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f12311ee69
When res_corosync detects that a node leaves or joins, it currently is
informed of this via Corosync callbacks. However, there are a few
limitations with the information presented:
(1) While we have information that Corosync is aware of - such as the
Corosync nodeid - that information is really only useful inside of
Corosync or res_corosync. There's no way to translate a Corosync
nodeid to some other internally useful unique identifier for the
Asterisk instance that just joined or left the cluster.
(2) While res_corosync is notified of the instance joining or leaving
the cluster, it has no mechanism to inform the Asterisk core or
other modules of this event. This limits the usefulness of res_corosync
as a heartbeat mechanism for other modules.
This patch addresses both issues.
First, it adds the notion of a cluster discovery message both within the
Stasis message bus, as well as the binary event messages that
res_corosync uses to transmit data back and forth within the cluster.
When Asterisk joins the cluster, it sends a discovery message to the other
nodes in the cluster, which correlates the Corosync nodeid along with
the Asterisk EID. res_corosync now maintains a hash of Corosync nodeids
to Asterisk EIDs, such that it can map changes in cluster state with the
Asterisk instance that has that nodeid. Likewise, when an Asterisk
instance receives a discovery message from a node in the cluster, it now
sends its own discovery message back to the originating node with the
local Asterisk EID. This lets Asterisk instances within the cluster
build a complete picture of the other Asterisk instances within the
cluster.
Second, it publishes the discovery messages onto the Stasis message bus.
Said messages are published whenever a node joins or leaves the cluster.
Interested modules can subscribe for the ast_cluster_discovery_type()
message under the ast_system_topic() and be notified when changes in
cluster state occur.
Change-Id: I9015f418d6ae7f47e4994e04e18948df4d49b465
363 lines
10 KiB
C
363 lines
10 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2007 - 2008, Digium, Inc.
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*
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* Russell Bryant <russell@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*!
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* \file
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* \author Russell Bryant <russell@digium.com>
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* \brief Generic event system
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*/
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#ifndef AST_EVENT_DEFS_H
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#define AST_EVENT_DEFS_H
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enum ast_event_type {
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/*! Reserved to provide the ability to subscribe to all events. A specific
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* event should never have a payload of 0. */
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AST_EVENT_ALL = 0x00,
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/*! This event type is reserved for use by third-party modules to create
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* custom events without having to modify this file.
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* \note There are no "custom" IE types, because IEs only have to be
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* unique to the event itself, not necessarily across all events. */
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AST_EVENT_CUSTOM = 0x01,
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/*! Voicemail message waiting indication */
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AST_EVENT_MWI = 0x02,
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/*! Someone has subscribed to events */
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AST_EVENT_SUB = 0x03,
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/*! Someone has unsubscribed from events */
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AST_EVENT_UNSUB = 0x04,
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/*! The aggregate state of a device across all servers configured to be
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* a part of a device state cluster has changed. */
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AST_EVENT_DEVICE_STATE = 0x05,
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/*! The state of a device has changed on _one_ server. This should not be used
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* directly, in general. Use AST_EVENT_DEVICE_STATE instead. */
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AST_EVENT_DEVICE_STATE_CHANGE = 0x06,
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/*! Channel Event Logging events */
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AST_EVENT_CEL = 0x07,
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/*! A report of a security related event (see security_events.h) */
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AST_EVENT_SECURITY = 0x08,
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/*! Used by res_stun_monitor to alert listeners to an exernal network address change. */
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AST_EVENT_NETWORK_CHANGE = 0x09,
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/*! The presence state for a presence provider */
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AST_EVENT_PRESENCE_STATE = 0x0a,
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/*! Used to alert listeners when a named ACL has changed. */
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AST_EVENT_ACL_CHANGE = 0x0b,
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/*! Send out a ping for debugging distributed events */
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AST_EVENT_PING = 0x0c,
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/*! A cluster discovery message */
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AST_EVENT_CLUSTER_DISCOVERY = 0x0d,
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/*! Number of event types. This should be the last event type + 1 */
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AST_EVENT_TOTAL = 0x0e,
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};
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/*! \brief Event Information Element types */
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enum ast_event_ie_type {
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/*! Used to terminate the arguments to event functions */
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AST_EVENT_IE_END = -1,
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/*!
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* \brief Number of new messages
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* Used by: AST_EVENT_MWI
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* Payload type: UINT
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*/
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AST_EVENT_IE_NEWMSGS = 0x0001,
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/*!
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* \brief Number of
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* Used by: AST_EVENT_MWI
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* Payload type: UINT
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*/
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AST_EVENT_IE_OLDMSGS = 0x0002,
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/*!
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* \brief Mailbox name \verbatim (mailbox[@context]) \endverbatim
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* Used by: AST_EVENT_MWI
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* Payload type: STR
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*/
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AST_EVENT_IE_MAILBOX = 0x0003,
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/*!
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* \brief Unique ID
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* Used by: AST_EVENT_SUB, AST_EVENT_UNSUB
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* Payload type: UINT
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*/
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AST_EVENT_IE_UNIQUEID = 0x0004,
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/*!
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* \brief Event type
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* Used by: AST_EVENT_SUB, AST_EVENT_UNSUB
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* Payload type: UINT
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*/
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AST_EVENT_IE_EVENTTYPE = 0x0005,
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/*!
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* \brief Hint that someone cares that an IE exists
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* Used by: AST_EVENT_SUB
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* Payload type: UINT (ast_event_ie_type)
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*/
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AST_EVENT_IE_EXISTS = 0x0006,
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/*!
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* \brief Device Name
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* Used by AST_EVENT_DEVICE_STATE_CHANGE
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* Payload type: STR
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*/
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AST_EVENT_IE_DEVICE = 0x0007,
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/*!
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* \brief Generic State IE
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* Used by AST_EVENT_DEVICE_STATE_CHANGE
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* Payload type: UINT
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* The actual state values depend on the event which
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* this IE is a part of.
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*/
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AST_EVENT_IE_STATE = 0x0008,
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/*!
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* \brief Context IE
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* Used by AST_EVENT_MWI
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* Payload type: str
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*/
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AST_EVENT_IE_CONTEXT = 0x0009,
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/*!
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* \brief Channel Event Type
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* Used by: AST_EVENT_CEL
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* Payload type: UINT
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*/
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AST_EVENT_IE_CEL_EVENT_TYPE = 0x000a,
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/*!
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* \brief Channel Event Time (seconds)
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* Used by: AST_EVENT_CEL
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* Payload type: UINT
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*/
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AST_EVENT_IE_CEL_EVENT_TIME = 0x000b,
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/*!
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* \brief Channel Event Time (micro-seconds)
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* Used by: AST_EVENT_CEL
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* Payload type: UINT
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*/
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AST_EVENT_IE_CEL_EVENT_TIME_USEC = 0x000c,
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/*!
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* \brief Channel Event User Event Name
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* Used by: AST_EVENT_CEL
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* Payload type: STR
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*/
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AST_EVENT_IE_CEL_USEREVENT_NAME = 0x000d,
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/*!
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* \brief Channel Event CID name
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* Used by: AST_EVENT_CEL
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* Payload type: STR
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*/
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AST_EVENT_IE_CEL_CIDNAME = 0x000e,
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/*!
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* \brief Channel Event CID num
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* Used by: AST_EVENT_CEL
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* Payload type: STR
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*/
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AST_EVENT_IE_CEL_CIDNUM = 0x000f,
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/*!
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* \brief Channel Event extension name
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* Used by: AST_EVENT_CEL
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* Payload type: STR
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*/
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AST_EVENT_IE_CEL_EXTEN = 0x0010,
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/*!
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* \brief Channel Event context name
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* Used by: AST_EVENT_CEL
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* Payload type: STR
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*/
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AST_EVENT_IE_CEL_CONTEXT = 0x0011,
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/*!
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* \brief Channel Event channel name
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* Used by: AST_EVENT_CEL
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* Payload type: STR
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*/
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AST_EVENT_IE_CEL_CHANNAME = 0x0012,
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/*!
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* \brief Channel Event app name
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* Used by: AST_EVENT_CEL
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* Payload type: STR
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*/
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AST_EVENT_IE_CEL_APPNAME = 0x0013,
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/*!
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* \brief Channel Event app args/data
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* Used by: AST_EVENT_CEL
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* Payload type: STR
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*/
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AST_EVENT_IE_CEL_APPDATA = 0x0014,
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/*!
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* \brief Channel Event AMA flags
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* Used by: AST_EVENT_CEL
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* Payload type: UINT
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*/
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AST_EVENT_IE_CEL_AMAFLAGS = 0x0015,
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/*!
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* \brief Channel Event AccountCode
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* Used by: AST_EVENT_CEL
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* Payload type: STR
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*/
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AST_EVENT_IE_CEL_ACCTCODE = 0x0016,
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/*!
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* \brief Channel Event UniqueID
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* Used by: AST_EVENT_CEL
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* Payload type: STR
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*/
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AST_EVENT_IE_CEL_UNIQUEID = 0x0017,
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/*!
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* \brief Channel Event Userfield
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* Used by: AST_EVENT_CEL
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* Payload type: STR
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*/
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AST_EVENT_IE_CEL_USERFIELD = 0x0018,
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/*!
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* \brief Channel Event CID ANI field
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* Used by: AST_EVENT_CEL
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* Payload type: STR
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*/
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AST_EVENT_IE_CEL_CIDANI = 0x0019,
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/*!
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* \brief Channel Event CID RDNIS field
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* Used by: AST_EVENT_CEL
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* Payload type: STR
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*/
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AST_EVENT_IE_CEL_CIDRDNIS = 0x001a,
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/*!
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* \brief Channel Event CID dnid
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* Used by: AST_EVENT_CEL
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* Payload type: STR
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*/
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AST_EVENT_IE_CEL_CIDDNID = 0x001b,
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/*!
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* \brief Channel Event Peer -- for Things involving multiple channels, like BRIDGE
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* Used by: AST_EVENT_CEL
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* Payload type: STR
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*/
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AST_EVENT_IE_CEL_PEER = 0x001c,
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/*!
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* \brief Channel Event LinkedID
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* Used by: AST_EVENT_CEL
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* Payload type: STR
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*/
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AST_EVENT_IE_CEL_LINKEDID = 0x001d,
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/*!
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* \brief Channel Event peeraccount
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* Used by: AST_EVENT_CEL
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* Payload type: STR
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*/
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AST_EVENT_IE_CEL_PEERACCT = 0x001e,
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/*!
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* \brief Channel Event extra data
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* Used by: AST_EVENT_CEL
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* Payload type: STR
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*/
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AST_EVENT_IE_CEL_EXTRA = 0x001f,
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/*!
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* \brief Description
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* Used by: AST_EVENT_SUB, AST_EVENT_UNSUB
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* Payload type: STR
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*/
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AST_EVENT_IE_DESCRIPTION = 0x0020,
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/*!
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* \brief Entity ID
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* Used by All events
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* Payload type: RAW
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* This IE indicates which server the event originated from
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*/
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AST_EVENT_IE_EID = 0x0021,
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AST_EVENT_IE_SECURITY_EVENT = 0x0022,
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AST_EVENT_IE_EVENT_VERSION = 0x0023,
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AST_EVENT_IE_SERVICE = 0x0024,
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AST_EVENT_IE_MODULE = 0x0025,
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AST_EVENT_IE_ACCOUNT_ID = 0x0026,
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AST_EVENT_IE_SESSION_ID = 0x0027,
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AST_EVENT_IE_SESSION_TV = 0x0028,
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AST_EVENT_IE_ACL_NAME = 0x0029,
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AST_EVENT_IE_LOCAL_ADDR = 0x002a,
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AST_EVENT_IE_REMOTE_ADDR = 0x002b,
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AST_EVENT_IE_EVENT_TV = 0x002c,
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AST_EVENT_IE_REQUEST_TYPE = 0x002d,
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AST_EVENT_IE_REQUEST_PARAMS = 0x002e,
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AST_EVENT_IE_AUTH_METHOD = 0x002f,
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AST_EVENT_IE_SEVERITY = 0x0030,
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AST_EVENT_IE_EXPECTED_ADDR = 0x0031,
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AST_EVENT_IE_CHALLENGE = 0x0032,
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AST_EVENT_IE_RESPONSE = 0x0033,
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AST_EVENT_IE_EXPECTED_RESPONSE = 0x0034,
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AST_EVENT_IE_RECEIVED_CHALLENGE = 0x0035,
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AST_EVENT_IE_RECEIVED_HASH = 0x0036,
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AST_EVENT_IE_USING_PASSWORD = 0x0037,
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AST_EVENT_IE_ATTEMPTED_TRANSPORT = 0x0038,
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AST_EVENT_IE_PRESENCE_PROVIDER = 0x0039,
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AST_EVENT_IE_PRESENCE_STATE = 0x003a,
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AST_EVENT_IE_PRESENCE_SUBTYPE = 0x003b,
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AST_EVENT_IE_PRESENCE_MESSAGE = 0x003c,
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/*!
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* \brief Event non-cachability flag
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* Used by: All events
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* Payload type: UINT
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*/
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AST_EVENT_IE_CACHABLE = 0x003d,
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/*!
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* \brief Cluster node ID
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* Used by: Corosync
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* Payload type: UINT
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*/
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AST_EVENT_IE_NODE_ID = 0x003e,
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/*! \brief Must be the last IE value +1 */
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AST_EVENT_IE_TOTAL = 0x003f,
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};
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/*!
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* \brief Payload types for event information elements
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*/
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enum ast_event_ie_pltype {
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AST_EVENT_IE_PLTYPE_UNKNOWN = -1,
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/*! Just check if it exists, not the value */
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AST_EVENT_IE_PLTYPE_EXISTS,
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/*! Unsigned Integer (Can be used for signed, too ...) */
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AST_EVENT_IE_PLTYPE_UINT,
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/*! String */
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AST_EVENT_IE_PLTYPE_STR,
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/*! Raw data, compared with memcmp */
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AST_EVENT_IE_PLTYPE_RAW,
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/*! Bit flags (unsigned integer, compared using boolean logic) */
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AST_EVENT_IE_PLTYPE_BITFLAGS,
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};
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/*!
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* \brief Results for checking for subscribers
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*
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* \ref ast_event_check_subscriber()
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*/
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enum ast_event_subscriber_res {
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/*! No subscribers exist */
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AST_EVENT_SUB_NONE,
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/*! At least one subscriber exists */
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AST_EVENT_SUB_EXISTS,
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};
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struct ast_event;
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struct ast_event_ie;
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struct ast_event_iterator;
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/*!
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* \brief supposed to be an opaque type
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*
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* This is only here so that it can be declared on the stack.
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*/
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struct ast_event_iterator {
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uint16_t event_len;
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const struct ast_event *event;
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struct ast_event_ie *ie;
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};
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#endif /* AST_EVENT_DEFS_H */
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