new fragmentation API design - with retransmit

4 files changed, 368 insertions, 11 deletions

diff --git a/src/fragmentation/Makefile.am b/src/fragmentation/Makefile.am
index 5b1367260..15e356fcc 100644
--- a/src/fragmentation/Makefile.am
+++ b/src/fragmentation/Makefile.am
@@ -11,20 +11,21 @@ endif
 lib_LTLIBRARIES = libgnunetfragmentation.la
 
 libgnunetfragmentation_la_SOURCES = \
-  fragmentation.c 
+  fragmentation_new.c \
+  defragmentation_new.c 
 libgnunetfragmentation_la_LIBADD = \
  $(top_builddir)/src/util/libgnunetutil.la  
 
-check_PROGRAMS = \
- test_fragmentation
+#check_PROGRAMS = \
+# test_fragmentation
 
-if ENABLE_TEST_RUN
-TESTS = $(check_PROGRAMS)
-endif
+#if ENABLE_TEST_RUN
+#TESTS = $(check_PROGRAMS)
+#endif
 
-test_fragmentation_SOURCES = \
- test_frag_ji.c
-test_fragmentation_LDADD = \
- $(top_builddir)/src/fragmentation/libgnunetfragmentation.la \
- $(top_builddir)/src/util/libgnunetutil.la  
+#test_fragmentation_SOURCES = \
+# test_frag_ji.c
+#test_fragmentation_LDADD = \
+# $(top_builddir)/src/fragmentation/libgnunetfragmentation.la \
+# $(top_builddir)/src/util/libgnunetutil.la  
 
diff --git a/src/fragmentation/defragmentation_new.c b/src/fragmentation/defragmentation_new.c
new file mode 100644
index 000000000..8fdc334d9
--- /dev/null
+++ b/src/fragmentation/defragmentation_new.c
@@ -0,0 +1,109 @@
+/*
+     This file is part of GNUnet
+     (C) 2009, 2011 Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet 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
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+/**
+ * @file src/fragmentation/defragmentation_new.c
+ * @brief library to help defragment messages
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet_fragmentation_lib.h"
+#include "fragmentation.h"
+
+/**
+ * Defragmentation context.
+ */
+struct GNUNET_DEFRAGMENT_Context
+{
+
+  /**
+   * For statistics.
+   */
+  struct GNUNET_STATISTICS_Handle *stats;
+
+  /**
+   * Closure for 'proc' and 'ackp'.
+   */
+  void *cls;
+
+  /**
+   * Function to call with defragmented messages.
+   */
+  GNUNET_FRAGMENT_MessageProcessor proc;
+
+  /**
+   * Function to call with acknowledgements.
+   */
+  GNUNET_FRAGMENT_MessageProcessor ackp;
+};
+
+
+/**
+ * Create a defragmentation context.
+ *
+ * @param stats statistics context
+ * @param cls closure for proc and ackp
+ * @param proc function to call with defragmented messages
+ * @param ackp function to call with acknowledgements (to send
+ *             back to the other side)
+ * @return the defragmentation context
+ */
+struct GNUNET_DEFRAGMENT_Context *
+GNUNET_DEFRAGMENT_context_create (struct GNUNET_STATISTICS_Handle *stats,
+                                  void *cls,
+                                  GNUNET_FRAGMENT_MessageProcessor proc,
+                                  GNUNET_FRAGMENT_MessageProcessor ackp)
+{
+  struct GNUNET_DEFRAGMENT_Context *dc;
+
+  dc = GNUNET_malloc (sizeof (struct GNUNET_DEFRAGMENT_Context));
+  dc->stats = stats;
+  dc->cls = cls;
+  dc->proc = proc;
+  dc->ackp = ackp;
+  return dc;
+}
+
+
+/**
+ * Destroy the given defragmentation context.
+ *
+ * @param dc defragmentation context
+ */
+void 
+GNUNET_DEFRAGMENT_context_destroy (struct GNUNET_DEFRAGMENT_Context *dc)
+{
+  GNUNET_free (dc);
+}
+
+
+/**
+ * We have received a fragment.  Process it.
+ *
+ * @param dc the context
+ * @param msg the message that was received
+ */
+void 
+GNUNET_DEFRAGMENT_process_fragment (struct GNUNET_DEFRAGMENT_Context *dc,
+                                    const struct GNUNET_MessageHeader *msg)
+{
+}
+
+/* end of defragmentation_new.c */
+
diff --git a/src/fragmentation/fragmentation.h b/src/fragmentation/fragmentation.h
new file mode 100644
index 000000000..e9b3faba5
--- /dev/null
+++ b/src/fragmentation/fragmentation.h
@@ -0,0 +1,52 @@
+/*
+     This file is part of GNUnet
+     (C) 2009, 2011 Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet 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
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+/**
+ * @file src/fragmentation/fragmentation.h
+ * @brief library to help fragment messages
+ * @author Christian Grothoff
+ */
+#ifndef FRAGMENTATION_H
+#define FRAGMENTATION_H
+#include "platform.h"
+#include "gnunet_fragmentation_lib.h"
+
+/**
+ * Header for a message fragment.
+ */
+struct FragmentHeader
+{
+
+  struct GNUNET_MessageHeader header;
+
+};
+
+
+/**
+ * Message fragment acknowledgement.
+ */
+struct FragmentAcknowledgement
+{
+
+  struct GNUNET_MessageHeader header;
+
+};
+
+
+#endif
diff --git a/src/fragmentation/fragmentation_new.c b/src/fragmentation/fragmentation_new.c
new file mode 100644
index 000000000..a95afc4a4
--- /dev/null
+++ b/src/fragmentation/fragmentation_new.c
@@ -0,0 +1,195 @@
+/*
+     This file is part of GNUnet
+     (C) 2009, 2011 Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet 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
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+/**
+ * @file src/fragmentation/fragmentation_new.c
+ * @brief library to help fragment messages
+ * @author Christian Grothoff
+ */
+
+#include "platform.h"
+#include "gnunet_fragmentation_lib.h"
+#include "fragmentation.h"
+
+/**
+ * Fragmentation context.
+ */
+struct GNUNET_FRAGMENT_Context
+{
+  /**
+   * Statistics to use.
+   */
+  struct GNUNET_STATISTICS_Handle *stats;
+
+  /**
+   * Tracker for flow control.
+   */
+  struct GNUNET_BANDWIDTH_Tracker *tracker;
+
+  /**
+   * Current expected delay for ACKs.
+   */
+  struct GNUNET_TIME_Relative delay;
+
+  /**
+   * Message to fragment (allocated at the end of this struct).
+   */
+  const struct GNUNET_MessageHeader *msg;
+
+  /**
+   * Function to call for transmissions.
+   */
+  GNUNET_FRAGMENT_MessageProcessor proc;
+
+  /**
+   * Closure for 'proc'.
+   */
+  void *proc_cls;
+
+  /**
+   * Bitfield, set to 1 for each unacknowledged fragment.
+   */
+  uint64_t acks;
+
+  /**
+   * Task performing work for the fragmenter.
+   */
+  GNUNET_SCHEDULER_TaskIdentifier task;
+
+  /**
+   * Target fragment size.
+   */
+  uint16_t mtu;
+  
+};
+
+
+/**
+ * Transmit the next fragment to the other peer.
+ *
+ * @param cls the 'struct GNUNET_FRAGMENT_Context'
+ * @param tc scheduler context
+ */
+static void
+transmit_next (void *cls,
+               const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  struct GNUNET_FRAGMENT_Context *fc = cls;
+
+  fc->task = GNUNET_SCHEDULER_NO_TASK;
+}
+
+
+/**
+ * Create a fragmentation context for the given message.
+ * Fragments the message into fragments of size "mtu" or
+ * less.  Calls 'proc' on each un-acknowledged fragment,
+ * using both the expected 'delay' between messages and
+ * acknowledgements and the given 'tracker' to guide the
+ * frequency of calls to 'proc'.
+ *
+ * @param stats statistics context
+ * @param mtu the maximum message size for each fragment
+ * @param tracker bandwidth tracker to use for flow control (can be NULL)
+ * @param delay expected delay between fragment transmission
+ *              and ACK based on previous messages
+ * @param msg the message to fragment
+ * @param proc function to call for each fragment to transmit
+ * @param proc_cls closure for proc
+ * @return the fragmentation context
+ */
+struct GNUNET_FRAGMENT_Context *
+GNUNET_FRAGMENT_context_create (struct GNUNET_STATISTICS_Handle *stats,
+                                uint16_t mtu,
+                                struct GNUNET_BANDWIDTH_Tracker *tracker,
+                                struct GNUNET_TIME_Relative delay,
+                                const struct GNUNET_MessageHeader *msg,
+                                GNUNET_FRAGMENT_MessageProcessor proc,
+                                void *proc_cls)
+{
+  struct GNUNET_FRAGMENT_Context *fc;
+  size_t size;
+  uint64_t bits;
+  
+  GNUNET_assert (mtu >= 1024 + sizeof (struct FragmentHeader));
+  size = ntohs (msg->size);
+  GNUNET_assert (size > mtu);
+  fc = GNUNET_malloc (sizeof (struct GNUNET_FRAGMENT_Context) + size);
+  fc->stats = stats;
+  fc->mtu = mtu;
+  fc->tracker = tracker;
+  fc->delay = delay;
+  fc->msg = (const struct GNUNET_MessageHeader*)&fc[1];
+  fc->proc = proc;
+  fc->proc_cls = proc_cls;
+  memcpy (&fc[1], msg, size);
+  bits = (size + mtu - 1) / (mtu - sizeof (struct FragmentHeader));
+  GNUNET_assert (bits <= 64);
+  if (bits == 64)
+    fc->acks = UINT64_MAX;      /* set all 64 bit */
+  else
+    fc->acks = (1 << bits) - 1; /* set lowest 'bits' bit */
+  fc->task = GNUNET_SCHEDULER_add_delayed (GNUNET_BANDWIDTH_tracker_get_delay (tracker, mtu),
+                                           &transmit_next,
+                                           fc);
+  return fc;
+}
+
+
+/**
+ * Process an acknowledgement message we got from the other
+ * side (to control re-transmits).
+ *
+ * @param fc fragmentation context
+ * @param msg acknowledgement message we received
+ * @return GNUNET_OK if this ack completes the work of the 'fc'
+ *                   (all fragments have been received);
+ *         GNUNET_NO if more messages are pending
+ *         GNUNET_SYSERR if this ack is not valid for this fc
+ */
+int 
+GNUNET_FRAGMENT_process_ack (struct GNUNET_FRAGMENT_Context *fc,
+                             const struct GNUNET_MessageHeader *msg)
+{
+  return GNUNET_SYSERR;
+}
+
+
+/**
+ * Destroy the given fragmentation context (stop calling 'proc', free
+ * resources).
+ *
+ * @param fc fragmentation context
+ * @return average delay between transmission and ACK for the
+ *         last message, FOREVER if the message was not fully transmitted
+ */
+struct GNUNET_TIME_Relative
+GNUNET_FRAGMENT_context_destroy (struct GNUNET_FRAGMENT_Context *fc)
+{
+  struct GNUNET_TIME_Relative ret;
+
+  if (fc->task != GNUNET_SCHEDULER_NO_TASK)
+    GNUNET_SCHEDULER_cancel (fc->task);
+  ret = fc->delay;
+  GNUNET_free (fc);
+  return ret;
+}
+
+/* end of fragmentation_new.c */
+