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statemachine_mcbp.cc
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/* -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright 2015 Couchbase, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "config.h"
#include "statemachine_mcbp.h"
#include "protocol/mcbp/engine_wrapper.h"
#include "memcached.h"
#include "mcbp.h"
#include "mcbp_executors.h"
#include "connections.h"
#include "sasl_tasks.h"
#include "runtime.h"
#include "mcaudit.h"
void McbpStateMachine::setCurrentTask(McbpConnection& connection, TaskFunction task) {
// Moving to the same state is legal
if (task == currentTask) {
return;
}
if (connection.isTAP() || connection.isDCP()) {
/*
* TAP and DCP connections behaves differently than normal
* connections because they operate in a full duplex mode.
* New messages may appear from both sides, so we can't block on
* read from the nework / engine
*/
if (task == conn_waiting) {
connection.setCurrentEvent(EV_WRITE);
task = conn_ship_log;
}
if (task == conn_read) {
// If we're starting to read data, reset any running timers
connection.setStart(0);
}
}
if (settings.getVerbose() > 2 || task == conn_closing
|| task == conn_setup_tap_stream) {
settings.extensions.logger->log(EXTENSION_LOG_DETAIL, this,
"%u: going from %s to %s\n",
connection.getId(),
getTaskName(currentTask),
getTaskName(task));
}
if (task == conn_write || task == conn_mwrite) {
if (connection.getStart() != 0) {
mcbp_collect_timings(&connection);
connection.setStart(0);
}
MEMCACHED_PROCESS_COMMAND_END(connection.getId(),
connection.write.buf,
connection.write.bytes);
}
currentTask = task;
}
const char* McbpStateMachine::getTaskName(TaskFunction task) const {
if (task == conn_new_cmd) {
return "conn_new_cmd";
} else if (task == conn_waiting) {
return "conn_waiting";
} else if (task == conn_read) {
return "conn_read";
} else if (task == conn_parse_cmd) {
return "conn_parse_cmd";
} else if (task == conn_write) {
return "conn_write";
} else if (task == conn_nread) {
return "conn_nread";
} else if (task == conn_closing) {
return "conn_closing";
} else if (task == conn_mwrite) {
return "conn_mwrite";
} else if (task == conn_ship_log) {
return "conn_ship_log";
} else if (task == conn_setup_tap_stream) {
return "conn_setup_tap_stream";
} else if (task == conn_pending_close) {
return "conn_pending_close";
} else if (task == conn_immediate_close) {
return "conn_immediate_close";
} else if (task == conn_refresh_cbsasl) {
return "conn_refresh_cbsasl";
} else if (task == conn_refresh_ssl_certs) {
return "conn_refresh_ssl_cert";
} else if (task == conn_flush) {
return "conn_flush";
} else if (task == conn_audit_configuring) {
return "conn_audit_configuring";
} else if (task == conn_create_bucket) {
return "conn_create_bucket";
} else if (task == conn_delete_bucket) {
return "conn_delete_bucket";
} else if (task == conn_sasl_auth) {
return "conn_sasl_auth";
} else if (task == conn_rbac_reload) {
return "conn_rbac_reload";
} else {
throw std::invalid_argument("Unknown task");
}
}
static void reset_cmd_handler(McbpConnection *c) {
c->setCmd(-1);
if(c->getItem() != nullptr) {
bucket_release_item(c, c->getItem());
c->setItem(nullptr);
}
c->getCookieObject().reset();
c->resetCommandContext();
if (c->read.bytes == 0) {
/* Make the whole read buffer available. */
c->read.curr = c->read.buf;
}
c->shrinkBuffers();
if (c->read.bytes > 0) {
c->setState(conn_parse_cmd);
} else {
c->setState(conn_waiting);
}
}
/**
* Ship tap log to the other end. This state differs with all other states
* in the way that it support full duplex dialog. We're listening to both read
* and write events from libevent most of the time. If a read event occurs we
* switch to the conn_read state to read and execute the input message (that would
* be an ack message from the other side). If a write event occurs we continue to
* send tap log to the other end.
* @param c the tap connection to drive
* @return true if we should continue to process work for this connection, false
* if we should start processing events for other connections.
*/
bool conn_ship_log(McbpConnection *c) {
if (is_bucket_dying(c)) {
return true;
}
bool cont = false;
short mask = EV_READ | EV_PERSIST | EV_WRITE;
if (c->isSocketClosed()) {
return false;
}
if (c->isReadEvent() || c->read.bytes > 0) {
if (c->read.bytes > 0) {
if (try_read_mcbp_command(c) == 0) {
c->setState(conn_read);
}
} else {
c->setState(conn_read);
}
/* we're going to process something.. let's proceed */
cont = true;
/* We have a finite number of messages in the input queue */
/* so let's process all of them instead of backing off after */
/* reading a subset of them. */
/* Why? Because we've got every time we're calling ship_tap_log */
/* we try to send a chunk of items.. This means that if we end */
/* up in a situation where we're receiving a burst of nack messages */
/* we'll only process a subset of messages in our input queue, */
/* and it will slowly grow.. */
c->setNumEvents(c->getMaxReqsPerEvent());
} else if (c->isWriteEvent()) {
if (c->decrementNumEvents() >= 0) {
c->setEwouldblock(false);
if (c->isDCP()) {
ship_mcbp_dcp_log(c);
} else {
ship_mcbp_tap_log(c);
}
if (c->isEwouldblock()) {
mask = EV_READ | EV_PERSIST;
} else {
cont = true;
}
}
}
if (!c->updateEvent(mask)) {
LOG_WARNING(c, "%u: conn_ship_log - Unable to update libevent "
"settings, closing connection (%p) %s", c->getId(),
c->getCookie(), c->getDescription().c_str());
c->setState(conn_closing);
}
return cont;
}
bool conn_waiting(McbpConnection *c) {
if (is_bucket_dying(c)) {
return true;
}
if (!c->updateEvent(EV_READ | EV_PERSIST)) {
LOG_WARNING(c, "%u: conn_waiting - Unable to update libevent "
"settings with (EV_READ | EV_PERSIST), closing connection "
"(%p) %s",
c->getId(), c->getCookie(), c->getDescription().c_str());
c->setState(conn_closing);
return true;
}
c->setState(conn_read);
return false;
}
bool conn_read(McbpConnection *c) {
if (is_bucket_dying(c)) {
return true;
}
switch (c->tryReadNetwork()) {
case McbpConnection::TryReadResult::NoDataReceived:
if (settings.isExitOnConnectionClose()) {
// No more data, proceed to close which will exit the process
c->setState(conn_closing);
} else {
c->setState(conn_waiting);
}
break;
case McbpConnection::TryReadResult::DataReceived:
c->setState(conn_parse_cmd);
break;
case McbpConnection::TryReadResult::SocketClosed:
case McbpConnection::TryReadResult::SocketError:
c->setState(conn_closing);
break;
case McbpConnection::TryReadResult::MemoryError: /* Failed to allocate more memory */
/* State already set by try_read_network */
break;
}
return true;
}
bool conn_parse_cmd(McbpConnection *c) {
if (try_read_mcbp_command(c) == 0) {
/* wee need more data! */
c->setState(conn_waiting);
}
return !c->isEwouldblock();
}
bool conn_new_cmd(McbpConnection *c) {
if (is_bucket_dying(c)) {
return true;
}
c->setStart(0);
/*
* In order to ensure that all clients will be served each
* connection will only process a certain number of operations
* before they will back off.
*/
if (c->decrementNumEvents() >= 0) {
reset_cmd_handler(c);
} else {
get_thread_stats(c)->conn_yields++;
/*
* If we've got data in the input buffer we might get "stuck"
* if we're waiting for a read event. Why? because we might
* already have all of the data for the next command in the
* userspace buffer so the client is idle waiting for the
* response to arrive. Lets set up a _write_ notification,
* since that'll most likely be true really soon.
*
* DCP and TAP connections is different from normal
* connections in the way that they may not even get data from
* the other end so that they'll _have_ to wait for a write event.
*/
if (c->havePendingInputData() || c->isDCP() || c->isTAP()) {
short flags = EV_WRITE | EV_PERSIST;
// pipe requires EV_READ forcing to ensure we can read until EOF
if (c->isPipeConnection()) {
flags |= EV_READ;
}
if (!c->updateEvent(flags)) {
LOG_WARNING(c, "%u: conn_new_cmd - Unable to update "
"libevent settings, closing connection (%p) %s",
c->getId(), c->getCookie(),
c->getDescription().c_str());
c->setState(conn_closing);
return true;
}
}
return false;
}
return true;
}
bool conn_nread(McbpConnection *c) {
if (is_bucket_dying(c)) {
return true;
}
ssize_t res;
if (c->getRlbytes() == 0) {
c->setEwouldblock(false);
bool block = false;
mcbp_complete_nread(c);
if (c->isEwouldblock()) {
c->unregisterEvent();
block = true;
}
return !block;
}
/* first check if we have leftovers in the conn_read buffer */
if (c->read.bytes > 0) {
uint32_t tocopy = c->read.bytes > c->getRlbytes() ? c->getRlbytes() : c->read.bytes;
if (c->getRitem() != c->read.curr) {
memmove(c->getRitem(), c->read.curr, tocopy);
}
c->setRitem(c->getRitem() + tocopy);
c->setRlbytes(c->getRlbytes() - tocopy);
c->read.curr += tocopy;
c->read.bytes -= tocopy;
if (c->getRlbytes() == 0) {
return true;
}
}
/* now try reading from the socket */
res = c->recv(c->getRitem(), c->getRlbytes());
auto error = GetLastNetworkError();
if (res > 0) {
get_thread_stats(c)->bytes_read += res;
if (c->read.curr == c->getRitem()) {
c->read.curr += res;
}
c->setRitem(c->getRitem() + res);
c->setRlbytes(c->getRlbytes() - res);
return true;
}
if (res == 0) { /* end of stream */
c->setState(conn_closing);
return true;
}
if (res == -1 && is_blocking(error)) {
if (!c->updateEvent(EV_READ | EV_PERSIST)) {
LOG_WARNING(c, "%u: conn_nread - Unable to update libevent "
"settings with (EV_READ | EV_PERSIST), closing "
"connection (%p) %s", c->getId(), c->getCookie(),
c->getDescription().c_str());
c->setState(conn_closing);
return true;
}
return false;
}
/* otherwise we have a real error, on which we close the connection */
if (!is_closed_conn(error)) {
LOG_WARNING(c,
"%u Failed to read, and not due to blocking:\n"
"errno: %d %s \n"
"rcurr=%lx ritem=%lx rbuf=%lx rlbytes=%d rsize=%d\n",
c->getId(), errno, strerror(errno),
(long)c->read.curr, (long)c->getRitem(), (long)c->read.buf,
(int)c->getRlbytes(), (int)c->read.size);
}
c->setState(conn_closing);
return true;
}
bool conn_write(McbpConnection *c) {
/*
* We want to write out a simple response. If we haven't already,
* assemble it into a msgbuf list (this will be a single-entry
* list for TCP).
*/
if (c->getIovUsed() == 0) {
c->addIov(c->write.curr, c->write.bytes);
}
return conn_mwrite(c);
}
bool conn_mwrite(McbpConnection *c) {
bool ret = true;
switch (c->transmit()) {
case McbpConnection::TransmitResult::Complete:
c->releaseTempAlloc();
if (c->getState() == conn_mwrite) {
c->releaseReservedItems();
} else if (c->getState() != conn_write) {
LOG_WARNING(c, "%u: Unexpected state %d, closing",
c->getId(), c->getState());
c->setState(conn_closing);
return true;
}
c->setState(c->getWriteAndGo());
break;
case McbpConnection::TransmitResult::Incomplete:
LOG_INFO(c, "%d - Incomplete transfer. Will retry", c->getId());
break;
case McbpConnection::TransmitResult::HardError:
LOG_NOTICE(c, "%d - Hard error, closing connection", c->getId());
break;
case McbpConnection::TransmitResult::SoftError:
ret = false;
break;
}
if (is_bucket_dying(c)) {
return true;
}
return ret;
}
bool conn_pending_close(McbpConnection *c) {
if (!c->isSocketClosed()) {
throw std::logic_error("conn_pending_close: socketDescriptor must be closed");
}
LOG_DEBUG(c,
"Awaiting clients to release the cookie (pending close for %p)",
(void*)c);
/*
* tell the tap connection that we're disconnecting it now,
* but give it a grace period
*/
perform_callbacks(ON_DISCONNECT, NULL, c->getCookie());
if (c->getRefcount() > 1) {
return false;
}
c->setState(conn_immediate_close);
return true;
}
bool conn_immediate_close(McbpConnection *c) {
ListeningPort *port_instance;
if (!c->isSocketClosed()) {
throw std::logic_error("conn_immediate_close: socketDescriptor must be closed");
}
LOG_DETAIL(c, "Releasing connection %p", c);
{
std::lock_guard<std::mutex> guard(stats_mutex);
port_instance = get_listening_port_instance(c->getParentPort());
if (port_instance) {
--port_instance->curr_conns;
} else if(!c->isPipeConnection()) {
throw std::logic_error("null port_instance and connection "
"is not a pipe");
}
}
perform_callbacks(ON_DISCONNECT, NULL, c->getCookie());
disassociate_bucket(c);
conn_close(c);
return false;
}
bool conn_closing(McbpConnection *c) {
// Delete any attached command context
c->resetCommandContext();
/* We don't want any network notifications anymore.. */
c->unregisterEvent();
safe_close(c->getSocketDescriptor());
c->setSocketDescriptor(INVALID_SOCKET);
/* engine::release any allocated state */
conn_cleanup_engine_allocations(c);
if (c->getRefcount() > 1 || c->isEwouldblock()) {
c->setState(conn_pending_close);
} else {
c->setState(conn_immediate_close);
}
return true;
}
/** sentinal state used to represent a 'destroyed' connection which will
* actually be freed at the end of the event loop. Always returns false.
*/
bool conn_destroyed(McbpConnection*) {
return false;
}
bool conn_refresh_cbsasl(McbpConnection *c) {
ENGINE_ERROR_CODE ret = c->getAiostat();
c->setAiostat(ENGINE_SUCCESS);
c->setEwouldblock(false);
if (ret == ENGINE_EWOULDBLOCK) {
LOG_WARNING(c,
"conn_refresh_cbsasl: Unexpected AIO stat result "
"EWOULDBLOCK. Shutting down connection");
c->setState(conn_closing);
return true;
}
ret = c->remapErrorCode(ret);
switch (ret) {
case ENGINE_SUCCESS:
mcbp_write_packet(c, PROTOCOL_BINARY_RESPONSE_SUCCESS);
break;
case ENGINE_DISCONNECT:
c->setState(conn_closing);
break;
default:
mcbp_write_packet(c, engine_error_2_mcbp_protocol_error(ret));
}
return true;
}
bool conn_refresh_ssl_certs(McbpConnection *c) {
ENGINE_ERROR_CODE ret = c->getAiostat();
c->setAiostat(ENGINE_SUCCESS);
c->setEwouldblock(false);
if (ret == ENGINE_EWOULDBLOCK) {
LOG_WARNING(c,
"conn_refresh_ssl_certs: Unexpected AIO stat result "
"EWOULDBLOCK. Shutting down connection");
c->setState(conn_closing);
return true;
}
ret = c->remapErrorCode(ret);
switch (ret) {
case ENGINE_SUCCESS:
mcbp_write_packet(c, PROTOCOL_BINARY_RESPONSE_SUCCESS);
break;
case ENGINE_DISCONNECT:
c->setState(conn_closing);
break;
default:
mcbp_write_packet(c, engine_error_2_mcbp_protocol_error(ret));
}
return true;
}
/**
* The conn_flush state in the state machinery means that we're currently
* running a slow (and blocking) flush. The connection is "suspended" in
* this state and when the connection is signalled this function is called
* which sends the response back to the client.
*
* @param c the connection to send the result back to (currently stored in
* c->aiostat).
* @return true to ensure that we continue to process events for this
* connection.
*/
bool conn_flush(McbpConnection *c) {
ENGINE_ERROR_CODE ret = c->getAiostat();
c->setAiostat(ENGINE_SUCCESS);
c->setEwouldblock(false);
ret = c->remapErrorCode(ret);
switch (ret) {
case ENGINE_SUCCESS:
mcbp_write_packet(c, PROTOCOL_BINARY_RESPONSE_SUCCESS);
break;
case ENGINE_DISCONNECT:
c->setState(conn_closing);
break;
default:
mcbp_write_packet(c, engine_error_2_mcbp_protocol_error(ret));
}
return true;
}
bool conn_audit_configuring(McbpConnection *c) {
ENGINE_ERROR_CODE ret = c->getAiostat();
c->setAiostat(ENGINE_SUCCESS);
c->setEwouldblock(false);
ret = c->remapErrorCode(ret);
switch (ret) {
case ENGINE_SUCCESS:
mcbp_write_packet(c, PROTOCOL_BINARY_RESPONSE_SUCCESS);
break;
case ENGINE_DISCONNECT:
c->setState(conn_closing);
break;
default:
LOG_WARNING(c,
"configuration of audit daemon failed with config file: %s",
settings.getAuditFile().c_str());
mcbp_write_packet(c, PROTOCOL_BINARY_RESPONSE_EINTERNAL);
}
return true;
}
bool conn_create_bucket(McbpConnection* c) {
ENGINE_ERROR_CODE ret = c->getAiostat();
c->setAiostat(ENGINE_SUCCESS);
c->setEwouldblock(false);
if (ret == ENGINE_EWOULDBLOCK) {
LOG_WARNING(c,
"conn_create_bucket: Unexpected AIO stat result "
"EWOULDBLOCK. Shutting down connection");
c->setState(conn_closing);
return true;
}
if (ret == ENGINE_DISCONNECT) {
c->setState(conn_closing);
} else {
mcbp_write_packet(c, engine_error_2_mcbp_protocol_error(ret));
}
return true;
}
bool conn_delete_bucket(McbpConnection *c) {
ENGINE_ERROR_CODE ret = c->getAiostat();
c->setAiostat(ENGINE_SUCCESS);
c->setEwouldblock(false);
if (ret == ENGINE_EWOULDBLOCK) {
LOG_WARNING(c,
"conn_delete_bucket: Unexpected AIO stat result "
"EWOULDBLOCK. Shutting down connection");
c->setState(conn_closing);
return true;
}
ret = c->remapErrorCode(ret);
if (ret == ENGINE_DISCONNECT) {
c->setState(conn_closing);
} else {
mcbp_write_packet(c, engine_error_2_mcbp_protocol_error(ret));
}
return true;
}
bool conn_sasl_auth(McbpConnection* c) {
c->setAiostat(ENGINE_SUCCESS);
c->setEwouldblock(false);
auto* ctx = reinterpret_cast<SaslCommandContext*>(c->getCommandContext());
auto task = reinterpret_cast<SaslAuthTask*>(ctx->task.get());
switch (task->getError()) {
case CBSASL_OK:
mcbp_write_response(
c, task->getResponse(), 0, 0, task->getResponse_length());
get_thread_stats(c)->auth_cmds++;
break;
case CBSASL_CONTINUE:
mcbp_add_header(c,
PROTOCOL_BINARY_RESPONSE_AUTH_CONTINUE,
0,
0,
task->getResponse_length(),
PROTOCOL_BINARY_RAW_BYTES);
c->addIov(task->getResponse(), task->getResponse_length());
c->setState(conn_mwrite);
c->setWriteAndGo(conn_new_cmd);
break;
case CBSASL_BADPARAM:
mcbp_write_packet(c, PROTOCOL_BINARY_RESPONSE_EINVAL);
{
auto* ts = get_thread_stats(c);
ts->auth_cmds++;
ts->auth_errors++;
}
break;
default:
if (!is_server_initialized()) {
auto ret = PROTOCOL_BINARY_RESPONSE_NOT_INITIALIZED;
if (!c->isXerrorSupport()) {
ret = PROTOCOL_BINARY_RESPONSE_AUTH_ERROR;
}
LOG_WARNING(c,
"%u: SASL AUTH failure during initialization. "
"UUID: [%s]",
c->getId(),
c->getCookieObject().getEventId().c_str());
mcbp_write_packet(c, ret);
c->setWriteAndGo(conn_closing);
return true;
}
if (task->getError() == CBSASL_NOUSER ||
task->getError() == CBSASL_PWERR) {
audit_auth_failure(c,
task->getError() == CBSASL_NOUSER
? "Unknown user"
: "Incorrect password");
}
mcbp_write_packet(c, PROTOCOL_BINARY_RESPONSE_AUTH_ERROR);
auto* ts = get_thread_stats(c);
ts->auth_cmds++;
ts->auth_errors++;
}
return true;
}
bool conn_rbac_reload(McbpConnection* c) {
ENGINE_ERROR_CODE ret = c->getAiostat();
c->setAiostat(ENGINE_SUCCESS);
c->setEwouldblock(false);
if (ret == ENGINE_EWOULDBLOCK) {
LOG_WARNING(c,
"conn_rbac_reload: Unexpected AIO stat result "
"EWOULDBLOCK. Shutting down connection");
c->setState(conn_closing);
return true;
}
if (ret == ENGINE_DISCONNECT) {
c->setState(conn_closing);
} else {
mcbp_write_packet(c, engine_error_2_mcbp_protocol_error(ret));
}
return true;
}