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Rewrite command queue handling. Each client still has a command queue,

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but there is also now a global command queue. Instead of command queues
being dispatched on demand from wherever the command happens to be
added, they are now all dispatched from the top level server
loop. Command queues may now also include callbacks as well as commands,
and items may be inserted after the current command as well as at the end.

This all makes command queues significantly more predictable and easier
to use, and avoids the complex multiple nested command queues used by
source-file, if-shell and friends.

A mass rename of struct cmdq to a better name (cmdq_item probably) is
coming.
This commit is contained in:
nicm
2016-10-16 17:55:14 +00:00
parent bfe14b5312
commit ddc4512d2e
29 changed files with 817 additions and 702 deletions
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29
control.c
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@ -49,6 +49,21 @@ control_write_buffer(struct client *c, struct evbuffer *buffer)
server_client_push_stdout(c);
}
/* Control error callback. */
static enum cmd_retval
control_error(struct cmd_q *cmdq, void *data)
{
struct client *c = cmdq->client;
char *error = data;
cmdq_guard(cmdq, "begin", 1);
control_write(c, "parse error: %s", error);
cmdq_guard(cmdq, "error", 1);
free(error);
return (CMD_RETURN_NORMAL);
}
/* Control input callback. Read lines and fire commands. */
void
control_callback(struct client *c, int closed, __unused void *data)
@ -56,6 +71,7 @@ control_callback(struct client *c, int closed, __unused void *data)
char *line, *cause;
struct cmd_list *cmdlist;
struct cmd *cmd;
struct cmd_q *cmdq;
if (closed)
c->flags |= CLIENT_EXIT;
@ -70,18 +86,13 @@ control_callback(struct client *c, int closed, __unused void *data)
}
if (cmd_string_parse(line, &cmdlist, NULL, 0, &cause) != 0) {
c->cmdq->time = time(NULL);
c->cmdq->number++;
cmdq_guard(c->cmdq, "begin", 1);
control_write(c, "parse error: %s", cause);
cmdq_guard(c->cmdq, "error", 1);
free(cause);
cmdq = cmdq_get_callback(control_error, cause);
cmdq_append(c, cmdq);
} else {
TAILQ_FOREACH(cmd, &cmdlist->list, qentry)
cmd->flags |= CMD_CONTROL;
cmdq_run(c->cmdq, cmdlist, NULL);
cmdq = cmdq_get_command(cmdlist, NULL, NULL, 0);
cmdq_append(c, cmdq);
cmd_list_free(cmdlist);
}