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

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <strings.h>
   5 #include "../src/meshlink++.h"
   6
   7 class ChatMesh : public meshlink::mesh
   8 {
   9 public:
  10         void log(meshlink::log_level_t level, const char *text) {
  11                 const char *levelstr[] = {"DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"};
  12                 fprintf(stderr, "%s: %s\n", levelstr[level], text);
  13                 }
  14
  15         void receive(meshlink::node *source, const void *data, size_t len) {
  16                 const char *msg = (const char *)data;
  17
  18                 if(!len || msg[len - 1]) {
  19                         fprintf(stderr, "Received invalid data from %s\n", source->name);
  20                         return;
  21                 }
  22
  23                 printf("%s says: %s\n", source->name, msg);
  24         }
  25
  26         void node_status(meshlink::node *node, bool reachable) {
  27                 if(reachable)
  28                         printf("%s joined.\n", node->name);
  29                 else
  30                         printf("%s left.\n", node->name);
  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         if(arg)
  40                 *arg++ = 0;
  41
  42         if(!strcasecmp(buf, "invite")) {
  43                 char *invitation;
  44
  45                 if(!arg) {
  46                         fprintf(stderr, "/invite requires an argument!\n");
  47                         return;
  48                 }
  49
  50                 invitation = mesh->invite(arg);
  51                 if(!invitation) {
  52                         fprintf(stderr, "Could not invite '%s': %s\n", arg, meshlink::strerror());
  53                         return;
  54                 }
  55
  56                 printf("Invitation for %s: %s\n", arg, invitation);
  57                 free(invitation);
  58         } else if(!strcasecmp(buf, "join")) {
  59                 if(!arg) {
  60                         fprintf(stderr, "/join requires an argument!\n");
  61                         return;
  62                 }
  63
  64                 if(!mesh->join(arg))
  65                         fprintf(stderr, "Could not join using invitation: %s\n", meshlink::strerror());
  66                 else
  67                         fprintf(stderr, "Invitation accepted!\n");
  68         } else if(!strcasecmp(buf, "kick")) {
  69                 if(!arg) {
  70                         fprintf(stderr, "/kick requires an argument!\n");
  71                         return;
  72                 }
  73
  74                 meshlink::node *node = mesh->get_node(arg);
  75                 if(!node) {
  76                         fprintf(stderr, "Error looking up '%s': %s\n", arg, meshlink::strerror());
  77                         return;
  78                 }
  79
  80                 mesh->blacklist(node);
  81
  82                 printf("Node '%s' blacklisted.\n", arg);
  83         } else if(!strcasecmp(buf, "who")) {
  84                 if(!arg) {
  85                         nodes = mesh->get_all_nodes(nodes, &nnodes);
  86                         if(!nodes) {
  87                                 fprintf(stderr, "Could not get list of nodes: %s\n", meshlink::strerror());
  88                         } else {
  89                                 printf("%zu known nodes:", nnodes);
  90                                 for(size_t i = 0; i < nnodes; i++)
  91                                         printf(" %s", nodes[i]->name);
  92                                 printf("\n");
  93                         }
  94                 } else {
  95                         meshlink::node *node = mesh->get_node(arg);
  96                         if(!node) {
  97                                 fprintf(stderr, "Error looking up '%s': %s\n", arg, meshlink::strerror());
  98                         } else {
  99                                 printf("Node %s found\n", arg);
 100                         }
 101                 }
 102         } else if(!strcasecmp(buf, "quit")) {
 103                 printf("Bye!\n");
 104                 fclose(stdin);
 105         } else if(!strcasecmp(buf, "help")) {
 106                 printf(
 107                         "<name>: <message>     Send a message to the given node.\n"
 108                         "                      Subsequent messages don't need the <name>: prefix.\n"
 109                         "/invite <name>        Create an invitation for a new node.\n"
 110                         "/join <invitation>    Join an existing mesh using an invitation.\n"
 111                         "/kick <name>          Blacklist the given node.\n"
 112                         "/who [<name>]         List all nodes or show information about the given node.\n"
 113                         "/quit                 Exit this program.\n"
 114                         );
 115         } else {
 116                 fprintf(stderr, "Unknown command '/%s'\n", buf);
 117         }
 118 }
 119
 120 static void parse_input(meshlink::mesh *mesh, char *buf) {
 121         static meshlink::node *destination;
 122         size_t len;
 123
 124         if(!buf)
 125                 return;
 126
 127         // Remove newline.
 128
 129         len = strlen(buf);
 130
 131         if(len && buf[len - 1] == '\n')
 132                 buf[--len] = 0;
 133
 134         if(len && buf[len - 1] == '\r')
 135                 buf[--len] = 0;
 136
 137         // Ignore empty lines.
 138
 139         if(!len)
 140                 return;
 141
 142         // Commands start with '/'
 143
 144         if(*buf == '/')
 145                 return parse_command(mesh, buf + 1);
 146
 147         // Lines in the form "name: message..." set the destination node.
 148
 149         char *msg = buf;
 150         char *colon = strchr(buf, ':');
 151
 152         if(colon) {
 153                 *colon = 0;
 154                 msg = colon + 1;
 155                 if(*msg == ' ')
 156                         msg++;
 157
 158                 destination = mesh->get_node(buf);
 159                 if(!destination) {
 160                         fprintf(stderr, "Error looking up '%s': %s\n", buf, meshlink::strerror());
 161                         return;
 162                 }
 163         }
 164
 165         if(!destination) {
 166                 fprintf(stderr, "Who are you talking to? Write 'name: message...'\n");
 167                 return;
 168         }
 169
 170         if(!mesh->send(destination, msg, strlen(msg) + 1)) {
 171                 fprintf(stderr, "Could not send message to '%s': %s\n", destination->name, meshlink::strerror());
 172                 return;
 173         }
 174
 175         printf("Message sent to '%s'.\n", destination->name);
 176 }
 177
 178
 179 int main(int argc, char *argv[]) {
 180         const char *confbase = ".chat";
 181         const char *nick = NULL;
 182         char buf[1024];
 183
 184         if(argc > 1)
 185                 confbase = argv[1];
 186
 187         if(argc > 2)
 188                 nick = argv[2];
 189
 190         ChatMesh* mesh = meshlink::open<ChatMesh>(confbase, nick, "chatpp", STATIONARY);
 191
 192         if(!mesh) {
 193                 fprintf(stderr, "Could not open MeshLink: %s\n", meshlink::strerror());
 194                 return 1;
 195         }
 196
 197         if(!mesh->start()) {
 198                 fprintf(stderr, "Could not start MeshLink: %s\n", meshlink::strerror());
 199                 return 1;
 200         }
 201
 202         printf("Chat started.\nType /help for a list of commands.\n");
 203
 204         while(fgets(buf, sizeof buf, stdin))
 205                 parse_input(mesh, buf);
 206
 207         printf("Chat stopping.\n");
 208
 209         mesh->stop();
 210         meshlink::close(mesh);
 211
 212         return 0;
 213 }