From bc38effeecf8300b99de2f367e01c9d02fcafb78 Mon Sep 17 00:00:00 2001 From: Bart Polot Date: Tue, 31 Jan 2017 02:58:54 +0100 Subject: [PATCH] Implement the connect and create_channel call for mq api --- src/cadet/cadet_api.c | 308 ++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 298 insertions(+), 10 deletions(-) diff --git a/src/cadet/cadet_api.c b/src/cadet/cadet_api.c index 2b50f781c..3491bd75f 100644 --- a/src/cadet/cadet_api.c +++ b/src/cadet/cadet_api.c @@ -38,6 +38,8 @@ /** * Transmission queue to the service + * + * @deprecated */ struct GNUNET_CADET_TransmitHandle { @@ -116,6 +118,11 @@ union CadetInfoCB */ struct GNUNET_CADET_Handle { + /** + * Flag to indicate old or MQ API. + */ + int mq_api; + /** * Message queue (if available). */ @@ -123,11 +130,15 @@ struct GNUNET_CADET_Handle /** * Set of handlers used for processing incoming messages in the channels + * + * @deprecated */ const struct GNUNET_CADET_MessageHandler *message_handlers; /** * Number of handlers in the handlers array. + * + * @deprecated */ unsigned int n_handlers; @@ -153,16 +164,22 @@ struct GNUNET_CADET_Handle /** * Closure for all the handlers given by the client + * + * @deprecated */ void *cls; /** * Messages to send to the service, head. + * + * @deprecated */ struct GNUNET_CADET_TransmitHandle *th_head; /** * Messages to send to the service, tail. + * + * @deprecated */ struct GNUNET_CADET_TransmitHandle *th_tail; @@ -241,9 +258,9 @@ struct GNUNET_CADET_Channel struct GNUNET_CADET_ClientChannelNumber ccn; /** - * Channel's port, if any. + * Channel's port, if incoming. */ - struct GNUNET_CADET_Port *port; + struct GNUNET_CADET_Port *incoming_port; /** * Other end of the channel. @@ -262,9 +279,30 @@ struct GNUNET_CADET_Channel /** * Are we allowed to send to the service? + * + * @deprecated */ unsigned int allow_send; + /****************************************************************************/ + /***************************** MQ ************************************/ + /****************************************************************************/ + + /** + * Message Queue for the channel. + */ + struct GNUNET_MQ_Handle *mq; + + /** + * Window change handler. + */ + GNUNET_CADET_WindowSizeEventHandler window_changes; + + /** + * Disconnect handler. + */ + GNUNET_CADET_DisconnectEventHandler disconnects; + }; @@ -611,7 +649,7 @@ handle_channel_created (void *cls, ch->peer = GNUNET_PEER_intern (&msg->peer); ch->cadet = h; ch->ccn = ccn; - ch->port = port; + ch->incoming_port = port; ch->options = ntohl (msg->opt); LOG (GNUNET_ERROR_TYPE_DEBUG, @@ -2047,9 +2085,9 @@ cadet_mq_ntr (void *cls, size_t size, * @param impl_state state of the implementation */ static void -cadet_mq_send_impl (struct GNUNET_MQ_Handle *mq, - const struct GNUNET_MessageHeader *msg, - void *impl_state) +cadet_mq_send_impl_old (struct GNUNET_MQ_Handle *mq, + const struct GNUNET_MessageHeader *msg, + void *impl_state) { struct CadetMQState *state = impl_state; @@ -2075,8 +2113,8 @@ cadet_mq_send_impl (struct GNUNET_MQ_Handle *mq, * @param impl_state state of the implementation */ static void -cadet_mq_destroy_impl (struct GNUNET_MQ_Handle *mq, - void *impl_state) +cadet_mq_destroy_impl_old (struct GNUNET_MQ_Handle *mq, + void *impl_state) { struct CadetMQState *state = impl_state; @@ -2104,8 +2142,8 @@ GNUNET_CADET_mq_create (struct GNUNET_CADET_Channel *channel) state = GNUNET_new (struct CadetMQState); state->channel = channel; - mq = GNUNET_MQ_queue_for_callbacks (&cadet_mq_send_impl, - &cadet_mq_destroy_impl, + mq = GNUNET_MQ_queue_for_callbacks (&cadet_mq_send_impl_old, + &cadet_mq_destroy_impl_old, NULL, /* FIXME: cancel impl. */ state, NULL, /* no msg handlers */ @@ -2136,3 +2174,253 @@ GC_u2h (uint32_t port) return &hash; } + + + +/******************************************************************************/ +/******************************* MQ-BASED API *********************************/ +/******************************************************************************/ + +/** + * Connect to the MQ-based cadet service. + * + * @param cfg Configuration to use. + * + * @return Handle to the cadet service NULL on error. + */ +struct GNUNET_CADET_Handle * +GNUNET_CADET_connecT (const struct GNUNET_CONFIGURATION_Handle *cfg) +{ + struct GNUNET_CADET_Handle *h; + + LOG (GNUNET_ERROR_TYPE_DEBUG, + "GNUNET_CADET_connecT()\n"); + h = GNUNET_new (struct GNUNET_CADET_Handle); + h->cfg = cfg; + h->mq_api = GNUNET_YES; + h->ports = GNUNET_CONTAINER_multihashmap_create (4, GNUNET_YES); + do_reconnect (h); + if (h->mq == NULL) + { + GNUNET_break (0); + GNUNET_CADET_disconnect (h); + return NULL; + } + h->next_ccn.channel_of_client = htonl (GNUNET_CADET_LOCAL_CHANNEL_ID_CLI); + h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS; + h->reconnect_task = NULL; + + return h; +} + + +/** + * Open a port to receive incomming MQ-based channels. + * + * @param h CADET handle. + * @param port Hash identifying the port. + * @param connects Function called when an incoming channel is connected. + * @param connects_cls Closure for the @a connects handler. + * @param window_changes Function called when the transmit window size changes. + * @param disconnects Function called when a channel is disconnected. + * @param handlers Callbacks for messages we care about, NULL-terminated. + * + * @return Port handle. + */ +struct GNUNET_CADET_Port * +GNUNET_CADET_open_porT (struct GNUNET_CADET_Handle *h, + const struct GNUNET_HashCode *port, + GNUNET_CADET_ConnectEventHandler connects, + void * connects_cls, + GNUNET_CADET_WindowSizeEventHandler window_changes, + GNUNET_CADET_DisconnectEventHandler disconnects, + const struct GNUNET_MQ_MessageHandler *handlers) +{ + return NULL; +} + + +/** + * Implement sending functionality of a message queue for + * us sending messages to a peer. + * + * Encapsulates the payload message in a #GNUNET_CADET_LocalData message + * in order to label the message with the channel ID and send the + * encapsulated message to the service. + * + * @param mq the message queue + * @param msg the message to send + * @param impl_state state of the implementation + */ +static void +cadet_mq_send_impl (struct GNUNET_MQ_Handle *mq, + const struct GNUNET_MessageHeader *msg, + void *impl_state) +{ + struct GNUNET_CADET_Channel *ch = impl_state; + struct GNUNET_CADET_Handle *h = ch->cadet; + uint16_t msize; + struct GNUNET_MQ_Envelope *env; + struct GNUNET_CADET_LocalData *cadet_msg; + + + if (NULL == h->mq) + { + /* We're currently reconnecting, pretend this worked */ + GNUNET_MQ_impl_send_continue (mq); + return; + } + + /* check message size for sanity */ + msize = ntohs (msg->size); + if (msize > GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE) + { + GNUNET_break (0); + GNUNET_MQ_impl_send_continue (mq); + return; + } + + env = GNUNET_MQ_msg_nested_mh (cadet_msg, + GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA, + msg); + cadet_msg->ccn = ch->ccn; + GNUNET_MQ_send (h->mq, env); + GNUNET_MQ_impl_send_continue (mq); +} + + +/** + * Handle destruction of a message queue. Implementations must not + * free @a mq, but should take care of @a impl_state. + * + * @param mq the message queue to destroy + * @param impl_state state of the implementation + */ +static void +cadet_mq_destroy_impl (struct GNUNET_MQ_Handle *mq, + void *impl_state) +{ + struct GNUNET_CADET_Channel *ch = impl_state; + + GNUNET_assert (mq == ch->mq); + ch->mq = NULL; +} + + +/** + * We had an error processing a message we forwarded from a peer to + * the CADET service. We should just complain about it but otherwise + * continue processing. + * + * @param cls closure + * @param error error code + */ +static void +cadet_mq_error_handler (void *cls, + enum GNUNET_MQ_Error error) +{ + GNUNET_break_op (0); +} + + +/** + * Implementation function that cancels the currently sent message. + * Should basically undo whatever #mq_send_impl() did. + * + * @param mq message queue + * @param impl_state state specific to the implementation + */ +static void +cadet_mq_cancel_impl (struct GNUNET_MQ_Handle *mq, + void *impl_state) +{ + struct GNUNET_CADET_Channel *ch = impl_state; + + LOG (GNUNET_ERROR_TYPE_WARNING, + "Cannot cancel mq message on channel %X of %p\n", + ch->ccn.channel_of_client, ch->cadet); + + GNUNET_break (0); +} + + +/** + * Create a new channel towards a remote peer. + * + * If the destination port is not open by any peer or the destination peer + * does not accept the channel, #GNUNET_CADET_ChannelEndHandler will be called + * for this channel. + * + * @param h CADET handle. + * @param channel_cls Closure for the channel. It's given to: + * - The disconnect handler @a disconnects + * - Each message type callback in @a handlers + * @param destination Peer identity the channel should go to. + * @param port Identification of the destination port. + * @param options CadetOption flag field, with all desired option bits set to 1. + * @param window_changes Function called when the transmit window size changes. + * @param disconnects Function called when the channel is disconnected. + * @param handlers Callbacks for messages we care about, NULL-terminated. + * + * @return Handle to the channel. + */ +struct GNUNET_CADET_Channel * +GNUNET_CADET_channel_creatE (struct GNUNET_CADET_Handle *h, + void *channel_cls, + const struct GNUNET_PeerIdentity *destination, + const struct GNUNET_HashCode *port, + enum GNUNET_CADET_ChannelOption options, + GNUNET_CADET_WindowSizeEventHandler window_changes, + GNUNET_CADET_DisconnectEventHandler disconnects, + const struct GNUNET_MQ_MessageHandler *handlers) +{ + struct GNUNET_CADET_Channel *ch; + struct GNUNET_CADET_ClientChannelNumber ccn; + struct GNUNET_CADET_LocalChannelCreateMessage *msg; + struct GNUNET_MQ_Envelope *env; + + /* Save parameters */ + ccn.channel_of_client = htonl (0); + ch = create_channel (h, ccn); + ch->ctx = channel_cls; + ch->peer = GNUNET_PEER_intern (destination); + ch->options = options; + ch->window_changes = window_changes; + ch->disconnects = disconnects; + + /* Create MQ for channel */ + ch->mq = GNUNET_MQ_queue_for_callbacks (&cadet_mq_send_impl, + &cadet_mq_destroy_impl, + &cadet_mq_cancel_impl, + ch, + handlers, + &cadet_mq_error_handler, + ch); + GNUNET_MQ_set_handlers_closure (ch->mq, channel_cls); + + /* Request channel creation to service */ + env = GNUNET_MQ_msg (msg, + GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_CREATE); + msg->ccn = ch->ccn; + msg->port = *port; + msg->peer = *destination; + msg->opt = htonl (options); + GNUNET_MQ_send (h->mq, + env); + + return ch; +} + + +/** + * Obtain the message queue for a connected peer. + * + * @param channel The channel handle from which to get the MQ. + * + * @return NULL if @a channel is not yet connected. + */ +struct GNUNET_MQ_Handle * +GNUNET_CADET_get_mq (const struct GNUNET_CADET_Channel *channel) +{ + return channel->mq; +} -- 2.25.1