git.meshlink.io Git - meshlink-tiny/blob - examples/chatpp.cc

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <strings.h>
   5 #include "../src/meshlink-tiny++.h"
   6
   7 class ChatMesh : public meshlink::mesh {
   8 public:
   9         void log(meshlink::log_level_t level, const char *text) {
  10                 const char *levelstr[] = {"DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"};
  11                 fprintf(stderr, "%s: %s\n", levelstr[level], text);
  12         }
  13
  14         void receive(meshlink::node *source, const void *data, size_t len) {
  15                 const char *msg = (const char *)data;
  16
  17                 if(!len || msg[len - 1]) {
  18                         fprintf(stderr, "Received invalid data from %s\n", source->name);
  19                         return;
  20                 }
  21
  22                 printf("%s says: %s\n", source->name, msg);
  23         }
  24
  25         void node_status(meshlink::node *node, bool reachable) {
  26                 if(reachable) {
  27                         printf("%s joined.\n", node->name);
  28                 } else {
  29                         printf("%s left.\n", node->name);
  30                 }
  31         }
  32 };
  33
  34 static meshlink::node **nodes;
  35 static size_t nnodes;
  36
  37 static void parse_command(meshlink::mesh *mesh, char *buf) {
  38         char *arg = strchr(buf, ' ');
  39
  40         if(arg) {
  41                 *arg++ = 0;
  42         }
  43
  44         if(!strcasecmp(buf, "join")) {
  45                 if(!arg) {
  46                         fprintf(stderr, "/join requires an argument!\n");
  47                         return;
  48                 }
  49
  50                 mesh->stop();
  51
  52                 if(!mesh->join(arg)) {
  53                         fprintf(stderr, "Could not join using invitation: %s\n", meshlink::strerror());
  54                 } else {
  55                         fprintf(stderr, "Invitation accepted!\n");
  56                 }
  57
  58                 if(!mesh->start()) {
  59                         fprintf(stderr, "Could not restart MeshLink: %s\n", meshlink::strerror());
  60                         exit(1);
  61                 }
  62         } else if(!strcasecmp(buf, "who")) {
  63                 if(!arg) {
  64                         nodes = mesh->get_all_nodes(nodes, &nnodes);
  65
  66                         if(!nodes) {
  67                                 fprintf(stderr, "Could not get list of nodes: %s\n", meshlink::strerror());
  68                         } else {
  69                                 printf("%lu known nodes:", (unsigned long)nnodes);
  70
  71                                 for(size_t i = 0; i < nnodes; i++) {
  72                                         printf(" %s", nodes[i]->name);
  73                                 }
  74
  75                                 printf("\n");
  76                         }
  77                 } else {
  78                         meshlink::node *node = mesh->get_node(arg);
  79
  80                         if(!node) {
  81                                 fprintf(stderr, "Error looking up '%s': %s\n", arg, meshlink::strerror());
  82                         } else {
  83                                 printf("Node %s found\n", arg);
  84                         }
  85                 }
  86         } else if(!strcasecmp(buf, "quit")) {
  87                 printf("Bye!\n");
  88                 fclose(stdin);
  89         } else if(!strcasecmp(buf, "help")) {
  90                 printf(
  91                         "<name>: <message>     Send a message to the given node.\n"
  92                         "                      Subsequent messages don't need the <name>: prefix.\n"
  93                         "/join <invitation>    Join an existing mesh using an invitation.\n"
  94                         "/kick <name>          Blacklist the given node.\n"
  95                         "/who [<name>]         List all nodes or show information about the given node.\n"
  96                         "/quit                 Exit this program.\n"
  97                 );
  98         } else {
  99                 fprintf(stderr, "Unknown command '/%s'\n", buf);
 100         }
 101 }
 102
 103 static void parse_input(meshlink::mesh *mesh, char *buf) {
 104         static meshlink::node *destination;
 105         size_t len;
 106
 107         if(!buf) {
 108                 return;
 109         }
 110
 111         // Remove newline.
 112
 113         len = strlen(buf);
 114
 115         if(len && buf[len - 1] == '\n') {
 116                 buf[--len] = 0;
 117         }
 118
 119         if(len && buf[len - 1] == '\r') {
 120                 buf[--len] = 0;
 121         }
 122
 123         // Ignore empty lines.
 124
 125         if(!len) {
 126                 return;
 127         }
 128
 129         // Commands start with '/'
 130
 131         if(*buf == '/') {
 132                 return parse_command(mesh, buf + 1);
 133         }
 134
 135         // Lines in the form "name: message..." set the destination node.
 136
 137         char *msg = buf;
 138         char *colon = strchr(buf, ':');
 139
 140         if(colon) {
 141                 *colon = 0;
 142                 msg = colon + 1;
 143
 144                 if(*msg == ' ') {
 145                         msg++;
 146                 }
 147
 148                 destination = mesh->get_node(buf);
 149
 150                 if(!destination) {
 151                         fprintf(stderr, "Error looking up '%s': %s\n", buf, meshlink::strerror());
 152                         return;
 153                 }
 154         }
 155
 156         if(!destination) {
 157                 fprintf(stderr, "Who are you talking to? Write 'name: message...'\n");
 158                 return;
 159         }
 160
 161         if(!mesh->send(destination, msg, strlen(msg) + 1)) {
 162                 fprintf(stderr, "Could not send message to '%s': %s\n", destination->name, meshlink::strerror());
 163                 return;
 164         }
 165
 166         printf("Message sent to '%s'.\n", destination->name);
 167 }
 168
 169
 170 int main(int argc, char *argv[]) {
 171         const char *confbase = ".chat";
 172         const char *nick = NULL;
 173         char buf[1024];
 174
 175         if(argc > 1) {
 176                 confbase = argv[1];
 177         }
 178
 179         if(argc > 2) {
 180                 nick = argv[2];
 181         }
 182
 183         ChatMesh mesh;
 184         mesh.open(confbase, nick, "chatpp", DEV_CLASS_STATIONARY);
 185
 186         if(!mesh.isOpen()) {
 187                 fprintf(stderr, "Could not open MeshLink: %s\n", meshlink::strerror());
 188                 return 1;
 189         }
 190
 191         if(!mesh.start()) {
 192                 fprintf(stderr, "Could not start MeshLink: %s\n", meshlink::strerror());
 193                 return 1;
 194         }
 195
 196         printf("Chat started.\nType /help for a list of commands.\n");
 197
 198         while(fgets(buf, sizeof(buf), stdin)) {
 199                 parse_input(&mesh, buf);
 200         }
 201
 202         printf("Chat stopping.\n");
 203
 204         mesh.stop();
 205         mesh.close();
 206
 207         return 0;
 208 }