2017-06-15 13:16:16 +00:00
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package pool
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2013-12-09 20:09:57 +00:00
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import (
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2014-05-27 21:33:09 +00:00
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"container/list"
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2019-08-12 16:47:02 +00:00
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"crypto/tls"
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2013-12-24 20:22:42 +00:00
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"fmt"
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2014-05-28 23:32:10 +00:00
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"io"
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2013-12-09 20:09:57 +00:00
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"net"
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2013-12-09 22:52:22 +00:00
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"net/rpc"
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2013-12-09 20:09:57 +00:00
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"sync"
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2014-02-06 00:19:05 +00:00
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"sync/atomic"
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2013-12-09 20:09:57 +00:00
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"time"
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2014-10-02 17:26:25 +00:00
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2020-02-07 21:50:24 +00:00
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"github.com/hashicorp/consul/agent/structs"
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2017-10-10 22:19:50 +00:00
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"github.com/hashicorp/consul/lib"
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2014-11-18 16:03:36 +00:00
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"github.com/hashicorp/consul/tlsutil"
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2020-02-07 21:50:24 +00:00
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msgpackrpc "github.com/hashicorp/net-rpc-msgpackrpc"
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2014-10-02 17:26:25 +00:00
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"github.com/hashicorp/yamux"
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2013-12-09 20:09:57 +00:00
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)
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2017-03-15 15:02:14 +00:00
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const defaultDialTimeout = 10 * time.Second
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2016-08-10 01:10:04 +00:00
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// muxSession is used to provide an interface for a stream multiplexer.
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2014-05-27 21:33:09 +00:00
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type muxSession interface {
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Open() (net.Conn, error)
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Close() error
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}
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// streamClient is used to wrap a stream with an RPC client
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type StreamClient struct {
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stream net.Conn
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2015-10-13 23:43:52 +00:00
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codec rpc.ClientCodec
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2014-05-27 21:33:09 +00:00
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}
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2015-04-07 21:17:20 +00:00
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func (sc *StreamClient) Close() {
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sc.stream.Close()
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2015-10-13 23:43:52 +00:00
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sc.codec.Close()
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2015-04-07 21:17:20 +00:00
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}
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2013-12-09 20:09:57 +00:00
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// Conn is a pooled connection to a Consul server
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type Conn struct {
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2014-05-28 23:55:39 +00:00
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refCount int32
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shouldClose int32
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2020-03-09 20:59:02 +00:00
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nodeName string
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2017-03-15 16:06:21 +00:00
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addr net.Addr
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2014-05-27 21:33:09 +00:00
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session muxSession
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2013-12-19 23:42:17 +00:00
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lastUsed time.Time
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2014-05-27 21:33:09 +00:00
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pool *ConnPool
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clients *list.List
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clientLock sync.Mutex
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2013-12-09 20:09:57 +00:00
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}
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2013-12-09 22:58:49 +00:00
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func (c *Conn) Close() error {
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2014-02-06 00:19:05 +00:00
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return c.session.Close()
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2013-12-09 22:58:49 +00:00
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}
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2014-05-27 21:33:09 +00:00
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// getClient is used to get a cached or new client
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func (c *Conn) getClient() (*StreamClient, error) {
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// Check for cached client
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c.clientLock.Lock()
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front := c.clients.Front()
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if front != nil {
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c.clients.Remove(front)
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}
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c.clientLock.Unlock()
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if front != nil {
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return front.Value.(*StreamClient), nil
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}
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// Open a new session
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stream, err := c.session.Open()
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if err != nil {
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return nil, err
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}
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// Create the RPC client
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2020-02-07 21:50:24 +00:00
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codec := msgpackrpc.NewCodecFromHandle(true, true, stream, structs.MsgpackHandle)
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2014-05-27 21:33:09 +00:00
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// Return a new stream client
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sc := &StreamClient{
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stream: stream,
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2015-10-13 23:43:52 +00:00
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codec: codec,
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2014-05-27 21:33:09 +00:00
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}
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return sc, nil
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}
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// returnStream is used when done with a stream
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// to allow re-use by a future RPC
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func (c *Conn) returnClient(client *StreamClient) {
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didSave := false
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c.clientLock.Lock()
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2017-06-15 13:16:16 +00:00
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if c.clients.Len() < c.pool.MaxStreams && atomic.LoadInt32(&c.shouldClose) == 0 {
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2014-05-27 21:33:09 +00:00
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c.clients.PushFront(client)
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didSave = true
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2015-11-28 01:20:57 +00:00
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// If this is a Yamux stream, shrink the internal buffers so that
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// we can GC the idle memory
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if ys, ok := client.stream.(*yamux.Stream); ok {
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ys.Shrink()
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}
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2014-05-27 21:33:09 +00:00
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}
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c.clientLock.Unlock()
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if !didSave {
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2015-04-07 21:17:20 +00:00
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client.Close()
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2014-05-27 21:33:09 +00:00
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}
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}
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2015-08-13 17:01:05 +00:00
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// markForUse does all the bookkeeping required to ready a connection for use.
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func (c *Conn) markForUse() {
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c.lastUsed = time.Now()
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atomic.AddInt32(&c.refCount, 1)
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}
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2017-06-15 13:16:16 +00:00
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// ConnPool is used to maintain a connection pool to other Consul
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// servers. This is used to reduce the latency of RPC requests between
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// servers. It is only used to pool connections in the rpcConsul mode.
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// Raft connections are pooled separately. Maintain at most one
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// connection per host, for up to MaxTime. When MaxTime connection
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// reaping is disabled. MaxStreams is used to control the number of idle
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// streams allowed. If TLS settings are provided outgoing connections
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// use TLS.
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2013-12-09 20:09:57 +00:00
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type ConnPool struct {
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2017-06-15 13:16:16 +00:00
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// SrcAddr is the source address for outgoing connections.
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SrcAddr *net.TCPAddr
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2017-05-03 10:57:11 +00:00
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2014-05-28 23:32:10 +00:00
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// LogOutput is used to control logging
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2017-06-15 13:16:16 +00:00
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LogOutput io.Writer
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2014-05-28 23:32:10 +00:00
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2013-12-19 23:42:17 +00:00
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// The maximum time to keep a connection open
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2017-06-15 13:16:16 +00:00
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MaxTime time.Duration
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2013-12-19 23:42:17 +00:00
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2014-05-27 21:33:09 +00:00
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// The maximum number of open streams to keep
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2017-06-15 13:16:16 +00:00
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MaxStreams int
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2019-06-27 20:22:07 +00:00
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// TLSConfigurator
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TLSConfigurator *tlsutil.Configurator
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2017-06-15 13:16:16 +00:00
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2020-03-09 20:59:02 +00:00
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// GatewayResolver is a function that returns a suitable random mesh
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// gateway address for dialing servers in a given DC. This is only
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// needed if wan federation via mesh gateways is enabled.
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GatewayResolver func(string) string
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// Datacenter is the datacenter of the current agent.
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Datacenter string
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// Server should be set to true if this connection pool is configured in a
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// server instead of a client.
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Server bool
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2017-06-15 13:16:16 +00:00
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sync.Mutex
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2014-05-27 21:33:09 +00:00
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2020-03-09 20:59:02 +00:00
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// pool maps a nodeName+address to a open connection
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2014-02-06 00:19:05 +00:00
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pool map[string]*Conn
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2013-12-09 20:09:57 +00:00
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2015-08-13 01:48:15 +00:00
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// limiter is used to throttle the number of connect attempts
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2015-08-13 03:14:48 +00:00
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// to a given address. The first thread will attempt a connection
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// and put a channel in here, which all other threads will wait
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// on to close.
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limiter map[string]chan struct{}
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2015-08-13 01:48:15 +00:00
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2013-12-09 20:09:57 +00:00
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// Used to indicate the pool is shutdown
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2014-02-05 22:20:18 +00:00
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shutdown bool
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shutdownCh chan struct{}
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2017-06-15 13:16:16 +00:00
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// once initializes the internal data structures and connection
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// reaping on first use.
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once sync.Once
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2013-12-09 20:09:57 +00:00
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}
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2017-06-15 13:16:16 +00:00
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// init configures the initial data structures. It should be called
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// by p.once.Do(p.init) in all public methods.
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func (p *ConnPool) init() {
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p.pool = make(map[string]*Conn)
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p.limiter = make(map[string]chan struct{})
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p.shutdownCh = make(chan struct{})
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if p.MaxTime > 0 {
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go p.reap()
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2013-12-19 23:42:17 +00:00
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}
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2013-12-09 20:09:57 +00:00
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}
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// Shutdown is used to close the connection pool
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func (p *ConnPool) Shutdown() error {
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2017-06-15 13:16:16 +00:00
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p.once.Do(p.init)
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2013-12-09 20:09:57 +00:00
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p.Lock()
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defer p.Unlock()
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2014-02-06 00:19:05 +00:00
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for _, conn := range p.pool {
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conn.Close()
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2013-12-09 20:09:57 +00:00
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}
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2014-02-06 00:19:05 +00:00
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p.pool = make(map[string]*Conn)
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2013-12-09 20:09:57 +00:00
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2014-02-05 22:20:18 +00:00
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if p.shutdown {
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return nil
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}
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p.shutdown = true
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close(p.shutdownCh)
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2013-12-09 20:09:57 +00:00
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return nil
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}
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2015-08-13 01:48:15 +00:00
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// acquire will return a pooled connection, if available. Otherwise it will
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// wait for an existing connection attempt to finish, if one if in progress,
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// and will return that one if it succeeds. If all else fails, it will return a
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// newly-created connection and add it to the pool.
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2020-05-28 08:18:30 +00:00
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func (p *ConnPool) acquire(dc string, nodeName string, addr net.Addr) (*Conn, error) {
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2020-03-09 20:59:02 +00:00
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if nodeName == "" {
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return nil, fmt.Errorf("pool: ConnPool.acquire requires a node name")
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}
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2017-03-15 16:06:21 +00:00
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addrStr := addr.String()
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2020-03-09 20:59:02 +00:00
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poolKey := nodeName + ":" + addrStr
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2015-08-13 01:48:15 +00:00
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// Check to see if there's a pooled connection available. This is up
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2019-06-27 20:22:07 +00:00
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// here since it should the vastly more common case than the rest
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2015-08-13 01:48:15 +00:00
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// of the code here.
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p.Lock()
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2020-03-09 20:59:02 +00:00
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c := p.pool[poolKey]
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2015-08-13 01:48:15 +00:00
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if c != nil {
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2015-08-13 17:01:05 +00:00
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c.markForUse()
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2015-08-13 01:48:15 +00:00
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p.Unlock()
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return c, nil
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2013-12-09 20:09:57 +00:00
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}
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2015-08-13 01:48:15 +00:00
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// If not (while we are still locked), set up the throttling structure
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2015-08-13 03:14:48 +00:00
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// for this address, which will make everyone else wait until our
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// attempt is done.
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var wait chan struct{}
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2015-08-13 01:48:15 +00:00
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var ok bool
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2017-03-15 16:06:21 +00:00
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if wait, ok = p.limiter[addrStr]; !ok {
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2015-08-13 18:38:02 +00:00
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wait = make(chan struct{})
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2017-03-15 16:06:21 +00:00
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p.limiter[addrStr] = wait
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2015-08-13 01:48:15 +00:00
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}
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2015-08-13 03:14:48 +00:00
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isLeadThread := !ok
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2015-08-13 01:48:15 +00:00
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p.Unlock()
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2015-08-13 03:14:48 +00:00
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// If we are the lead thread, make the new connection and then wake
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// everybody else up to see if we got it.
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if isLeadThread {
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2020-05-28 08:18:30 +00:00
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c, err := p.getNewConn(dc, nodeName, addr)
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2015-08-13 17:01:05 +00:00
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p.Lock()
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2017-03-15 16:06:21 +00:00
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delete(p.limiter, addrStr)
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2015-08-13 17:01:05 +00:00
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close(wait)
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2015-08-13 03:14:48 +00:00
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if err != nil {
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2015-08-13 17:01:05 +00:00
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p.Unlock()
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2015-08-13 03:14:48 +00:00
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return nil, err
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}
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2020-03-09 20:59:02 +00:00
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p.pool[poolKey] = c
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2015-08-13 01:48:15 +00:00
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p.Unlock()
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return c, nil
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}
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2015-08-13 03:14:48 +00:00
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// Otherwise, wait for the lead thread to attempt the connection
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// and use what's in the pool at that point.
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select {
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case <-p.shutdownCh:
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return nil, fmt.Errorf("rpc error: shutdown")
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case <-wait:
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2015-08-13 01:48:15 +00:00
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}
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2015-08-13 03:14:48 +00:00
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// See if the lead thread was able to get us a connection.
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2015-08-13 01:48:15 +00:00
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p.Lock()
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2020-03-09 20:59:02 +00:00
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if c := p.pool[poolKey]; c != nil {
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2015-08-13 17:01:05 +00:00
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c.markForUse()
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2015-08-13 01:48:15 +00:00
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p.Unlock()
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2015-08-13 03:14:48 +00:00
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return c, nil
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2013-12-09 20:09:57 +00:00
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}
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2015-08-13 01:48:15 +00:00
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2014-05-28 23:55:39 +00:00
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p.Unlock()
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2015-08-13 03:14:48 +00:00
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return nil, fmt.Errorf("rpc error: lead thread didn't get connection")
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2013-12-09 20:09:57 +00:00
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}
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2019-08-12 16:47:02 +00:00
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// HalfCloser is an interface that exposes a TCP half-close without exposing
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// the underlying TLS or raw TCP connection.
|
2016-10-26 02:20:24 +00:00
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type HalfCloser interface {
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CloseWrite() error
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}
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|
2019-06-27 20:22:07 +00:00
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// DialTimeout is used to establish a raw connection to the given server, with
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// given connection timeout. It also writes RPCTLS as the first byte.
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2020-03-09 20:59:02 +00:00
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func (p *ConnPool) DialTimeout(
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dc string,
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nodeName string,
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addr net.Addr,
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actualRPCType RPCType,
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) (net.Conn, HalfCloser, error) {
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2017-06-15 13:16:16 +00:00
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p.once.Do(p.init)
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2020-03-09 20:59:02 +00:00
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if p.Server && p.GatewayResolver != nil && p.TLSConfigurator != nil && dc != p.Datacenter {
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// NOTE: TLS is required on this branch.
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return DialTimeoutWithRPCTypeViaMeshGateway(
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dc,
|
|
|
|
nodeName,
|
|
|
|
addr,
|
|
|
|
p.SrcAddr,
|
|
|
|
p.TLSConfigurator.OutgoingALPNRPCWrapper(),
|
|
|
|
actualRPCType,
|
|
|
|
RPCTLS,
|
|
|
|
// gateway stuff
|
|
|
|
p.Server,
|
|
|
|
p.TLSConfigurator,
|
|
|
|
p.GatewayResolver,
|
|
|
|
p.Datacenter,
|
|
|
|
)
|
|
|
|
}
|
|
|
|
|
2020-05-28 08:18:30 +00:00
|
|
|
return p.dial(
|
2020-03-09 20:59:02 +00:00
|
|
|
dc,
|
|
|
|
nodeName,
|
|
|
|
addr,
|
|
|
|
actualRPCType,
|
|
|
|
RPCTLS,
|
|
|
|
)
|
2019-06-27 20:22:07 +00:00
|
|
|
}
|
|
|
|
|
2020-05-28 08:18:30 +00:00
|
|
|
func (p *ConnPool) dial(
|
2020-03-09 20:59:02 +00:00
|
|
|
dc string,
|
|
|
|
nodeName string,
|
|
|
|
addr net.Addr,
|
|
|
|
actualRPCType RPCType,
|
|
|
|
tlsRPCType RPCType,
|
|
|
|
) (net.Conn, HalfCloser, error) {
|
2013-12-09 20:09:57 +00:00
|
|
|
// Try to dial the conn
|
2020-05-28 08:56:10 +00:00
|
|
|
d := &net.Dialer{LocalAddr: p.SrcAddr, Timeout: defaultDialTimeout}
|
2017-05-03 10:57:11 +00:00
|
|
|
conn, err := d.Dial("tcp", addr.String())
|
2013-12-09 20:09:57 +00:00
|
|
|
if err != nil {
|
2016-10-26 02:20:24 +00:00
|
|
|
return nil, nil, err
|
2013-12-09 20:09:57 +00:00
|
|
|
}
|
|
|
|
|
2016-10-26 02:20:24 +00:00
|
|
|
var hc HalfCloser
|
2019-08-12 16:47:02 +00:00
|
|
|
|
2014-04-04 23:27:56 +00:00
|
|
|
if tcp, ok := conn.(*net.TCPConn); ok {
|
|
|
|
tcp.SetKeepAlive(true)
|
|
|
|
tcp.SetNoDelay(true)
|
2019-08-12 16:47:02 +00:00
|
|
|
|
|
|
|
// Expose TCPConn CloseWrite method on HalfCloser
|
2016-10-26 02:20:24 +00:00
|
|
|
hc = tcp
|
2014-04-04 23:27:56 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// Check if TLS is enabled
|
2020-05-28 08:18:30 +00:00
|
|
|
if p.TLSConfigurator.UseTLS(dc) {
|
|
|
|
wrapper := p.TLSConfigurator.OutgoingRPCWrapper()
|
2014-04-04 23:27:56 +00:00
|
|
|
// Switch the connection into TLS mode
|
2020-03-09 20:59:02 +00:00
|
|
|
if _, err := conn.Write([]byte{byte(tlsRPCType)}); err != nil {
|
2014-04-04 23:27:56 +00:00
|
|
|
conn.Close()
|
2016-10-26 02:20:24 +00:00
|
|
|
return nil, nil, err
|
2014-04-04 23:27:56 +00:00
|
|
|
}
|
2013-12-09 20:09:57 +00:00
|
|
|
|
2014-04-04 23:27:56 +00:00
|
|
|
// Wrap the connection in a TLS client
|
2019-06-27 20:22:07 +00:00
|
|
|
tlsConn, err := wrapper(dc, conn)
|
2014-06-22 19:49:51 +00:00
|
|
|
if err != nil {
|
|
|
|
conn.Close()
|
2016-10-26 02:20:24 +00:00
|
|
|
return nil, nil, err
|
2014-06-22 19:49:51 +00:00
|
|
|
}
|
2014-10-02 17:26:25 +00:00
|
|
|
conn = tlsConn
|
2019-08-12 16:47:02 +00:00
|
|
|
|
|
|
|
// If this is a tls.Conn, expose HalfCloser to caller
|
|
|
|
if tlsConn, ok := conn.(*tls.Conn); ok {
|
|
|
|
hc = tlsConn
|
|
|
|
}
|
2014-04-04 23:27:56 +00:00
|
|
|
}
|
2013-12-09 20:09:57 +00:00
|
|
|
|
2020-03-09 20:59:02 +00:00
|
|
|
// Send the type-byte for the protocol if one is required.
|
|
|
|
//
|
|
|
|
// When using insecure TLS there is no inner type-byte as these connections
|
|
|
|
// aren't wrapped like the standard TLS ones are.
|
|
|
|
if tlsRPCType != RPCTLSInsecure {
|
|
|
|
if _, err := conn.Write([]byte{byte(actualRPCType)}); err != nil {
|
|
|
|
conn.Close()
|
|
|
|
return nil, nil, err
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2016-10-26 02:20:24 +00:00
|
|
|
return conn, hc, nil
|
|
|
|
}
|
|
|
|
|
2020-03-09 20:59:02 +00:00
|
|
|
// DialTimeoutWithRPCTypeViaMeshGateway dials the destination node and sets up
|
|
|
|
// the connection to be the correct RPC type using ALPN. This currently is
|
|
|
|
// exclusively used to dial other servers in foreign datacenters via mesh
|
|
|
|
// gateways.
|
|
|
|
//
|
|
|
|
// NOTE: There is a close mirror of this method in agent/consul/wanfed/wanfed.go:dial
|
|
|
|
func DialTimeoutWithRPCTypeViaMeshGateway(
|
|
|
|
dc string,
|
|
|
|
nodeName string,
|
|
|
|
addr net.Addr,
|
|
|
|
src *net.TCPAddr,
|
|
|
|
wrapper tlsutil.ALPNWrapper,
|
|
|
|
actualRPCType RPCType,
|
|
|
|
tlsRPCType RPCType,
|
|
|
|
// gateway stuff
|
|
|
|
dialingFromServer bool,
|
|
|
|
tlsConfigurator *tlsutil.Configurator,
|
|
|
|
gatewayResolver func(string) string,
|
|
|
|
thisDatacenter string,
|
|
|
|
) (net.Conn, HalfCloser, error) {
|
|
|
|
if !dialingFromServer {
|
|
|
|
return nil, nil, fmt.Errorf("must dial via mesh gateways from a server agent")
|
|
|
|
} else if gatewayResolver == nil {
|
|
|
|
return nil, nil, fmt.Errorf("gatewayResolver is nil")
|
|
|
|
} else if tlsConfigurator == nil {
|
|
|
|
return nil, nil, fmt.Errorf("tlsConfigurator is nil")
|
|
|
|
} else if dc == thisDatacenter {
|
|
|
|
return nil, nil, fmt.Errorf("cannot dial servers in the same datacenter via a mesh gateway")
|
|
|
|
} else if wrapper == nil {
|
|
|
|
return nil, nil, fmt.Errorf("cannot dial via a mesh gateway when outgoing TLS is disabled")
|
|
|
|
}
|
|
|
|
|
|
|
|
nextProto := actualRPCType.ALPNString()
|
|
|
|
if nextProto == "" {
|
|
|
|
return nil, nil, fmt.Errorf("rpc type %d cannot be routed through a mesh gateway", actualRPCType)
|
|
|
|
}
|
|
|
|
|
|
|
|
gwAddr := gatewayResolver(dc)
|
|
|
|
if gwAddr == "" {
|
|
|
|
return nil, nil, structs.ErrDCNotAvailable
|
|
|
|
}
|
|
|
|
|
2020-05-28 08:56:10 +00:00
|
|
|
dialer := &net.Dialer{LocalAddr: src, Timeout: defaultDialTimeout}
|
2020-03-09 20:59:02 +00:00
|
|
|
|
|
|
|
rawConn, err := dialer.Dial("tcp", gwAddr)
|
2016-10-26 02:20:24 +00:00
|
|
|
if err != nil {
|
2020-03-09 20:59:02 +00:00
|
|
|
return nil, nil, err
|
|
|
|
}
|
|
|
|
|
|
|
|
if tcp, ok := rawConn.(*net.TCPConn); ok {
|
|
|
|
_ = tcp.SetKeepAlive(true)
|
|
|
|
_ = tcp.SetNoDelay(true)
|
|
|
|
}
|
|
|
|
|
|
|
|
// NOTE: now we wrap the connection in a TLS client.
|
|
|
|
tlsConn, err := wrapper(dc, nodeName, nextProto, rawConn)
|
|
|
|
if err != nil {
|
|
|
|
return nil, nil, err
|
|
|
|
}
|
|
|
|
|
|
|
|
var conn net.Conn = tlsConn
|
|
|
|
|
|
|
|
var hc HalfCloser
|
|
|
|
if tlsConn, ok := conn.(*tls.Conn); ok {
|
|
|
|
// Expose *tls.Conn CloseWrite method on HalfCloser
|
|
|
|
hc = tlsConn
|
|
|
|
}
|
|
|
|
|
|
|
|
return conn, hc, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
// getNewConn is used to return a new connection
|
2020-05-28 08:18:30 +00:00
|
|
|
func (p *ConnPool) getNewConn(dc string, nodeName string, addr net.Addr) (*Conn, error) {
|
2020-03-09 20:59:02 +00:00
|
|
|
if nodeName == "" {
|
|
|
|
return nil, fmt.Errorf("pool: ConnPool.getNewConn requires a node name")
|
2016-10-26 02:20:24 +00:00
|
|
|
}
|
|
|
|
|
2020-03-09 20:59:02 +00:00
|
|
|
// Get a new, raw connection and write the Consul multiplex byte to set the mode
|
2020-05-28 08:56:10 +00:00
|
|
|
conn, _, err := p.DialTimeout(dc, nodeName, addr, RPCMultiplexV2)
|
2020-03-09 20:59:02 +00:00
|
|
|
if err != nil {
|
2017-04-21 01:59:42 +00:00
|
|
|
return nil, err
|
2014-05-27 21:33:09 +00:00
|
|
|
}
|
2013-12-09 22:52:22 +00:00
|
|
|
|
2017-04-21 01:59:42 +00:00
|
|
|
// Setup the logger
|
|
|
|
conf := yamux.DefaultConfig()
|
2017-06-15 13:16:16 +00:00
|
|
|
conf.LogOutput = p.LogOutput
|
2017-04-21 01:59:42 +00:00
|
|
|
|
|
|
|
// Create a multiplexed session
|
2020-05-28 07:48:34 +00:00
|
|
|
session, _ := yamux.Client(conn, conf)
|
2017-04-21 01:59:42 +00:00
|
|
|
|
2013-12-09 20:09:57 +00:00
|
|
|
// Wrap the connection
|
2015-02-16 22:04:47 +00:00
|
|
|
c := &Conn{
|
|
|
|
refCount: 1,
|
2020-03-09 20:59:02 +00:00
|
|
|
nodeName: nodeName,
|
2015-02-16 22:04:47 +00:00
|
|
|
addr: addr,
|
|
|
|
session: session,
|
|
|
|
clients: list.New(),
|
|
|
|
lastUsed: time.Now(),
|
|
|
|
pool: p,
|
|
|
|
}
|
2015-08-13 01:48:15 +00:00
|
|
|
return c, nil
|
2014-02-06 00:19:05 +00:00
|
|
|
}
|
|
|
|
|
2015-09-15 12:22:08 +00:00
|
|
|
// clearConn is used to clear any cached connection, potentially in response to an error
|
2014-05-28 23:55:39 +00:00
|
|
|
func (p *ConnPool) clearConn(conn *Conn) {
|
2020-03-09 20:59:02 +00:00
|
|
|
if conn.nodeName == "" {
|
|
|
|
panic("pool: ConnPool.acquire requires a node name")
|
|
|
|
}
|
|
|
|
|
2014-05-28 23:55:39 +00:00
|
|
|
// Ensure returned streams are closed
|
|
|
|
atomic.StoreInt32(&conn.shouldClose, 1)
|
|
|
|
|
|
|
|
// Clear from the cache
|
2017-03-15 16:06:21 +00:00
|
|
|
addrStr := conn.addr.String()
|
2020-03-09 20:59:02 +00:00
|
|
|
poolKey := conn.nodeName + ":" + addrStr
|
2014-02-06 00:19:05 +00:00
|
|
|
p.Lock()
|
2020-03-09 20:59:02 +00:00
|
|
|
if c, ok := p.pool[poolKey]; ok && c == conn {
|
|
|
|
delete(p.pool, poolKey)
|
2014-05-28 23:55:39 +00:00
|
|
|
}
|
|
|
|
p.Unlock()
|
|
|
|
|
|
|
|
// Close down immediately if idle
|
2014-06-13 16:25:01 +00:00
|
|
|
if refCount := atomic.LoadInt32(&conn.refCount); refCount == 0 {
|
2014-05-28 21:17:07 +00:00
|
|
|
conn.Close()
|
|
|
|
}
|
2014-02-06 00:19:05 +00:00
|
|
|
}
|
2013-12-09 20:09:57 +00:00
|
|
|
|
2014-02-06 00:19:05 +00:00
|
|
|
// releaseConn is invoked when we are done with a conn to reduce the ref count
|
|
|
|
func (p *ConnPool) releaseConn(conn *Conn) {
|
2014-05-28 23:55:39 +00:00
|
|
|
refCount := atomic.AddInt32(&conn.refCount, -1)
|
|
|
|
if refCount == 0 && atomic.LoadInt32(&conn.shouldClose) == 1 {
|
|
|
|
conn.Close()
|
|
|
|
}
|
2013-12-09 20:09:57 +00:00
|
|
|
}
|
2013-12-09 22:58:49 +00:00
|
|
|
|
2020-05-28 07:48:34 +00:00
|
|
|
// getClient is used to get a usable client for an address
|
2020-05-28 08:18:30 +00:00
|
|
|
func (p *ConnPool) getClient(dc string, nodeName string, addr net.Addr) (*Conn, *StreamClient, error) {
|
2014-02-06 00:19:05 +00:00
|
|
|
retries := 0
|
|
|
|
START:
|
2013-12-09 22:58:49 +00:00
|
|
|
// Try to get a conn first
|
2020-05-28 08:18:30 +00:00
|
|
|
conn, err := p.acquire(dc, nodeName, addr)
|
2013-12-09 22:58:49 +00:00
|
|
|
if err != nil {
|
2014-05-27 21:33:09 +00:00
|
|
|
return nil, nil, fmt.Errorf("failed to get conn: %v", err)
|
2013-12-09 22:58:49 +00:00
|
|
|
}
|
2014-02-06 00:19:05 +00:00
|
|
|
|
2014-05-27 21:33:09 +00:00
|
|
|
// Get a client
|
|
|
|
client, err := conn.getClient()
|
2014-02-06 00:19:05 +00:00
|
|
|
if err != nil {
|
2014-05-28 23:55:39 +00:00
|
|
|
p.clearConn(conn)
|
|
|
|
p.releaseConn(conn)
|
2014-02-06 00:19:05 +00:00
|
|
|
|
|
|
|
// Try to redial, possible that the TCP session closed due to timeout
|
|
|
|
if retries == 0 {
|
|
|
|
retries++
|
|
|
|
goto START
|
|
|
|
}
|
2014-05-27 21:33:09 +00:00
|
|
|
return nil, nil, fmt.Errorf("failed to start stream: %v", err)
|
2014-02-06 00:19:05 +00:00
|
|
|
}
|
2014-05-27 21:33:09 +00:00
|
|
|
return conn, client, nil
|
|
|
|
}
|
2014-02-06 00:19:05 +00:00
|
|
|
|
2014-05-27 21:33:09 +00:00
|
|
|
// RPC is used to make an RPC call to a remote host
|
2020-03-09 20:59:02 +00:00
|
|
|
func (p *ConnPool) RPC(
|
|
|
|
dc string,
|
|
|
|
nodeName string,
|
|
|
|
addr net.Addr,
|
|
|
|
method string,
|
|
|
|
args interface{},
|
|
|
|
reply interface{},
|
|
|
|
) error {
|
|
|
|
if nodeName == "" {
|
|
|
|
return fmt.Errorf("pool: ConnPool.RPC requires a node name")
|
|
|
|
}
|
|
|
|
|
2019-06-27 20:22:07 +00:00
|
|
|
if method == "AutoEncrypt.Sign" {
|
2020-03-09 20:59:02 +00:00
|
|
|
return p.rpcInsecure(dc, nodeName, addr, method, args, reply)
|
2019-06-27 20:22:07 +00:00
|
|
|
} else {
|
2020-05-28 07:48:34 +00:00
|
|
|
return p.rpc(dc, nodeName, addr, method, args, reply)
|
2019-06-27 20:22:07 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// rpcInsecure is used to make an RPC call to a remote host.
|
|
|
|
// It doesn't actually use any of the pooling, it is here so that it is
|
|
|
|
// transparent for the consumer. The pool cannot be used because
|
|
|
|
// AutoEncrypt.Sign is a one-off call and it doesn't make sense to pool that
|
|
|
|
// connection if it is not being reused.
|
2020-03-09 20:59:02 +00:00
|
|
|
func (p *ConnPool) rpcInsecure(dc string, nodeName string, addr net.Addr, method string, args interface{}, reply interface{}) error {
|
2020-05-28 08:18:30 +00:00
|
|
|
if dc != p.Datacenter {
|
|
|
|
return fmt.Errorf("insecure dialing prohibited between datacenters")
|
|
|
|
}
|
|
|
|
|
2019-06-27 20:22:07 +00:00
|
|
|
var codec rpc.ClientCodec
|
2020-05-28 08:56:10 +00:00
|
|
|
conn, _, err := p.dial(dc, nodeName, addr, 0, RPCTLSInsecure)
|
2019-06-27 20:22:07 +00:00
|
|
|
if err != nil {
|
|
|
|
return fmt.Errorf("rpcinsecure error establishing connection: %v", err)
|
|
|
|
}
|
2020-02-07 21:50:24 +00:00
|
|
|
codec = msgpackrpc.NewCodecFromHandle(true, true, conn, structs.MsgpackHandle)
|
2019-06-27 20:22:07 +00:00
|
|
|
|
|
|
|
// Make the RPC call
|
|
|
|
err = msgpackrpc.CallWithCodec(codec, method, args, reply)
|
|
|
|
if err != nil {
|
|
|
|
return fmt.Errorf("rpcinsecure error making call: %v", err)
|
|
|
|
}
|
|
|
|
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
2020-05-28 07:48:34 +00:00
|
|
|
func (p *ConnPool) rpc(dc string, nodeName string, addr net.Addr, method string, args interface{}, reply interface{}) error {
|
2017-06-15 13:16:16 +00:00
|
|
|
p.once.Do(p.init)
|
|
|
|
|
2014-05-28 23:55:39 +00:00
|
|
|
// Get a usable client
|
2020-05-28 08:18:30 +00:00
|
|
|
conn, sc, err := p.getClient(dc, nodeName, addr)
|
2014-05-28 23:55:39 +00:00
|
|
|
if err != nil {
|
2017-10-10 22:19:50 +00:00
|
|
|
return fmt.Errorf("rpc error getting client: %v", err)
|
2014-05-28 23:55:39 +00:00
|
|
|
}
|
2013-12-09 22:58:49 +00:00
|
|
|
|
|
|
|
// Make the RPC call
|
2015-10-13 23:43:52 +00:00
|
|
|
err = msgpackrpc.CallWithCodec(sc.codec, method, args, reply)
|
2014-05-28 23:55:39 +00:00
|
|
|
if err != nil {
|
2015-04-07 21:17:20 +00:00
|
|
|
sc.Close()
|
2017-09-25 22:27:04 +00:00
|
|
|
|
|
|
|
// See the comment in leader_test.go TestLeader_ChangeServerID
|
|
|
|
// about how we found this. The tldr is that if we see this
|
|
|
|
// error, we know this connection is toast, so we should clear
|
|
|
|
// it and make a new one on the next attempt.
|
2017-10-10 22:19:50 +00:00
|
|
|
if lib.IsErrEOF(err) {
|
2017-09-25 22:27:04 +00:00
|
|
|
p.clearConn(conn)
|
|
|
|
}
|
|
|
|
|
2014-05-28 23:55:39 +00:00
|
|
|
p.releaseConn(conn)
|
2017-10-10 22:19:50 +00:00
|
|
|
return fmt.Errorf("rpc error making call: %v", err)
|
2013-12-09 22:58:49 +00:00
|
|
|
}
|
|
|
|
|
2014-05-28 23:55:39 +00:00
|
|
|
// Done with the connection
|
|
|
|
conn.returnClient(sc)
|
|
|
|
p.releaseConn(conn)
|
|
|
|
return nil
|
2013-12-09 22:58:49 +00:00
|
|
|
}
|
2013-12-19 23:42:17 +00:00
|
|
|
|
2017-06-15 13:16:16 +00:00
|
|
|
// Ping sends a Status.Ping message to the specified server and
|
2016-03-27 02:28:13 +00:00
|
|
|
// returns true if healthy, false if an error occurred
|
2020-05-28 07:48:34 +00:00
|
|
|
func (p *ConnPool) Ping(dc string, nodeName string, addr net.Addr) (bool, error) {
|
2016-03-27 02:28:13 +00:00
|
|
|
var out struct{}
|
2020-05-28 07:48:34 +00:00
|
|
|
err := p.RPC(dc, nodeName, addr, "Status.Ping", struct{}{}, &out)
|
2017-06-15 13:16:16 +00:00
|
|
|
return err == nil, err
|
2016-03-27 02:28:13 +00:00
|
|
|
}
|
|
|
|
|
2013-12-19 23:42:17 +00:00
|
|
|
// Reap is used to close conns open over maxTime
|
|
|
|
func (p *ConnPool) reap() {
|
2014-11-26 09:25:37 +00:00
|
|
|
for {
|
2013-12-19 23:42:17 +00:00
|
|
|
// Sleep for a while
|
2014-02-05 22:20:18 +00:00
|
|
|
select {
|
|
|
|
case <-p.shutdownCh:
|
|
|
|
return
|
2014-11-26 09:25:37 +00:00
|
|
|
case <-time.After(time.Second):
|
2014-02-05 22:20:18 +00:00
|
|
|
}
|
2013-12-19 23:42:17 +00:00
|
|
|
|
|
|
|
// Reap all old conns
|
|
|
|
p.Lock()
|
2014-02-06 00:19:05 +00:00
|
|
|
var removed []string
|
2013-12-19 23:42:17 +00:00
|
|
|
now := time.Now()
|
2014-02-06 00:19:05 +00:00
|
|
|
for host, conn := range p.pool {
|
|
|
|
// Skip recently used connections
|
2017-06-15 13:16:16 +00:00
|
|
|
if now.Sub(conn.lastUsed) < p.MaxTime {
|
2014-02-06 00:19:05 +00:00
|
|
|
continue
|
2013-12-19 23:42:17 +00:00
|
|
|
}
|
2014-02-06 00:19:05 +00:00
|
|
|
|
|
|
|
// Skip connections with active streams
|
|
|
|
if atomic.LoadInt32(&conn.refCount) > 0 {
|
|
|
|
continue
|
|
|
|
}
|
|
|
|
|
|
|
|
// Close the conn
|
|
|
|
conn.Close()
|
|
|
|
|
|
|
|
// Remove from pool
|
|
|
|
removed = append(removed, host)
|
|
|
|
}
|
|
|
|
for _, host := range removed {
|
|
|
|
delete(p.pool, host)
|
2013-12-19 23:42:17 +00:00
|
|
|
}
|
|
|
|
p.Unlock()
|
|
|
|
}
|
|
|
|
}
|