109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
/* Copyright (C) 2010, 2011 Tony Garnock-Jones. All rights reserved. */
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <assert.h>
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#include <ucontext.h>
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#include "cmsg_private.h"
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#include "harness.h"
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#include "ref.h"
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#include "sexp.h"
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#include "hashtable.h"
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#include "node.h"
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#include "subscription.h"
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typedef struct fanout_extension_t_ {
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sexp_t *name;
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hashtable_t subscriptions;
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} fanout_extension_t;
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static sexp_t *fanout_extend(node_t *n, sexp_t *args) {
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if ((sexp_length(args) == 1) && sexp_stringp(sexp_head(args))) {
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cmsg_bytes_t name = sexp_data(sexp_head(args));
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fanout_extension_t *f = calloc(1, sizeof(*f));
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f->name = INCREF(sexp_head(args));
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init_hashtable(&f->subscriptions, 5, NULL, (void (*)(void *)) free_subscription);
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n->extension = f;
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return bind_node(name, n) ? NULL : sexp_cstring("bind failed");
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} else {
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return sexp_cstring("invalid args");
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}
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}
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static void fanout_destructor(node_t *n) {
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fanout_extension_t *f = n->extension;
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if (f != NULL) { /* can be NULL if fanout_extend was given invalid args */
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DECREF(f->name, sexp_destructor);
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destroy_hashtable(&f->subscriptions);
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free(f);
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}
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}
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struct delivery_context {
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fanout_extension_t *f;
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sexp_t *body;
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};
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static void send_to_sub(void *contextv, cmsg_bytes_t key, void *subv) {
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struct delivery_context *context = contextv;
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subscription_t *sub = subv;
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send_to_subscription(context->f->name, &context->f->subscriptions, sub, context->body);
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}
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static void fanout_handle_message(node_t *n, sexp_t *m) {
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fanout_extension_t *f = n->extension;
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size_t msglen = sexp_length(m);
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sexp_t *args;
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cmsg_bytes_t selector;
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if (msglen == 0 || !sexp_stringp(sexp_head(m))) {
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warn("Invalid message in fanout\n");
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return;
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}
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selector = sexp_data(sexp_head(m));
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args = sexp_tail(m);
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if ((msglen == 4) && !cmsg_bytes_cmp(selector, cmsg_cstring_bytes("post"))) {
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struct delivery_context context;
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context.f = f;
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context.body = sexp_listref(args, 1);
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hashtable_foreach(&f->subscriptions, send_to_sub, &context);
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return;
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}
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if ((msglen == 6) && !cmsg_bytes_cmp(selector, cmsg_cstring_bytes("subscribe"))) {
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handle_subscribe_message(f->name, &f->subscriptions, args);
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return;
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}
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if ((msglen == 2) && !cmsg_bytes_cmp(selector, cmsg_cstring_bytes("unsubscribe"))) {
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handle_unsubscribe_message(f->name, &f->subscriptions, args);
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return;
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}
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warn("Message not understood in fanout; selector <<%.*s>>, length %u\n",
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selector.len, selector.bytes,
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msglen);
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}
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static node_class_t fanout_class = {
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.name = "fanout",
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.extend = fanout_extend,
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.destroy = fanout_destructor,
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.handle_message = fanout_handle_message
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};
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void init_fanout(void) {
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register_node_class(&fanout_class);
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}
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