Cosmetic improvements.

[invirt/third/libt4.git] / rpc / connection.cc

diff --git a/rpc/connection.cc b/rpc/connection.cc
index fec7a4c..4e49305 100644 (file)
--- a/rpc/connection.cc
+++ b/rpc/connection.cc
@@ -1,440 +1,255 @@
-#include <fcntl.h>
-#include <sys/types.h>
-#include <sys/time.h>
+#include "connection.h"
+#include "rpc_protocol.h"
+#include <cerrno>
+#include <csignal>

 #include <netinet/tcp.h>
 #include <netinet/tcp.h>

-#include <errno.h>
-#include <signal.h>

 #include <unistd.h>
 #include <unistd.h>

+#include "marshall.h"

 
 

-#include "connection.h"
-#include "pollmgr.h"
-#include "jsl_log.h"
-#include "lang/verify.h"
-#include "lock.h"
-
-#define MAX_PDU (10<<20) //maximum PDF is 10M
-
-
-connection::connection(chanmgr *m1, int f1, int l1)
-: mgr_(m1), fd_(f1), dead_(false),waiters_(0), refno_(1),lossy_(l1)
+connection::connection(connection_delegate * delegate, socket_t && f1, int l1)
+: fd(move(f1)), delegate_(delegate), lossy_(l1)

 {
 {

-
-    int flags = fcntl(fd_, F_GETFL, NULL);
-    flags |= O_NONBLOCK;
-    fcntl(fd_, F_SETFL, flags);
+    fd.flags() |= O_NONBLOCK;

 
     signal(SIGPIPE, SIG_IGN);
 
 
     signal(SIGPIPE, SIG_IGN);
 

-    VERIFY(gettimeofday(&create_time_, NULL) == 0);
-
-    PollMgr::Instance()->add_callback(fd_, CB_RDONLY, this);
-}
-
-connection::~connection()
-{
-    VERIFY(dead_);
-    if (rpdu_.buf)
-        free(rpdu_.buf);
-    VERIFY(!wpdu_.buf);
-    close(fd_);
-}
-
-void
-connection::incref()
-{
-    lock rl(ref_m_);
-    refno_++;
-}
-
-bool
-connection::isdead()
-{
-    lock ml(m_);
-    return dead_;
+    poll_mgr::shared_mgr.add_callback(fd, CB_RDONLY, this);

 }
 
 }
 

-void
-connection::closeconn()
-{
+connection::~connection() {

     {
         lock ml(m_);
     {
         lock ml(m_);

-        if (!dead_) {
-            dead_ = true;
-            shutdown(fd_,SHUT_RDWR);
-        } else {
+        if (dead_)

             return;
             return;

-        }
+        dead_ = true;
+        shutdown(fd,SHUT_RDWR);

     }
     }

-    //after block_remove_fd, select will never wait on fd_
-    //and no callbacks will be active
-    PollMgr::Instance()->block_remove_fd(fd_);
+    // after block_remove_fd, select will never wait on fd and no callbacks
+    // will be active
+    poll_mgr::shared_mgr.block_remove_fd(fd);
+    VERIFY(dead_);
+    VERIFY(!wpdu_.buf.size());

 }
 
 }
 

-void
-connection::decref()
-{
-    bool dead = false;
-    {
-        lock rl(ref_m_);
-        refno_--;
-        VERIFY(refno_>=0);
-        if (refno_==0) {
-            lock ml(m_);
-            dead = dead_;
-        }
-    }
-    if (dead) {
-        delete this;
+shared_ptr<connection> connection::to_dst(const sockaddr_in & dst, connection_delegate * delegate, int lossy) {
+    socket_t s = socket(AF_INET, SOCK_STREAM, 0);
+    s.setsockopt(IPPROTO_TCP, TCP_NODELAY, (int)1);
+    if (connect(s, (sockaddr*)&dst, sizeof(dst)) < 0) {
+        IF_LEVEL(1) LOG_NONMEMBER("failed to " << inet_ntoa(dst.sin_addr) << ":" << ntoh(dst.sin_port));
+        close(s);
+        return nullptr;

     }
     }

+    IF_LEVEL(2) LOG_NONMEMBER("connection::to_dst fd=" << s << " to dst " << inet_ntoa(dst.sin_addr) << ":" << ntoh(dst.sin_port));
+    return make_shared<connection>(delegate, move(s), lossy);

 }
 
 }
 

-int
-connection::ref()
-{
-    lock rl(ref_m_);
-       return refno_;
-}
-
-int
-connection::compare(connection *another)
-{
-    if (create_time_.tv_sec > another->create_time_.tv_sec)
-        return 1;
-    if (create_time_.tv_sec < another->create_time_.tv_sec)
-        return -1;
-    if (create_time_.tv_usec > another->create_time_.tv_usec)
-        return 1;
-    if (create_time_.tv_usec < another->create_time_.tv_usec)
-        return -1;
-    return 0;
-}
-
-bool
-connection::send(char *b, int sz)
-{
+bool connection::send(const string & b) {

     lock ml(m_);
     lock ml(m_);

-       waiters_++;
-       while (!dead_ && wpdu_.buf) {
+
+    waiters_++;
+    while (!dead_ && wpdu_.buf.size())

         send_wait_.wait(ml);
         send_wait_.wait(ml);

-       }
-       waiters_--;
-       if (dead_) {
-               return false;
-       }
-       wpdu_.buf = b;
-       wpdu_.sz = sz;
-       wpdu_.solong = 0;
-
-       if (lossy_) {
-               if ((random()%100) < lossy_) {
-                       jsl_log(JSL_DBG_1, "connection::send LOSSY TEST shutdown fd_ %d\n", fd_);
-                       shutdown(fd_,SHUT_RDWR);
-               }
-       }
-
-       if (!writepdu()) {
-               dead_ = true;
+    waiters_--;
+
+    if (dead_)
+        return false;
+
+    wpdu_.buf = b;
+    wpdu_.solong = 0;
+
+    if (lossy_) {
+        if ((random()%100) < lossy_) {
+            IF_LEVEL(1) LOG("send LOSSY TEST shutdown fd " << fd);
+            shutdown(fd,SHUT_RDWR);
+        }
+    }
+
+    if (!writepdu()) {
+        dead_ = true;

         ml.unlock();
         ml.unlock();

-               PollMgr::Instance()->block_remove_fd(fd_);
+        poll_mgr::shared_mgr.block_remove_fd(fd);

         ml.lock();
         ml.lock();

-       }else{
-               if (wpdu_.solong == wpdu_.sz) {
-               }else{
-                       //should be rare to need to explicitly add write callback
-                       PollMgr::Instance()->add_callback(fd_, CB_WRONLY, this);
-                       while (!dead_ && wpdu_.solong >= 0 && wpdu_.solong < wpdu_.sz) {
-                send_complete_.wait(ml);
-                       }
-               }
-       }
-       bool ret = (!dead_ && wpdu_.solong == wpdu_.sz);
-       wpdu_.solong = wpdu_.sz = 0;
-       wpdu_.buf = NULL;
-       if (waiters_ > 0)
+    } else if (wpdu_.solong != wpdu_.buf.size()) {
+        // should be rare to need to explicitly add write callback
+        poll_mgr::shared_mgr.add_callback(fd, CB_WRONLY, this);
+        while (!dead_ && wpdu_.solong != size_t_max && wpdu_.solong < wpdu_.buf.size())
+            send_complete_.wait(ml);
+    }
+    bool ret = (!dead_ && wpdu_.solong == wpdu_.buf.size());
+    wpdu_.solong = 0;
+    wpdu_.buf.clear();
+    if (waiters_ > 0)

         send_wait_.notify_all();
         send_wait_.notify_all();

-       return ret;
+    return ret;

 }
 
 }
 

-//fd_ is ready to be written
-void
-connection::write_cb(int s)
-{
+// fd is ready to be written
+void connection::write_cb(int s) {

     lock ml(m_);
     lock ml(m_);

-       VERIFY(!dead_);
-       VERIFY(fd_ == s);
-       if (wpdu_.sz == 0) {
-               PollMgr::Instance()->del_callback(fd_,CB_WRONLY);
-               return;
-       }
-       if (!writepdu()) {
-               PollMgr::Instance()->del_callback(fd_, CB_RDWR);
-               dead_ = true;
-       } else {
-               VERIFY(wpdu_.solong >= 0);
-               if (wpdu_.solong < wpdu_.sz) {
-                       return;
-               }
+    VERIFY(!dead_);
+    VERIFY(fd == s);
+    if (wpdu_.buf.size() == 0) {
+        poll_mgr::shared_mgr.del_callback(fd, CB_WRONLY);
+        return;

     }
     }

-       send_complete_.notify_one();
+    if (!writepdu()) {
+        poll_mgr::shared_mgr.del_callback(fd, CB_RDWR);
+        dead_ = true;
+    } else {
+        VERIFY(wpdu_.solong != size_t_max);
+        if (wpdu_.solong < wpdu_.buf.size()) {
+            return;
+        }
+    }
+    send_complete_.notify_one();

 }
 
 }
 

-//fd_ is ready to be read
-void
-connection::read_cb(int s)
-{
+// fd is ready to be read
+void connection::read_cb(int s) {

     lock ml(m_);
     lock ml(m_);

-       VERIFY(fd_ == s);
-       if (dead_)  {
-               return;
-       }
-
-       bool succ = true;
-       if (!rpdu_.buf || rpdu_.solong < rpdu_.sz) {
-               succ = readpdu();
-       }
-
-       if (!succ) {
-               PollMgr::Instance()->del_callback(fd_,CB_RDWR);
-               dead_ = true;
-               send_complete_.notify_one();
-       }
-
-       if (rpdu_.buf && rpdu_.sz == rpdu_.solong) {
-               if (mgr_->got_pdu(this, rpdu_.buf, rpdu_.sz)) {
-                       //chanmgr has successfully consumed the pdu
-                       rpdu_.buf = NULL;
-                       rpdu_.sz = rpdu_.solong = 0;
-               }
-       }
-}
+    VERIFY(fd == s);
+    if (dead_)
+        return;

 
 

-bool
-connection::writepdu()
-{
-       VERIFY(wpdu_.solong >= 0);
-       if (wpdu_.solong == wpdu_.sz)
-               return true;
-
-       if (wpdu_.solong == 0) {
-               int sz = htonl(wpdu_.sz);
-               bcopy(&sz,wpdu_.buf,sizeof(sz));
-       }
-       int n = write(fd_, wpdu_.buf + wpdu_.solong, (wpdu_.sz-wpdu_.solong));
-       if (n < 0) {
-               if (errno != EAGAIN) {
-                       jsl_log(JSL_DBG_1, "connection::writepdu fd_ %d failure errno=%d\n", fd_, errno);
-                       wpdu_.solong = -1;
-                       wpdu_.sz = 0;
-               }
-               return (errno == EAGAIN);
-       }
-       wpdu_.solong += n;
-       return true;
-}
+    IF_LEVEL(5) LOG("got data on fd " << s);

 
 

-bool
-connection::readpdu()
-{
-       if (!rpdu_.sz) {
-               int sz, sz1;
-               int n = read(fd_, &sz1, sizeof(sz1));
-
-               if (n == 0) {
-                       return false;
-               }
-
-               if (n < 0) {
-                       VERIFY(errno!=EAGAIN);
-                       return false;
-               }
-
-               if (n >0 && n!= sizeof(sz)) {
-                       jsl_log(JSL_DBG_OFF, "connection::readpdu short read of sz\n");
-                       return false;
-               }
-
-               sz = ntohl(sz1);
-
-               if (sz > MAX_PDU) {
-                       char *tmpb = (char *)&sz1;
-                       jsl_log(JSL_DBG_2, "connection::readpdu read pdu TOO BIG %d network order=%x %x %x %x %x\n", sz,
-                                       sz1, tmpb[0],tmpb[1],tmpb[2],tmpb[3]);
-                       return false;
-               }
-
-               rpdu_.sz = sz;
-               VERIFY(rpdu_.buf == NULL);
-               rpdu_.buf = (char *)malloc(sz+sizeof(sz));
-               VERIFY(rpdu_.buf);
-               bcopy(&sz1,rpdu_.buf,sizeof(sz));
-               rpdu_.solong = sizeof(sz);
-       }
-
-       int n = read(fd_, rpdu_.buf + rpdu_.solong, rpdu_.sz - rpdu_.solong);
-       if (n <= 0) {
-               if (errno == EAGAIN)
-                       return true;
-               if (rpdu_.buf)
-                       free(rpdu_.buf);
-               rpdu_.buf = NULL;
-               rpdu_.sz = rpdu_.solong = 0;
-               return (errno == EAGAIN);
-       }
-       rpdu_.solong += n;
-       return true;
+    if (!rpdu_.buf.size() || rpdu_.solong < rpdu_.buf.size()) {
+        if (!readpdu()) {
+            IF_LEVEL(5) LOG("readpdu on fd " << s << " failed; dying");
+            poll_mgr::shared_mgr.del_callback(fd, CB_RDWR);
+            dead_ = true;
+            send_complete_.notify_one();
+        }
+    }
+
+    if (rpdu_.buf.size() && rpdu_.buf.size() == rpdu_.solong) {
+        if (delegate_->got_pdu(shared_from_this(), rpdu_.buf)) {
+            // connection_delegate has successfully consumed the pdu
+            rpdu_.buf.clear();
+            rpdu_.solong = 0;
+        }
+    }

 }
 
 }
 

-tcpsconn::tcpsconn(chanmgr *m1, int port, int lossytest)
-: mgr_(m1), lossy_(lossytest)
-{
-       struct sockaddr_in sin;
-       memset(&sin, 0, sizeof(sin));
-       sin.sin_family = AF_INET;
-       sin.sin_port = htons(port);
-
-       tcp_ = socket(AF_INET, SOCK_STREAM, 0);
-       if(tcp_ < 0){
-               perror("tcpsconn::tcpsconn accept_loop socket:");
-               VERIFY(0);
-       }
-
-       int yes = 1;
-       setsockopt(tcp_, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));
-       setsockopt(tcp_, IPPROTO_TCP, TCP_NODELAY, &yes, sizeof(yes));
-
-       if(bind(tcp_, (sockaddr *)&sin, sizeof(sin)) < 0){
-               perror("accept_loop tcp bind:");
-               VERIFY(0);
-       }
-
-       if(listen(tcp_, 1000) < 0) {
-               perror("tcpsconn::tcpsconn listen:");
-               VERIFY(0);
-       }
+bool connection::writepdu() {
+    VERIFY(wpdu_.solong != size_t_max);
+    if (wpdu_.solong == wpdu_.buf.size())
+        return true;

 
 

-    socklen_t addrlen = sizeof(sin);
-    VERIFY(getsockname(tcp_, (sockaddr *)&sin, &addrlen) == 0);
-    port_ = ntohs(sin.sin_port);
+    ssize_t n = write(fd, &wpdu_.buf[wpdu_.solong], (wpdu_.buf.size()-wpdu_.solong));
+    if (n < 0) {
+        if (errno != EAGAIN) {
+            IF_LEVEL(1) LOG("writepdu fd " << fd << " failure errno=" << errno);
+            wpdu_.solong = size_t_max;
+            wpdu_.buf.clear();
+        }
+        return (errno == EAGAIN);
+    }
+    wpdu_.solong += (size_t)n;
+    return true;
+}

 
 

-       jsl_log(JSL_DBG_2, "tcpsconn::tcpsconn listen on %d %d\n", port_,
-               sin.sin_port);
+bool connection::readpdu() {
+    IF_LEVEL(5) LOG("the receive buffer has length " << rpdu_.buf.size());
+    if (!rpdu_.buf.size()) {
+        rpc_protocol::rpc_sz_t sz1;
+        ssize_t n = fd.read(sz1);

 
 

-       if (pipe(pipe_) < 0) {
-               perror("accept_loop pipe:");
-               VERIFY(0);
-       }
+        if (n == 0)
+            return false;

 
 

-       int flags = fcntl(pipe_[0], F_GETFL, NULL);
-       flags |= O_NONBLOCK;
-       fcntl(pipe_[0], F_SETFL, flags);
+        if (n < 0) {
+            VERIFY(errno!=EAGAIN);
+            return false;
+        }

 
 

-    th_ = std::thread(&tcpsconn::accept_conn, this);
-}
+        if (n > 0 && n != sizeof(sz1)) {
+            IF_LEVEL(0) LOG("short read of sz");
+            return false;
+        }

 
 

-tcpsconn::~tcpsconn()
-{
-       VERIFY(close(pipe_[1]) == 0);
-    th_.join();
-
-       //close all the active connections
-       std::map<int, connection *>::iterator i;
-       for (i = conns_.begin(); i != conns_.end(); i++) {
-               i->second->closeconn();
-               i->second->decref();
-       }
-}
+        size_t sz = ntoh(sz1);

 
 

-void
-tcpsconn::process_accept()
-{
-       sockaddr_in sin;
-       socklen_t slen = sizeof(sin);
-       int s1 = accept(tcp_, (sockaddr *)&sin, &slen);
-       if (s1 < 0) {
-               perror("tcpsconn::accept_conn error");
-               throw thread_exit_exception();
-       }
-
-       jsl_log(JSL_DBG_2, "accept_loop got connection fd=%d %s:%d\n",
-                       s1, inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
-       connection *ch = new connection(mgr_, s1, lossy_);
-
-        // garbage collect all dead connections with refcount of 1
-        std::map<int, connection *>::iterator i;
-        for (i = conns_.begin(); i != conns_.end();) {
-                if (i->second->isdead() && i->second->ref() == 1) {
-                       jsl_log(JSL_DBG_2, "accept_loop garbage collected fd=%d\n",
-                                       i->second->channo());
-                        i->second->decref();
-                        // Careful not to reuse i right after erase. (i++) will
-                        // be evaluated before the erase call because in C++,
-                        // there is a sequence point before a function call.
-                        // See http://en.wikipedia.org/wiki/Sequence_point.
-                        conns_.erase(i++);
-                } else
-                        ++i;
+        if (sz > rpc_protocol::MAX_PDU) {
+            IF_LEVEL(2) LOG("read pdu TOO BIG " << sz << " network order=" << hex << sz1);
+            return false;

         }
 
         }
 

-       conns_[ch->channo()] = ch;
+        IF_LEVEL(5) LOG("read size of datagram = " << sz);
+
+        rpdu_.buf.assign(sz+sizeof(sz1), 0);
+        rpdu_.solong = sizeof(sz1);
+    }
+
+    ssize_t n = fd.read(&rpdu_.buf[rpdu_.solong], rpdu_.buf.size() - rpdu_.solong);
+
+    IF_LEVEL(5) LOG("read " << n << " bytes");
+
+    if (n <= 0) {
+        if (errno == EAGAIN)
+            return true;
+        rpdu_.buf.clear();
+        rpdu_.solong = 0;
+        return false;
+    }
+    rpdu_.solong += (size_t)n;
+    return true;

 }
 
 }
 

-void
-tcpsconn::accept_conn()
+connection_listener::connection_listener(connection_delegate * delegate, in_port_t port, int lossytest)
+: tcp_(socket(AF_INET, SOCK_STREAM, 0)), delegate_(delegate), lossy_(lossytest)

 {
 {

-       fd_set rfds;
-       int max_fd = pipe_[0] > tcp_ ? pipe_[0] : tcp_;
-
-    try {
-
-        while (1) {
-            FD_ZERO(&rfds);
-            FD_SET(pipe_[0], &rfds);
-            FD_SET(tcp_, &rfds);
-
-            int ret = select(max_fd+1, &rfds, NULL, NULL, NULL);
-
-            if (ret < 0) {
-                if (errno == EINTR) {
-                    continue;
-                } else {
-                    perror("accept_conn select:");
-                    jsl_log(JSL_DBG_OFF, "tcpsconn::accept_conn failure errno %d\n",errno);
-                    VERIFY(0);
-                }
-            }
-
-            if (FD_ISSET(pipe_[0], &rfds)) {
-                close(pipe_[0]);
-                close(tcp_);
-                return;
-            }
-            else if (FD_ISSET(tcp_, &rfds)) {
-                process_accept();
-            } else {
-                VERIFY(0);
-            }
-        }
+    tcp_.setsockopt(SOL_SOCKET, SO_REUSEADDR, (int)1);
+    tcp_.setsockopt(IPPROTO_TCP, TCP_NODELAY, (int)1);
+    tcp_.setsockopt(SOL_SOCKET, SO_RCVTIMEO, timeval{0, 50000});
+    tcp_.setsockopt(SOL_SOCKET, SO_SNDTIMEO, timeval{0, 50000});
+
+    sockaddr_in sin{}; // zero initialize
+    sin.sin_family = AF_INET;
+    sin.sin_port = hton(port);
+
+    if (bind(tcp_, (sockaddr *)&sin, sizeof(sin)) < 0) {
+        perror("accept_loop bind");
+        VERIFY(0);

     }
     }

-    catch (thread_exit_exception e)
-    {
-        return;
+
+    if (listen(tcp_, 1000) < 0) {
+        perror("accept_loop listen");
+        VERIFY(0);

     }
     }

+
+    socklen_t addrlen = sizeof(sin);
+    VERIFY(getsockname(tcp_, (sockaddr *)&sin, &addrlen) == 0);
+    port_ = ntoh(sin.sin_port);
+
+    IF_LEVEL(2) LOG("listen on " << port_ << " " << sin.sin_port);
+
+    poll_mgr::shared_mgr.add_callback(tcp_, CB_RDONLY, this);

 }
 
 }
 

-connection *
-connect_to_dst(const sockaddr_in &dst, chanmgr *mgr, int lossy)
-{
-       int s= socket(AF_INET, SOCK_STREAM, 0);
-       int yes = 1;
-       setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &yes, sizeof(yes));
-       if(connect(s, (sockaddr*)&dst, sizeof(dst)) < 0) {
-               jsl_log(JSL_DBG_1, "rpcc::connect_to_dst failed to %s:%d\n",
-                               inet_ntoa(dst.sin_addr), (int)ntohs(dst.sin_port));
-               close(s);
-               return NULL;
-       }
-       jsl_log(JSL_DBG_2, "connect_to_dst fd=%d to dst %s:%d\n",
-                       s, inet_ntoa(dst.sin_addr), (int)ntohs(dst.sin_port));
-       return new connection(mgr, s, lossy);
+connection_listener::~connection_listener() {
+    poll_mgr::shared_mgr.block_remove_fd(tcp_);

 }
 
 }
 

+void connection_listener::read_cb(int) {
+    sockaddr_in sin;
+    socklen_t slen = sizeof(sin);
+    int s1 = accept(tcp_, (sockaddr *)&sin, &slen);
+    if (s1 < 0) {
+        perror("connection_listener::accept_conn error");
+        throw thread_exit_exception();
+    }
+
+    IF_LEVEL(2) LOG("accept_loop got connection fd=" << s1 << " " << inet_ntoa(sin.sin_addr) << ":" << ntoh(sin.sin_port));
+    auto ch = make_shared<connection>(delegate_, s1, lossy_);
+
+    // garbage collect dead connections
+    for (auto i = conns_.begin(); i != conns_.end();) {
+        if (i->second->isdead())
+            conns_.erase(i++);
+        else
+            ++i;
+    }
+
+    conns_[s1] = ch;
+}