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AsyncMessenger.h
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AsyncMessenger.h
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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2014 UnitedStack <haomai@unitedstack.com>
*
* Author: Haomai Wang <haomaiwang@gmail.com>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#ifndef CEPH_ASYNCMESSENGER_H
#define CEPH_ASYNCMESSENGER_H
#include "include/types.h"
#include "include/xlist.h"
#include <list>
#include <map>
using namespace std;
#include "include/unordered_map.h"
#include "include/unordered_set.h"
#include "common/Mutex.h"
#include "include/atomic.h"
#include "common/Cond.h"
#include "common/Thread.h"
#include "common/Throttle.h"
#include "msg/SimplePolicyMessenger.h"
#include "msg/DispatchQueue.h"
#include "include/assert.h"
#include "AsyncConnection.h"
#include "Event.h"
#include "common/simple_spin.h"
class AsyncMessenger;
class WorkerPool;
enum {
l_msgr_first = 94000,
l_msgr_recv_messages,
l_msgr_send_messages,
l_msgr_send_messages_inline,
l_msgr_recv_bytes,
l_msgr_send_bytes,
l_msgr_created_connections,
l_msgr_active_connections,
l_msgr_last,
};
class Worker;
/**
* If the Messenger binds to a specific address, the Processor runs
* and listens for incoming connections.
*/
class Processor {
AsyncMessenger *msgr;
NetHandler net;
Worker *worker;
int listen_sd;
uint64_t nonce;
EventCallbackRef listen_handler;
class C_processor_accept : public EventCallback {
Processor *pro;
public:
explicit C_processor_accept(Processor *p): pro(p) {}
void do_request(int id) {
pro->accept();
}
};
public:
Processor(AsyncMessenger *r, CephContext *c, uint64_t n)
: msgr(r), net(c), worker(NULL), listen_sd(-1), nonce(n), listen_handler(new C_processor_accept(this)) {}
~Processor() { delete listen_handler; };
void stop();
int bind(const entity_addr_t &bind_addr, const set<int>& avoid_ports);
int rebind(const set<int>& avoid_port);
int start(Worker *w);
void accept();
};
/*
* AsyncMessenger is represented for maintaining a set of asynchronous connections,
* it may own a bind address and the accepted connections will be managed by
* AsyncMessenger.
*
*/
class AsyncMessenger : public SimplePolicyMessenger {
// First we have the public Messenger interface implementation...
public:
/**
* Initialize the AsyncMessenger!
*
* @param cct The CephContext to use
* @param name The name to assign ourselves
* _nonce A unique ID to use for this AsyncMessenger. It should not
* be a value that will be repeated if the daemon restarts.
*/
AsyncMessenger(CephContext *cct, entity_name_t name,
string mname, uint64_t _nonce, uint64_t features);
/**
* Destroy the AsyncMessenger. Pretty simple since all the work is done
* elsewhere.
*/
virtual ~AsyncMessenger();
/** @defgroup Accessors
* @{
*/
void set_addr_unknowns(entity_addr_t& addr);
int get_dispatch_queue_len() {
return dispatch_queue.get_queue_len();
}
double get_dispatch_queue_max_age(utime_t now) {
return dispatch_queue.get_max_age(now);
}
/** @} Accessors */
/**
* @defgroup Configuration functions
* @{
*/
void set_cluster_protocol(int p) {
assert(!started && !did_bind);
cluster_protocol = p;
}
int bind(const entity_addr_t& bind_addr);
int rebind(const set<int>& avoid_ports);
/** @} Configuration functions */
/**
* @defgroup Startup/Shutdown
* @{
*/
int start() override;
void wait() override;
int shutdown() override;
/** @} // Startup/Shutdown */
/**
* @defgroup Messaging
* @{
*/
int send_message(Message *m, const entity_inst_t& dest) override {
Mutex::Locker l(lock);
return _send_message(m, dest);
}
/** @} // Messaging */
/**
* @defgroup Connection Management
* @{
*/
ConnectionRef get_connection(const entity_inst_t& dest) override;
ConnectionRef get_loopback_connection() override;
int send_keepalive(Connection *con);
virtual void mark_down(const entity_addr_t& addr) override;
virtual void mark_down_all() override {
shutdown_connections(true);
}
/** @} // Connection Management */
/**
* @defgroup Inner classes
* @{
*/
Connection *create_anon_connection();
/**
* @} // Inner classes
*/
protected:
/**
* @defgroup Messenger Interfaces
* @{
*/
/**
* Start up the DispatchQueue thread once we have somebody to dispatch to.
*/
void ready() override;
/** @} // Messenger Interfaces */
private:
/**
* @defgroup Utility functions
* @{
*/
/**
* Create a connection associated with the given entity (of the given type).
* Initiate the connection. (This function returning does not guarantee
* connection success.)
*
* @param addr The address of the entity to connect to.
* @param type The peer type of the entity at the address.
*
* @return a pointer to the newly-created connection. Caller does not own a
* reference; take one if you need it.
*/
AsyncConnectionRef create_connect(const entity_addr_t& addr, int type);
/**
* Queue up a Message for delivery to the entity specified
* by addr and dest_type.
* submit_message() is responsible for creating
* new AsyncConnection (and closing old ones) as necessary.
*
* @param m The Message to queue up. This function eats a reference.
* @param con The existing Connection to use, or NULL if you don't know of one.
* @param dest_addr The address to send the Message to.
* @param dest_type The peer type of the address we're sending to
* just drop silently under failure.
*/
void submit_message(Message *m, AsyncConnectionRef con,
const entity_addr_t& dest_addr, int dest_type);
int _send_message(Message *m, const entity_inst_t& dest);
private:
static const uint64_t ReapDeadConnectionThreshold = 5;
WorkerPool *pool;
Processor processor;
friend class Processor;
DispatchQueue dispatch_queue;
class C_handle_reap : public EventCallback {
AsyncMessenger *msgr;
public:
explicit C_handle_reap(AsyncMessenger *m): msgr(m) {}
void do_request(int id) {
// judge whether is a time event
msgr->reap_dead();
}
};
// the worker run messenger's cron jobs
Worker *local_worker;
/// overall lock used for AsyncMessenger data structures
Mutex lock;
// AsyncMessenger stuff
/// approximately unique ID set by the Constructor for use in entity_addr_t
uint64_t nonce;
/// true, specifying we haven't learned our addr; set false when we find it.
// maybe this should be protected by the lock?
bool need_addr;
/**
* The following aren't lock-protected since you shouldn't be able to race
* the only writers.
*/
/**
* false; set to true if the AsyncMessenger bound to a specific address;
* and set false again by Accepter::stop().
*/
bool did_bind;
/// counter for the global seq our connection protocol uses
__u32 global_seq;
/// lock to protect the global_seq
ceph_spinlock_t global_seq_lock;
/**
* hash map of addresses to Asyncconnection
*
* NOTE: a Asyncconnection* with state CLOSED may still be in the map but is considered
* invalid and can be replaced by anyone holding the msgr lock
*/
ceph::unordered_map<entity_addr_t, AsyncConnectionRef> conns;
/**
* list of connection are in teh process of accepting
*
* These are not yet in the conns map.
*/
set<AsyncConnectionRef> accepting_conns;
/**
* list of connection are closed which need to be clean up
*
* Because AsyncMessenger and AsyncConnection follow a lock rule that
* we can lock AsyncMesenger::lock firstly then lock AsyncConnection::lock
* but can't reversed. This rule is aimed to avoid dead lock.
* So if AsyncConnection want to unregister itself from AsyncMessenger,
* we pick up this idea that just queue itself to this set and do lazy
* deleted for AsyncConnection. "_lookup_conn" must ensure not return a
* AsyncConnection in this set.
*/
Mutex deleted_lock;
set<AsyncConnectionRef> deleted_conns;
EventCallbackRef reap_handler;
/// internal cluster protocol version, if any, for talking to entities of the same type.
int cluster_protocol;
Cond stop_cond;
bool stopped;
AsyncConnectionRef _lookup_conn(const entity_addr_t& k) {
assert(lock.is_locked());
ceph::unordered_map<entity_addr_t, AsyncConnectionRef>::iterator p = conns.find(k);
if (p == conns.end())
return NULL;
// lazy delete, see "deleted_conns"
Mutex::Locker l(deleted_lock);
if (deleted_conns.erase(p->second)) {
p->second->get_perf_counter()->dec(l_msgr_active_connections);
conns.erase(p);
return NULL;
}
return p->second;
}
void _init_local_connection() {
assert(lock.is_locked());
local_connection->peer_addr = my_inst.addr;
local_connection->peer_type = my_inst.name.type();
local_connection->set_features(local_features);
ms_deliver_handle_fast_connect(local_connection.get());
}
void shutdown_connections(bool queue_reset);
public:
/// con used for sending messages to ourselves
ConnectionRef local_connection;
uint64_t local_features;
/**
* @defgroup AsyncMessenger internals
* @{
*/
/**
* This wraps _lookup_conn.
*/
AsyncConnectionRef lookup_conn(const entity_addr_t& k) {
Mutex::Locker l(lock);
return _lookup_conn(k);
}
int accept_conn(AsyncConnectionRef conn) {
Mutex::Locker l(lock);
auto it = conns.find(conn->peer_addr);
if (it != conns.end()) {
AsyncConnectionRef existing = it->second;
// lazy delete, see "deleted_conns"
// If conn already in, we will return 0
Mutex::Locker l(deleted_lock);
if (deleted_conns.erase(existing)) {
} else if (conn != existing) {
return -1;
}
}
conns[conn->peer_addr] = conn;
conn->get_perf_counter()->inc(l_msgr_active_connections);
accepting_conns.erase(conn);
return 0;
}
void learned_addr(const entity_addr_t &peer_addr_for_me);
AsyncConnectionRef add_accept(int sd);
/**
* This wraps ms_deliver_get_authorizer. We use it for AsyncConnection.
*/
AuthAuthorizer *get_authorizer(int peer_type, bool force_new) {
return ms_deliver_get_authorizer(peer_type, force_new);
}
/**
* This wraps ms_deliver_verify_authorizer; we use it for AsyncConnection.
*/
bool verify_authorizer(Connection *con, int peer_type, int protocol, bufferlist& auth, bufferlist& auth_reply,
bool& isvalid, CryptoKey& session_key) {
return ms_deliver_verify_authorizer(con, peer_type, protocol, auth,
auth_reply, isvalid, session_key);
}
/**
* Increment the global sequence for this AsyncMessenger and return it.
* This is for the connect protocol, although it doesn't hurt if somebody
* else calls it.
*
* @return a global sequence ID that nobody else has seen.
*/
__u32 get_global_seq(__u32 old=0) {
ceph_spin_lock(&global_seq_lock);
if (old > global_seq)
global_seq = old;
__u32 ret = ++global_seq;
ceph_spin_unlock(&global_seq_lock);
return ret;
}
/**
* Get the protocol version we support for the given peer type: either
* a peer protocol (if it matches our own), the protocol version for the
* peer (if we're connecting), or our protocol version (if we're accepting).
*/
int get_proto_version(int peer_type, bool connect);
/**
* Fill in the address and peer type for the local connection, which
* is used for delivering messages back to ourself.
*/
void init_local_connection() {
Mutex::Locker l(lock);
_init_local_connection();
}
/**
* Unregister connection from `conns`
*
* See "deleted_conns"
*/
void unregister_conn(AsyncConnectionRef conn);
/**
* Reap dead connection from `deleted_conns`
*
* @return the number of dead connections
*
* See "deleted_conns"
*/
int reap_dead();
void release_worker(EventCenter* c);
/**
* @} // AsyncMessenger Internals
*/
} ;
#endif /* CEPH_ASYNCMESSENGER_H */