diff options
author | José Bollo <jose.bollo@iot.bzh> | 2017-04-14 19:47:57 +0200 |
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committer | José Bollo <jose.bollo@iot.bzh> | 2017-04-14 19:47:57 +0200 |
commit | 69d7968b9713dafa23268ee34516e50133ca8b36 (patch) | |
tree | 54359bc101c1dc4d7fd6298020dabf1a62674689 /src/afb-stub-ws.c | |
parent | 9e8b1e1d13cd9c382769014d43d6f2604b396968 (diff) |
Create afb-stub-ws by spliting afb-api-ws
The file afb-stub-ws only carries the protocol
of the internal remote calling conventions.
It as the following benefits:
- it easies transition to symetric connection (not planned)
- it allows to have server stub on client socket and
conversely, client stub on server socket (planned for
debugging).
Change-Id: I57dc8e78d7bd63427421a180abcb844f8313d37b
Signed-off-by: José Bollo <jose.bollo@iot.bzh>
Diffstat (limited to 'src/afb-stub-ws.c')
-rw-r--r-- | src/afb-stub-ws.c | 1170 |
1 files changed, 1170 insertions, 0 deletions
diff --git a/src/afb-stub-ws.c b/src/afb-stub-ws.c new file mode 100644 index 00000000..042ed252 --- /dev/null +++ b/src/afb-stub-ws.c @@ -0,0 +1,1170 @@ +/* + * Copyright (C) 2015, 2016, 2017 "IoT.bzh" + * Author José Bollo <jose.bollo@iot.bzh> + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#define _GNU_SOURCE + +#define NO_PLUGIN_VERBOSE_MACRO + +#include <stdlib.h> +#include <string.h> +#include <assert.h> +#include <fcntl.h> +#include <unistd.h> +#include <errno.h> +#include <endian.h> +#include <netdb.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/un.h> +#include <pthread.h> + +#include <json-c/json.h> +#include <systemd/sd-event.h> + +#include <afb/afb-req-itf.h> + +#include "afb-common.h" + +#include "afb-session.h" +#include "afb-cred.h" +#include "afb-ws.h" +#include "afb-msg-json.h" +#include "afb-api.h" +#include "afb-apiset.h" +#include "afb-stub-ws.h" +#include "afb-context.h" +#include "afb-evt.h" +#include "afb-xreq.h" +#include "verbose.h" + +struct client_call; +struct client_event; +struct afb_stub_ws; + +/************** constants for protocol definition *************************/ + +#define CHAR_FOR_CALL 'C' +#define CHAR_FOR_ANSWER_SUCCESS 'T' +#define CHAR_FOR_ANSWER_FAIL 'F' +#define CHAR_FOR_EVT_BROADCAST '*' +#define CHAR_FOR_EVT_ADD '+' +#define CHAR_FOR_EVT_DEL '-' +#define CHAR_FOR_EVT_PUSH '!' +#define CHAR_FOR_EVT_SUBSCRIBE 'S' +#define CHAR_FOR_EVT_UNSUBSCRIBE 'U' +#define CHAR_FOR_SUBCALL_CALL 'B' +#define CHAR_FOR_SUBCALL_REPLY 'R' + +/******************* handling subcalls *****************************/ + +/** + * Structure on server side for recording pending + * subcalls. + */ +struct server_subcall +{ + struct server_subcall *next; /**< next subcall for the client */ + uint32_t subcallid; /**< the subcallid */ + void (*callback)(void*, int, struct json_object*); /**< callback on completion */ + void *closure; /**< closure of the callback */ +}; + +/** + * Structure for sending back replies on client side + */ +struct client_subcall +{ + struct afb_stub_ws *stubws; /**< stub descriptor */ + uint32_t subcallid; /**< subcallid for the reply */ +}; + +/* + * structure for recording calls on client side + */ +struct client_call { + struct client_call *next; /* the next call */ + struct afb_stub_ws *stubws; /* the stub_ws */ + struct afb_xreq *xreq; /* the request handle */ + uint32_t msgid; /* the message identifier */ +}; + +/* + * structure for a ws request + */ +struct server_req { + struct afb_xreq xreq; /* the xreq */ + struct afb_stub_ws *stubws; /* the client of the request */ + uint32_t msgid; /* the incoming request msgid */ +}; + +/* + * structure for recording events on client side + */ +struct client_event +{ + struct client_event *next; + struct afb_event event; + int eventid; + int refcount; +}; + +/******************* client description part for server *****************************/ + +struct afb_stub_ws +{ + /* count of references */ + int refcount; + + /* file descriptor */ + int fd; + + /* resource control */ + pthread_mutex_t mutex; + + /* websocket */ + struct afb_ws *ws; + + /* listener for events (server side) */ + struct afb_evt_listener *listener; + + /* event replica (client side) */ + struct client_event *events; + + /* emitted calls (client side) */ + struct client_call *calls; + + /* credentials (server side) */ + struct afb_cred *cred; + + /* pending subcalls (server side) */ + struct server_subcall *subcalls; + + /* apiset */ + struct afb_apiset *apiset; + + /* the api name */ + char apiname[1]; +}; + +/******************* common useful tools **********************************/ + +/** + * translate a pointer to some integer + * @param ptr the pointer to translate + * @return an integer + */ +static inline uint32_t ptr2id(void *ptr) +{ + return (uint32_t)(((intptr_t)ptr) >> 6); +} + +/******************* serialisation part **********************************/ + +struct readbuf +{ + char *head, *end; +}; + +#define WRITEBUF_COUNT_MAX 32 +struct writebuf +{ + struct iovec iovec[WRITEBUF_COUNT_MAX]; + uint32_t uints[WRITEBUF_COUNT_MAX]; + int count; +}; + +static char *readbuf_get(struct readbuf *rb, uint32_t length) +{ + char *before = rb->head; + char *after = before + length; + if (after > rb->end) + return 0; + rb->head = after; + return before; +} + +static int readbuf_char(struct readbuf *rb, char *value) +{ + if (rb->head >= rb->end) + return 0; + *value = *rb->head++; + return 1; +} + +static int readbuf_uint32(struct readbuf *rb, uint32_t *value) +{ + char *after = rb->head + sizeof *value; + if (after > rb->end) + return 0; + memcpy(value, rb->head, sizeof *value); + rb->head = after; + *value = le32toh(*value); + return 1; +} + +static int readbuf_string(struct readbuf *rb, const char **value, size_t *length) +{ + uint32_t len; + if (!readbuf_uint32(rb, &len) || !len) + return 0; + if (length) + *length = (size_t)(len - 1); + return (*value = readbuf_get(rb, len)) != NULL && rb->head[-1] == 0; +} + +static int readbuf_object(struct readbuf *rb, struct json_object **object) +{ + const char *string; + struct json_object *o; + int rc = readbuf_string(rb, &string, NULL); + if (rc) { + o = json_tokener_parse(string); + if (o == NULL && strcmp(string, "null")) + o = json_object_new_string(string); + *object = o; + } + return rc; +} + +static int writebuf_put(struct writebuf *wb, const void *value, size_t length) +{ + int i = wb->count; + if (i == WRITEBUF_COUNT_MAX) + return 0; + wb->iovec[i].iov_base = (void*)value; + wb->iovec[i].iov_len = length; + wb->count = i + 1; + return 1; +} + +static int writebuf_char(struct writebuf *wb, char value) +{ + int i = wb->count; + if (i == WRITEBUF_COUNT_MAX) + return 0; + *(char*)&wb->uints[i] = value; + wb->iovec[i].iov_base = &wb->uints[i]; + wb->iovec[i].iov_len = 1; + wb->count = i + 1; + return 1; +} + +static int writebuf_uint32(struct writebuf *wb, uint32_t value) +{ + int i = wb->count; + if (i == WRITEBUF_COUNT_MAX) + return 0; + wb->uints[i] = htole32(value); + wb->iovec[i].iov_base = &wb->uints[i]; + wb->iovec[i].iov_len = sizeof wb->uints[i]; + wb->count = i + 1; + return 1; +} + +static int writebuf_string_length(struct writebuf *wb, const char *value, size_t length) +{ + uint32_t len = (uint32_t)++length; + return (size_t)len == length && len && writebuf_uint32(wb, len) && writebuf_put(wb, value, length); +} + +static int writebuf_string(struct writebuf *wb, const char *value) +{ + return writebuf_string_length(wb, value, strlen(value)); +} + +static int writebuf_object(struct writebuf *wb, struct json_object *object) +{ + const char *string = json_object_to_json_string_ext(object, JSON_C_TO_STRING_PLAIN); + return string != NULL && writebuf_string(wb, string); +} + +/******************* ws request part for server *****************/ + +/* decrement the reference count of the request and free/release it on falling to null */ +static void server_req_destroy_cb(struct afb_xreq *xreq) +{ + struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq); + + afb_context_disconnect(&wreq->xreq.context); + afb_cred_unref(wreq->xreq.cred); + json_object_put(wreq->xreq.json); + afb_stub_ws_unref(wreq->stubws); + free(wreq); +} + +static void server_req_success_cb(struct afb_xreq *xreq, struct json_object *obj, const char *info) +{ + int rc; + struct writebuf wb = { .count = 0 }; + struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq); + + if (writebuf_char(&wb, CHAR_FOR_ANSWER_SUCCESS) + && writebuf_uint32(&wb, wreq->msgid) + && writebuf_uint32(&wb, (uint32_t)wreq->xreq.context.flags) + && writebuf_string(&wb, info ? : "") + && writebuf_object(&wb, obj)) { + rc = afb_ws_binary_v(wreq->stubws->ws, wb.iovec, wb.count); + if (rc >= 0) + goto success; + } + ERROR("error while sending success"); +success: + json_object_put(obj); +} + +static void server_req_fail_cb(struct afb_xreq *xreq, const char *status, const char *info) +{ + int rc; + struct writebuf wb = { .count = 0 }; + struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq); + + if (writebuf_char(&wb, CHAR_FOR_ANSWER_FAIL) + && writebuf_uint32(&wb, wreq->msgid) + && writebuf_uint32(&wb, (uint32_t)wreq->xreq.context.flags) + && writebuf_string(&wb, status) + && writebuf_string(&wb, info ? : "")) { + rc = afb_ws_binary_v(wreq->stubws->ws, wb.iovec, wb.count); + if (rc >= 0) + return; + } + ERROR("error while sending fail"); +} + +static void server_req_subcall_cb(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cb_closure) +{ + int rc; + struct writebuf wb = { .count = 0 }; + struct server_subcall *sc, *osc; + struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq); + struct afb_stub_ws *stubws = wreq->stubws; + + sc = malloc(sizeof *sc); + if (!sc) { + + } else { + sc->callback = callback; + sc->closure = cb_closure; + + pthread_mutex_unlock(&stubws->mutex); + sc->subcallid = ptr2id(sc); + do { + sc->subcallid++; + osc = stubws->subcalls; + while(osc && osc->subcallid != sc->subcallid) + osc = osc->next; + } while (osc); + sc->next = stubws->subcalls; + stubws->subcalls = sc; + pthread_mutex_unlock(&stubws->mutex); + + if (writebuf_char(&wb, CHAR_FOR_SUBCALL_CALL) + && writebuf_uint32(&wb, wreq->msgid) + && writebuf_uint32(&wb, sc->subcallid) + && writebuf_string(&wb, api) + && writebuf_string(&wb, verb) + && writebuf_object(&wb, args)) { + rc = afb_ws_binary_v(wreq->stubws->ws, wb.iovec, wb.count); + if (rc >= 0) + return; + } + ERROR("error while sending fail"); + } +} + +static int server_req_subscribe_cb(struct afb_xreq *xreq, struct afb_event event) +{ + int rc, rc2; + struct writebuf wb = { .count = 0 }; + struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq); + + rc = afb_evt_add_watch(wreq->stubws->listener, event); + if (rc < 0) + return rc; + + if (writebuf_char(&wb, CHAR_FOR_EVT_SUBSCRIBE) + && writebuf_uint32(&wb, wreq->msgid) + && writebuf_uint32(&wb, (uint32_t)afb_evt_event_id(event)) + && writebuf_string(&wb, afb_evt_event_name(event))) { + rc2 = afb_ws_binary_v(wreq->stubws->ws, wb.iovec, wb.count); + if (rc2 >= 0) + goto success; + } + ERROR("error while subscribing event"); +success: + return rc; +} + +static int server_req_unsubscribe_cb(struct afb_xreq *xreq, struct afb_event event) +{ + int rc, rc2; + struct writebuf wb = { .count = 0 }; + struct server_req *wreq = CONTAINER_OF_XREQ(struct server_req, xreq); + + if (writebuf_char(&wb, CHAR_FOR_EVT_UNSUBSCRIBE) + && writebuf_uint32(&wb, wreq->msgid) + && writebuf_uint32(&wb, (uint32_t)afb_evt_event_id(event)) + && writebuf_string(&wb, afb_evt_event_name(event))) { + rc2 = afb_ws_binary_v(wreq->stubws->ws, wb.iovec, wb.count); + if (rc2 >= 0) + goto success; + } + ERROR("error while subscribing event"); +success: + rc = afb_evt_remove_watch(wreq->stubws->listener, event); + return rc; +} + +static const struct afb_xreq_query_itf server_req_xreq_itf = { + .success = server_req_success_cb, + .fail = server_req_fail_cb, + .unref = server_req_destroy_cb, + .subcall = server_req_subcall_cb, + .subscribe = server_req_subscribe_cb, + .unsubscribe = server_req_unsubscribe_cb +}; + +/******************* client part **********************************/ + +/* search a memorized call */ +static struct client_call *client_call_search(struct afb_stub_ws *stubws, uint32_t msgid) +{ + struct client_call *call; + + call = stubws->calls; + while (call != NULL && call->msgid != msgid) + call = call->next; + + return call; +} + +/* search the event */ +static struct client_event *client_event_search(struct afb_stub_ws *stubws, uint32_t eventid, const char *name) +{ + struct client_event *ev; + + ev = stubws->events; + while (ev != NULL && (ev->eventid != eventid || 0 != strcmp(afb_evt_event_name(ev->event), name))) + ev = ev->next; + + return ev; +} + + +/* allocates and init the memorizing call */ +static struct client_call *client_call_make(struct afb_stub_ws *stubws, struct afb_xreq *xreq) +{ + struct client_call *call; + + call = malloc(sizeof *call); + if (call != NULL) { + afb_xreq_addref(xreq); + call->xreq = xreq; + call->msgid = ptr2id(call); + while(client_call_search(stubws, call->msgid) != NULL) + call->msgid++; + call->stubws = stubws; + call->next = stubws->calls; + stubws->calls = call; + } + return call; +} + +/* free and release the memorizing call */ +static void client_call_destroy(struct client_call *call) +{ + struct client_call **prv; + + prv = &call->stubws->calls; + while (*prv != NULL) { + if (*prv == call) { + *prv = call->next; + break; + } + prv = &(*prv)->next; + } + + afb_xreq_unref(call->xreq); + free(call); +} + +/* get event data from the message */ +static int client_msg_event_read(struct readbuf *rb, uint32_t *eventid, const char **name) +{ + return readbuf_uint32(rb, eventid) && readbuf_string(rb, name, NULL); +} + +/* get event from the message */ +static int client_msg_event_get(struct afb_stub_ws *stubws, struct readbuf *rb, struct client_event **ev) +{ + const char *name; + uint32_t eventid; + + /* get event data from the message */ + if (!client_msg_event_read(rb, &eventid, &name)) { + ERROR("Invalid message"); + return 0; + } + + /* check conflicts */ + *ev = client_event_search(stubws, eventid, name); + if (*ev == NULL) { + ERROR("event %s not found", name); + return 0; + } + + return 1; +} + +/* get event from the message */ +static int client_msg_call_get(struct afb_stub_ws *stubws, struct readbuf *rb, struct client_call **call) +{ + uint32_t msgid; + + /* get event data from the message */ + if (!readbuf_uint32(rb, &msgid)) { + ERROR("Invalid message"); + return 0; + } + + /* get the call */ + *call = client_call_search(stubws, msgid); + if (*call == NULL) { + ERROR("message not found"); + return 0; + } + + return 1; +} + +/* read a subscrition message */ +static int client_msg_subscription_get(struct afb_stub_ws *stubws, struct readbuf *rb, struct client_call **call, struct client_event **ev) +{ + return client_msg_call_get(stubws, rb, call) && client_msg_event_get(stubws, rb, ev); +} + +/* adds an event */ +static void client_event_create(struct afb_stub_ws *stubws, struct readbuf *rb) +{ + size_t offset; + const char *name; + uint32_t eventid; + struct client_event *ev; + + /* get event data from the message */ + offset = client_msg_event_read(rb, &eventid, &name); + if (offset == 0) { + ERROR("Invalid message"); + return; + } + + /* check conflicts */ + ev = client_event_search(stubws, eventid, name); + if (ev != NULL) { + ev->refcount++; + return; + } + + /* no conflict, try to add it */ + ev = malloc(sizeof *ev); + if (ev != NULL) { + ev->event = afb_evt_create_event(name); + if (ev->event.closure == NULL) + free(ev); + else { + ev->refcount = 1; + ev->eventid = eventid; + ev->next = stubws->events; + stubws->events = ev; + return; + } + } + ERROR("can't create event %s, out of memory", name); +} + +/* removes an event */ +static void client_event_drop(struct afb_stub_ws *stubws, struct readbuf *rb) +{ + struct client_event *ev, **prv; + + /* retrieves the event */ + if (!client_msg_event_get(stubws, rb, &ev)) + return; + + /* decrease the reference count */ + if (--ev->refcount) + return; + + /* unlinks the event */ + prv = &stubws->events; + while (*prv != ev) + prv = &(*prv)->next; + *prv = ev->next; + + /* destroys the event */ + afb_event_drop(ev->event); + free(ev); +} + +/* subscribes an event */ +static void client_event_subscribe(struct afb_stub_ws *stubws, struct readbuf *rb) +{ + struct client_event *ev; + struct client_call *call; + + if (client_msg_subscription_get(stubws, rb, &call, &ev)) { + /* subscribe the request from the event */ + if (afb_xreq_subscribe(call->xreq, ev->event) < 0) + ERROR("can't subscribe: %m"); + } +} + +/* unsubscribes an event */ +static void client_event_unsubscribe(struct afb_stub_ws *stubws, struct readbuf *rb) +{ + struct client_event *ev; + struct client_call *call; + + if (client_msg_subscription_get(stubws, rb, &call, &ev)) { + /* unsubscribe the request from the event */ + if (afb_xreq_unsubscribe(call->xreq, ev->event) < 0) + ERROR("can't unsubscribe: %m"); + } +} + +/* receives broadcasted events */ +static void client_event_broadcast(struct afb_stub_ws *stubws, struct readbuf *rb) +{ + struct json_object *object; + const char *event; + + if (readbuf_string(rb, &event, NULL) && readbuf_object(rb, &object)) + afb_evt_broadcast(event, object); + else + ERROR("unreadable broadcasted event"); +} + +/* pushs an event */ +static void client_event_push(struct afb_stub_ws *stubws, struct readbuf *rb) +{ + struct client_event *ev; + struct json_object *object; + + if (client_msg_event_get(stubws, rb, &ev) && readbuf_object(rb, &object)) + afb_event_push(ev->event, object); + else + ERROR("unreadable push event"); +} + +static void client_reply_success(struct afb_stub_ws *stubws, struct readbuf *rb) +{ + struct client_call *call; + struct json_object *object; + const char *info; + uint32_t flags; + + /* retrieve the message data */ + if (!client_msg_call_get(stubws, rb, &call)) + return; + + if (readbuf_uint32(rb, &flags) + && readbuf_string(rb, &info, NULL) + && readbuf_object(rb, &object)) { + call->xreq->context.flags = (unsigned)flags; + afb_xreq_success(call->xreq, object, *info ? info : NULL); + } else { + /* failing to have the answer */ + afb_xreq_fail(call->xreq, "error", "ws error"); + } + client_call_destroy(call); +} + +static void client_reply_fail(struct afb_stub_ws *stubws, struct readbuf *rb) +{ + struct client_call *call; + const char *info, *status; + uint32_t flags; + + /* retrieve the message data */ + if (!client_msg_call_get(stubws, rb, &call)) + return; + + if (readbuf_uint32(rb, &flags) + && readbuf_string(rb, &status, NULL) + && readbuf_string(rb, &info, NULL)) { + call->xreq->context.flags = (unsigned)flags; + afb_xreq_fail(call->xreq, status, *info ? info : NULL); + } else { + /* failing to have the answer */ + afb_xreq_fail(call->xreq, "error", "ws error"); + } + client_call_destroy(call); +} + +/* send a subcall reply */ +static void client_send_subcall_reply(struct client_subcall *subcall, int iserror, json_object *object) +{ + int rc; + struct writebuf wb = { .count = 0 }; + char ie = (char)!!iserror; + + if (!writebuf_char(&wb, CHAR_FOR_SUBCALL_REPLY) + || !writebuf_uint32(&wb, subcall->subcallid) + || !writebuf_char(&wb, ie) + || !writebuf_object(&wb, object)) { + /* write error ? */ + return; + } + + rc = afb_ws_binary_v(subcall->stubws->ws, wb.iovec, wb.count); + if (rc >= 0) + return; + ERROR("error while sending subcall reply"); +} + +/* callback for subcall reply */ +static void client_subcall_reply_cb(void *closure, int iserror, json_object *object) +{ + client_send_subcall_reply(closure, iserror, object); + free(closure); +} + +/* received a subcall request */ +static void client_subcall(struct afb_stub_ws *stubws, struct readbuf *rb) +{ + struct client_subcall *subcall; + struct client_call *call; + const char *api, *verb; + uint32_t subcallid; + struct json_object *object; + + subcall = malloc(sizeof *subcall); + if (!subcall) + return; + + /* retrieve the message data */ + if (!client_msg_call_get(stubws, rb, &call)) + return; + + if (readbuf_uint32(rb, &subcallid) + && readbuf_string(rb, &api, NULL) + && readbuf_string(rb, &verb, NULL) + && readbuf_object(rb, &object)) { + subcall->stubws = stubws; + subcall->subcallid = subcallid; + afb_xreq_subcall(call->xreq, api, verb, object, client_subcall_reply_cb, subcall); + } +} + +/* callback when receiving binary data */ +static void client_on_binary(void *closure, char *data, size_t size) +{ + if (size > 0) { + struct afb_stub_ws *stubws = closure; + struct readbuf rb = { .head = data, .end = data + size }; + + pthread_mutex_lock(&stubws->mutex); + switch (*rb.head++) { + case CHAR_FOR_ANSWER_SUCCESS: /* success */ + client_reply_success(stubws, &rb); + break; + case CHAR_FOR_ANSWER_FAIL: /* fail */ + client_reply_fail(stubws, &rb); + break; + case CHAR_FOR_EVT_BROADCAST: /* broadcast */ + client_event_broadcast(stubws, &rb); + break; + case CHAR_FOR_EVT_ADD: /* creates the event */ + client_event_create(stubws, &rb); + break; + case CHAR_FOR_EVT_DEL: /* drops the event */ + client_event_drop(stubws, &rb); + break; + case CHAR_FOR_EVT_PUSH: /* pushs the event */ + client_event_push(stubws, &rb); + break; + case CHAR_FOR_EVT_SUBSCRIBE: /* subscribe event for a request */ + client_event_subscribe(stubws, &rb); + break; + case CHAR_FOR_EVT_UNSUBSCRIBE: /* unsubscribe event for a request */ + client_event_unsubscribe(stubws, &rb); + break; + case CHAR_FOR_SUBCALL_CALL: /* subcall */ + client_subcall(stubws, &rb); + break; + default: /* unexpected message */ + /* TODO: close the connection */ + break; + } + pthread_mutex_unlock(&stubws->mutex); + } + free(data); +} + +/* on call, propagate it to the ws service */ +static void client_call_cb(void * closure, struct afb_xreq *xreq) +{ + int rc; + struct client_call *call; + struct writebuf wb = { .count = 0 }; + const char *raw; + size_t szraw; + struct afb_stub_ws *stubws = closure; + + pthread_mutex_lock(&stubws->mutex); + + /* create the recording data */ + call = client_call_make(stubws, xreq); + if (call == NULL) { + afb_xreq_fail_f(xreq, "error", "out of memory"); + goto end; + } + + /* creates the call message */ + raw = afb_xreq_raw(xreq, &szraw); + if (raw == NULL) + goto internal_error; + if (!writebuf_char(&wb, CHAR_FOR_CALL) + || !writebuf_uint32(&wb, call->msgid) + || !writebuf_uint32(&wb, (uint32_t)xreq->context.flags) + || !writebuf_string(&wb, xreq->verb) + || !writebuf_string(&wb, afb_session_uuid(xreq->context.session)) + || !writebuf_string_length(&wb, raw, szraw)) + goto overflow; + + /* send */ + rc = afb_ws_binary_v(stubws->ws, wb.iovec, wb.count); + if (rc >= 0) + goto end; + + afb_xreq_fail(xreq, "error", "websocket sending error"); + goto clean_call; + +internal_error: + afb_xreq_fail(xreq, "error", "internal: raw is NULL!"); + goto clean_call; + +overflow: + afb_xreq_fail(xreq, "error", "overflow: size doesn't match 32 bits!"); + +clean_call: + client_call_destroy(call); +end: + pthread_mutex_unlock(&stubws->mutex); +} + +/******************* client description part for server *****************************/ + +/* on call, propagate it to the ws service */ +static void server_on_call(struct afb_stub_ws *stubws, struct readbuf *rb) +{ + struct server_req *wreq; + char *cverb; + const char *uuid, *verb; + uint32_t flags, msgid; + size_t lenverb; + struct json_object *object; + + afb_stub_ws_addref(stubws); + + /* reads the call message data */ + if (!readbuf_uint32(rb, &msgid) + || !readbuf_uint32(rb, &flags) + || !readbuf_string(rb, &verb, &lenverb) + || !readbuf_string(rb, &uuid, NULL) + || !readbuf_object(rb, &object)) + goto overflow; + + /* create the request */ + wreq = malloc(++lenverb + sizeof *wreq); + if (wreq == NULL) + goto out_of_memory; + + afb_xreq_init(&wreq->xreq, &server_req_xreq_itf); + wreq->stubws = stubws; + wreq->msgid = msgid; + cverb = (char*)&wreq[1]; + memcpy(cverb, verb, lenverb); + + /* init the context */ + if (afb_context_connect(&wreq->xreq.context, uuid, NULL) < 0) + goto unconnected; + wreq->xreq.context.flags = flags; + + /* makes the call */ + wreq->xreq.cred = afb_cred_addref(stubws->cred); + wreq->xreq.api = stubws->apiname; + wreq->xreq.verb = cverb; + wreq->xreq.json = object; + afb_xreq_process(&wreq->xreq, stubws->apiset); + return; + +unconnected: + free(wreq); +out_of_memory: + json_object_put(object); +overflow: + afb_stub_ws_unref(stubws); +} + +/* on subcall reply */ +static void server_on_subcall_reply(struct afb_stub_ws *stubws, struct readbuf *rb) +{ + char iserror; + uint32_t subcallid; + struct json_object *object; + struct server_subcall *sc, **psc; + + /* reads the call message data */ + if (!readbuf_uint32(rb, &subcallid) + || !readbuf_char(rb, &iserror) + || !readbuf_object(rb, &object)) { + /* TODO bad protocol */ + return; + } + + /* search the subcall and unlink it */ + pthread_mutex_lock(&stubws->mutex); + psc = &stubws->subcalls; + while ((sc = *psc) && sc->subcallid != subcallid) + psc = &sc->next; + if (!sc) { + pthread_mutex_unlock(&stubws->mutex); + /* TODO subcall not found */ + } else { + *psc = sc->next; + pthread_mutex_unlock(&stubws->mutex); + sc->callback(sc->closure, (int)iserror, object); + free(sc); + } + json_object_put(object); +} + +/* callback when receiving binary data */ +static void server_on_binary(void *closure, char *data, size_t size) +{ + if (size > 0) { + struct readbuf rb = { .head = data, .end = data + size }; + switch (*rb.head++) { + case CHAR_FOR_CALL: + server_on_call(closure, &rb); + break; + case CHAR_FOR_SUBCALL_REPLY: + server_on_subcall_reply(closure, &rb); + break; + default: /* unexpected message */ + /* TODO: close the connection */ + break; + } + } + free(data); +} + +/******************* server part: manage events **********************************/ + +static void server_event_send(struct afb_stub_ws *stubws, char order, const char *event, int eventid, const char *data) +{ + int rc; + struct writebuf wb = { .count = 0 }; + + if (writebuf_char(&wb, order) + && writebuf_uint32(&wb, eventid) + && writebuf_string(&wb, event) + && (data == NULL || writebuf_string(&wb, data))) { + rc = afb_ws_binary_v(stubws->ws, wb.iovec, wb.count); + if (rc >= 0) + return; + } + ERROR("error while sending %c for event %s", order, event); +} + +static void server_event_add(void *closure, const char *event, int eventid) +{ + server_event_send(closure, CHAR_FOR_EVT_ADD, event, eventid, NULL); +} + +static void server_event_remove(void *closure, const char *event, int eventid) +{ + server_event_send(closure, CHAR_FOR_EVT_DEL, event, eventid, NULL); +} + +static void server_event_push(void *closure, const char *event, int eventid, struct json_object *object) +{ + const char *data = json_object_to_json_string_ext(object, JSON_C_TO_STRING_PLAIN); + server_event_send(closure, CHAR_FOR_EVT_PUSH, event, eventid, data ? : "null"); + json_object_put(object); +} + +static void server_event_broadcast(void *closure, const char *event, int eventid, struct json_object *object) +{ + int rc; + struct afb_stub_ws *stubws = closure; + + struct writebuf wb = { .count = 0 }; + + if (writebuf_char(&wb, CHAR_FOR_EVT_BROADCAST) && writebuf_string(&wb, event) && writebuf_object(&wb, object)) { + rc = afb_ws_binary_v(stubws->ws, wb.iovec, wb.count); + if (rc < 0) + ERROR("error while broadcasting event %s", event); + } else + ERROR("error while broadcasting event %s", event); + json_object_put(object); +} + +/*****************************************************/ + +/* callback when receiving a hangup */ +static void server_on_hangup(void *closure) +{ + struct afb_stub_ws *stubws = closure; + + /* close the socket */ + if (stubws->fd >= 0) { + close(stubws->fd); + stubws->fd = -1; + } + + /* release the client */ + afb_stub_ws_unref(stubws); +} + +/*****************************************************/ + +/* the interface for events pushing */ +static const struct afb_evt_itf server_evt_itf = { + .broadcast = server_event_broadcast, + .push = server_event_push, + .add = server_event_add, + .remove = server_event_remove +}; + +static const struct afb_ws_itf stub_ws_client_ws_itf = +{ + .on_close = NULL, + .on_text = NULL, + .on_binary = client_on_binary, + .on_error = NULL, + .on_hangup = NULL +}; + +static const struct afb_ws_itf server_ws_itf = +{ + .on_close = NULL, + .on_text = NULL, + .on_binary = server_on_binary, + .on_error = NULL, + .on_hangup = server_on_hangup +}; + +static struct afb_api_itf ws_api_itf = { + .call = client_call_cb +}; + +/*****************************************************/ + +static struct afb_stub_ws *afb_stub_ws_create(int fd, const char *apiname, struct afb_apiset *apiset, const struct afb_ws_itf *itf) +{ + struct afb_stub_ws *stubws; + + stubws = calloc(1, sizeof *stubws + strlen(apiname)); + if (stubws == NULL) + errno = ENOMEM; + else { + fcntl(fd, F_SETFD, FD_CLOEXEC); + fcntl(fd, F_SETFL, O_NONBLOCK); + stubws->ws = afb_ws_create(afb_common_get_event_loop(), fd, itf, stubws); + if (stubws->ws != NULL) { + stubws->fd = fd; + strcpy(stubws->apiname, apiname); + stubws->apiset = afb_apiset_addref(apiset); + stubws->refcount = 1; + stubws->subcalls = NULL; + return stubws; + } + free(stubws); + } + return NULL; +} + +struct afb_stub_ws *afb_stub_ws_create_client(int fd, const char *apiname, struct afb_apiset *apiset) +{ + struct afb_api afb_api; + struct afb_stub_ws *stubws; + + stubws = afb_stub_ws_create(fd, apiname, apiset, &stub_ws_client_ws_itf); + if (stubws) { + afb_api.closure = stubws; + afb_api.itf = &ws_api_itf; + if (afb_apiset_add(apiset, stubws->apiname, afb_api) >= 0) + return stubws; + afb_stub_ws_unref(stubws); + } + return NULL; + +} + +struct afb_stub_ws *afb_stub_ws_create_server(int fd, const char *apiname, struct afb_apiset *apiset) +{ + struct afb_stub_ws *stubws; + + stubws = afb_stub_ws_create(fd, apiname, apiset, &server_ws_itf); + if (stubws) { + stubws->cred = afb_cred_create_for_socket(fd); + stubws->listener = afb_evt_listener_create(&server_evt_itf, stubws); + if (stubws->listener != NULL) + return stubws; + afb_stub_ws_unref(stubws); + } + return NULL; +} + +void afb_stub_ws_unref(struct afb_stub_ws *stubws) +{ + struct server_subcall *sc, *nsc; + + if (!__atomic_sub_fetch(&stubws->refcount, 1, __ATOMIC_RELAXED)) { + afb_evt_listener_unref(stubws->listener); + afb_ws_destroy(stubws->ws); + nsc = stubws->subcalls; + while (nsc) { + sc= nsc; + nsc = sc->next; + sc->callback(sc->closure, 1, NULL); + free(sc); + } + afb_cred_unref(stubws->cred); + afb_apiset_unref(stubws->apiset); + free(stubws); + } +} + +void afb_stub_ws_addref(struct afb_stub_ws *stubws) +{ + __atomic_add_fetch(&stubws->refcount, 1, __ATOMIC_RELAXED); +} + +/* +static void client_disconnect(struct afb_stub_ws *stubws) +{ + if (stubws->fd >= 0) { + afb_ws_destroy(stubws->ws); + stubws->ws = NULL; + close(stubws->fd); + stubws->fd = -1; + } +} +*/ + |