| /* |
| Copyright (c) 2013 GoPivotal, Inc. All rights reserved. |
| |
| Permission is hereby granted, free of charge, to any person obtaining a copy |
| of this software and associated documentation files (the "Software"), |
| to deal in the Software without restriction, including without limitation |
| the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| and/or sell copies of the Software, and to permit persons to whom |
| the Software is furnished to do so, subject to the following conditions: |
| |
| The above copyright notice and this permission notice shall be included |
| in all copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
| IN THE SOFTWARE. |
| */ |
| |
| #include "xmaster.h" |
| |
| #include "../../nn.h" |
| #include "../../sync.h" |
| |
| #include "../utils/dist.h" |
| |
| #include "../../utils/err.h" |
| #include "../../utils/cont.h" |
| #include "../../utils/fast.h" |
| #include "../../utils/alloc.h" |
| #include "../../utils/list.h" |
| #include "../../utils/msg.h" |
| |
| #include <string.h> |
| |
| struct nn_xmaster_data { |
| struct nn_dist_data dist; |
| |
| /* If set to 1 it represents a new connection where the state haven't |
| been sent yet. 0 otherwise. */ |
| int fresh; |
| }; |
| |
| struct nn_xmaster { |
| struct nn_sockbase sockbase; |
| struct nn_dist dist; |
| struct nn_msg cache; |
| }; |
| |
| /* Private functions. */ |
| static void nn_xmaster_init (struct nn_xmaster *self, |
| const struct nn_sockbase_vfptr *vfptr, void *hint); |
| static void nn_xmaster_term (struct nn_xmaster *self); |
| |
| /* Implementation of nn_sockbase's virtual functions. */ |
| static void nn_xmaster_destroy (struct nn_sockbase *self); |
| static int nn_xmaster_add (struct nn_sockbase *self, struct nn_pipe *pipe); |
| static void nn_xmaster_rm (struct nn_sockbase *self, struct nn_pipe *pipe); |
| static void nn_xmaster_in (struct nn_sockbase *self, struct nn_pipe *pipe); |
| static void nn_xmaster_out (struct nn_sockbase *self, struct nn_pipe *pipe); |
| static int nn_xmaster_events (struct nn_sockbase *self); |
| static int nn_xmaster_send (struct nn_sockbase *self, struct nn_msg *msg); |
| static int nn_xmaster_setopt (struct nn_sockbase *self, int level, int option, |
| const void *optval, size_t optvallen); |
| static int nn_xmaster_getopt (struct nn_sockbase *self, int level, int option, |
| void *optval, size_t *optvallen); |
| static const struct nn_sockbase_vfptr nn_xmaster_sockbase_vfptr = { |
| NULL, |
| nn_xmaster_destroy, |
| nn_xmaster_add, |
| nn_xmaster_rm, |
| nn_xmaster_in, |
| nn_xmaster_out, |
| nn_xmaster_events, |
| nn_xmaster_send, |
| NULL, |
| nn_xmaster_setopt, |
| nn_xmaster_getopt |
| }; |
| |
| static void nn_xmaster_init (struct nn_xmaster *self, |
| const struct nn_sockbase_vfptr *vfptr, void *hint) |
| { |
| nn_sockbase_init (&self->sockbase, vfptr, hint); |
| nn_dist_init (&self->dist); |
| nn_msg_init (&self->cache, 0); |
| } |
| |
| static void nn_xmaster_term (struct nn_xmaster *self) |
| { |
| nn_msg_term (&self->cache); |
| nn_dist_term (&self->dist); |
| nn_sockbase_term (&self->sockbase); |
| } |
| |
| void nn_xmaster_destroy (struct nn_sockbase *self) |
| { |
| struct nn_xmaster *xmaster; |
| |
| xmaster = nn_cont (self, struct nn_xmaster, sockbase); |
| |
| nn_xmaster_term (xmaster); |
| nn_free (xmaster); |
| } |
| |
| static int nn_xmaster_add (struct nn_sockbase *self, struct nn_pipe *pipe) |
| { |
| int rc; |
| struct nn_xmaster *xmaster; |
| struct nn_xmaster_data *data; |
| int sndprio; |
| size_t sz; |
| |
| xmaster = nn_cont (self, struct nn_xmaster, sockbase); |
| |
| data = nn_alloc (sizeof (struct nn_xmaster_data), "pipe data (master)"); |
| alloc_assert (data); |
| data->fresh = 1; |
| nn_pipe_setdata (pipe, data); |
| nn_dist_add (&xmaster->dist, pipe, &data->dist); |
| |
| return 0; |
| } |
| |
| static void nn_xmaster_rm (struct nn_sockbase *self, struct nn_pipe *pipe) |
| { |
| struct nn_xmaster *xmaster; |
| struct nn_xmaster_data *data; |
| |
| xmaster = nn_cont (self, struct nn_xmaster, sockbase); |
| data = nn_pipe_getdata (pipe); |
| nn_dist_rm (&xmaster->dist, pipe, &data->dist); |
| nn_free (data); |
| } |
| |
| static void nn_xmaster_in (struct nn_sockbase *self, struct nn_pipe *pipe) |
| { |
| /* We are not going to receive any messages, so there's no need to store |
| the list of inbound pipes. */ |
| } |
| |
| static void nn_xmaster_out (struct nn_sockbase *self, struct nn_pipe *pipe) |
| { |
| int rc; |
| struct nn_xmaster *xmaster; |
| struct nn_xmaster_data *data; |
| |
| xmaster = nn_cont (self, struct nn_xmaster, sockbase); |
| data = nn_pipe_getdata (pipe); |
| |
| /* Send the state to newly established pipe. */ |
| if (data->fresh) { |
| rc = nn_pipe_send (pipe, &xmaster->cache); |
| errnum_assert (rc >= 0, -rc); |
| data->fresh = 0; |
| if (rc & NN_PIPE_RELEASE) |
| return; |
| } |
| |
| nn_dist_out (&xmaster->dist, pipe, &data->dist); |
| } |
| |
| static int nn_xmaster_events (struct nn_sockbase *self) |
| { |
| return NN_SOCKBASE_EVENT_OUT; |
| } |
| |
| static int nn_xmaster_send (struct nn_sockbase *self, struct nn_msg *msg) |
| { |
| struct nn_xmaster *xmaster; |
| |
| xmaster = nn_cont (self, struct nn_xmaster, sockbase); |
| |
| /* Check whether new state is the same as the old one. |
| If so, do nothing. */ |
| if (nn_chunkref_size (&xmaster->cache.body) == nn_chunkref_size (&msg->body) |
| && memcmp (nn_chunkref_data (&xmaster->cache.body), |
| nn_chunkref_data (&msg->body), nn_chunkref_size (&msg->body)) == 0) |
| return 0; |
| |
| /* Overwrite the cache by the new state. */ |
| nn_msg_term (&xmaster->cache); |
| nn_msg_cp (&xmaster->cache, msg); |
| |
| /* Distribute the new state to all the mirrors. */ |
| return nn_dist_send (&xmaster->dist, msg, NULL); |
| } |
| |
| static int nn_xmaster_setopt (struct nn_sockbase *self, int level, |
| int option, const void *optval, size_t optvallen) |
| { |
| return -ENOPROTOOPT; |
| } |
| |
| static int nn_xmaster_getopt (struct nn_sockbase *self, int level, |
| int option, void *optval, size_t *optvallen) |
| { |
| return -ENOPROTOOPT; |
| } |
| |
| int nn_xmaster_create (void *hint, struct nn_sockbase **sockbase) |
| { |
| struct nn_xmaster *self; |
| |
| self = nn_alloc (sizeof (struct nn_xmaster), "socket (master)"); |
| alloc_assert (self); |
| nn_xmaster_init (self, &nn_xmaster_sockbase_vfptr, hint); |
| *sockbase = &self->sockbase; |
| |
| return 0; |
| } |
| |
| int nn_xmaster_ispeer (int socktype) |
| { |
| return socktype == NN_MIRROR ? 1 : 0; |
| } |
| |
| static struct nn_socktype nn_xmaster_socktype_struct = { |
| AF_SP_RAW, |
| NN_MASTER, |
| NN_SOCKTYPE_FLAG_NORECV, |
| nn_xmaster_create, |
| nn_xmaster_ispeer, |
| NN_LIST_ITEM_INITIALIZER |
| }; |
| |
| struct nn_socktype *nn_xmaster_socktype = &nn_xmaster_socktype_struct; |
| |