;
 };
 
 
@@ -277,6 +287,37 @@ GNUNET_RPS_view_request (struct GNUNET_RPS_Handle *rps_handle,
   GNUNET_MQ_send (rps_handle->mq, ev);
 }
 
+
+/**
+ * Request biased stream of peers that are being put into the sampler
+ *
+ * @param rps_handle handle to the rps service
+ * @param num_req_peers number of peers we want to receive
+ *        (0 for infinite updates)
+ * @param cls a closure that will be given to the callback
+ * @param ready_cb the callback called when the peers are available
+ */
+void
+GNUNET_RPS_stream_request (struct GNUNET_RPS_Handle *rps_handle,
+                           uint32_t num_peers,
+                           GNUNET_RPS_StreamInputCB stream_input_cb,
+                           void *cls)
+{
+  struct GNUNET_MQ_Envelope *ev;
+  struct GNUNET_RPS_CS_DEBUG_StreamRequest *msg;
+
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       "Client requests %" PRIu32 " biased stream updates\n",
+       num_peers);
+  rps_handle->stream_input_cb = stream_input_cb;
+  rps_handle->stream_input_cls = cls;
+
+  ev = GNUNET_MQ_msg (msg, GNUNET_MESSAGE_TYPE_RPS_CS_DEBUG_STREAM_REQUEST);
+  msg->num_peers = htonl (num_peers);
+  GNUNET_MQ_send (rps_handle->mq, ev);
+}
+
+
 /**
  * This function is called, when the service updates the view.
  * It verifies that @a msg is well-formed.
@@ -303,6 +344,7 @@ check_view_update (void *cls,
   return GNUNET_OK;
 }
 
+
 /**
  * This function is called, when the service updated its view.
  * It calls the callback the caller provided
@@ -329,6 +371,29 @@ handle_view_update (void *cls,
 }
 
 
+/**
+ * This function is called, when the service sends another peer from the biased
+ * stream.
+ * It calls the callback the caller provided
+ * and disconnects afterwards.
+ *
+ * @param msg the message
+ */
+static void
+handle_stream_input (void *cls,
+                     const struct GNUNET_RPS_CS_DEBUG_StreamReply *msg)
+{
+  struct GNUNET_RPS_Handle *h = cls;
+
+  /* Give the peers back */
+  LOG (GNUNET_ERROR_TYPE_DEBUG,
+       "New peer of biased input stream\n");
+
+  GNUNET_assert (NULL != h);
+  GNUNET_assert (NULL != h->stream_input_cb);
+  h->stream_input_cb (h->stream_input_cb, &msg->peer);
+}
+
 
 /**
  * Reconnect to the service
@@ -379,6 +444,10 @@ reconnect (struct GNUNET_RPS_Handle *h)
                            GNUNET_MESSAGE_TYPE_RPS_CS_DEBUG_VIEW_REPLY,
                            struct GNUNET_RPS_CS_DEBUG_ViewReply,
                            h),
+    GNUNET_MQ_hd_fixed_size (stream_input,
+                             GNUNET_MESSAGE_TYPE_RPS_CS_DEBUG_STREAM_REPLY,
+                             struct GNUNET_RPS_CS_DEBUG_StreamReply,
+                             h),
     GNUNET_MQ_handler_end ()
   };
 
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