| /* |
| Copyright (c) 2012-2013 Martin Sustrik All rights reserved. |
| Copyright 2016 Garrett D'Amore <garrett@damore.org> |
| |
| 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 "xrespondent.h" |
| |
| #include "../../nn.h" |
| #include "../../survey.h" |
| |
| #include "../../utils/err.h" |
| #include "../../utils/cont.h" |
| #include "../../utils/fast.h" |
| #include "../../utils/alloc.h" |
| #include "../../utils/wire.h" |
| |
| #include <string.h> |
| |
| #define NN_RESPONDENT_INPROGRESS 1 |
| |
| struct nn_respondent { |
| struct nn_xrespondent xrespondent; |
| uint32_t flags; |
| struct nn_chunkref backtrace; |
| }; |
| |
| /* Private functions. */ |
| static void nn_respondent_init (struct nn_respondent *self, |
| const struct nn_sockbase_vfptr *vfptr, void *hint); |
| static void nn_respondent_term (struct nn_respondent *self); |
| |
| /* Implementation of nn_sockbase's virtual functions. */ |
| static void nn_respondent_destroy (struct nn_sockbase *self); |
| static int nn_respondent_events (struct nn_sockbase *self); |
| static int nn_respondent_send (struct nn_sockbase *self, struct nn_msg *msg); |
| static int nn_respondent_recv (struct nn_sockbase *self, struct nn_msg *msg); |
| static const struct nn_sockbase_vfptr nn_respondent_sockbase_vfptr = { |
| NULL, |
| nn_respondent_destroy, |
| nn_xrespondent_add, |
| nn_xrespondent_rm, |
| nn_xrespondent_in, |
| nn_xrespondent_out, |
| nn_respondent_events, |
| nn_respondent_send, |
| nn_respondent_recv, |
| NULL, |
| NULL |
| }; |
| |
| static void nn_respondent_init (struct nn_respondent *self, |
| const struct nn_sockbase_vfptr *vfptr, void *hint) |
| { |
| nn_xrespondent_init (&self->xrespondent, vfptr, hint); |
| self->flags = 0; |
| } |
| |
| static void nn_respondent_term (struct nn_respondent *self) |
| { |
| if (self->flags & NN_RESPONDENT_INPROGRESS) |
| nn_chunkref_term (&self->backtrace); |
| nn_xrespondent_term (&self->xrespondent); |
| } |
| |
| void nn_respondent_destroy (struct nn_sockbase *self) |
| { |
| struct nn_respondent *respondent; |
| |
| respondent = nn_cont (self, struct nn_respondent, xrespondent.sockbase); |
| |
| nn_respondent_term (respondent); |
| nn_free (respondent); |
| } |
| |
| static int nn_respondent_events (struct nn_sockbase *self) |
| { |
| int events; |
| struct nn_respondent *respondent; |
| |
| respondent = nn_cont (self, struct nn_respondent, xrespondent.sockbase); |
| |
| events = nn_xrespondent_events (&respondent->xrespondent.sockbase); |
| if (!(respondent->flags & NN_RESPONDENT_INPROGRESS)) |
| events &= ~NN_SOCKBASE_EVENT_OUT; |
| return events; |
| } |
| |
| static int nn_respondent_send (struct nn_sockbase *self, struct nn_msg *msg) |
| { |
| int rc; |
| struct nn_respondent *respondent; |
| |
| respondent = nn_cont (self, struct nn_respondent, xrespondent.sockbase); |
| |
| /* If there's no survey going on, report EFSM error. */ |
| if (nn_slow (!(respondent->flags & NN_RESPONDENT_INPROGRESS))) |
| return -EFSM; |
| |
| /* Tag the message with survey ID. */ |
| nn_assert (nn_chunkref_size (&msg->sphdr) == 0); |
| nn_chunkref_term (&msg->sphdr); |
| nn_chunkref_mv (&msg->sphdr, &respondent->backtrace); |
| |
| /* Remember that no survey is being processed. */ |
| respondent->flags &= ~NN_RESPONDENT_INPROGRESS; |
| |
| /* Try to send the message. If it cannot be sent due to pushback, drop it |
| silently. */ |
| rc = nn_xrespondent_send (&respondent->xrespondent.sockbase, msg); |
| errnum_assert (rc == 0 || rc == -EAGAIN, -rc); |
| |
| return 0; |
| } |
| |
| static int nn_respondent_recv (struct nn_sockbase *self, struct nn_msg *msg) |
| { |
| int rc; |
| struct nn_respondent *respondent; |
| |
| respondent = nn_cont (self, struct nn_respondent, xrespondent.sockbase); |
| |
| /* Cancel current survey and clean up backtrace, if it exists. */ |
| if (nn_slow (respondent->flags & NN_RESPONDENT_INPROGRESS)) { |
| nn_chunkref_term (&respondent->backtrace); |
| respondent->flags &= ~NN_RESPONDENT_INPROGRESS; |
| } |
| |
| /* Get next survey. */ |
| rc = nn_xrespondent_recv (&respondent->xrespondent.sockbase, msg); |
| if (nn_slow (rc == -EAGAIN)) |
| return -EAGAIN; |
| errnum_assert (rc == 0, -rc); |
| |
| /* Store the backtrace. */ |
| nn_chunkref_mv (&respondent->backtrace, &msg->sphdr); |
| nn_chunkref_init (&msg->sphdr, 0); |
| |
| /* Remember that survey is being processed. */ |
| respondent->flags |= NN_RESPONDENT_INPROGRESS; |
| |
| return 0; |
| } |
| |
| static int nn_respondent_create (void *hint, struct nn_sockbase **sockbase) |
| { |
| struct nn_respondent *self; |
| |
| self = nn_alloc (sizeof (struct nn_respondent), "socket (respondent)"); |
| alloc_assert (self); |
| nn_respondent_init (self, &nn_respondent_sockbase_vfptr, hint); |
| *sockbase = &self->xrespondent.sockbase; |
| |
| return 0; |
| } |
| |
| struct nn_socktype nn_respondent_socktype = { |
| AF_SP, |
| NN_RESPONDENT, |
| 0, |
| nn_respondent_create, |
| nn_xrespondent_ispeer, |
| }; |