+++ /dev/null
-/*
- * Copyright (c) 2000-2007 Niels Provos <provos@citi.umich.edu>
- * Copyright (c) 2007-2010 Niels Provos and Nick Mathewson
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#include "event2/event-config.h"
-
-#ifdef WIN32
-#define WIN32_LEAN_AND_MEAN
-#include <winsock2.h>
-#include <windows.h>
-#undef WIN32_LEAN_AND_MEAN
-#endif
-
-#include <sys/types.h>
-#ifndef WIN32
-#include <sys/socket.h>
-#endif
-#ifdef _EVENT_HAVE_SYS_TIME_H
-#include <sys/time.h>
-#endif
-#include <sys/queue.h>
-#include <stdio.h>
-#include <stdlib.h>
-#ifndef WIN32
-#include <unistd.h>
-#endif
-#include <errno.h>
-#include <signal.h>
-#include <string.h>
-
-#include <sys/queue.h>
-
-#include "event2/event.h"
-#include "event2/event_struct.h"
-#include "event2/rpc.h"
-#include "event2/rpc_struct.h"
-#include "evrpc-internal.h"
-#include "event2/http.h"
-#include "event2/buffer.h"
-#include "event2/tag.h"
-#include "event2/http_struct.h"
-#include "event2/http_compat.h"
-#include "event2/util.h"
-#include "util-internal.h"
-#include "log-internal.h"
-#include "mm-internal.h"
-
-struct evrpc_base *
-evrpc_init(struct evhttp *http_server)
-{
- struct evrpc_base* base = mm_calloc(1, sizeof(struct evrpc_base));
- if (base == NULL)
- return (NULL);
-
- /* we rely on the tagging sub system */
- evtag_init();
-
- TAILQ_INIT(&base->registered_rpcs);
- TAILQ_INIT(&base->input_hooks);
- TAILQ_INIT(&base->output_hooks);
-
- TAILQ_INIT(&base->paused_requests);
-
- base->http_server = http_server;
-
- return (base);
-}
-
-void
-evrpc_free(struct evrpc_base *base)
-{
- struct evrpc *rpc;
- struct evrpc_hook *hook;
- struct evrpc_hook_ctx *pause;
- int r;
-
- while ((rpc = TAILQ_FIRST(&base->registered_rpcs)) != NULL) {
- r = evrpc_unregister_rpc(base, rpc->uri);
- EVUTIL_ASSERT(r == 0);
- }
- while ((pause = TAILQ_FIRST(&base->paused_requests)) != NULL) {
- TAILQ_REMOVE(&base->paused_requests, pause, next);
- mm_free(pause);
- }
- while ((hook = TAILQ_FIRST(&base->input_hooks)) != NULL) {
- r = evrpc_remove_hook(base, EVRPC_INPUT, hook);
- EVUTIL_ASSERT(r);
- }
- while ((hook = TAILQ_FIRST(&base->output_hooks)) != NULL) {
- r = evrpc_remove_hook(base, EVRPC_OUTPUT, hook);
- EVUTIL_ASSERT(r);
- }
- mm_free(base);
-}
-
-void *
-evrpc_add_hook(void *vbase,
- enum EVRPC_HOOK_TYPE hook_type,
- int (*cb)(void *, struct evhttp_request *, struct evbuffer *, void *),
- void *cb_arg)
-{
- struct _evrpc_hooks *base = vbase;
- struct evrpc_hook_list *head = NULL;
- struct evrpc_hook *hook = NULL;
- switch (hook_type) {
- case EVRPC_INPUT:
- head = &base->in_hooks;
- break;
- case EVRPC_OUTPUT:
- head = &base->out_hooks;
- break;
- default:
- EVUTIL_ASSERT(hook_type == EVRPC_INPUT || hook_type == EVRPC_OUTPUT);
- }
-
- hook = mm_calloc(1, sizeof(struct evrpc_hook));
- EVUTIL_ASSERT(hook != NULL);
-
- hook->process = cb;
- hook->process_arg = cb_arg;
- TAILQ_INSERT_TAIL(head, hook, next);
-
- return (hook);
-}
-
-static int
-evrpc_remove_hook_internal(struct evrpc_hook_list *head, void *handle)
-{
- struct evrpc_hook *hook = NULL;
- TAILQ_FOREACH(hook, head, next) {
- if (hook == handle) {
- TAILQ_REMOVE(head, hook, next);
- mm_free(hook);
- return (1);
- }
- }
-
- return (0);
-}
-
-/*
- * remove the hook specified by the handle
- */
-
-int
-evrpc_remove_hook(void *vbase, enum EVRPC_HOOK_TYPE hook_type, void *handle)
-{
- struct _evrpc_hooks *base = vbase;
- struct evrpc_hook_list *head = NULL;
- switch (hook_type) {
- case EVRPC_INPUT:
- head = &base->in_hooks;
- break;
- case EVRPC_OUTPUT:
- head = &base->out_hooks;
- break;
- default:
- EVUTIL_ASSERT(hook_type == EVRPC_INPUT || hook_type == EVRPC_OUTPUT);
- }
-
- return (evrpc_remove_hook_internal(head, handle));
-}
-
-static int
-evrpc_process_hooks(struct evrpc_hook_list *head, void *ctx,
- struct evhttp_request *req, struct evbuffer *evbuf)
-{
- struct evrpc_hook *hook;
- TAILQ_FOREACH(hook, head, next) {
- int res = hook->process(ctx, req, evbuf, hook->process_arg);
- if (res != EVRPC_CONTINUE)
- return (res);
- }
-
- return (EVRPC_CONTINUE);
-}
-
-static void evrpc_pool_schedule(struct evrpc_pool *pool);
-static void evrpc_request_cb(struct evhttp_request *, void *);
-
-/*
- * Registers a new RPC with the HTTP server. The evrpc object is expected
- * to have been filled in via the EVRPC_REGISTER_OBJECT macro which in turn
- * calls this function.
- */
-
-static char *
-evrpc_construct_uri(const char *uri)
-{
- char *constructed_uri;
- size_t constructed_uri_len;
-
- constructed_uri_len = strlen(EVRPC_URI_PREFIX) + strlen(uri) + 1;
- if ((constructed_uri = mm_malloc(constructed_uri_len)) == NULL)
- event_err(1, "%s: failed to register rpc at %s",
- __func__, uri);
- memcpy(constructed_uri, EVRPC_URI_PREFIX, strlen(EVRPC_URI_PREFIX));
- memcpy(constructed_uri + strlen(EVRPC_URI_PREFIX), uri, strlen(uri));
- constructed_uri[constructed_uri_len - 1] = '\0';
-
- return (constructed_uri);
-}
-
-int
-evrpc_register_rpc(struct evrpc_base *base, struct evrpc *rpc,
- void (*cb)(struct evrpc_req_generic *, void *), void *cb_arg)
-{
- char *constructed_uri = evrpc_construct_uri(rpc->uri);
-
- rpc->base = base;
- rpc->cb = cb;
- rpc->cb_arg = cb_arg;
-
- TAILQ_INSERT_TAIL(&base->registered_rpcs, rpc, next);
-
- evhttp_set_cb(base->http_server,
- constructed_uri,
- evrpc_request_cb,
- rpc);
-
- mm_free(constructed_uri);
-
- return (0);
-}
-
-int
-evrpc_unregister_rpc(struct evrpc_base *base, const char *name)
-{
- char *registered_uri = NULL;
- struct evrpc *rpc;
- int r;
-
- /* find the right rpc; linear search might be slow */
- TAILQ_FOREACH(rpc, &base->registered_rpcs, next) {
- if (strcmp(rpc->uri, name) == 0)
- break;
- }
- if (rpc == NULL) {
- /* We did not find an RPC with this name */
- return (-1);
- }
- TAILQ_REMOVE(&base->registered_rpcs, rpc, next);
-
- registered_uri = evrpc_construct_uri(name);
-
- /* remove the http server callback */
- r = evhttp_del_cb(base->http_server, registered_uri);
- EVUTIL_ASSERT(r == 0);
-
- mm_free(registered_uri);
-
- mm_free((char *)rpc->uri);
- mm_free(rpc);
- return (0);
-}
-
-static int evrpc_pause_request(void *vbase, void *ctx,
- void (*cb)(void *, enum EVRPC_HOOK_RESULT));
-static void evrpc_request_cb_closure(void *, enum EVRPC_HOOK_RESULT);
-
-static void
-evrpc_request_cb(struct evhttp_request *req, void *arg)
-{
- struct evrpc *rpc = arg;
- struct evrpc_req_generic *rpc_state = NULL;
-
- /* let's verify the outside parameters */
- if (req->type != EVHTTP_REQ_POST ||
- evbuffer_get_length(req->input_buffer) <= 0)
- goto error;
-
- rpc_state = mm_calloc(1, sizeof(struct evrpc_req_generic));
- if (rpc_state == NULL)
- goto error;
- rpc_state->rpc = rpc;
- rpc_state->http_req = req;
- rpc_state->rpc_data = NULL;
-
- if (TAILQ_FIRST(&rpc->base->input_hooks) != NULL) {
- int hook_res;
-
- evrpc_hook_associate_meta(&rpc_state->hook_meta, req->evcon);
-
- /*
- * allow hooks to modify the outgoing request
- */
- hook_res = evrpc_process_hooks(&rpc->base->input_hooks,
- rpc_state, req, req->input_buffer);
- switch (hook_res) {
- case EVRPC_TERMINATE:
- goto error;
- case EVRPC_PAUSE:
- evrpc_pause_request(rpc->base, rpc_state,
- evrpc_request_cb_closure);
- return;
- case EVRPC_CONTINUE:
- break;
- default:
- EVUTIL_ASSERT(hook_res == EVRPC_TERMINATE ||
- hook_res == EVRPC_CONTINUE ||
- hook_res == EVRPC_PAUSE);
- }
- }
-
- evrpc_request_cb_closure(rpc_state, EVRPC_CONTINUE);
- return;
-
-error:
- if (rpc_state != NULL)
- evrpc_reqstate_free(rpc_state);
- evhttp_send_error(req, HTTP_SERVUNAVAIL, NULL);
- return;
-}
-
-static void
-evrpc_request_cb_closure(void *arg, enum EVRPC_HOOK_RESULT hook_res)
-{
- struct evrpc_req_generic *rpc_state = arg;
- struct evrpc *rpc = rpc_state->rpc;
- struct evhttp_request *req = rpc_state->http_req;
-
- if (hook_res == EVRPC_TERMINATE)
- goto error;
-
- /* let's check that we can parse the request */
- rpc_state->request = rpc->request_new(rpc->request_new_arg);
- if (rpc_state->request == NULL)
- goto error;
-
- if (rpc->request_unmarshal(
- rpc_state->request, req->input_buffer) == -1) {
- /* we failed to parse the request; that's a bummer */
- goto error;
- }
-
- /* at this point, we have a well formed request, prepare the reply */
-
- rpc_state->reply = rpc->reply_new(rpc->reply_new_arg);
- if (rpc_state->reply == NULL)
- goto error;
-
- /* give the rpc to the user; they can deal with it */
- rpc->cb(rpc_state, rpc->cb_arg);
-
- return;
-
-error:
- if (rpc_state != NULL)
- evrpc_reqstate_free(rpc_state);
- evhttp_send_error(req, HTTP_SERVUNAVAIL, NULL);
- return;
-}
-
-
-void
-evrpc_reqstate_free(struct evrpc_req_generic* rpc_state)
-{
- struct evrpc *rpc;
- EVUTIL_ASSERT(rpc_state != NULL);
- rpc = rpc_state->rpc;
-
- /* clean up all memory */
- if (rpc_state->hook_meta != NULL)
- evrpc_hook_context_free(rpc_state->hook_meta);
- if (rpc_state->request != NULL)
- rpc->request_free(rpc_state->request);
- if (rpc_state->reply != NULL)
- rpc->reply_free(rpc_state->reply);
- if (rpc_state->rpc_data != NULL)
- evbuffer_free(rpc_state->rpc_data);
- mm_free(rpc_state);
-}
-
-static void
-evrpc_request_done_closure(void *, enum EVRPC_HOOK_RESULT);
-
-void
-evrpc_request_done(struct evrpc_req_generic *rpc_state)
-{
- struct evhttp_request *req = rpc_state->http_req;
- struct evrpc *rpc = rpc_state->rpc;
-
- if (rpc->reply_complete(rpc_state->reply) == -1) {
- /* the reply was not completely filled in. error out */
- goto error;
- }
-
- if ((rpc_state->rpc_data = evbuffer_new()) == NULL) {
- /* out of memory */
- goto error;
- }
-
- /* serialize the reply */
- rpc->reply_marshal(rpc_state->rpc_data, rpc_state->reply);
-
- if (TAILQ_FIRST(&rpc->base->output_hooks) != NULL) {
- int hook_res;
-
- evrpc_hook_associate_meta(&rpc_state->hook_meta, req->evcon);
-
- /* do hook based tweaks to the request */
- hook_res = evrpc_process_hooks(&rpc->base->output_hooks,
- rpc_state, req, rpc_state->rpc_data);
- switch (hook_res) {
- case EVRPC_TERMINATE:
- goto error;
- case EVRPC_PAUSE:
- if (evrpc_pause_request(rpc->base, rpc_state,
- evrpc_request_done_closure) == -1)
- goto error;
- return;
- case EVRPC_CONTINUE:
- break;
- default:
- EVUTIL_ASSERT(hook_res == EVRPC_TERMINATE ||
- hook_res == EVRPC_CONTINUE ||
- hook_res == EVRPC_PAUSE);
- }
- }
-
- evrpc_request_done_closure(rpc_state, EVRPC_CONTINUE);
- return;
-
-error:
- if (rpc_state != NULL)
- evrpc_reqstate_free(rpc_state);
- evhttp_send_error(req, HTTP_SERVUNAVAIL, NULL);
- return;
-}
-
-void *
-evrpc_get_request(struct evrpc_req_generic *req)
-{
- return req->request;
-}
-
-void *
-evrpc_get_reply(struct evrpc_req_generic *req)
-{
- return req->reply;
-}
-
-static void
-evrpc_request_done_closure(void *arg, enum EVRPC_HOOK_RESULT hook_res)
-{
- struct evrpc_req_generic *rpc_state = arg;
- struct evhttp_request *req = rpc_state->http_req;
-
- if (hook_res == EVRPC_TERMINATE)
- goto error;
-
- /* on success, we are going to transmit marshaled binary data */
- if (evhttp_find_header(req->output_headers, "Content-Type") == NULL) {
- evhttp_add_header(req->output_headers,
- "Content-Type", "application/octet-stream");
- }
- evhttp_send_reply(req, HTTP_OK, "OK", rpc_state->rpc_data);
-
- evrpc_reqstate_free(rpc_state);
-
- return;
-
-error:
- if (rpc_state != NULL)
- evrpc_reqstate_free(rpc_state);
- evhttp_send_error(req, HTTP_SERVUNAVAIL, NULL);
- return;
-}
-
-
-/* Client implementation of RPC site */
-
-static int evrpc_schedule_request(struct evhttp_connection *connection,
- struct evrpc_request_wrapper *ctx);
-
-struct evrpc_pool *
-evrpc_pool_new(struct event_base *base)
-{
- struct evrpc_pool *pool = mm_calloc(1, sizeof(struct evrpc_pool));
- if (pool == NULL)
- return (NULL);
-
- TAILQ_INIT(&pool->connections);
- TAILQ_INIT(&pool->requests);
-
- TAILQ_INIT(&pool->paused_requests);
-
- TAILQ_INIT(&pool->input_hooks);
- TAILQ_INIT(&pool->output_hooks);
-
- pool->base = base;
- pool->timeout = -1;
-
- return (pool);
-}
-
-static void
-evrpc_request_wrapper_free(struct evrpc_request_wrapper *request)
-{
- if (request->hook_meta != NULL)
- evrpc_hook_context_free(request->hook_meta);
- mm_free(request->name);
- mm_free(request);
-}
-
-void
-evrpc_pool_free(struct evrpc_pool *pool)
-{
- struct evhttp_connection *connection;
- struct evrpc_request_wrapper *request;
- struct evrpc_hook_ctx *pause;
- struct evrpc_hook *hook;
- int r;
-
- while ((request = TAILQ_FIRST(&pool->requests)) != NULL) {
- TAILQ_REMOVE(&pool->requests, request, next);
- evrpc_request_wrapper_free(request);
- }
-
- while ((pause = TAILQ_FIRST(&pool->paused_requests)) != NULL) {
- TAILQ_REMOVE(&pool->paused_requests, pause, next);
- mm_free(pause);
- }
-
- while ((connection = TAILQ_FIRST(&pool->connections)) != NULL) {
- TAILQ_REMOVE(&pool->connections, connection, next);
- evhttp_connection_free(connection);
- }
-
- while ((hook = TAILQ_FIRST(&pool->input_hooks)) != NULL) {
- r = evrpc_remove_hook(pool, EVRPC_INPUT, hook);
- EVUTIL_ASSERT(r);
- }
-
- while ((hook = TAILQ_FIRST(&pool->output_hooks)) != NULL) {
- r = evrpc_remove_hook(pool, EVRPC_OUTPUT, hook);
- EVUTIL_ASSERT(r);
- }
-
- mm_free(pool);
-}
-
-/*
- * Add a connection to the RPC pool. A request scheduled on the pool
- * may use any available connection.
- */
-
-void
-evrpc_pool_add_connection(struct evrpc_pool *pool,
- struct evhttp_connection *connection)
-{
- EVUTIL_ASSERT(connection->http_server == NULL);
- TAILQ_INSERT_TAIL(&pool->connections, connection, next);
-
- /*
- * associate an event base with this connection
- */
- if (pool->base != NULL)
- evhttp_connection_set_base(connection, pool->base);
-
- /*
- * unless a timeout was specifically set for a connection,
- * the connection inherits the timeout from the pool.
- */
- if (connection->timeout == -1)
- connection->timeout = pool->timeout;
-
- /*
- * if we have any requests pending, schedule them with the new
- * connections.
- */
-
- if (TAILQ_FIRST(&pool->requests) != NULL) {
- struct evrpc_request_wrapper *request =
- TAILQ_FIRST(&pool->requests);
- TAILQ_REMOVE(&pool->requests, request, next);
- evrpc_schedule_request(connection, request);
- }
-}
-
-void
-evrpc_pool_remove_connection(struct evrpc_pool *pool,
- struct evhttp_connection *connection)
-{
- TAILQ_REMOVE(&pool->connections, connection, next);
-}
-
-void
-evrpc_pool_set_timeout(struct evrpc_pool *pool, int timeout_in_secs)
-{
- struct evhttp_connection *evcon;
- TAILQ_FOREACH(evcon, &pool->connections, next) {
- evcon->timeout = timeout_in_secs;
- }
- pool->timeout = timeout_in_secs;
-}
-
-
-static void evrpc_reply_done(struct evhttp_request *, void *);
-static void evrpc_request_timeout(evutil_socket_t, short, void *);
-
-/*
- * Finds a connection object associated with the pool that is currently
- * idle and can be used to make a request.
- */
-static struct evhttp_connection *
-evrpc_pool_find_connection(struct evrpc_pool *pool)
-{
- struct evhttp_connection *connection;
- TAILQ_FOREACH(connection, &pool->connections, next) {
- if (TAILQ_FIRST(&connection->requests) == NULL)
- return (connection);
- }
-
- return (NULL);
-}
-
-/*
- * Prototypes responsible for evrpc scheduling and hooking
- */
-
-static void evrpc_schedule_request_closure(void *ctx, enum EVRPC_HOOK_RESULT);
-
-/*
- * We assume that the ctx is no longer queued on the pool.
- */
-static int
-evrpc_schedule_request(struct evhttp_connection *connection,
- struct evrpc_request_wrapper *ctx)
-{
- struct evhttp_request *req = NULL;
- struct evrpc_pool *pool = ctx->pool;
- struct evrpc_status status;
-
- if ((req = evhttp_request_new(evrpc_reply_done, ctx)) == NULL)
- goto error;
-
- /* serialize the request data into the output buffer */
- ctx->request_marshal(req->output_buffer, ctx->request);
-
- /* we need to know the connection that we might have to abort */
- ctx->evcon = connection;
-
- /* if we get paused we also need to know the request */
- ctx->req = req;
-
- if (TAILQ_FIRST(&pool->output_hooks) != NULL) {
- int hook_res;
-
- evrpc_hook_associate_meta(&ctx->hook_meta, connection);
-
- /* apply hooks to the outgoing request */
- hook_res = evrpc_process_hooks(&pool->output_hooks,
- ctx, req, req->output_buffer);
-
- switch (hook_res) {
- case EVRPC_TERMINATE:
- goto error;
- case EVRPC_PAUSE:
- /* we need to be explicitly resumed */
- if (evrpc_pause_request(pool, ctx,
- evrpc_schedule_request_closure) == -1)
- goto error;
- return (0);
- case EVRPC_CONTINUE:
- /* we can just continue */
- break;
- default:
- EVUTIL_ASSERT(hook_res == EVRPC_TERMINATE ||
- hook_res == EVRPC_CONTINUE ||
- hook_res == EVRPC_PAUSE);
- }
- }
-
- evrpc_schedule_request_closure(ctx, EVRPC_CONTINUE);
- return (0);
-
-error:
- memset(&status, 0, sizeof(status));
- status.error = EVRPC_STATUS_ERR_UNSTARTED;
- (*ctx->cb)(&status, ctx->request, ctx->reply, ctx->cb_arg);
- evrpc_request_wrapper_free(ctx);
- return (-1);
-}
-
-static void
-evrpc_schedule_request_closure(void *arg, enum EVRPC_HOOK_RESULT hook_res)
-{
- struct evrpc_request_wrapper *ctx = arg;
- struct evhttp_connection *connection = ctx->evcon;
- struct evhttp_request *req = ctx->req;
- struct evrpc_pool *pool = ctx->pool;
- struct evrpc_status status;
- char *uri = NULL;
- int res = 0;
-
- if (hook_res == EVRPC_TERMINATE)
- goto error;
-
- uri = evrpc_construct_uri(ctx->name);
- if (uri == NULL)
- goto error;
-
- if (pool->timeout > 0) {
- /*
- * a timeout after which the whole rpc is going to be aborted.
- */
- struct timeval tv;
- evutil_timerclear(&tv);
- tv.tv_sec = pool->timeout;
- evtimer_add(&ctx->ev_timeout, &tv);
- }
-
- /* start the request over the connection */
- res = evhttp_make_request(connection, req, EVHTTP_REQ_POST, uri);
- mm_free(uri);
-
- if (res == -1)
- goto error;
-
- return;
-
-error:
- memset(&status, 0, sizeof(status));
- status.error = EVRPC_STATUS_ERR_UNSTARTED;
- (*ctx->cb)(&status, ctx->request, ctx->reply, ctx->cb_arg);
- evrpc_request_wrapper_free(ctx);
-}
-
-/* we just queue the paused request on the pool under the req object */
-static int
-evrpc_pause_request(void *vbase, void *ctx,
- void (*cb)(void *, enum EVRPC_HOOK_RESULT))
-{
- struct _evrpc_hooks *base = vbase;
- struct evrpc_hook_ctx *pause = mm_malloc(sizeof(*pause));
- if (pause == NULL)
- return (-1);
-
- pause->ctx = ctx;
- pause->cb = cb;
-
- TAILQ_INSERT_TAIL(&base->pause_requests, pause, next);
- return (0);
-}
-
-int
-evrpc_resume_request(void *vbase, void *ctx, enum EVRPC_HOOK_RESULT res)
-{
- struct _evrpc_hooks *base = vbase;
- struct evrpc_pause_list *head = &base->pause_requests;
- struct evrpc_hook_ctx *pause;
-
- TAILQ_FOREACH(pause, head, next) {
- if (pause->ctx == ctx)
- break;
- }
-
- if (pause == NULL)
- return (-1);
-
- (*pause->cb)(pause->ctx, res);
- TAILQ_REMOVE(head, pause, next);
- mm_free(pause);
- return (0);
-}
-
-int
-evrpc_make_request(struct evrpc_request_wrapper *ctx)
-{
- struct evrpc_pool *pool = ctx->pool;
-
- /* initialize the event structure for this rpc */
- evtimer_assign(&ctx->ev_timeout, pool->base, evrpc_request_timeout, ctx);
-
- /* we better have some available connections on the pool */
- EVUTIL_ASSERT(TAILQ_FIRST(&pool->connections) != NULL);
-
- /*
- * if no connection is available, we queue the request on the pool,
- * the next time a connection is empty, the rpc will be send on that.
- */
- TAILQ_INSERT_TAIL(&pool->requests, ctx, next);
-
- evrpc_pool_schedule(pool);
-
- return (0);
-}
-
-
-struct evrpc_request_wrapper *
-evrpc_make_request_ctx(
- struct evrpc_pool *pool, void *request, void *reply,
- const char *rpcname,
- void (*req_marshal)(struct evbuffer*, void *),
- void (*rpl_clear)(void *),
- int (*rpl_unmarshal)(void *, struct evbuffer *),
- void (*cb)(struct evrpc_status *, void *, void *, void *),
- void *cbarg)
-{
- struct evrpc_request_wrapper *ctx = (struct evrpc_request_wrapper *)
- mm_malloc(sizeof(struct evrpc_request_wrapper));
- if (ctx == NULL)
- return (NULL);
-
- ctx->pool = pool;
- ctx->hook_meta = NULL;
- ctx->evcon = NULL;
- ctx->name = mm_strdup(rpcname);
- if (ctx->name == NULL) {
- mm_free(ctx);
- return (NULL);
- }
- ctx->cb = cb;
- ctx->cb_arg = cbarg;
- ctx->request = request;
- ctx->reply = reply;
- ctx->request_marshal = req_marshal;
- ctx->reply_clear = rpl_clear;
- ctx->reply_unmarshal = rpl_unmarshal;
-
- return (ctx);
-}
-
-static void
-evrpc_reply_done_closure(void *, enum EVRPC_HOOK_RESULT);
-
-static void
-evrpc_reply_done(struct evhttp_request *req, void *arg)
-{
- struct evrpc_request_wrapper *ctx = arg;
- struct evrpc_pool *pool = ctx->pool;
- int hook_res = EVRPC_CONTINUE;
-
- /* cancel any timeout we might have scheduled */
- event_del(&ctx->ev_timeout);
-
- ctx->req = req;
-
- /* we need to get the reply now */
- if (req == NULL) {
- evrpc_reply_done_closure(ctx, EVRPC_CONTINUE);
- return;
- }
-
- if (TAILQ_FIRST(&pool->input_hooks) != NULL) {
- evrpc_hook_associate_meta(&ctx->hook_meta, ctx->evcon);
-
- /* apply hooks to the incoming request */
- hook_res = evrpc_process_hooks(&pool->input_hooks,
- ctx, req, req->input_buffer);
-
- switch (hook_res) {
- case EVRPC_TERMINATE:
- case EVRPC_CONTINUE:
- break;
- case EVRPC_PAUSE:
- /*
- * if we get paused we also need to know the
- * request. unfortunately, the underlying
- * layer is going to free it. we need to
- * request ownership explicitly
- */
- if (req != NULL)
- evhttp_request_own(req);
-
- evrpc_pause_request(pool, ctx,
- evrpc_reply_done_closure);
- return;
- default:
- EVUTIL_ASSERT(hook_res == EVRPC_TERMINATE ||
- hook_res == EVRPC_CONTINUE ||
- hook_res == EVRPC_PAUSE);
- }
- }
-
- evrpc_reply_done_closure(ctx, hook_res);
-
- /* http request is being freed by underlying layer */
-}
-
-static void
-evrpc_reply_done_closure(void *arg, enum EVRPC_HOOK_RESULT hook_res)
-{
- struct evrpc_request_wrapper *ctx = arg;
- struct evhttp_request *req = ctx->req;
- struct evrpc_pool *pool = ctx->pool;
- struct evrpc_status status;
- int res = -1;
-
- memset(&status, 0, sizeof(status));
- status.http_req = req;
-
- /* we need to get the reply now */
- if (req == NULL) {
- status.error = EVRPC_STATUS_ERR_TIMEOUT;
- } else if (hook_res == EVRPC_TERMINATE) {
- status.error = EVRPC_STATUS_ERR_HOOKABORTED;
- } else {
- res = ctx->reply_unmarshal(ctx->reply, req->input_buffer);
- if (res == -1)
- status.error = EVRPC_STATUS_ERR_BADPAYLOAD;
- }
-
- if (res == -1) {
- /* clear everything that we might have written previously */
- ctx->reply_clear(ctx->reply);
- }
-
- (*ctx->cb)(&status, ctx->request, ctx->reply, ctx->cb_arg);
-
- evrpc_request_wrapper_free(ctx);
-
- /* the http layer owned the original request structure, but if we
- * got paused, we asked for ownership and need to free it here. */
- if (req != NULL && evhttp_request_is_owned(req))
- evhttp_request_free(req);
-
- /* see if we can schedule another request */
- evrpc_pool_schedule(pool);
-}
-
-static void
-evrpc_pool_schedule(struct evrpc_pool *pool)
-{
- struct evrpc_request_wrapper *ctx = TAILQ_FIRST(&pool->requests);
- struct evhttp_connection *evcon;
-
- /* if no requests are pending, we have no work */
- if (ctx == NULL)
- return;
-
- if ((evcon = evrpc_pool_find_connection(pool)) != NULL) {
- TAILQ_REMOVE(&pool->requests, ctx, next);
- evrpc_schedule_request(evcon, ctx);
- }
-}
-
-static void
-evrpc_request_timeout(evutil_socket_t fd, short what, void *arg)
-{
- struct evrpc_request_wrapper *ctx = arg;
- struct evhttp_connection *evcon = ctx->evcon;
- EVUTIL_ASSERT(evcon != NULL);
-
- evhttp_connection_fail(evcon, EVCON_HTTP_TIMEOUT);
-}
-
-/*
- * frees potential meta data associated with a request.
- */
-
-static void
-evrpc_meta_data_free(struct evrpc_meta_list *meta_data)
-{
- struct evrpc_meta *entry;
- EVUTIL_ASSERT(meta_data != NULL);
-
- while ((entry = TAILQ_FIRST(meta_data)) != NULL) {
- TAILQ_REMOVE(meta_data, entry, next);
- mm_free(entry->key);
- mm_free(entry->data);
- mm_free(entry);
- }
-}
-
-static struct evrpc_hook_meta *
-evrpc_hook_meta_new(void)
-{
- struct evrpc_hook_meta *ctx;
- ctx = mm_malloc(sizeof(struct evrpc_hook_meta));
- EVUTIL_ASSERT(ctx != NULL);
-
- TAILQ_INIT(&ctx->meta_data);
- ctx->evcon = NULL;
-
- return (ctx);
-}
-
-static void
-evrpc_hook_associate_meta(struct evrpc_hook_meta **pctx,
- struct evhttp_connection *evcon)
-{
- struct evrpc_hook_meta *ctx = *pctx;
- if (ctx == NULL)
- *pctx = ctx = evrpc_hook_meta_new();
- ctx->evcon = evcon;
-}
-
-static void
-evrpc_hook_context_free(struct evrpc_hook_meta *ctx)
-{
- evrpc_meta_data_free(&ctx->meta_data);
- mm_free(ctx);
-}
-
-/* Adds meta data */
-void
-evrpc_hook_add_meta(void *ctx, const char *key,
- const void *data, size_t data_size)
-{
- struct evrpc_request_wrapper *req = ctx;
- struct evrpc_hook_meta *store = NULL;
- struct evrpc_meta *meta = NULL;
-
- if ((store = req->hook_meta) == NULL)
- store = req->hook_meta = evrpc_hook_meta_new();
-
- meta = mm_malloc(sizeof(struct evrpc_meta));
- EVUTIL_ASSERT(meta != NULL);
- meta->key = mm_strdup(key);
- EVUTIL_ASSERT(meta->key != NULL);
- meta->data_size = data_size;
- meta->data = mm_malloc(data_size);
- EVUTIL_ASSERT(meta->data != NULL);
- memcpy(meta->data, data, data_size);
-
- TAILQ_INSERT_TAIL(&store->meta_data, meta, next);
-}
-
-int
-evrpc_hook_find_meta(void *ctx, const char *key, void **data, size_t *data_size)
-{
- struct evrpc_request_wrapper *req = ctx;
- struct evrpc_meta *meta = NULL;
-
- if (req->hook_meta == NULL)
- return (-1);
-
- TAILQ_FOREACH(meta, &req->hook_meta->meta_data, next) {
- if (strcmp(meta->key, key) == 0) {
- *data = meta->data;
- *data_size = meta->data_size;
- return (0);
- }
- }
-
- return (-1);
-}
-
-struct evhttp_connection *
-evrpc_hook_get_connection(void *ctx)
-{
- struct evrpc_request_wrapper *req = ctx;
- return (req->hook_meta != NULL ? req->hook_meta->evcon : NULL);
-}
-
-int
-evrpc_send_request_generic(struct evrpc_pool *pool,
- void *request, void *reply,
- void (*cb)(struct evrpc_status *, void *, void *, void *),
- void *cb_arg,
- const char *rpcname,
- void (*req_marshal)(struct evbuffer *, void *),
- void (*rpl_clear)(void *),
- int (*rpl_unmarshal)(void *, struct evbuffer *))
-{
- struct evrpc_status status;
- struct evrpc_request_wrapper *ctx;
- ctx = evrpc_make_request_ctx(pool, request, reply,
- rpcname, req_marshal, rpl_clear, rpl_unmarshal, cb, cb_arg);
- if (ctx == NULL)
- goto error;
- return (evrpc_make_request(ctx));
-error:
- memset(&status, 0, sizeof(status));
- status.error = EVRPC_STATUS_ERR_UNSTARTED;
- (*(cb))(&status, request, reply, cb_arg);
- return (-1);
-}
-
-/** Takes a request object and fills it in with the right magic */
-static struct evrpc *
-evrpc_register_object(const char *name,
- void *(*req_new)(void*), void *req_new_arg, void (*req_free)(void *),
- int (*req_unmarshal)(void *, struct evbuffer *),
- void *(*rpl_new)(void*), void *rpl_new_arg, void (*rpl_free)(void *),
- int (*rpl_complete)(void *),
- void (*rpl_marshal)(struct evbuffer *, void *))
-{
- struct evrpc* rpc = (struct evrpc *)mm_calloc(1, sizeof(struct evrpc));
- if (rpc == NULL)
- return (NULL);
- rpc->uri = mm_strdup(name);
- if (rpc->uri == NULL) {
- mm_free(rpc);
- return (NULL);
- }
- rpc->request_new = req_new;
- rpc->request_new_arg = req_new_arg;
- rpc->request_free = req_free;
- rpc->request_unmarshal = req_unmarshal;
- rpc->reply_new = rpl_new;
- rpc->reply_new_arg = rpl_new_arg;
- rpc->reply_free = rpl_free;
- rpc->reply_complete = rpl_complete;
- rpc->reply_marshal = rpl_marshal;
- return (rpc);
-}
-
-int
-evrpc_register_generic(struct evrpc_base *base, const char *name,
- void (*callback)(struct evrpc_req_generic *, void *), void *cbarg,
- void *(*req_new)(void *), void *req_new_arg, void (*req_free)(void *),
- int (*req_unmarshal)(void *, struct evbuffer *),
- void *(*rpl_new)(void *), void *rpl_new_arg, void (*rpl_free)(void *),
- int (*rpl_complete)(void *),
- void (*rpl_marshal)(struct evbuffer *, void *))
-{
- struct evrpc* rpc =
- evrpc_register_object(name, req_new, req_new_arg, req_free, req_unmarshal,
- rpl_new, rpl_new_arg, rpl_free, rpl_complete, rpl_marshal);
- if (rpc == NULL)
- return (-1);
- evrpc_register_rpc(base, rpc,
- (void (*)(struct evrpc_req_generic*, void *))callback, cbarg);
- return (0);
-}
-
-/** accessors for obscure and undocumented functionality */
-struct evrpc_pool *
-evrpc_request_get_pool(struct evrpc_request_wrapper *ctx)
-{
- return (ctx->pool);
-}
-
-void
-evrpc_request_set_pool(struct evrpc_request_wrapper *ctx,
- struct evrpc_pool *pool)
-{
- ctx->pool = pool;
-}
-
-void
-evrpc_request_set_cb(struct evrpc_request_wrapper *ctx,
- void (*cb)(struct evrpc_status*, void *request, void *reply, void *arg),
- void *cb_arg)
-{
- ctx->cb = cb;
- ctx->cb_arg = cb_arg;
-}
projects / netatalk.git / blobdiff