michael@0: /*
michael@0:  * Copyright (c) 2000-2007 Niels Provos <provos@citi.umich.edu>
michael@0:  * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
michael@0:  *
michael@0:  * Redistribution and use in source and binary forms, with or without
michael@0:  * modification, are permitted provided that the following conditions
michael@0:  * are met:
michael@0:  * 1. Redistributions of source code must retain the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer.
michael@0:  * 2. Redistributions in binary form must reproduce the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer in the
michael@0:  *    documentation and/or other materials provided with the distribution.
michael@0:  * 3. The name of the author may not be used to endorse or promote products
michael@0:  *    derived from this software without specific prior written permission.
michael@0:  *
michael@0:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
michael@0:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
michael@0:  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
michael@0:  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
michael@0:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
michael@0:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
michael@0:  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
michael@0:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
michael@0:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
michael@0:  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
michael@0:  */
michael@0: #include "event2/event-config.h"
michael@0: 
michael@0: #ifdef WIN32
michael@0: #define WIN32_LEAN_AND_MEAN
michael@0: #include <winsock2.h>
michael@0: #include <windows.h>
michael@0: #undef WIN32_LEAN_AND_MEAN
michael@0: #endif
michael@0: 
michael@0: #include <sys/types.h>
michael@0: #ifndef WIN32
michael@0: #include <sys/socket.h>
michael@0: #endif
michael@0: #ifdef _EVENT_HAVE_SYS_TIME_H
michael@0: #include <sys/time.h>
michael@0: #endif
michael@0: #include <sys/queue.h>
michael@0: #include <stdio.h>
michael@0: #include <stdlib.h>
michael@0: #ifndef WIN32
michael@0: #include <unistd.h>
michael@0: #endif
michael@0: #include <errno.h>
michael@0: #include <signal.h>
michael@0: #include <string.h>
michael@0: 
michael@0: #include <sys/queue.h>
michael@0: 
michael@0: #include "event2/event.h"
michael@0: #include "event2/event_struct.h"
michael@0: #include "event2/rpc.h"
michael@0: #include "event2/rpc_struct.h"
michael@0: #include "evrpc-internal.h"
michael@0: #include "event2/http.h"
michael@0: #include "event2/buffer.h"
michael@0: #include "event2/tag.h"
michael@0: #include "event2/http_struct.h"
michael@0: #include "event2/http_compat.h"
michael@0: #include "event2/util.h"
michael@0: #include "util-internal.h"
michael@0: #include "log-internal.h"
michael@0: #include "mm-internal.h"
michael@0: 
michael@0: struct evrpc_base *
michael@0: evrpc_init(struct evhttp *http_server)
michael@0: {
michael@0: 	struct evrpc_base* base = mm_calloc(1, sizeof(struct evrpc_base));
michael@0: 	if (base == NULL)
michael@0: 		return (NULL);
michael@0: 
michael@0: 	/* we rely on the tagging sub system */
michael@0: 	evtag_init();
michael@0: 
michael@0: 	TAILQ_INIT(&base->registered_rpcs);
michael@0: 	TAILQ_INIT(&base->input_hooks);
michael@0: 	TAILQ_INIT(&base->output_hooks);
michael@0: 
michael@0: 	TAILQ_INIT(&base->paused_requests);
michael@0: 
michael@0: 	base->http_server = http_server;
michael@0: 
michael@0: 	return (base);
michael@0: }
michael@0: 
michael@0: void
michael@0: evrpc_free(struct evrpc_base *base)
michael@0: {
michael@0: 	struct evrpc *rpc;
michael@0: 	struct evrpc_hook *hook;
michael@0: 	struct evrpc_hook_ctx *pause;
michael@0: 	int r;
michael@0: 
michael@0: 	while ((rpc = TAILQ_FIRST(&base->registered_rpcs)) != NULL) {
michael@0: 		r = evrpc_unregister_rpc(base, rpc->uri);
michael@0: 		EVUTIL_ASSERT(r == 0);
michael@0: 	}
michael@0: 	while ((pause = TAILQ_FIRST(&base->paused_requests)) != NULL) {
michael@0: 		TAILQ_REMOVE(&base->paused_requests, pause, next);
michael@0: 		mm_free(pause);
michael@0: 	}
michael@0: 	while ((hook = TAILQ_FIRST(&base->input_hooks)) != NULL) {
michael@0: 		r = evrpc_remove_hook(base, EVRPC_INPUT, hook);
michael@0: 		EVUTIL_ASSERT(r);
michael@0: 	}
michael@0: 	while ((hook = TAILQ_FIRST(&base->output_hooks)) != NULL) {
michael@0: 		r = evrpc_remove_hook(base, EVRPC_OUTPUT, hook);
michael@0: 		EVUTIL_ASSERT(r);
michael@0: 	}
michael@0: 	mm_free(base);
michael@0: }
michael@0: 
michael@0: void *
michael@0: evrpc_add_hook(void *vbase,
michael@0:     enum EVRPC_HOOK_TYPE hook_type,
michael@0:     int (*cb)(void *, struct evhttp_request *, struct evbuffer *, void *),
michael@0:     void *cb_arg)
michael@0: {
michael@0: 	struct _evrpc_hooks *base = vbase;
michael@0: 	struct evrpc_hook_list *head = NULL;
michael@0: 	struct evrpc_hook *hook = NULL;
michael@0: 	switch (hook_type) {
michael@0: 	case EVRPC_INPUT:
michael@0: 		head = &base->in_hooks;
michael@0: 		break;
michael@0: 	case EVRPC_OUTPUT:
michael@0: 		head = &base->out_hooks;
michael@0: 		break;
michael@0: 	default:
michael@0: 		EVUTIL_ASSERT(hook_type == EVRPC_INPUT || hook_type == EVRPC_OUTPUT);
michael@0: 	}
michael@0: 
michael@0: 	hook = mm_calloc(1, sizeof(struct evrpc_hook));
michael@0: 	EVUTIL_ASSERT(hook != NULL);
michael@0: 
michael@0: 	hook->process = cb;
michael@0: 	hook->process_arg = cb_arg;
michael@0: 	TAILQ_INSERT_TAIL(head, hook, next);
michael@0: 
michael@0: 	return (hook);
michael@0: }
michael@0: 
michael@0: static int
michael@0: evrpc_remove_hook_internal(struct evrpc_hook_list *head, void *handle)
michael@0: {
michael@0: 	struct evrpc_hook *hook = NULL;
michael@0: 	TAILQ_FOREACH(hook, head, next) {
michael@0: 		if (hook == handle) {
michael@0: 			TAILQ_REMOVE(head, hook, next);
michael@0: 			mm_free(hook);
michael@0: 			return (1);
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	return (0);
michael@0: }
michael@0: 
michael@0: /*
michael@0:  * remove the hook specified by the handle
michael@0:  */
michael@0: 
michael@0: int
michael@0: evrpc_remove_hook(void *vbase, enum EVRPC_HOOK_TYPE hook_type, void *handle)
michael@0: {
michael@0: 	struct _evrpc_hooks *base = vbase;
michael@0: 	struct evrpc_hook_list *head = NULL;
michael@0: 	switch (hook_type) {
michael@0: 	case EVRPC_INPUT:
michael@0: 		head = &base->in_hooks;
michael@0: 		break;
michael@0: 	case EVRPC_OUTPUT:
michael@0: 		head = &base->out_hooks;
michael@0: 		break;
michael@0: 	default:
michael@0: 		EVUTIL_ASSERT(hook_type == EVRPC_INPUT || hook_type == EVRPC_OUTPUT);
michael@0: 	}
michael@0: 
michael@0: 	return (evrpc_remove_hook_internal(head, handle));
michael@0: }
michael@0: 
michael@0: static int
michael@0: evrpc_process_hooks(struct evrpc_hook_list *head, void *ctx,
michael@0:     struct evhttp_request *req, struct evbuffer *evbuf)
michael@0: {
michael@0: 	struct evrpc_hook *hook;
michael@0: 	TAILQ_FOREACH(hook, head, next) {
michael@0: 		int res = hook->process(ctx, req, evbuf, hook->process_arg);
michael@0: 		if (res != EVRPC_CONTINUE)
michael@0: 			return (res);
michael@0: 	}
michael@0: 
michael@0: 	return (EVRPC_CONTINUE);
michael@0: }
michael@0: 
michael@0: static void evrpc_pool_schedule(struct evrpc_pool *pool);
michael@0: static void evrpc_request_cb(struct evhttp_request *, void *);
michael@0: 
michael@0: /*
michael@0:  * Registers a new RPC with the HTTP server.   The evrpc object is expected
michael@0:  * to have been filled in via the EVRPC_REGISTER_OBJECT macro which in turn
michael@0:  * calls this function.
michael@0:  */
michael@0: 
michael@0: static char *
michael@0: evrpc_construct_uri(const char *uri)
michael@0: {
michael@0: 	char *constructed_uri;
michael@0: 	size_t constructed_uri_len;
michael@0: 
michael@0: 	constructed_uri_len = strlen(EVRPC_URI_PREFIX) + strlen(uri) + 1;
michael@0: 	if ((constructed_uri = mm_malloc(constructed_uri_len)) == NULL)
michael@0: 		event_err(1, "%s: failed to register rpc at %s",
michael@0: 		    __func__, uri);
michael@0: 	memcpy(constructed_uri, EVRPC_URI_PREFIX, strlen(EVRPC_URI_PREFIX));
michael@0: 	memcpy(constructed_uri + strlen(EVRPC_URI_PREFIX), uri, strlen(uri));
michael@0: 	constructed_uri[constructed_uri_len - 1] = '\0';
michael@0: 
michael@0: 	return (constructed_uri);
michael@0: }
michael@0: 
michael@0: int
michael@0: evrpc_register_rpc(struct evrpc_base *base, struct evrpc *rpc,
michael@0:     void (*cb)(struct evrpc_req_generic *, void *), void *cb_arg)
michael@0: {
michael@0: 	char *constructed_uri = evrpc_construct_uri(rpc->uri);
michael@0: 
michael@0: 	rpc->base = base;
michael@0: 	rpc->cb = cb;
michael@0: 	rpc->cb_arg = cb_arg;
michael@0: 
michael@0: 	TAILQ_INSERT_TAIL(&base->registered_rpcs, rpc, next);
michael@0: 
michael@0: 	evhttp_set_cb(base->http_server,
michael@0: 	    constructed_uri,
michael@0: 	    evrpc_request_cb,
michael@0: 	    rpc);
michael@0: 
michael@0: 	mm_free(constructed_uri);
michael@0: 
michael@0: 	return (0);
michael@0: }
michael@0: 
michael@0: int
michael@0: evrpc_unregister_rpc(struct evrpc_base *base, const char *name)
michael@0: {
michael@0: 	char *registered_uri = NULL;
michael@0: 	struct evrpc *rpc;
michael@0: 	int r;
michael@0: 
michael@0: 	/* find the right rpc; linear search might be slow */
michael@0: 	TAILQ_FOREACH(rpc, &base->registered_rpcs, next) {
michael@0: 		if (strcmp(rpc->uri, name) == 0)
michael@0: 			break;
michael@0: 	}
michael@0: 	if (rpc == NULL) {
michael@0: 		/* We did not find an RPC with this name */
michael@0: 		return (-1);
michael@0: 	}
michael@0: 	TAILQ_REMOVE(&base->registered_rpcs, rpc, next);
michael@0: 
michael@0: 	registered_uri = evrpc_construct_uri(name);
michael@0: 
michael@0: 	/* remove the http server callback */
michael@0: 	r = evhttp_del_cb(base->http_server, registered_uri);
michael@0: 	EVUTIL_ASSERT(r == 0);
michael@0: 
michael@0: 	mm_free(registered_uri);
michael@0: 
michael@0: 	mm_free((char *)rpc->uri);
michael@0: 	mm_free(rpc);
michael@0: 	return (0);
michael@0: }
michael@0: 
michael@0: static int evrpc_pause_request(void *vbase, void *ctx,
michael@0:     void (*cb)(void *, enum EVRPC_HOOK_RESULT));
michael@0: static void evrpc_request_cb_closure(void *, enum EVRPC_HOOK_RESULT);
michael@0: 
michael@0: static void
michael@0: evrpc_request_cb(struct evhttp_request *req, void *arg)
michael@0: {
michael@0: 	struct evrpc *rpc = arg;
michael@0: 	struct evrpc_req_generic *rpc_state = NULL;
michael@0: 
michael@0: 	/* let's verify the outside parameters */
michael@0: 	if (req->type != EVHTTP_REQ_POST ||
michael@0: 	    evbuffer_get_length(req->input_buffer) <= 0)
michael@0: 		goto error;
michael@0: 
michael@0: 	rpc_state = mm_calloc(1, sizeof(struct evrpc_req_generic));
michael@0: 	if (rpc_state == NULL)
michael@0: 		goto error;
michael@0: 	rpc_state->rpc = rpc;
michael@0: 	rpc_state->http_req = req;
michael@0: 	rpc_state->rpc_data = NULL;
michael@0: 
michael@0: 	if (TAILQ_FIRST(&rpc->base->input_hooks) != NULL) {
michael@0: 		int hook_res;
michael@0: 
michael@0: 		evrpc_hook_associate_meta(&rpc_state->hook_meta, req->evcon);
michael@0: 
michael@0: 		/*
michael@0: 		 * allow hooks to modify the outgoing request
michael@0: 		 */
michael@0: 		hook_res = evrpc_process_hooks(&rpc->base->input_hooks,
michael@0: 		    rpc_state, req, req->input_buffer);
michael@0: 		switch (hook_res) {
michael@0: 		case EVRPC_TERMINATE:
michael@0: 			goto error;
michael@0: 		case EVRPC_PAUSE:
michael@0: 			evrpc_pause_request(rpc->base, rpc_state,
michael@0: 			    evrpc_request_cb_closure);
michael@0: 			return;
michael@0: 		case EVRPC_CONTINUE:
michael@0: 			break;
michael@0: 		default:
michael@0: 			EVUTIL_ASSERT(hook_res == EVRPC_TERMINATE ||
michael@0: 			    hook_res == EVRPC_CONTINUE ||
michael@0: 			    hook_res == EVRPC_PAUSE);
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	evrpc_request_cb_closure(rpc_state, EVRPC_CONTINUE);
michael@0: 	return;
michael@0: 
michael@0: error:
michael@0: 	if (rpc_state != NULL)
michael@0: 		evrpc_reqstate_free(rpc_state);
michael@0: 	evhttp_send_error(req, HTTP_SERVUNAVAIL, NULL);
michael@0: 	return;
michael@0: }
michael@0: 
michael@0: static void
michael@0: evrpc_request_cb_closure(void *arg, enum EVRPC_HOOK_RESULT hook_res)
michael@0: {
michael@0: 	struct evrpc_req_generic *rpc_state = arg;
michael@0: 	struct evrpc *rpc;
michael@0: 	struct evhttp_request *req;
michael@0: 
michael@0: 	EVUTIL_ASSERT(rpc_state);
michael@0: 	rpc = rpc_state->rpc;
michael@0: 	req = rpc_state->http_req;
michael@0: 
michael@0: 	if (hook_res == EVRPC_TERMINATE)
michael@0: 		goto error;
michael@0: 
michael@0: 	/* let's check that we can parse the request */
michael@0: 	rpc_state->request = rpc->request_new(rpc->request_new_arg);
michael@0: 	if (rpc_state->request == NULL)
michael@0: 		goto error;
michael@0: 
michael@0: 	if (rpc->request_unmarshal(
michael@0: 		    rpc_state->request, req->input_buffer) == -1) {
michael@0: 		/* we failed to parse the request; that's a bummer */
michael@0: 		goto error;
michael@0: 	}
michael@0: 
michael@0: 	/* at this point, we have a well formed request, prepare the reply */
michael@0: 
michael@0: 	rpc_state->reply = rpc->reply_new(rpc->reply_new_arg);
michael@0: 	if (rpc_state->reply == NULL)
michael@0: 		goto error;
michael@0: 
michael@0: 	/* give the rpc to the user; they can deal with it */
michael@0: 	rpc->cb(rpc_state, rpc->cb_arg);
michael@0: 
michael@0: 	return;
michael@0: 
michael@0: error:
michael@0: 	if (rpc_state != NULL)
michael@0: 		evrpc_reqstate_free(rpc_state);
michael@0: 	evhttp_send_error(req, HTTP_SERVUNAVAIL, NULL);
michael@0: 	return;
michael@0: }
michael@0: 
michael@0: 
michael@0: void
michael@0: evrpc_reqstate_free(struct evrpc_req_generic* rpc_state)
michael@0: {
michael@0: 	struct evrpc *rpc;
michael@0: 	EVUTIL_ASSERT(rpc_state != NULL);
michael@0: 	rpc = rpc_state->rpc;
michael@0: 
michael@0: 	/* clean up all memory */
michael@0: 	if (rpc_state->hook_meta != NULL)
michael@0: 		evrpc_hook_context_free(rpc_state->hook_meta);
michael@0: 	if (rpc_state->request != NULL)
michael@0: 		rpc->request_free(rpc_state->request);
michael@0: 	if (rpc_state->reply != NULL)
michael@0: 		rpc->reply_free(rpc_state->reply);
michael@0: 	if (rpc_state->rpc_data != NULL)
michael@0: 		evbuffer_free(rpc_state->rpc_data);
michael@0: 	mm_free(rpc_state);
michael@0: }
michael@0: 
michael@0: static void
michael@0: evrpc_request_done_closure(void *, enum EVRPC_HOOK_RESULT);
michael@0: 
michael@0: void
michael@0: evrpc_request_done(struct evrpc_req_generic *rpc_state)
michael@0: {
michael@0: 	struct evhttp_request *req;
michael@0: 	struct evrpc *rpc;
michael@0: 
michael@0: 	EVUTIL_ASSERT(rpc_state);
michael@0: 
michael@0: 	req = rpc_state->http_req;
michael@0: 	rpc = rpc_state->rpc;
michael@0: 
michael@0: 	if (rpc->reply_complete(rpc_state->reply) == -1) {
michael@0: 		/* the reply was not completely filled in.  error out */
michael@0: 		goto error;
michael@0: 	}
michael@0: 
michael@0: 	if ((rpc_state->rpc_data = evbuffer_new()) == NULL) {
michael@0: 		/* out of memory */
michael@0: 		goto error;
michael@0: 	}
michael@0: 
michael@0: 	/* serialize the reply */
michael@0: 	rpc->reply_marshal(rpc_state->rpc_data, rpc_state->reply);
michael@0: 
michael@0: 	if (TAILQ_FIRST(&rpc->base->output_hooks) != NULL) {
michael@0: 		int hook_res;
michael@0: 
michael@0: 		evrpc_hook_associate_meta(&rpc_state->hook_meta, req->evcon);
michael@0: 
michael@0: 		/* do hook based tweaks to the request */
michael@0: 		hook_res = evrpc_process_hooks(&rpc->base->output_hooks,
michael@0: 		    rpc_state, req, rpc_state->rpc_data);
michael@0: 		switch (hook_res) {
michael@0: 		case EVRPC_TERMINATE:
michael@0: 			goto error;
michael@0: 		case EVRPC_PAUSE:
michael@0: 			if (evrpc_pause_request(rpc->base, rpc_state,
michael@0: 				evrpc_request_done_closure) == -1)
michael@0: 				goto error;
michael@0: 			return;
michael@0: 		case EVRPC_CONTINUE:
michael@0: 			break;
michael@0: 		default:
michael@0: 			EVUTIL_ASSERT(hook_res == EVRPC_TERMINATE ||
michael@0: 			    hook_res == EVRPC_CONTINUE ||
michael@0: 			    hook_res == EVRPC_PAUSE);
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	evrpc_request_done_closure(rpc_state, EVRPC_CONTINUE);
michael@0: 	return;
michael@0: 
michael@0: error:
michael@0: 	if (rpc_state != NULL)
michael@0: 		evrpc_reqstate_free(rpc_state);
michael@0: 	evhttp_send_error(req, HTTP_SERVUNAVAIL, NULL);
michael@0: 	return;
michael@0: }
michael@0: 
michael@0: void *
michael@0: evrpc_get_request(struct evrpc_req_generic *req)
michael@0: {
michael@0: 	return req->request;
michael@0: }
michael@0: 
michael@0: void *
michael@0: evrpc_get_reply(struct evrpc_req_generic *req)
michael@0: {
michael@0: 	return req->reply;
michael@0: }
michael@0: 
michael@0: static void
michael@0: evrpc_request_done_closure(void *arg, enum EVRPC_HOOK_RESULT hook_res)
michael@0: {
michael@0: 	struct evrpc_req_generic *rpc_state = arg;
michael@0: 	struct evhttp_request *req;
michael@0: 	EVUTIL_ASSERT(rpc_state);
michael@0: 	req = rpc_state->http_req;
michael@0: 
michael@0: 	if (hook_res == EVRPC_TERMINATE)
michael@0: 		goto error;
michael@0: 
michael@0: 	/* on success, we are going to transmit marshaled binary data */
michael@0: 	if (evhttp_find_header(req->output_headers, "Content-Type") == NULL) {
michael@0: 		evhttp_add_header(req->output_headers,
michael@0: 		    "Content-Type", "application/octet-stream");
michael@0: 	}
michael@0: 	evhttp_send_reply(req, HTTP_OK, "OK", rpc_state->rpc_data);
michael@0: 
michael@0: 	evrpc_reqstate_free(rpc_state);
michael@0: 
michael@0: 	return;
michael@0: 
michael@0: error:
michael@0: 	if (rpc_state != NULL)
michael@0: 		evrpc_reqstate_free(rpc_state);
michael@0: 	evhttp_send_error(req, HTTP_SERVUNAVAIL, NULL);
michael@0: 	return;
michael@0: }
michael@0: 
michael@0: 
michael@0: /* Client implementation of RPC site */
michael@0: 
michael@0: static int evrpc_schedule_request(struct evhttp_connection *connection,
michael@0:     struct evrpc_request_wrapper *ctx);
michael@0: 
michael@0: struct evrpc_pool *
michael@0: evrpc_pool_new(struct event_base *base)
michael@0: {
michael@0: 	struct evrpc_pool *pool = mm_calloc(1, sizeof(struct evrpc_pool));
michael@0: 	if (pool == NULL)
michael@0: 		return (NULL);
michael@0: 
michael@0: 	TAILQ_INIT(&pool->connections);
michael@0: 	TAILQ_INIT(&pool->requests);
michael@0: 
michael@0: 	TAILQ_INIT(&pool->paused_requests);
michael@0: 
michael@0: 	TAILQ_INIT(&pool->input_hooks);
michael@0: 	TAILQ_INIT(&pool->output_hooks);
michael@0: 
michael@0: 	pool->base = base;
michael@0: 	pool->timeout = -1;
michael@0: 
michael@0: 	return (pool);
michael@0: }
michael@0: 
michael@0: static void
michael@0: evrpc_request_wrapper_free(struct evrpc_request_wrapper *request)
michael@0: {
michael@0: 	if (request->hook_meta != NULL)
michael@0: 		evrpc_hook_context_free(request->hook_meta);
michael@0: 	mm_free(request->name);
michael@0: 	mm_free(request);
michael@0: }
michael@0: 
michael@0: void
michael@0: evrpc_pool_free(struct evrpc_pool *pool)
michael@0: {
michael@0: 	struct evhttp_connection *connection;
michael@0: 	struct evrpc_request_wrapper *request;
michael@0: 	struct evrpc_hook_ctx *pause;
michael@0: 	struct evrpc_hook *hook;
michael@0: 	int r;
michael@0: 
michael@0: 	while ((request = TAILQ_FIRST(&pool->requests)) != NULL) {
michael@0: 		TAILQ_REMOVE(&pool->requests, request, next);
michael@0: 		evrpc_request_wrapper_free(request);
michael@0: 	}
michael@0: 
michael@0: 	while ((pause = TAILQ_FIRST(&pool->paused_requests)) != NULL) {
michael@0: 		TAILQ_REMOVE(&pool->paused_requests, pause, next);
michael@0: 		mm_free(pause);
michael@0: 	}
michael@0: 
michael@0: 	while ((connection = TAILQ_FIRST(&pool->connections)) != NULL) {
michael@0: 		TAILQ_REMOVE(&pool->connections, connection, next);
michael@0: 		evhttp_connection_free(connection);
michael@0: 	}
michael@0: 
michael@0: 	while ((hook = TAILQ_FIRST(&pool->input_hooks)) != NULL) {
michael@0: 		r = evrpc_remove_hook(pool, EVRPC_INPUT, hook);
michael@0: 		EVUTIL_ASSERT(r);
michael@0: 	}
michael@0: 
michael@0: 	while ((hook = TAILQ_FIRST(&pool->output_hooks)) != NULL) {
michael@0: 		r = evrpc_remove_hook(pool, EVRPC_OUTPUT, hook);
michael@0: 		EVUTIL_ASSERT(r);
michael@0: 	}
michael@0: 
michael@0: 	mm_free(pool);
michael@0: }
michael@0: 
michael@0: /*
michael@0:  * Add a connection to the RPC pool.   A request scheduled on the pool
michael@0:  * may use any available connection.
michael@0:  */
michael@0: 
michael@0: void
michael@0: evrpc_pool_add_connection(struct evrpc_pool *pool,
michael@0:     struct evhttp_connection *connection)
michael@0: {
michael@0: 	EVUTIL_ASSERT(connection->http_server == NULL);
michael@0: 	TAILQ_INSERT_TAIL(&pool->connections, connection, next);
michael@0: 
michael@0: 	/*
michael@0: 	 * associate an event base with this connection
michael@0: 	 */
michael@0: 	if (pool->base != NULL)
michael@0: 		evhttp_connection_set_base(connection, pool->base);
michael@0: 
michael@0: 	/*
michael@0: 	 * unless a timeout was specifically set for a connection,
michael@0: 	 * the connection inherits the timeout from the pool.
michael@0: 	 */
michael@0: 	if (connection->timeout == -1)
michael@0: 		connection->timeout = pool->timeout;
michael@0: 
michael@0: 	/*
michael@0: 	 * if we have any requests pending, schedule them with the new
michael@0: 	 * connections.
michael@0: 	 */
michael@0: 
michael@0: 	if (TAILQ_FIRST(&pool->requests) != NULL) {
michael@0: 		struct evrpc_request_wrapper *request =
michael@0: 		    TAILQ_FIRST(&pool->requests);
michael@0: 		TAILQ_REMOVE(&pool->requests, request, next);
michael@0: 		evrpc_schedule_request(connection, request);
michael@0: 	}
michael@0: }
michael@0: 
michael@0: void
michael@0: evrpc_pool_remove_connection(struct evrpc_pool *pool,
michael@0:     struct evhttp_connection *connection)
michael@0: {
michael@0: 	TAILQ_REMOVE(&pool->connections, connection, next);
michael@0: }
michael@0: 
michael@0: void
michael@0: evrpc_pool_set_timeout(struct evrpc_pool *pool, int timeout_in_secs)
michael@0: {
michael@0: 	struct evhttp_connection *evcon;
michael@0: 	TAILQ_FOREACH(evcon, &pool->connections, next) {
michael@0: 		evcon->timeout = timeout_in_secs;
michael@0: 	}
michael@0: 	pool->timeout = timeout_in_secs;
michael@0: }
michael@0: 
michael@0: 
michael@0: static void evrpc_reply_done(struct evhttp_request *, void *);
michael@0: static void evrpc_request_timeout(evutil_socket_t, short, void *);
michael@0: 
michael@0: /*
michael@0:  * Finds a connection object associated with the pool that is currently
michael@0:  * idle and can be used to make a request.
michael@0:  */
michael@0: static struct evhttp_connection *
michael@0: evrpc_pool_find_connection(struct evrpc_pool *pool)
michael@0: {
michael@0: 	struct evhttp_connection *connection;
michael@0: 	TAILQ_FOREACH(connection, &pool->connections, next) {
michael@0: 		if (TAILQ_FIRST(&connection->requests) == NULL)
michael@0: 			return (connection);
michael@0: 	}
michael@0: 
michael@0: 	return (NULL);
michael@0: }
michael@0: 
michael@0: /*
michael@0:  * Prototypes responsible for evrpc scheduling and hooking
michael@0:  */
michael@0: 
michael@0: static void evrpc_schedule_request_closure(void *ctx, enum EVRPC_HOOK_RESULT);
michael@0: 
michael@0: /*
michael@0:  * We assume that the ctx is no longer queued on the pool.
michael@0:  */
michael@0: static int
michael@0: evrpc_schedule_request(struct evhttp_connection *connection,
michael@0:     struct evrpc_request_wrapper *ctx)
michael@0: {
michael@0: 	struct evhttp_request *req = NULL;
michael@0: 	struct evrpc_pool *pool = ctx->pool;
michael@0: 	struct evrpc_status status;
michael@0: 
michael@0: 	if ((req = evhttp_request_new(evrpc_reply_done, ctx)) == NULL)
michael@0: 		goto error;
michael@0: 
michael@0: 	/* serialize the request data into the output buffer */
michael@0: 	ctx->request_marshal(req->output_buffer, ctx->request);
michael@0: 
michael@0: 	/* we need to know the connection that we might have to abort */
michael@0: 	ctx->evcon = connection;
michael@0: 
michael@0: 	/* if we get paused we also need to know the request */
michael@0: 	ctx->req = req;
michael@0: 
michael@0: 	if (TAILQ_FIRST(&pool->output_hooks) != NULL) {
michael@0: 		int hook_res;
michael@0: 
michael@0: 		evrpc_hook_associate_meta(&ctx->hook_meta, connection);
michael@0: 
michael@0: 		/* apply hooks to the outgoing request */
michael@0: 		hook_res = evrpc_process_hooks(&pool->output_hooks,
michael@0: 		    ctx, req, req->output_buffer);
michael@0: 
michael@0: 		switch (hook_res) {
michael@0: 		case EVRPC_TERMINATE:
michael@0: 			goto error;
michael@0: 		case EVRPC_PAUSE:
michael@0: 			/* we need to be explicitly resumed */
michael@0: 			if (evrpc_pause_request(pool, ctx,
michael@0: 				evrpc_schedule_request_closure) == -1)
michael@0: 				goto error;
michael@0: 			return (0);
michael@0: 		case EVRPC_CONTINUE:
michael@0: 			/* we can just continue */
michael@0: 			break;
michael@0: 		default:
michael@0: 			EVUTIL_ASSERT(hook_res == EVRPC_TERMINATE ||
michael@0: 			    hook_res == EVRPC_CONTINUE ||
michael@0: 			    hook_res == EVRPC_PAUSE);
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	evrpc_schedule_request_closure(ctx, EVRPC_CONTINUE);
michael@0: 	return (0);
michael@0: 
michael@0: error:
michael@0: 	memset(&status, 0, sizeof(status));
michael@0: 	status.error = EVRPC_STATUS_ERR_UNSTARTED;
michael@0: 	(*ctx->cb)(&status, ctx->request, ctx->reply, ctx->cb_arg);
michael@0: 	evrpc_request_wrapper_free(ctx);
michael@0: 	return (-1);
michael@0: }
michael@0: 
michael@0: static void
michael@0: evrpc_schedule_request_closure(void *arg, enum EVRPC_HOOK_RESULT hook_res)
michael@0: {
michael@0: 	struct evrpc_request_wrapper *ctx = arg;
michael@0: 	struct evhttp_connection *connection = ctx->evcon;
michael@0: 	struct evhttp_request *req = ctx->req;
michael@0: 	struct evrpc_pool *pool = ctx->pool;
michael@0: 	struct evrpc_status status;
michael@0: 	char *uri = NULL;
michael@0: 	int res = 0;
michael@0: 
michael@0: 	if (hook_res == EVRPC_TERMINATE)
michael@0: 		goto error;
michael@0: 
michael@0: 	uri = evrpc_construct_uri(ctx->name);
michael@0: 	if (uri == NULL)
michael@0: 		goto error;
michael@0: 
michael@0: 	if (pool->timeout > 0) {
michael@0: 		/*
michael@0: 		 * a timeout after which the whole rpc is going to be aborted.
michael@0: 		 */
michael@0: 		struct timeval tv;
michael@0: 		evutil_timerclear(&tv);
michael@0: 		tv.tv_sec = pool->timeout;
michael@0: 		evtimer_add(&ctx->ev_timeout, &tv);
michael@0: 	}
michael@0: 
michael@0: 	/* start the request over the connection */
michael@0: 	res = evhttp_make_request(connection, req, EVHTTP_REQ_POST, uri);
michael@0: 	mm_free(uri);
michael@0: 
michael@0: 	if (res == -1)
michael@0: 		goto error;
michael@0: 
michael@0: 	return;
michael@0: 
michael@0: error:
michael@0: 	memset(&status, 0, sizeof(status));
michael@0: 	status.error = EVRPC_STATUS_ERR_UNSTARTED;
michael@0: 	(*ctx->cb)(&status, ctx->request, ctx->reply, ctx->cb_arg);
michael@0: 	evrpc_request_wrapper_free(ctx);
michael@0: }
michael@0: 
michael@0: /* we just queue the paused request on the pool under the req object */
michael@0: static int
michael@0: evrpc_pause_request(void *vbase, void *ctx,
michael@0:     void (*cb)(void *, enum EVRPC_HOOK_RESULT))
michael@0: {
michael@0: 	struct _evrpc_hooks *base = vbase;
michael@0: 	struct evrpc_hook_ctx *pause = mm_malloc(sizeof(*pause));
michael@0: 	if (pause == NULL)
michael@0: 		return (-1);
michael@0: 
michael@0: 	pause->ctx = ctx;
michael@0: 	pause->cb = cb;
michael@0: 
michael@0: 	TAILQ_INSERT_TAIL(&base->pause_requests, pause, next);
michael@0: 	return (0);
michael@0: }
michael@0: 
michael@0: int
michael@0: evrpc_resume_request(void *vbase, void *ctx, enum EVRPC_HOOK_RESULT res)
michael@0: {
michael@0: 	struct _evrpc_hooks *base = vbase;
michael@0: 	struct evrpc_pause_list *head = &base->pause_requests;
michael@0: 	struct evrpc_hook_ctx *pause;
michael@0: 
michael@0: 	TAILQ_FOREACH(pause, head, next) {
michael@0: 		if (pause->ctx == ctx)
michael@0: 			break;
michael@0: 	}
michael@0: 
michael@0: 	if (pause == NULL)
michael@0: 		return (-1);
michael@0: 
michael@0: 	(*pause->cb)(pause->ctx, res);
michael@0: 	TAILQ_REMOVE(head, pause, next);
michael@0: 	mm_free(pause);
michael@0: 	return (0);
michael@0: }
michael@0: 
michael@0: int
michael@0: evrpc_make_request(struct evrpc_request_wrapper *ctx)
michael@0: {
michael@0: 	struct evrpc_pool *pool = ctx->pool;
michael@0: 
michael@0: 	/* initialize the event structure for this rpc */
michael@0: 	evtimer_assign(&ctx->ev_timeout, pool->base, evrpc_request_timeout, ctx);
michael@0: 
michael@0: 	/* we better have some available connections on the pool */
michael@0: 	EVUTIL_ASSERT(TAILQ_FIRST(&pool->connections) != NULL);
michael@0: 
michael@0: 	/*
michael@0: 	 * if no connection is available, we queue the request on the pool,
michael@0: 	 * the next time a connection is empty, the rpc will be send on that.
michael@0: 	 */
michael@0: 	TAILQ_INSERT_TAIL(&pool->requests, ctx, next);
michael@0: 
michael@0: 	evrpc_pool_schedule(pool);
michael@0: 
michael@0: 	return (0);
michael@0: }
michael@0: 
michael@0: 
michael@0: struct evrpc_request_wrapper *
michael@0: evrpc_make_request_ctx(
michael@0: 	struct evrpc_pool *pool, void *request, void *reply,
michael@0: 	const char *rpcname,
michael@0: 	void (*req_marshal)(struct evbuffer*, void *),
michael@0: 	void (*rpl_clear)(void *),
michael@0: 	int (*rpl_unmarshal)(void *, struct evbuffer *),
michael@0: 	void (*cb)(struct evrpc_status *, void *, void *, void *),
michael@0: 	void *cbarg)
michael@0: {
michael@0: 	struct evrpc_request_wrapper *ctx = (struct evrpc_request_wrapper *)
michael@0: 	    mm_malloc(sizeof(struct evrpc_request_wrapper));
michael@0: 	if (ctx == NULL)
michael@0: 		return (NULL);
michael@0: 
michael@0: 	ctx->pool = pool;
michael@0: 	ctx->hook_meta = NULL;
michael@0: 	ctx->evcon = NULL;
michael@0: 	ctx->name = mm_strdup(rpcname);
michael@0: 	if (ctx->name == NULL) {
michael@0: 		mm_free(ctx);
michael@0: 		return (NULL);
michael@0: 	}
michael@0: 	ctx->cb = cb;
michael@0: 	ctx->cb_arg = cbarg;
michael@0: 	ctx->request = request;
michael@0: 	ctx->reply = reply;
michael@0: 	ctx->request_marshal = req_marshal;
michael@0: 	ctx->reply_clear = rpl_clear;
michael@0: 	ctx->reply_unmarshal = rpl_unmarshal;
michael@0: 
michael@0: 	return (ctx);
michael@0: }
michael@0: 
michael@0: static void
michael@0: evrpc_reply_done_closure(void *, enum EVRPC_HOOK_RESULT);
michael@0: 
michael@0: static void
michael@0: evrpc_reply_done(struct evhttp_request *req, void *arg)
michael@0: {
michael@0: 	struct evrpc_request_wrapper *ctx = arg;
michael@0: 	struct evrpc_pool *pool = ctx->pool;
michael@0: 	int hook_res = EVRPC_CONTINUE;
michael@0: 
michael@0: 	/* cancel any timeout we might have scheduled */
michael@0: 	event_del(&ctx->ev_timeout);
michael@0: 
michael@0: 	ctx->req = req;
michael@0: 
michael@0: 	/* we need to get the reply now */
michael@0: 	if (req == NULL) {
michael@0: 		evrpc_reply_done_closure(ctx, EVRPC_CONTINUE);
michael@0: 		return;
michael@0: 	}
michael@0: 
michael@0: 	if (TAILQ_FIRST(&pool->input_hooks) != NULL) {
michael@0: 		evrpc_hook_associate_meta(&ctx->hook_meta, ctx->evcon);
michael@0: 
michael@0: 		/* apply hooks to the incoming request */
michael@0: 		hook_res = evrpc_process_hooks(&pool->input_hooks,
michael@0: 		    ctx, req, req->input_buffer);
michael@0: 
michael@0: 		switch (hook_res) {
michael@0: 		case EVRPC_TERMINATE:
michael@0: 		case EVRPC_CONTINUE:
michael@0: 			break;
michael@0: 		case EVRPC_PAUSE:
michael@0: 			/*
michael@0: 			 * if we get paused we also need to know the
michael@0: 			 * request.  unfortunately, the underlying
michael@0: 			 * layer is going to free it.  we need to
michael@0: 			 * request ownership explicitly
michael@0: 			 */
michael@0: 			if (req != NULL)
michael@0: 				evhttp_request_own(req);
michael@0: 
michael@0: 			evrpc_pause_request(pool, ctx,
michael@0: 			    evrpc_reply_done_closure);
michael@0: 			return;
michael@0: 		default:
michael@0: 			EVUTIL_ASSERT(hook_res == EVRPC_TERMINATE ||
michael@0: 			    hook_res == EVRPC_CONTINUE ||
michael@0: 			    hook_res == EVRPC_PAUSE);
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	evrpc_reply_done_closure(ctx, hook_res);
michael@0: 
michael@0: 	/* http request is being freed by underlying layer */
michael@0: }
michael@0: 
michael@0: static void
michael@0: evrpc_reply_done_closure(void *arg, enum EVRPC_HOOK_RESULT hook_res)
michael@0: {
michael@0: 	struct evrpc_request_wrapper *ctx = arg;
michael@0: 	struct evhttp_request *req = ctx->req;
michael@0: 	struct evrpc_pool *pool = ctx->pool;
michael@0: 	struct evrpc_status status;
michael@0: 	int res = -1;
michael@0: 
michael@0: 	memset(&status, 0, sizeof(status));
michael@0: 	status.http_req = req;
michael@0: 
michael@0: 	/* we need to get the reply now */
michael@0: 	if (req == NULL) {
michael@0: 		status.error = EVRPC_STATUS_ERR_TIMEOUT;
michael@0: 	} else if (hook_res == EVRPC_TERMINATE) {
michael@0: 		status.error = EVRPC_STATUS_ERR_HOOKABORTED;
michael@0: 	} else {
michael@0: 		res = ctx->reply_unmarshal(ctx->reply, req->input_buffer);
michael@0: 		if (res == -1)
michael@0: 			status.error = EVRPC_STATUS_ERR_BADPAYLOAD;
michael@0: 	}
michael@0: 
michael@0: 	if (res == -1) {
michael@0: 		/* clear everything that we might have written previously */
michael@0: 		ctx->reply_clear(ctx->reply);
michael@0: 	}
michael@0: 
michael@0: 	(*ctx->cb)(&status, ctx->request, ctx->reply, ctx->cb_arg);
michael@0: 
michael@0: 	evrpc_request_wrapper_free(ctx);
michael@0: 
michael@0: 	/* the http layer owned the original request structure, but if we
michael@0: 	 * got paused, we asked for ownership and need to free it here. */
michael@0: 	if (req != NULL && evhttp_request_is_owned(req))
michael@0: 		evhttp_request_free(req);
michael@0: 
michael@0: 	/* see if we can schedule another request */
michael@0: 	evrpc_pool_schedule(pool);
michael@0: }
michael@0: 
michael@0: static void
michael@0: evrpc_pool_schedule(struct evrpc_pool *pool)
michael@0: {
michael@0: 	struct evrpc_request_wrapper *ctx = TAILQ_FIRST(&pool->requests);
michael@0: 	struct evhttp_connection *evcon;
michael@0: 
michael@0: 	/* if no requests are pending, we have no work */
michael@0: 	if (ctx == NULL)
michael@0: 		return;
michael@0: 
michael@0: 	if ((evcon = evrpc_pool_find_connection(pool)) != NULL) {
michael@0: 		TAILQ_REMOVE(&pool->requests, ctx, next);
michael@0: 		evrpc_schedule_request(evcon, ctx);
michael@0: 	}
michael@0: }
michael@0: 
michael@0: static void
michael@0: evrpc_request_timeout(evutil_socket_t fd, short what, void *arg)
michael@0: {
michael@0: 	struct evrpc_request_wrapper *ctx = arg;
michael@0: 	struct evhttp_connection *evcon = ctx->evcon;
michael@0: 	EVUTIL_ASSERT(evcon != NULL);
michael@0: 
michael@0: 	evhttp_connection_fail(evcon, EVCON_HTTP_TIMEOUT);
michael@0: }
michael@0: 
michael@0: /*
michael@0:  * frees potential meta data associated with a request.
michael@0:  */
michael@0: 
michael@0: static void
michael@0: evrpc_meta_data_free(struct evrpc_meta_list *meta_data)
michael@0: {
michael@0: 	struct evrpc_meta *entry;
michael@0: 	EVUTIL_ASSERT(meta_data != NULL);
michael@0: 
michael@0: 	while ((entry = TAILQ_FIRST(meta_data)) != NULL) {
michael@0: 		TAILQ_REMOVE(meta_data, entry, next);
michael@0: 		mm_free(entry->key);
michael@0: 		mm_free(entry->data);
michael@0: 		mm_free(entry);
michael@0: 	}
michael@0: }
michael@0: 
michael@0: static struct evrpc_hook_meta *
michael@0: evrpc_hook_meta_new(void)
michael@0: {
michael@0: 	struct evrpc_hook_meta *ctx;
michael@0: 	ctx = mm_malloc(sizeof(struct evrpc_hook_meta));
michael@0: 	EVUTIL_ASSERT(ctx != NULL);
michael@0: 
michael@0: 	TAILQ_INIT(&ctx->meta_data);
michael@0: 	ctx->evcon = NULL;
michael@0: 
michael@0: 	return (ctx);
michael@0: }
michael@0: 
michael@0: static void
michael@0: evrpc_hook_associate_meta(struct evrpc_hook_meta **pctx,
michael@0:     struct evhttp_connection *evcon)
michael@0: {
michael@0: 	struct evrpc_hook_meta *ctx = *pctx;
michael@0: 	if (ctx == NULL)
michael@0: 		*pctx = ctx = evrpc_hook_meta_new();
michael@0: 	ctx->evcon = evcon;
michael@0: }
michael@0: 
michael@0: static void
michael@0: evrpc_hook_context_free(struct evrpc_hook_meta *ctx)
michael@0: {
michael@0: 	evrpc_meta_data_free(&ctx->meta_data);
michael@0: 	mm_free(ctx);
michael@0: }
michael@0: 
michael@0: /* Adds meta data */
michael@0: void
michael@0: evrpc_hook_add_meta(void *ctx, const char *key,
michael@0:     const void *data, size_t data_size)
michael@0: {
michael@0: 	struct evrpc_request_wrapper *req = ctx;
michael@0: 	struct evrpc_hook_meta *store = NULL;
michael@0: 	struct evrpc_meta *meta = NULL;
michael@0: 
michael@0: 	if ((store = req->hook_meta) == NULL)
michael@0: 		store = req->hook_meta = evrpc_hook_meta_new();
michael@0: 
michael@0: 	meta = mm_malloc(sizeof(struct evrpc_meta));
michael@0: 	EVUTIL_ASSERT(meta != NULL);
michael@0: 	meta->key = mm_strdup(key);
michael@0: 	EVUTIL_ASSERT(meta->key != NULL);
michael@0: 	meta->data_size = data_size;
michael@0: 	meta->data = mm_malloc(data_size);
michael@0: 	EVUTIL_ASSERT(meta->data != NULL);
michael@0: 	memcpy(meta->data, data, data_size);
michael@0: 
michael@0: 	TAILQ_INSERT_TAIL(&store->meta_data, meta, next);
michael@0: }
michael@0: 
michael@0: int
michael@0: evrpc_hook_find_meta(void *ctx, const char *key, void **data, size_t *data_size)
michael@0: {
michael@0: 	struct evrpc_request_wrapper *req = ctx;
michael@0: 	struct evrpc_meta *meta = NULL;
michael@0: 
michael@0: 	if (req->hook_meta == NULL)
michael@0: 		return (-1);
michael@0: 
michael@0: 	TAILQ_FOREACH(meta, &req->hook_meta->meta_data, next) {
michael@0: 		if (strcmp(meta->key, key) == 0) {
michael@0: 			*data = meta->data;
michael@0: 			*data_size = meta->data_size;
michael@0: 			return (0);
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	return (-1);
michael@0: }
michael@0: 
michael@0: struct evhttp_connection *
michael@0: evrpc_hook_get_connection(void *ctx)
michael@0: {
michael@0: 	struct evrpc_request_wrapper *req = ctx;
michael@0: 	return (req->hook_meta != NULL ? req->hook_meta->evcon : NULL);
michael@0: }
michael@0: 
michael@0: int
michael@0: evrpc_send_request_generic(struct evrpc_pool *pool,
michael@0:     void *request, void *reply,
michael@0:     void (*cb)(struct evrpc_status *, void *, void *, void *),
michael@0:     void *cb_arg,
michael@0:     const char *rpcname,
michael@0:     void (*req_marshal)(struct evbuffer *, void *),
michael@0:     void (*rpl_clear)(void *),
michael@0:     int (*rpl_unmarshal)(void *, struct evbuffer *))
michael@0: {
michael@0: 	struct evrpc_status status;
michael@0: 	struct evrpc_request_wrapper *ctx;
michael@0: 	ctx = evrpc_make_request_ctx(pool, request, reply,
michael@0: 	    rpcname, req_marshal, rpl_clear, rpl_unmarshal, cb, cb_arg);
michael@0: 	if (ctx == NULL)
michael@0: 		goto error;
michael@0: 	return (evrpc_make_request(ctx));
michael@0: error:
michael@0: 	memset(&status, 0, sizeof(status));
michael@0: 	status.error = EVRPC_STATUS_ERR_UNSTARTED;
michael@0: 	(*(cb))(&status, request, reply, cb_arg);
michael@0: 	return (-1);
michael@0: }
michael@0: 
michael@0: /** Takes a request object and fills it in with the right magic */
michael@0: static struct evrpc *
michael@0: evrpc_register_object(const char *name,
michael@0:     void *(*req_new)(void*), void *req_new_arg, void (*req_free)(void *),
michael@0:     int (*req_unmarshal)(void *, struct evbuffer *),
michael@0:     void *(*rpl_new)(void*), void *rpl_new_arg, void (*rpl_free)(void *),
michael@0:     int (*rpl_complete)(void *),
michael@0:     void (*rpl_marshal)(struct evbuffer *, void *))
michael@0: {
michael@0: 	struct evrpc* rpc = (struct evrpc *)mm_calloc(1, sizeof(struct evrpc));
michael@0: 	if (rpc == NULL)
michael@0: 		return (NULL);
michael@0: 	rpc->uri = mm_strdup(name);
michael@0: 	if (rpc->uri == NULL) {
michael@0: 		mm_free(rpc);
michael@0: 		return (NULL);
michael@0: 	}
michael@0: 	rpc->request_new = req_new;
michael@0: 	rpc->request_new_arg = req_new_arg;
michael@0: 	rpc->request_free = req_free;
michael@0: 	rpc->request_unmarshal = req_unmarshal;
michael@0: 	rpc->reply_new = rpl_new;
michael@0: 	rpc->reply_new_arg = rpl_new_arg;
michael@0: 	rpc->reply_free = rpl_free;
michael@0: 	rpc->reply_complete = rpl_complete;
michael@0: 	rpc->reply_marshal = rpl_marshal;
michael@0: 	return (rpc);
michael@0: }
michael@0: 
michael@0: int
michael@0: evrpc_register_generic(struct evrpc_base *base, const char *name,
michael@0:     void (*callback)(struct evrpc_req_generic *, void *), void *cbarg,
michael@0:     void *(*req_new)(void *), void *req_new_arg, void (*req_free)(void *),
michael@0:     int (*req_unmarshal)(void *, struct evbuffer *),
michael@0:     void *(*rpl_new)(void *), void *rpl_new_arg, void (*rpl_free)(void *),
michael@0:     int (*rpl_complete)(void *),
michael@0:     void (*rpl_marshal)(struct evbuffer *, void *))
michael@0: {
michael@0: 	struct evrpc* rpc =
michael@0: 	    evrpc_register_object(name, req_new, req_new_arg, req_free, req_unmarshal,
michael@0: 		rpl_new, rpl_new_arg, rpl_free, rpl_complete, rpl_marshal);
michael@0: 	if (rpc == NULL)
michael@0: 		return (-1);
michael@0: 	evrpc_register_rpc(base, rpc,
michael@0: 	    (void (*)(struct evrpc_req_generic*, void *))callback, cbarg);
michael@0: 	return (0);
michael@0: }
michael@0: 
michael@0: /** accessors for obscure and undocumented functionality */
michael@0: struct evrpc_pool *
michael@0: evrpc_request_get_pool(struct evrpc_request_wrapper *ctx)
michael@0: {
michael@0: 	return (ctx->pool);
michael@0: }
michael@0: 
michael@0: void
michael@0: evrpc_request_set_pool(struct evrpc_request_wrapper *ctx,
michael@0:     struct evrpc_pool *pool)
michael@0: {
michael@0: 	ctx->pool = pool;
michael@0: }
michael@0: 
michael@0: void
michael@0: evrpc_request_set_cb(struct evrpc_request_wrapper *ctx,
michael@0:     void (*cb)(struct evrpc_status*, void *request, void *reply, void *arg),
michael@0:     void *cb_arg)
michael@0: {
michael@0: 	ctx->cb = cb;
michael@0: 	ctx->cb_arg = cb_arg;
michael@0: }