mirror of https://gerrit.osmocom.org/libosmocore
libctrl: Add support for 'deferred control commands'
Sometimes a control interface command cannot be processed and responded immediately, but we need to process it asynchronously. In order to support this, we introduce the 'ctrl_cmd_def', which represents such a deferred command. It is created by the service implementing the command using ctrl_cmd_def_make(), and a response is later sent using ctrl_cmd_def_send(). ctrl_cmd_def_is_zombie() must be called to handle the case where the control connection has disconnected/died between receiving the command and sending the response.
This commit is contained in:
parent
5e21131c8d
commit
39c9e7b471
|
@ -45,6 +45,9 @@ struct ctrl_connection {
|
|||
|
||||
/* Pending commands for this connection */
|
||||
struct llist_head cmds;
|
||||
|
||||
/* Pending deferred commands for this connection */
|
||||
struct llist_head def_cmds;
|
||||
};
|
||||
|
||||
struct ctrl_cmd {
|
||||
|
@ -75,6 +78,18 @@ struct ctrl_cmd_map {
|
|||
enum ctrl_type type;
|
||||
};
|
||||
|
||||
/* deferred control command, i.e. responded asynchronously */
|
||||
struct ctrl_cmd_def {
|
||||
struct llist_head list; /* ctrl_connection.def_cmds */
|
||||
struct ctrl_cmd *cmd;
|
||||
void *data; /* opaque user data */
|
||||
};
|
||||
|
||||
struct ctrl_cmd_def *
|
||||
ctrl_cmd_def_make(const void *ctx, struct ctrl_cmd *cmd, void *data, unsigned int secs);
|
||||
int ctrl_cmd_def_is_zombie(struct ctrl_cmd_def *cd);
|
||||
int ctrl_cmd_def_send(struct ctrl_cmd_def *cd);
|
||||
|
||||
int ctrl_cmd_exec(vector vline, struct ctrl_cmd *command, vector node, void *data);
|
||||
int ctrl_cmd_install(enum ctrl_node_type node, struct ctrl_cmd_element *cmd);
|
||||
int ctrl_cmd_send(struct osmo_wqueue *queue, struct ctrl_cmd *cmd);
|
||||
|
|
|
@ -487,3 +487,63 @@ err:
|
|||
msgb_free(msg);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
struct ctrl_cmd_def *
|
||||
ctrl_cmd_def_make(const void *ctx, struct ctrl_cmd *cmd, void *data, unsigned int secs)
|
||||
{
|
||||
struct ctrl_cmd_def *cd;
|
||||
|
||||
if (!cmd->ccon)
|
||||
return NULL;
|
||||
|
||||
cd = talloc_zero(ctx, struct ctrl_cmd_def);
|
||||
|
||||
cd->cmd = cmd;
|
||||
cd->data = data;
|
||||
|
||||
/* add to per-connection list of deferred commands */
|
||||
llist_add(&cd->list, &cmd->ccon->def_cmds);
|
||||
|
||||
return cd;
|
||||
}
|
||||
|
||||
int ctrl_cmd_def_is_zombie(struct ctrl_cmd_def *cd)
|
||||
{
|
||||
/* luckily we're still alive */
|
||||
if (cd->cmd)
|
||||
return 0;
|
||||
|
||||
/* if we are a zombie, make sure we really die */
|
||||
llist_del(&cd->list);
|
||||
talloc_free(cd);
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
int ctrl_cmd_def_send(struct ctrl_cmd_def *cd)
|
||||
{
|
||||
struct ctrl_cmd *cmd = cd->cmd;
|
||||
|
||||
int rc;
|
||||
|
||||
/* Deferred commands can only be responses to GET/SET or ERROR, but
|
||||
* never TRAP or anything else */
|
||||
switch (cmd->type) {
|
||||
case CTRL_TYPE_GET:
|
||||
cmd->type = CTRL_TYPE_GET_REPLY;
|
||||
break;
|
||||
case CTRL_TYPE_SET:
|
||||
cmd->type = CTRL_TYPE_SET_REPLY;
|
||||
break;
|
||||
default:
|
||||
cmd->type = CTRL_TYPE_ERROR;
|
||||
}
|
||||
|
||||
rc = ctrl_cmd_send(&cmd->ccon->write_queue, cmd);
|
||||
|
||||
talloc_free(cmd);
|
||||
llist_del(&cd->list);
|
||||
talloc_free(cd);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
|
|
@ -128,6 +128,8 @@ struct ctrl_cmd *ctrl_cmd_trap(struct ctrl_cmd *cmd)
|
|||
|
||||
static void control_close_conn(struct ctrl_connection *ccon)
|
||||
{
|
||||
struct ctrl_cmd_def *cd, *cd2;
|
||||
|
||||
osmo_wqueue_clear(&ccon->write_queue);
|
||||
close(ccon->write_queue.bfd.fd);
|
||||
osmo_fd_unregister(&ccon->write_queue.bfd);
|
||||
|
@ -135,6 +137,19 @@ static void control_close_conn(struct ctrl_connection *ccon)
|
|||
if (ccon->closed_cb)
|
||||
ccon->closed_cb(ccon);
|
||||
msgb_free(ccon->pending_msg);
|
||||
|
||||
/* clean up deferred commands */
|
||||
llist_for_each_entry_safe(cd, cd2, &ccon->def_cmds, list) {
|
||||
/* delete from list of def_cmds for this ccon */
|
||||
llist_del(&cd->list);
|
||||
/* not strictly needed as this is a slave to the ccon which we
|
||||
* are about to free anyway */
|
||||
talloc_free(cd->cmd);
|
||||
/* set the CMD to null, this is the indication to the user that
|
||||
* the connection for this command has gone */
|
||||
cd->cmd = NULL;
|
||||
}
|
||||
|
||||
talloc_free(ccon);
|
||||
}
|
||||
|
||||
|
@ -338,6 +353,8 @@ static struct ctrl_connection *ctrl_connection_alloc(void *ctx)
|
|||
/* Error handling here? */
|
||||
|
||||
INIT_LLIST_HEAD(&ccon->cmds);
|
||||
INIT_LLIST_HEAD(&ccon->def_cmds);
|
||||
|
||||
return ccon;
|
||||
}
|
||||
|
||||
|
|
Loading…
Reference in New Issue