starting to use stream in fs

git-svn-id: https://gnunet.org/svn/gnunet@25106 140774ce-b5e7-0310-ab8b-a85725594a96

8 files changed, 278 insertions, 4 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 08b93efb0b..9a240c8c67 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -52,11 +52,11 @@ SUBDIRS = \
   dht \
   hostlist \
   topology \
-  fs \
   regex \
   mesh \
   lockmanager \
   stream \
+  fs \
   $(LINUX_DIR) \
   $(MINGW_DIR) \
   integration-tests \
diff --git a/src/fs/Makefile.am b/src/fs/Makefile.am
index f7af076823..419e878d6d 100644
--- a/src/fs/Makefile.am
+++ b/src/fs/Makefile.am
@@ -164,13 +164,15 @@ gnunet_service_fs_SOURCES =  \
  gnunet-service-fs_pe.c gnunet-service-fs_pe.h \
  gnunet-service-fs_pr.c gnunet-service-fs_pr.h \
  gnunet-service-fs_push.c gnunet-service-fs_push.h \
- gnunet-service-fs_put.c gnunet-service-fs_put.h 
+ gnunet-service-fs_put.c gnunet-service-fs_put.h \
+ gnunet-service-fs_stream.c gnunet-service-fs_sream.h 
 gnunet_service_fs_LDADD =  \
  $(top_builddir)/src/fs/libgnunetfs.la \
  $(top_builddir)/src/dht/libgnunetdht.la \
  $(top_builddir)/src/block/libgnunetblock.la \
  $(top_builddir)/src/datastore/libgnunetdatastore.la \
  $(top_builddir)/src/statistics/libgnunetstatistics.la \
+ $(top_builddir)/src/stream/libgnunetstream.la \
  $(top_builddir)/src/ats/libgnunetats.la \
  $(top_builddir)/src/core/libgnunetcore.la \
  $(top_builddir)/src/util/libgnunetutil.la \
diff --git a/src/fs/gnunet-service-fs.c b/src/fs/gnunet-service-fs.c
index a129288abc..3a8a076f65 100644
--- a/src/fs/gnunet-service-fs.c
+++ b/src/fs/gnunet-service-fs.c
@@ -46,6 +46,7 @@
 #include "gnunet-service-fs_pr.h"
 #include "gnunet-service-fs_push.h"
 #include "gnunet-service-fs_put.h"
+#include "gnunet-service-fs_stream.h"
 #include "fs.h"
 
 /**
@@ -439,6 +440,7 @@ handle_start_search (void *cls, struct GNUNET_SERVER_Client *client,
 static void
 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
 {
+  GSF_stream_stop ();
   if (NULL != GSF_core)
   {
     GNUNET_CORE_disconnect (GSF_core);
@@ -595,6 +597,7 @@ main_init (struct GNUNET_SERVER_Handle *server,
       GNUNET_SCHEDULER_add_delayed (COVER_AGE_FREQUENCY, &age_cover_counters,
                                     NULL);
   datastore_get_load = GNUNET_LOAD_value_init (DATASTORE_LOAD_AUTODECLINE);
+  GSF_stream_start ();
   GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
                                 NULL);
   return GNUNET_OK;
diff --git a/src/fs/gnunet-service-fs_stream.c b/src/fs/gnunet-service-fs_stream.c
new file mode 100644
index 0000000000..befa90dd5d
--- /dev/null
+++ b/src/fs/gnunet-service-fs_stream.c
@@ -0,0 +1,219 @@
+/*
+     This file is part of GNUnet.
+     (C) 2012 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 fs/gnunet-service-fs_stream.c
+ * @brief non-anonymous file-transfer
+ * @author Christian Grothoff
+ *
+ * TODO:
+ * - limit # concurrent clients, timeout for read
+ */
+#include "platform.h"
+#include "gnunet_constants.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_stream_lib.h"
+#include "gnunet_protocols.h"
+#include "gnunet_applications.h"
+#include "gnunet-service-fs.h"
+#include "gnunet-service-fs_stream.h"
+
+/**
+ * Information we keep around for each active streaming client.
+ */
+struct StreamClient
+{
+  /**
+   * DLL
+   */ 
+  struct StreamClient *next;
+
+  /**
+   * DLL
+   */ 
+  struct StreamClient *prev;
+
+  /**
+   * Socket for communication.
+   */ 
+  struct GNUNET_STREAM_Socket *socket;
+
+  /**
+   * Handle for active read operation, or NULL.
+   */ 
+  struct GNUNET_STREAM_IOReadHandle *rh;
+
+  /**
+   * Handle for active write operation, or NULL.
+   */ 
+  struct GNUNET_STREAM_IOWriteHandle *wh;
+  
+  /**
+   * Size of the last write that was initiated.
+   */ 
+  size_t reply_size;
+
+};
+
+
+/**
+ * Listen socket for incoming requests.
+ */
+static struct GNUNET_STREAM_ListenSocket *listen_socket;
+
+/**
+ * Head of DLL of stream clients.
+ */ 
+static struct StreamClient *sc_head;
+
+/**
+ * Tail of DLL of stream clients.
+ */ 
+static struct StreamClient *sc_tail;
+
+
+/**
+ * We're done with a particular client, clean up.
+ *
+ * @param sc client to clean up
+ */
+static void
+terminate_stream (struct StreamClient *sc)
+{
+  if (NULL != sc->rh)
+    GNUNET_STREAM_io_read_cancel (sc->rh);
+  if (NULL != sc->wh)
+    GNUNET_STREAM_io_write_cancel (sc->wh);
+  GNUNET_STREAM_close (sc->socket);
+  GNUNET_CONTAINER_DLL_remove (sc_head,
+			       sc_tail,
+			       sc);
+  GNUNET_free (sc);
+}
+
+
+/**
+ * Functions of this signature are called whenever data is available from the
+ * stream.
+ *
+ * @param cls the closure from GNUNET_STREAM_read
+ * @param status the status of the stream at the time this function is called
+ * @param data traffic from the other side
+ * @param size the number of bytes available in data read; will be 0 on timeout 
+ * @return number of bytes of processed from 'data' (any data remaining should be
+ *         given to the next time the read processor is called).
+ */
+static size_t 
+process_request (void *cls,
+		 enum GNUNET_STREAM_Status status,
+		 const void *data,
+		 size_t size)
+{
+  struct StreamClient *sc = cls;
+
+  sc->rh = NULL;
+  switch (status)
+  {
+  case GNUNET_STREAM_OK:
+    // fixme: handle request...
+    break;
+  case GNUNET_STREAM_TIMEOUT:
+  case GNUNET_STREAM_SHUTDOWN:
+  case GNUNET_STREAM_SYSERR:
+  case GNUNET_STREAM_BROKEN:
+    terminate_stream (sc);
+    return size;
+  default:
+    GNUNET_break (0);
+    return size;
+  }
+  sc->rh = GNUNET_STREAM_read (sc->socket,
+			       GNUNET_TIME_UNIT_FOREVER_REL,
+			       &process_request,
+			       sc);
+  return size;
+}
+
+
+/**
+ * Functions of this type are called upon new stream connection from other peers
+ * or upon binding error which happen when the app_port given in
+ * GNUNET_STREAM_listen() is already taken.
+ *
+ * @param cls the closure from GNUNET_STREAM_listen
+ * @param socket the socket representing the stream; NULL on binding error
+ * @param initiator the identity of the peer who wants to establish a stream
+ *            with us; NULL on binding error
+ * @return GNUNET_OK to keep the socket open, GNUNET_SYSERR to close the
+ *             stream (the socket will be invalid after the call)
+ */
+static int 
+accept_cb (void *cls,
+	   struct GNUNET_STREAM_Socket *socket,
+	   const struct GNUNET_PeerIdentity *initiator)
+{
+  struct StreamClient *sc;
+
+  if (NULL == socket)
+    return GNUNET_SYSERR;
+  sc = GNUNET_malloc (sizeof (struct StreamClient));
+  sc->socket = socket;
+  sc->rh = GNUNET_STREAM_read (sc->socket,
+			       GNUNET_TIME_UNIT_FOREVER_REL,
+			       &process_request,
+			       sc);
+  GNUNET_CONTAINER_DLL_insert (sc_head,
+			       sc_tail,
+			       sc);
+  return GNUNET_OK;
+}
+
+
+/**
+ * Initialize subsystem for non-anonymous file-sharing.
+ */
+void
+GSF_stream_start ()
+{
+  listen_socket = GNUNET_STREAM_listen (GSF_cfg,
+					GNUNET_APPLICATION_TYPE_FS_BLOCK_TRANSFER,
+					&accept_cb, NULL,
+					GNUNET_STREAM_OPTION_END);
+}
+
+
+/**
+ * Shutdown subsystem for non-anonymous file-sharing.
+ */
+void
+GSF_stream_stop ()
+{
+  struct StreamClient *sc;
+
+  while (NULL != (sc = sc_head))
+    terminate_stream (sc);
+  if (NULL != listen_socket)
+  {
+    GNUNET_STREAM_listen_close (listen_socket);
+    listen_socket = NULL;
+  }
+}
+
+/* end of gnunet-service-fs_stream.c */
diff --git a/src/fs/gnunet-service-fs_stream.h b/src/fs/gnunet-service-fs_stream.h
new file mode 100644
index 0000000000..daa617290e
--- /dev/null
+++ b/src/fs/gnunet-service-fs_stream.h
@@ -0,0 +1,42 @@
+/*
+     This file is part of GNUnet.
+     (C) 2012 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 fs/gnunet-service-fs_stream.h
+ * @brief non-anonymous file-transfer
+ * @author Christian Grothoff
+ */
+#ifndef GNUNET_SERVICE_FS_STREAM_H
+#define GNUNET_SERVICE_FS_STREAM_H
+
+/**
+ * Initialize subsystem for non-anonymous file-sharing.
+ */
+void
+GSF_stream_start (void);
+
+
+/**
+ * Shutdown subsystem for non-anonymous file-sharing.
+ */
+void
+GSF_stream_stop (void);
+
+#endif
diff --git a/src/include/gnunet_applications.h b/src/include/gnunet_applications.h
index 1e9db3e724..142194ec0f 100644
--- a/src/include/gnunet_applications.h
+++ b/src/include/gnunet_applications.h
@@ -50,6 +50,10 @@ extern "C"
  */
 #define GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER 2
 
+/**
+ * Transfer of blocks for non-anonymmous file-sharing.
+ */
+#define GNUNET_APPLICATION_TYPE_FS_BLOCK_TRANSFER 3
 
 /**
  * Internet IPv4 gateway (any TCP/UDP/ICMP).
diff --git a/src/include/gnunet_stream_lib.h b/src/include/gnunet_stream_lib.h
index 5d5307f5fd..b7e3e4ce27 100644
--- a/src/include/gnunet_stream_lib.h
+++ b/src/include/gnunet_stream_lib.h
@@ -66,6 +66,7 @@ enum GNUNET_STREAM_Status
     
     /**
      * An error resulted in an unusable stream
+     * FIXME: status code unused?
      */
     GNUNET_STREAM_BROKEN
   };
diff --git a/src/stream/stream_api.c b/src/stream/stream_api.c
index fd2f86e51b..46f7abb476 100644
--- a/src/stream/stream_api.c
+++ b/src/stream/stream_api.c
@@ -34,7 +34,6 @@
  * @author Sree Harsha Totakura
  */
 
-
 #include "platform.h"
 #include "gnunet_common.h"
 #include "gnunet_crypto_lib.h"
@@ -1918,6 +1917,8 @@ handle_receive_close (struct GNUNET_STREAM_Socket *socket,
      that that stream has been shutdown */
   if (NULL != socket->write_handle)
   {
+    // FIXME: this breaks if 'write_cont' decides to 
+    // call SOCKET_close!
     if (NULL != socket->write_handle->write_cont)
       socket->write_handle->write_cont (socket->write_handle->write_cont_cls,
                                         GNUNET_STREAM_SHUTDOWN, 0);
@@ -2040,6 +2041,8 @@ handle_close (struct GNUNET_STREAM_Socket *socket,
      that that stream has been shutdown */
   if (NULL != socket->write_handle)
   {
+    // FIXME: this breaks if 'write_cont' decides to 
+    // call SOCKET_close!
     if (NULL != socket->write_handle->write_cont)
       socket->write_handle->write_cont (socket->write_handle->write_cont_cls,
                                         GNUNET_STREAM_SHUTDOWN, 0);
@@ -3543,11 +3546,11 @@ GNUNET_STREAM_read (struct GNUNET_STREAM_Socket *socket,
   case STATE_RECEIVE_CLOSE_WAIT:
   case STATE_CLOSED:
   case STATE_CLOSE_WAIT:
-    proc (proc_cls, GNUNET_STREAM_SHUTDOWN, NULL, 0);
     LOG (GNUNET_ERROR_TYPE_DEBUG,
          "%s: %s() END\n",
          GNUNET_i2s (&socket->other_peer),
          __func__);
+    proc (proc_cls, GNUNET_STREAM_SHUTDOWN, NULL, 0);
     return NULL;
   default:
     break;