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authorAndrew Tridgell <tridge@samba.org>2007-01-19 03:54:48 +0000
committerGerald (Jerry) Carter <jerry@samba.org>2007-10-10 14:43:46 -0500
commit5cb78383fafa15c2ff7a4ccd194cccd5cf5cd263 (patch)
tree050e2f47faf234685cd7f20ab7e4f37e6521f7a2 /source4/cluster/ctdb/tcp
parent8c3d15f6caa3f1ffda86755fa9b7ff9602cbb022 (diff)
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r20889: import ctdb cluster backend from bzr
it will be interesting to see how the build farm handles this (This used to be commit 53be449630bd67d649a9e70cc7e25a9799c0616b)
Diffstat (limited to 'source4/cluster/ctdb/tcp')
-rw-r--r--source4/cluster/ctdb/tcp/ctdb_tcp.h76
-rw-r--r--source4/cluster/ctdb/tcp/tcp_connect.c191
-rw-r--r--source4/cluster/ctdb/tcp/tcp_init.c102
-rw-r--r--source4/cluster/ctdb/tcp/tcp_io.c254
4 files changed, 623 insertions, 0 deletions
diff --git a/source4/cluster/ctdb/tcp/ctdb_tcp.h b/source4/cluster/ctdb/tcp/ctdb_tcp.h
new file mode 100644
index 0000000000..0f8ce300b4
--- /dev/null
+++ b/source4/cluster/ctdb/tcp/ctdb_tcp.h
@@ -0,0 +1,76 @@
+/*
+ ctdb database library
+
+ Copyright (C) Andrew Tridgell 2006
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+
+/* ctdb_tcp main state */
+struct ctdb_tcp {
+ int listen_fd;
+};
+
+/*
+ incoming packet structure - only used when we get a partial packet
+ on read
+*/
+struct ctdb_tcp_partial {
+ uint8_t *data;
+ uint32_t length;
+};
+
+
+/*
+ state associated with an incoming connection
+*/
+struct ctdb_incoming {
+ struct ctdb_context *ctdb;
+ int fd;
+ struct ctdb_tcp_partial partial;
+};
+
+/*
+ outgoing packet structure - only allocated when we can't write immediately
+ to the socket
+*/
+struct ctdb_tcp_packet {
+ struct ctdb_tcp_packet *next, *prev;
+ uint8_t *data;
+ uint32_t length;
+};
+
+/*
+ state associated with one tcp node
+*/
+struct ctdb_tcp_node {
+ int fd;
+ struct fd_event *fde;
+ struct ctdb_tcp_packet *queue;
+};
+
+
+/* prototypes internal to tcp transport */
+void ctdb_tcp_node_write(struct event_context *ev, struct fd_event *fde,
+ uint16_t flags, void *private);
+void ctdb_tcp_incoming_read(struct event_context *ev, struct fd_event *fde,
+ uint16_t flags, void *private);
+int ctdb_tcp_queue_pkt(struct ctdb_node *node, uint8_t *data, uint32_t length);
+int ctdb_tcp_listen(struct ctdb_context *ctdb);
+void ctdb_tcp_node_connect(struct event_context *ev, struct timed_event *te,
+ struct timeval t, void *private);
+
+#define CTDB_TCP_ALIGNMENT 8
diff --git a/source4/cluster/ctdb/tcp/tcp_connect.c b/source4/cluster/ctdb/tcp/tcp_connect.c
new file mode 100644
index 0000000000..2404144ac1
--- /dev/null
+++ b/source4/cluster/ctdb/tcp/tcp_connect.c
@@ -0,0 +1,191 @@
+/*
+ ctdb over TCP
+
+ Copyright (C) Andrew Tridgell 2006
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include "includes.h"
+#include "lib/events/events.h"
+#include "lib/tdb/include/tdb.h"
+#include "system/network.h"
+#include "system/filesys.h"
+#include "cluster/ctdb/include/ctdb_private.h"
+#include "ctdb_tcp.h"
+
+static void set_nonblocking(int fd)
+{
+ unsigned v;
+ v = fcntl(fd, F_GETFL, 0);
+ fcntl(fd, F_SETFL, v | O_NONBLOCK);
+}
+
+
+/*
+ called when socket becomes writeable on connect
+*/
+static void ctdb_node_connect_write(struct event_context *ev, struct fd_event *fde,
+ uint16_t flags, void *private)
+{
+ struct ctdb_node *node = talloc_get_type(private, struct ctdb_node);
+ struct ctdb_tcp_node *tnode = talloc_get_type(node->private,
+ struct ctdb_tcp_node);
+ struct ctdb_context *ctdb = node->ctdb;
+ int error = 0;
+ socklen_t len = sizeof(error);
+
+ if (getsockopt(tnode->fd, SOL_SOCKET, SO_ERROR, &error, &len) != 0 ||
+ error != 0) {
+ talloc_free(fde);
+ close(tnode->fd);
+ tnode->fd = -1;
+ event_add_timed(ctdb->ev, node, timeval_current_ofs(1, 0),
+ ctdb_tcp_node_connect, node);
+ return;
+ }
+
+ talloc_free(fde);
+ tnode->fde = event_add_fd(node->ctdb->ev, node, tnode->fd, EVENT_FD_READ,
+ ctdb_tcp_node_write, node);
+
+ /* tell the ctdb layer we are connected */
+ node->ctdb->upcalls->node_connected(node);
+
+ if (tnode->queue) {
+ EVENT_FD_WRITEABLE(tnode->fde);
+ }
+}
+
+/*
+ called when we should try and establish a tcp connection to a node
+*/
+void ctdb_tcp_node_connect(struct event_context *ev, struct timed_event *te,
+ struct timeval t, void *private)
+{
+ struct ctdb_node *node = talloc_get_type(private, struct ctdb_node);
+ struct ctdb_tcp_node *tnode = talloc_get_type(node->private,
+ struct ctdb_tcp_node);
+ struct ctdb_context *ctdb = node->ctdb;
+ struct sockaddr_in sock_out;
+
+ tnode->fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+
+ set_nonblocking(tnode->fd);
+
+ inet_pton(AF_INET, node->address.address, &sock_out.sin_addr);
+ sock_out.sin_port = htons(node->address.port);
+ sock_out.sin_family = PF_INET;
+
+ if (connect(tnode->fd, (struct sockaddr *)&sock_out, sizeof(sock_out)) != 0 &&
+ errno != EINPROGRESS) {
+ /* try again once a second */
+ close(tnode->fd);
+ event_add_timed(ctdb->ev, node, timeval_current_ofs(1, 0),
+ ctdb_tcp_node_connect, node);
+ return;
+ }
+
+ /* non-blocking connect - wait for write event */
+ event_add_fd(node->ctdb->ev, node, tnode->fd, EVENT_FD_WRITE|EVENT_FD_READ,
+ ctdb_node_connect_write, node);
+}
+
+/*
+ destroy a ctdb_incoming structure
+*/
+static int ctdb_incoming_destructor(struct ctdb_incoming *in)
+{
+ close(in->fd);
+ in->fd = -1;
+ return 0;
+}
+
+/*
+ called when we get contacted by another node
+ currently makes no attempt to check if the connection is really from a ctdb
+ node in our cluster
+*/
+static void ctdb_listen_event(struct event_context *ev, struct fd_event *fde,
+ uint16_t flags, void *private)
+{
+ struct ctdb_context *ctdb;
+ struct ctdb_tcp *ctcp;
+ struct sockaddr_in addr;
+ socklen_t len;
+ int fd;
+ struct ctdb_incoming *in;
+
+ ctdb = talloc_get_type(private, struct ctdb_context);
+ ctcp = talloc_get_type(ctdb->private, struct ctdb_tcp);
+ memset(&addr, 0, sizeof(addr));
+ len = sizeof(addr);
+ fd = accept(ctcp->listen_fd, (struct sockaddr *)&addr, &len);
+ if (fd == -1) return;
+
+ in = talloc_zero(ctdb, struct ctdb_incoming);
+ in->fd = fd;
+ in->ctdb = ctdb;
+
+ set_nonblocking(in->fd);
+
+ event_add_fd(ctdb->ev, in, in->fd, EVENT_FD_READ,
+ ctdb_tcp_incoming_read, in);
+
+ talloc_set_destructor(in, ctdb_incoming_destructor);
+}
+
+
+/*
+ listen on our own address
+*/
+int ctdb_tcp_listen(struct ctdb_context *ctdb)
+{
+ struct ctdb_tcp *ctcp = talloc_get_type(ctdb->private, struct ctdb_tcp);
+ struct sockaddr_in sock;
+ int one = 1;
+
+ sock.sin_port = htons(ctdb->address.port);
+ sock.sin_family = PF_INET;
+ inet_pton(AF_INET, ctdb->address.address, &sock.sin_addr);
+
+ ctcp->listen_fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+ if (ctcp->listen_fd == -1) {
+ ctdb_set_error(ctdb, "socket failed\n");
+ return -1;
+ }
+
+ setsockopt(ctcp->listen_fd,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one));
+
+ if (bind(ctcp->listen_fd, (struct sockaddr * )&sock, sizeof(sock)) != 0) {
+ ctdb_set_error(ctdb, "bind failed\n");
+ close(ctcp->listen_fd);
+ ctcp->listen_fd = -1;
+ return -1;
+ }
+
+ if (listen(ctcp->listen_fd, 10) == -1) {
+ ctdb_set_error(ctdb, "listen failed\n");
+ close(ctcp->listen_fd);
+ ctcp->listen_fd = -1;
+ return -1;
+ }
+
+ event_add_fd(ctdb->ev, ctdb, ctcp->listen_fd, EVENT_FD_READ,
+ ctdb_listen_event, ctdb);
+
+ return 0;
+}
+
diff --git a/source4/cluster/ctdb/tcp/tcp_init.c b/source4/cluster/ctdb/tcp/tcp_init.c
new file mode 100644
index 0000000000..b8ee8cb30e
--- /dev/null
+++ b/source4/cluster/ctdb/tcp/tcp_init.c
@@ -0,0 +1,102 @@
+/*
+ ctdb over TCP
+
+ Copyright (C) Andrew Tridgell 2006
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include "includes.h"
+#include "lib/tdb/include/tdb.h"
+#include "lib/events/events.h"
+#include "system/network.h"
+#include "system/filesys.h"
+#include "cluster/ctdb/include/ctdb_private.h"
+#include "ctdb_tcp.h"
+
+/*
+ start the protocol going
+*/
+int ctdb_tcp_start(struct ctdb_context *ctdb)
+{
+ int i;
+
+ /* listen on our own address */
+ if (ctdb_tcp_listen(ctdb) != 0) return -1;
+
+ /* startup connections to the other servers - will happen on
+ next event loop */
+ for (i=0;i<ctdb->num_nodes;i++) {
+ struct ctdb_node *node = *(ctdb->nodes + i);
+ if (!(ctdb->flags & CTDB_FLAG_SELF_CONNECT) &&
+ ctdb_same_address(&ctdb->address, &node->address)) continue;
+ event_add_timed(ctdb->ev, node, timeval_zero(),
+ ctdb_tcp_node_connect, node);
+ }
+
+ return 0;
+}
+
+
+/*
+ initialise tcp portion of a ctdb node
+*/
+int ctdb_tcp_add_node(struct ctdb_node *node)
+{
+ struct ctdb_tcp_node *tnode;
+ tnode = talloc_zero(node, struct ctdb_tcp_node);
+ CTDB_NO_MEMORY(node->ctdb, tnode);
+
+ tnode->fd = -1;
+ node->private = tnode;
+ return 0;
+}
+
+
+/*
+ transport packet allocator - allows transport to control memory for packets
+*/
+void *ctdb_tcp_allocate_pkt(struct ctdb_context *ctdb, size_t size)
+{
+ /* tcp transport needs to round to 8 byte alignment to ensure
+ that we can use a length header and 64 bit elements in
+ structures */
+ size = (size+(CTDB_TCP_ALIGNMENT-1)) & ~(CTDB_TCP_ALIGNMENT-1);
+ return talloc_size(ctdb, size);
+}
+
+
+static const struct ctdb_methods ctdb_tcp_methods = {
+ .start = ctdb_tcp_start,
+ .add_node = ctdb_tcp_add_node,
+ .queue_pkt = ctdb_tcp_queue_pkt,
+ .allocate_pkt = ctdb_tcp_allocate_pkt
+};
+
+/*
+ initialise tcp portion of ctdb
+*/
+int ctdb_tcp_init(struct ctdb_context *ctdb)
+{
+ struct ctdb_tcp *ctcp;
+ ctcp = talloc_zero(ctdb, struct ctdb_tcp);
+ CTDB_NO_MEMORY(ctdb, ctcp);
+
+ ctcp->listen_fd = -1;
+ ctdb->private = ctcp;
+ ctdb->methods = &ctdb_tcp_methods;
+ return 0;
+}
+
diff --git a/source4/cluster/ctdb/tcp/tcp_io.c b/source4/cluster/ctdb/tcp/tcp_io.c
new file mode 100644
index 0000000000..82e24f7260
--- /dev/null
+++ b/source4/cluster/ctdb/tcp/tcp_io.c
@@ -0,0 +1,254 @@
+/*
+ ctdb over TCP
+
+ Copyright (C) Andrew Tridgell 2006
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2 of the License, or (at your option) any later version.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include "includes.h"
+#include "lib/events/events.h"
+#include "lib/util/dlinklist.h"
+#include "lib/tdb/include/tdb.h"
+#include "system/network.h"
+#include "system/filesys.h"
+#include "cluster/ctdb/include/ctdb_private.h"
+#include "ctdb_tcp.h"
+
+
+/*
+ called when we fail to send a message to a node
+*/
+static void ctdb_tcp_node_dead(struct event_context *ev, struct timed_event *te,
+ struct timeval t, void *private)
+{
+ struct ctdb_node *node = talloc_get_type(private, struct ctdb_node);
+ struct ctdb_tcp_node *tnode = talloc_get_type(node->private,
+ struct ctdb_tcp_node);
+
+ /* flush the queue */
+ while (tnode->queue) {
+ struct ctdb_tcp_packet *pkt = tnode->queue;
+ DLIST_REMOVE(tnode->queue, pkt);
+ talloc_free(pkt);
+ }
+
+ /* start a new connect cycle to try to re-establish the
+ link */
+ talloc_free(tnode->fde);
+ close(tnode->fd);
+ tnode->fd = -1;
+ event_add_timed(node->ctdb->ev, node, timeval_zero(),
+ ctdb_tcp_node_connect, node);
+}
+
+/*
+ called when socket becomes readable
+*/
+void ctdb_tcp_node_write(struct event_context *ev, struct fd_event *fde,
+ uint16_t flags, void *private)
+{
+ struct ctdb_node *node = talloc_get_type(private, struct ctdb_node);
+ struct ctdb_tcp_node *tnode = talloc_get_type(node->private,
+ struct ctdb_tcp_node);
+ if (flags & EVENT_FD_READ) {
+ /* getting a read event on this fd in the current tcp model is
+ always an error, as we have separate read and write
+ sockets. In future we may combine them, but for now it must
+ mean that the socket is dead, so we try to reconnect */
+ talloc_free(tnode->fde);
+ close(tnode->fd);
+ tnode->fd = -1;
+ event_add_timed(node->ctdb->ev, node, timeval_zero(),
+ ctdb_tcp_node_connect, node);
+ return;
+ }
+
+ while (tnode->queue) {
+ struct ctdb_tcp_packet *pkt = tnode->queue;
+ ssize_t n;
+
+ n = write(tnode->fd, pkt->data, pkt->length);
+
+ if (n == -1 && errno != EAGAIN && errno != EWOULDBLOCK) {
+ event_add_timed(node->ctdb->ev, node, timeval_zero(),
+ ctdb_tcp_node_dead, node);
+ EVENT_FD_NOT_WRITEABLE(tnode->fde);
+ return;
+ }
+ if (n <= 0) return;
+
+ if (n != pkt->length) {
+ pkt->length -= n;
+ pkt->data += n;
+ return;
+ }
+
+ DLIST_REMOVE(tnode->queue, pkt);
+ talloc_free(pkt);
+ }
+
+ EVENT_FD_NOT_WRITEABLE(tnode->fde);
+}
+
+
+/*
+ called when an incoming connection is readable
+*/
+void ctdb_tcp_incoming_read(struct event_context *ev, struct fd_event *fde,
+ uint16_t flags, void *private)
+{
+ struct ctdb_incoming *in = talloc_get_type(private, struct ctdb_incoming);
+ int num_ready = 0;
+ ssize_t nread;
+ uint8_t *data, *data_base;
+
+ if (ioctl(in->fd, FIONREAD, &num_ready) != 0 ||
+ num_ready == 0) {
+ /* we've lost the link from another node. We don't
+ notify the upper layers, as we only want to trigger
+ a full node reorganisation when a send fails - that
+ allows nodes to restart without penalty as long as
+ the network is idle */
+ talloc_free(in);
+ return;
+ }
+
+ in->partial.data = talloc_realloc_size(in, in->partial.data,
+ num_ready + in->partial.length);
+ if (in->partial.data == NULL) {
+ /* not much we can do except drop the socket */
+ talloc_free(in);
+ return;
+ }
+
+ nread = read(in->fd, in->partial.data+in->partial.length, num_ready);
+ if (nread <= 0) {
+ /* the connection must be dead */
+ talloc_free(in);
+ return;
+ }
+
+ data = in->partial.data;
+ nread += in->partial.length;
+
+ in->partial.data = NULL;
+ in->partial.length = 0;
+
+ if (nread >= 4 && *(uint32_t *)data == nread) {
+ /* most common case - we got a whole packet in one go
+ tell the ctdb layer above that we have a packet */
+ in->ctdb->upcalls->recv_pkt(in->ctdb, data, nread);
+ return;
+ }
+
+ data_base = data;
+
+ while (nread >= 4 && *(uint32_t *)data <= nread) {
+ /* we have at least one packet */
+ uint8_t *d2;
+ uint32_t len;
+ len = *(uint32_t *)data;
+ d2 = talloc_memdup(in, data, len);
+ if (d2 == NULL) {
+ /* sigh */
+ talloc_free(in);
+ return;
+ }
+ in->ctdb->upcalls->recv_pkt(in->ctdb, d2, len);
+ data += len;
+ nread -= len;
+ return;
+ }
+
+ if (nread < 4 || *(uint32_t *)data > nread) {
+ /* we have only part of a packet */
+ if (data_base == data) {
+ in->partial.data = data;
+ in->partial.length = nread;
+ } else {
+ in->partial.data = talloc_memdup(in, data, nread);
+ if (in->partial.data == NULL) {
+ talloc_free(in);
+ return;
+ }
+ in->partial.length = nread;
+ talloc_free(data_base);
+ }
+ return;
+ }
+
+ talloc_free(data_base);
+}
+
+/*
+ queue a packet for sending
+*/
+int ctdb_tcp_queue_pkt(struct ctdb_node *node, uint8_t *data, uint32_t length)
+{
+ struct ctdb_tcp_node *tnode = talloc_get_type(node->private,
+ struct ctdb_tcp_node);
+ struct ctdb_tcp_packet *pkt;
+ uint32_t length2;
+
+ /* enforce the length and alignment rules from the tcp packet allocator */
+ length2 = (length+(CTDB_TCP_ALIGNMENT-1)) & ~(CTDB_TCP_ALIGNMENT-1);
+ *(uint32_t *)data = length2;
+
+ if (length2 != length) {
+ memset(data+length, 0, length2-length);
+ }
+ {
+ int i, fd = open("/dev/null", O_WRONLY);
+ for (i=0;i<length2;i++) {
+ write(fd, &data[i], 1);
+ }
+ close(fd);
+ }
+
+ /* if the queue is empty then try an immediate write, avoiding
+ queue overhead. This relies on non-blocking sockets */
+ if (tnode->queue == NULL && tnode->fd != -1) {
+ ssize_t n = write(tnode->fd, data, length2);
+ if (n == -1 && errno != EAGAIN && errno != EWOULDBLOCK) {
+ event_add_timed(node->ctdb->ev, node, timeval_zero(),
+ ctdb_tcp_node_dead, node);
+ /* yes, we report success, as the dead node is
+ handled via a separate event */
+ return 0;
+ }
+ if (n > 0) {
+ data += n;
+ length2 -= n;
+ }
+ if (length2 == 0) return 0;
+ }
+
+ pkt = talloc(tnode, struct ctdb_tcp_packet);
+ CTDB_NO_MEMORY(node->ctdb, pkt);
+
+ pkt->data = talloc_memdup(pkt, data, length2);
+ CTDB_NO_MEMORY(node->ctdb, pkt->data);
+
+ pkt->length = length2;
+
+ if (tnode->queue == NULL && tnode->fd != -1) {
+ EVENT_FD_WRITEABLE(tnode->fde);
+ }
+
+ DLIST_ADD_END(tnode->queue, pkt, struct ctdb_tcp_packet *);
+
+ return 0;
+}