mdw@git.distorted.org.uk Git - disorder/blob - disobedience/client.c

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2006 Richard Kettlewell
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  18  * USA
  19  */
  20
  21 #include "disobedience.h"
  22
  23 /* GSource subclass for disorder_eclient */
  24 struct eclient_source {
  25   GSource gsource;
  26   disorder_eclient *client;
  27   time_t last_poll;
  28   GPollFD pollfd;
  29 };
  30
  31 /* Called before FDs are polled to choose a timeout.  We ask for a 3s
  32  * timeout and every 10s or so we force a dispatch.  */
  33 static gboolean gtkclient_prepare(GSource *source,
  34                                   gint *timeout) {
  35   const struct eclient_source *esource = (struct eclient_source *)source;
  36   D(("gtkclient_prepare"));
  37   if(time(0) > esource->last_poll + 10)
  38     return TRUE;                /* timed out */
  39   *timeout = 3000/*milliseconds*/;
  40   return FALSE;                 /* please poll */
  41 }
  42
  43 /* Check whether we're ready to dispatch. */
  44 static gboolean gtkclient_check(GSource *source) {
  45   const struct eclient_source *esource = (struct eclient_source *)source;
  46   D(("gtkclient_check fd=%d events=%x revents=%x",
  47      esource->pollfd.fd, esource->pollfd.events, esource->pollfd.revents));
  48   return esource->pollfd.fd != -1 && esource->pollfd.revents != 0;
  49 }
  50
  51 /* Dispatch */
  52 static gboolean gtkclient_dispatch(GSource *source,
  53                                    GSourceFunc attribute((unused)) callback,
  54                                    gpointer attribute((unused)) user_data) {
  55   struct eclient_source *esource = (struct eclient_source *)source;
  56   unsigned revents,  mode;
  57
  58   D(("gtkclient_dispatch"));
  59   revents = esource->pollfd.revents & esource->pollfd.events;
  60   mode = 0;
  61   if(revents & (G_IO_IN|G_IO_HUP|G_IO_ERR))
  62     mode |= DISORDER_POLL_READ;
  63   if(revents & (G_IO_OUT|G_IO_HUP|G_IO_ERR))
  64     mode |= DISORDER_POLL_WRITE;
  65   time(&esource->last_poll);
  66   disorder_eclient_polled(esource->client, mode);
  67   return TRUE;                          /* ??? not documented */
  68 }
  69
  70 /* Table of callbacks for GSource subclass */
  71 static const GSourceFuncs sourcefuncs = {
  72   gtkclient_prepare,
  73   gtkclient_check,
  74   gtkclient_dispatch,
  75   0,
  76   0,
  77   0,
  78 };
  79
  80 /* Tell the mainloop what we need */
  81 static void gtkclient_poll(void *u,
  82                            disorder_eclient attribute((unused)) *c,
  83                            int fd, unsigned mode) {
  84   struct eclient_source *esource = u;
  85   GSource *source = u;
  86
  87   D(("gtkclient_poll fd=%d mode=%x", fd, mode));
  88   /* deconfigure the source if currently configured */
  89   if(esource->pollfd.fd != -1) {
  90     D(("calling g_source_remove_poll"));
  91     g_source_remove_poll(source, &esource->pollfd);
  92     esource->pollfd.fd = -1;
  93     esource->pollfd.events = 0;
  94   }
  95   /* install new settings */
  96   if(fd != -1 && mode) {
  97     esource->pollfd.fd = fd;
  98     esource->pollfd.events = 0;
  99     if(mode & DISORDER_POLL_READ)
 100       esource->pollfd.events |= G_IO_IN | G_IO_HUP | G_IO_ERR;
 101     if(mode & DISORDER_POLL_WRITE)
 102       esource->pollfd.events |= G_IO_OUT | G_IO_ERR;
 103     /* reconfigure the source */
 104     D(("calling g_source_add_poll"));
 105     g_source_add_poll(source, &esource->pollfd);
 106   }
 107 }
 108
 109 /* Report a communication-level error.  It will be automatically retried. */
 110 static void gtkclient_comms_error(void attribute((unused)) *u,
 111                                   const char *msg) {
 112   D(("gtkclient_comms_error %s", msg));
 113   /* Control buttons might have become unusable */
 114   control_update();
 115   menu_update(-1);
 116   gtk_label_set_text(GTK_LABEL(report_label), msg);
 117 }
 118
 119 /* Report a protocol error.  It will not be retried.  We offer a callback to
 120  * the submitter of the original command and if none is supplied we pop up an
 121  * error box. */
 122 static void gtkclient_protocol_error(void attribute((unused)) *u,
 123                                      void *v,
 124                                      int code,
 125                                      const char *msg) {
 126   struct callbackdata *cbd = v;
 127
 128   D(("gtkclient_protocol_error %s", msg));
 129   if(cbd && cbd->onerror)
 130     cbd->onerror(cbd, code, msg);
 131   else
 132     popup_protocol_error(code, msg);
 133 }
 134
 135 static void gtkclient_report(void attribute((unused)) *u,
 136                              const char *msg) {
 137   if(!msg)
 138     /* We're idle - clear the report line */
 139     gtk_label_set_text(GTK_LABEL(report_label), "");
 140   control_update();
 141   menu_update(-1);
 142 }
 143
 144 void popup_protocol_error(int attribute((unused)) code,
 145                           const char *msg) {
 146   gtk_label_set_text(GTK_LABEL(report_label), msg);
 147   popup_error(msg);
 148 }
 149
 150 /* Table of eclient callbacks */
 151 static const disorder_eclient_callbacks gtkclient_callbacks = {
 152   gtkclient_comms_error,
 153   gtkclient_protocol_error,
 154   gtkclient_poll,
 155   gtkclient_report
 156 };
 157
 158 /* Create an eclient using the GLib main loop */
 159 disorder_eclient *gtkclient(void) {
 160   GSource *source;
 161   struct eclient_source *esource;
 162
 163   D(("gtkclient"));
 164   source = g_source_new((GSourceFuncs *)&sourcefuncs,
 165                         sizeof (struct eclient_source));
 166   esource = (struct eclient_source *)source;
 167   esource->pollfd.fd = -1;
 168   esource->client = disorder_eclient_new(&gtkclient_callbacks, source);
 169   if(!esource->client) {
 170     g_source_destroy(source);
 171     return 0;
 172   }
 173   g_source_attach(source, 0);
 174   return esource->client;
 175 }
 176
 177 /*
 178 Local Variables:
 179 c-basic-offset:2
 180 comment-column:40
 181 fill-column:79
 182 indent-tabs-mode:nil
 183 End:
 184 */