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Diffstat (limited to 'templates/native/app/xxxxxx-native-client.c')
| -rw-r--r-- | templates/native/app/xxxxxx-native-client.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/templates/native/app/xxxxxx-native-client.c b/templates/native/app/xxxxxx-native-client.c new file mode 100644 index 0000000..312fd1a --- /dev/null +++ b/templates/native/app/xxxxxx-native-client.c @@ -0,0 +1,242 @@ +/* + * Copyright (C) 2015, 2016 "IoT.bzh" + * Author "Fulup Ar Foll" <fulup@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 + +#include <stdlib.h> +#include <stdio.h> +#include <stdint.h> +#include <string.h> +#include <unistd.h> +#include <fcntl.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <errno.h> + +#include <systemd/sd-event.h> + +#include <afb/afb-wsj1.h> +#include <afb/afb-ws-client.h> + +/* declaration of functions */ +static void on_hangup(void *closure, struct afb_wsj1 *wsj1); +static void on_call(void *closure, const char *api, const char *verb, struct afb_wsj1_msg *msg); +static void on_event(void *closure, const char *event, struct afb_wsj1_msg *msg); +static int io_event_callback(sd_event_source *src, int fd, uint32_t revents, void *closure); +static void emit(const char *api, const char *verb, const char *object); + +/* the callback interface for wsj1 */ +static struct afb_wsj1_itf itf = { + .on_hangup = on_hangup, + .on_call = on_call, + .on_event = on_event +}; + +/* global variables */ +static struct afb_wsj1 *wsj1; +static int exonrep; +static int callcount; +static sd_event_source *evsrc; + +/* print usage of the program */ +static void usage(int status, char *arg0) +{ + char *name = strrchr(arg0, '/'); + name = name ? name + 1 : arg0; + fprintf(status ? stderr : stdout, "usage: %s uri [api verb [data]]\n", name); + exit(status); +} + +/* entry function */ +int main(int ac, char **av, char **env) +{ + int rc; + sd_event *loop; + + /* check the argument count */ + if (ac != 2 && ac != 4 && ac != 5) + usage(1, av[0]); + + /* emit error and exit if requested */ + if (!strcmp(av[1], "-h") || !strcmp(av[1], "--help")) + usage(0, av[0]); + + /* get the default event loop */ + rc = sd_event_default(&loop); + if (rc < 0) { + fprintf(stderr, "connection to default event loop failed: %s\n", strerror(-rc)); + return 1; + } + + /* connect the websocket wsj1 to the uri given by the first argument */ + wsj1 = afb_ws_client_connect_wsj1(loop,av[1], &itf, NULL); + if (wsj1 == NULL) { + fprintf(stderr, "connection to %s failed: %m\n", av[1]); + return 1; + } + + /* test the behaviour */ + if (ac == 2) { + /* get requests from stdin */ + fcntl(0, F_SETFL, O_NONBLOCK); + sd_event_add_io(loop, &evsrc, 0, EPOLLIN, io_event_callback, NULL); + } else { + /* the request is defined by the arguments */ + exonrep = 1; + emit(av[2], av[3], av[4]); + } + + /* loop until end */ + for(;;) + sd_event_run(loop, 30000000); + return 0; +} + +/* called when wsj1 hangsup */ +static void on_hangup(void *closure, struct afb_wsj1 *wsj1) +{ + printf("ON-HANGUP\n"); + exit(0); +} + +/* called when wsj1 receives a method invocation */ +static void on_call(void *closure, const char *api, const char *verb, struct afb_wsj1_msg *msg) +{ + int rc; + printf("ON-CALL %s/%s(%s)\n", api, verb, afb_wsj1_msg_object_s(msg)); + rc = afb_wsj1_reply_error_s(msg, "\"unimplemented\"", NULL); + if (rc < 0) + fprintf(stderr, "replying failed: %m\n"); +} + +/* called when wsj1 receives an event */ +static void on_event(void *closure, const char *event, struct afb_wsj1_msg *msg) +{ + printf("ON-EVENT %s(%s)\n", event, afb_wsj1_msg_object_s(msg)); +} + +/* called when wsj1 receives a reply */ +static void on_reply(void *closure, struct afb_wsj1_msg *msg) +{ + printf("ON-REPLY %s: %s\n", (char*)closure, afb_wsj1_msg_object_s(msg)); + free(closure); + callcount--; + if (exonrep && !callcount) + //afb_wsj1_hangup(afb_wsj1_msg_wsj1(msg)); + exit(0); +} + +/* makes a call */ +static void call(const char *api, const char *verb, const char *object) +{ + static int num = 0; + char *key; + int rc; + + /* allocates an id for the request */ + rc = asprintf(&key, "%d:%s/%s", ++num, api, verb); + + /* send the request */ + callcount++; + rc = afb_wsj1_call_s(wsj1, api, verb, object, on_reply, key); + if (rc < 0) { + fprintf(stderr, "calling %s/%s(%s) failed: %m\n", api, verb, object); + callcount--; + } +} + +/* sends an event */ +static void event(const char *event, const char *object) +{ + int rc; + + rc = afb_wsj1_send_event_s(wsj1, event, object); + if (rc < 0) + fprintf(stderr, "sending !%s(%s) failed: %m\n", event, object); +} + +/* emits either a call (when api!='!') or an event */ +static void emit(const char *api, const char *verb, const char *object) +{ + if (object == NULL || object[0] == 0) + object = "null"; + if (api[0] == '!' && api[1] == 0) + event(verb, object); + else + call(api, verb, object); +} + +/* called when something happens on stdin */ +static int io_event_callback(sd_event_source *src, int fd, uint32_t revents, void *closure) +{ + static size_t count = 0; + static char line[16384]; + static char sep[] = " \t"; + static char sepnl[] = " \t\n"; + + ssize_t rc; + size_t pos; + + /* read the buffer */ + do { rc = read(0, line + count, sizeof line - count); } while (rc < 0 && errno == EINTR); + if (rc < 0) { + fprintf(stderr, "read error: %m\n"); + exit(1); + } + if (rc == 0) { + if (!callcount) + exit(0); + exonrep = 1; + sd_event_source_unref(evsrc); + } + count += (size_t)rc; + + /* normalise the buffer content */ + /* TODO: handle backspace \x7f ? */ + + /* process the lines */ + pos = 0; + for(;;) { + size_t i, api[2], verb[2], rest[2]; + i = pos; + while(i < count && strchr(sep, line[i])) i++; + api[0] = i; while(i < count && !strchr(sepnl, line[i])) i++; api[1] = i; + while(i < count && strchr(sep, line[i])) i++; + verb[0] = i; while(i < count && !strchr(sepnl, line[i])) i++; verb[1] = i; + while(i < count && strchr(sep, line[i])) i++; + rest[0] = i; while(i < count && line[i] != '\n') i++; rest[1] = i; + if (i == count) break; + line[i++] = 0; + if (api[0] == api[1] || verb[0] == verb[1]) + fprintf(stderr, "bad line: %s\n", line+pos); + else { + line[api[1]] = line[verb[1]] = 0; + emit(line + api[0], line + verb[0], line + rest[0]); + } + pos = i; + } + count -= pos; + if (count == sizeof line) { + fprintf(stderr, "overflow\n"); + exit(1); + } + if (count) + memmove(line, line + pos, count); + return 1; +} + |