#define rpc_h
#include "types.h"
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include "thr_pool.h"
+#include "rpc_protocol.h"
+#include "thread_pool.h"
#include "marshall.h"
#include "marshall_wrap.h"
#include "connection.h"
+#include "threaded_log.h"
+
+using std::chrono::milliseconds;
namespace rpc {
static constexpr milliseconds to_max{12000};
static constexpr milliseconds to_min{100};
}
-class rpc_const {
- public:
- static const unsigned int bind = 1; // handler number reserved for bind
- static const int timeout_failure = -1;
- static const int unmarshal_args_failure = -2;
- static const int unmarshal_reply_failure = -3;
- static const int atmostonce_failure = -4;
- static const int oldsrv_failure = -5;
- static const int bind_failure = -6;
- static const int cancel_failure = -7;
-};
+template<class P, class R, class ...Args>
+struct is_valid_call : false_type {};
+
+template<class S, class R, class ...Args>
+struct is_valid_call<S(R &, Args...), R, Args...> : true_type {};
+
+template<class P, class F>
+struct is_valid_registration : false_type {};
+
+template<class S, class R, class ...Args>
+struct is_valid_registration<
+ S(R &, typename std::decay<Args>::type...),
+ S(R &, Args...)> : true_type {};
+
+template<class P, class C, class S, class R, class ...Args>
+struct is_valid_registration<
+ P,
+ S(C::*)(R &, Args...)> : is_valid_registration<P, S(R &, Args...)> {};
// rpc client endpoint.
// manages a xid space per destination socket
// threaded: multiple threads can be sending RPCs,
class rpcc : private connection_delegate {
private:
+ using proc_id_t = rpc_protocol::proc_id_t;
+ template <class S>
+ using proc_t = rpc_protocol::proc_t<S>;
+ using nonce_t = rpc_protocol::nonce_t;
+ using xid_t = rpc_protocol::xid_t;
// manages per rpc info
struct caller {
- caller(int _xid, string *_rep) : xid(_xid), rep(_rep) {}
+ caller(xid_t _xid, string *_rep) : xid(_xid), rep(_rep) {}
int xid;
string *rep;
int intret;
bool done = false;
- mutex m;
+ std::mutex m;
cond c;
};
- void get_refconn(shared_ptr<connection> & ch);
- void update_xid_rep(int xid);
+ void get_latest_connection(shared_ptr<connection> & ch);
+ void update_xid_rep(xid_t xid, lock & m_lock);
sockaddr_in dst_;
- unsigned int clt_nonce_;
- unsigned int srv_nonce_;
- bool bind_done_;
- int xid_;
- int lossytest_;
- bool retrans_;
- bool reachable_;
+ nonce_t clt_nonce_;
+ nonce_t srv_nonce_ = 0;
+ bool bind_done_ = false;
+ int lossytest_ = 0;
+ bool reachable_ = true;
shared_ptr<connection> chan_;
- mutex m_; // protect insert/delete to calls[]
- mutex chan_m_;
+ std::mutex m_; // protect insert/delete to calls[]
+ std::mutex chan_m_;
+ std::mutex bind_m_; // protect bind operations
- bool destroy_wait_;
+ bool destroy_wait_ = false;
cond destroy_wait_c_;
- map<int, caller *> calls_;
- list<int> xid_rep_window_;
+ std::map<int, caller *> calls_;
+
+ // xid starts with 1 and latest received reply starts with 0
+ xid_t xid_ = 1;
+ std::list<xid_t> xid_rep_window_ = {0};
struct request {
void clear() { buf.clear(); xid = -1; }
bool isvalid() { return xid != -1; }
string buf;
- int xid = -1;
+ xid_t xid = -1;
};
request dup_req_;
- int xid_rep_done_;
+ int xid_rep_done_ = -1;
- int call1(proc_t proc, marshall &req, string &rep, milliseconds to);
+ int call_marshalled(proc_id_t proc, milliseconds to, string & rep, marshall & req);
template<class R>
- int call_m(proc_t proc, marshall &req, R & r, milliseconds to) {
+ inline int call_m(proc_id_t proc, milliseconds to, R & r, marshall && req) {
string rep;
- int intret = call1(proc, req, rep, to);
- unmarshall u(rep, true);
- if (intret < 0) return intret;
- u >> r;
- if (u.okdone() != true) {
- cerr << "rpcc::call_m: failed to unmarshall the reply. You are probably " <<
- "calling RPC 0x" << hex << proc << " with the wrong return type." << endl;
- VERIFY(0);
- return rpc_const::unmarshal_reply_failure;
- }
+ int intret = call_marshalled(proc, to, rep, req);
+ if (intret >= 0)
+ VERIFY(unmarshall(rep, true, r).okdone()); // guaranteed by static type checking
return intret;
}
public:
- rpcc(const string & d, bool retrans=true);
+ rpcc(const string & d);
~rpcc();
- unsigned int id() { return clt_nonce_; }
-
int bind(milliseconds to = rpc::to_max);
+ // Manages a cache of RPC connections. Usage:
+ // if (auto cl = rpcc::bind_cached(dst))
+ // ret = cl->call(...);
+ // where the string dst has the form "host:port". Because bind_cached()
+ // may block, callers should probably not hold mutexes.
+ static shared_ptr<rpcc> bind_cached(const string & destination);
+ static void unbind_cached(const string & destination);
+
void set_reachable(bool r) { reachable_ = r; }
- void cancel();
+ void cancel(lock & m_lock);
- template<class R, typename ...Args>
- inline int call(proc_t proc, R & r, const Args&... args) {
+ template<class P, class R, typename ...Args>
+ inline int call(proc_t<P> proc, R & r, const Args & ... args) {
return call_timeout(proc, rpc::to_max, r, args...);
}
- template<class R, typename ...Args>
- inline int call_timeout(proc_t proc, milliseconds to, R & r, const Args&... args) {
- marshall m{args...};
- return call_m(proc, m, r, to);
+ template<class P, class R, typename ...Args>
+ inline int call_timeout(proc_t<P> proc, milliseconds to, R & r, const Args & ... args) {
+ static_assert(is_valid_call<P, R, Args...>::value, "RPC called with incorrect argument types");
+ return call_m(proc.id, to, r, std::forward<marshall>(marshall(args...)));
}
};
// rpc server endpoint.
class rpcs : private connection_delegate {
private:
+ using proc_id_t = rpc_protocol::proc_id_t;
+ template <class S>
+ using proc_t = rpc_protocol::proc_t<S>;
+ using nonce_t = rpc_protocol::nonce_t;
+ using xid_t = rpc_protocol::xid_t;
typedef enum {
NEW, // new RPC, not a duplicate
// has been sent; in that case buf points to a copy of the reply,
// and sz holds the size of the reply.
struct reply_t {
- reply_t (int _xid) : xid(_xid), cb_present(false) {}
- reply_t (int _xid, const string & _buf) : xid(_xid), cb_present(true), buf(_buf) {}
- int xid;
+ reply_t (xid_t _xid) : xid(_xid), cb_present(false) {}
+ reply_t (xid_t _xid, const string & _buf) : xid(_xid), cb_present(true), buf(_buf) {}
+ xid_t xid;
bool cb_present; // whether the reply buffer is valid
string buf; // the reply buffer
};
in_port_t port_;
- unsigned int nonce_;
+ nonce_t nonce_;
// provide at most once semantics by maintaining a window of replies
// per client that that client hasn't acknowledged receiving yet.
// indexed by client nonce.
- map<unsigned int, list<reply_t>> reply_window_;
+ std::map<nonce_t, std::list<reply_t>> reply_window_;
- void free_reply_window(void);
- void add_reply(unsigned int clt_nonce, int xid, const string & b);
+ void add_reply(nonce_t clt_nonce, xid_t xid, const string & b);
- rpcstate_t checkduplicate_and_update(unsigned int clt_nonce,
- int xid, int rep_xid, string & b);
-
- void updatestat(proc_t proc);
+ rpcstate_t check_duplicate_and_update(nonce_t clt_nonce, xid_t xid,
+ xid_t rep_xid, string & b);
// latest connection to the client
- map<unsigned int, shared_ptr<connection>> conns_;
-
- // counting
- const size_t counting_;
- size_t curr_counts_;
- map<proc_t, size_t> counts_;
+ std::map<nonce_t, shared_ptr<connection>> conns_;
- bool reachable_;
+ bool reachable_ = true;
// map proc # to function
- map<proc_t, handler *> procs_;
+ std::map<proc_id_t, handler *> procs_;
- mutex procs_m_; // protect insert/delete to procs[]
- mutex count_m_; // protect modification of counts
- mutex reply_window_m_; // protect reply window et al
- mutex conns_m_; // protect conns_
+ std::mutex procs_m_; // protect insert/delete to procs[]
+ std::mutex reply_window_m_; // protect reply window et al
+ std::mutex conns_m_; // protect conns_
void dispatch(shared_ptr<connection> c, const string & buf);
- // internal handler registration
- void reg1(proc_t proc, handler *);
-
- unique_ptr<thread_pool> dispatchpool_;
- unique_ptr<tcpsconn> listener_;
+ unique_ptr<thread_pool> dispatchpool_{new thread_pool(6)};
+ unique_ptr<connection_listener> listener_;
// RPC handler for clients binding
- int rpcbind(unsigned int &r, int a);
+ rpc_protocol::status rpcbind(nonce_t & r);
bool got_pdu(const shared_ptr<connection> & c, const string & b);
public:
- rpcs(in_port_t port, size_t counts=0);
+ rpcs(in_port_t port);
~rpcs();
void set_reachable(bool r) { reachable_ = r; }
- template<class F, class C=void> void reg(proc_t proc, F f, C *c=nullptr) {
+ template<class P, class F, class C=void> inline void reg(proc_t<P> proc, F f, C *c=nullptr) {
+ static_assert(is_valid_registration<P, F>::value, "RPC handler registered with incorrect argument types");
struct ReturnOnFailure {
static inline int unmarshall_args_failure() {
- return rpc_const::unmarshal_args_failure;
+ return rpc_protocol::unmarshall_args_failure;
}
};
- reg1(proc, marshalled_func<F, ReturnOnFailure>::wrap(f, c));
+ lock pl(procs_m_);
+ VERIFY(procs_.count(proc.id) == 0);
+ procs_[proc.id] = marshalled_func<F, ReturnOnFailure>::wrap(f, c);
+ VERIFY(procs_.count(proc.id) >= 1);
}
void start();
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