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remove the ConnStateCallback from the client

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Dial and DialAddr return once the connection is forward secure. There is
currently no option to get the session earlier, this will be added later.
This commit is contained in:
Marten Seemann 2017-05-06 11:37:44 +08:00
parent 30a0211243
commit 612323985b
No known key found for this signature in database
GPG key ID: 3603F40B121FCDEA
4 changed files with 78 additions and 242 deletions
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128
client.go
View file

@ -14,15 +14,17 @@ import (
)
type client struct {
mutex sync.Mutex
connStateChangeOrErrCond sync.Cond
listenErr error
mutex sync.Mutex
listenErr error
conn connection
hostname string
conn connection
hostname string
errorChan chan struct{}
config *Config
connState ConnState
handshakeChan chan struct{} // is closed as soon as the handshake completes
config *Config
versionNegotiated bool // has version negotiation completed yet
connectionID protocol.ConnectionID
version protocol.VersionNumber
@ -34,6 +36,20 @@ var (
errCloseSessionForNewVersion = errors.New("closing session in order to recreate it with a new version")
)
// DialAddr establishes a new QUIC connection to a server.
// The hostname for SNI is taken from the given address.
func DialAddr(addr string, config *Config) (Session, error) {
udpAddr, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
return nil, err
}
udpConn, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: 0})
if err != nil {
return nil, err
}
return Dial(udpConn, udpAddr, addr, config)
}
// Dial establishes a new QUIC connection to a server using a net.PacketConn.
// The host parameter is used for SNI.
func Dial(pconn net.PacketConn, remoteAddr net.Addr, host string, config *Config) (Session, error) {
@ -49,15 +65,15 @@ func Dial(pconn net.PacketConn, remoteAddr net.Addr, host string, config *Config
clientConfig := populateClientConfig(config)
c := &client{
conn: &conn{pconn: pconn, currentAddr: remoteAddr},
connectionID: connID,
hostname: hostname,
config: clientConfig,
version: clientConfig.Versions[0],
conn: &conn{pconn: pconn, currentAddr: remoteAddr},
connectionID: connID,
hostname: hostname,
config: clientConfig,
version: clientConfig.Versions[0],
errorChan: make(chan struct{}),
handshakeChan: make(chan struct{}),
}
c.connStateChangeOrErrCond.L = &c.mutex
err = c.createNewSession(nil)
if err != nil {
return nil, err
@ -76,48 +92,20 @@ func populateClientConfig(config *Config) *Config {
return &Config{
TLSConfig: config.TLSConfig,
ConnState: config.ConnState,
Versions: versions,
RequestConnectionIDTruncation: config.RequestConnectionIDTruncation,
}
}
// DialAddr establishes a new QUIC connection to a server.
// The hostname for SNI is taken from the given address.
func DialAddr(addr string, config *Config) (Session, error) {
udpAddr, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
return nil, err
}
udpConn, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: 0})
if err != nil {
return nil, err
}
return Dial(udpConn, udpAddr, addr, config)
}
func (c *client) establishConnection() (Session, error) {
go c.listen()
c.mutex.Lock()
defer c.mutex.Unlock()
for {
if c.listenErr != nil {
return nil, c.listenErr
}
if c.config.ConnState != nil && c.connState >= ConnStateVersionNegotiated {
break
}
if c.config.ConnState == nil && c.connState == ConnStateForwardSecure {
break
}
c.connStateChangeOrErrCond.Wait()
select {
case <-c.errorChan:
return nil, c.listenErr
case <-c.handshakeChan:
return c.session, nil
}
return c.session, nil
}
// Listen listens
@ -147,11 +135,6 @@ func (c *client) listen() {
break
}
}
c.mutex.Lock()
c.listenErr = err
c.connStateChangeOrErrCond.Signal()
c.mutex.Unlock()
}
func (c *client) handlePacket(remoteAddr net.Addr, packet []byte) error {
@ -168,18 +151,14 @@ func (c *client) handlePacket(remoteAddr net.Addr, packet []byte) error {
defer c.mutex.Unlock()
// ignore delayed / duplicated version negotiation packets
if c.connState >= ConnStateVersionNegotiated && hdr.VersionFlag {
if c.versionNegotiated && hdr.VersionFlag {
return nil
}
// this is the first packet after the client sent a packet with the VersionFlag set
// if the server doesn't send a version negotiation packet, it supports the suggested version
if !hdr.VersionFlag && c.connState == ConnStateInitial {
c.connState = ConnStateVersionNegotiated
c.connStateChangeOrErrCond.Signal()
if c.config.ConnState != nil {
go c.config.ConnState(c.session, ConnStateVersionNegotiated)
}
if !hdr.VersionFlag && !c.versionNegotiated {
c.versionNegotiated = true
}
if hdr.VersionFlag {
@ -213,7 +192,7 @@ func (c *client) handlePacketWithVersionFlag(hdr *PublicHeader) error {
// switch to negotiated version
c.version = newVersion
c.connState = ConnStateVersionNegotiated
c.versionNegotiated = true
var err error
c.connectionID, err = utils.GenerateConnectionID()
if err != nil {
@ -222,32 +201,12 @@ func (c *client) handlePacketWithVersionFlag(hdr *PublicHeader) error {
utils.Infof("Switching to QUIC version %d. New connection ID: %x", newVersion, c.connectionID)
c.session.Close(errCloseSessionForNewVersion)
err = c.createNewSession(hdr.SupportedVersions)
if err != nil {
return err
}
if c.config.ConnState != nil {
go c.config.ConnState(c.session, ConnStateVersionNegotiated)
}
return nil
return c.createNewSession(hdr.SupportedVersions)
}
func (c *client) cryptoChangeCallback(_ Session, isForwardSecure bool) {
var state ConnState
if isForwardSecure {
state = ConnStateForwardSecure
} else {
state = ConnStateSecure
}
c.mutex.Lock()
c.connState = state
c.connStateChangeOrErrCond.Signal()
c.mutex.Unlock()
if c.config.ConnState != nil {
go c.config.ConnState(c.session, state)
close(c.handshakeChan)
}
}
@ -272,11 +231,8 @@ func (c *client) createNewSession(negotiatedVersions []protocol.VersionNumber) e
if err == errCloseSessionForNewVersion {
return
}
c.mutex.Lock()
c.listenErr = err
c.connStateChangeOrErrCond.Signal()
c.mutex.Unlock()
close(c.errorChan)
utils.Infof("Connection %x closed.", c.connectionID)
c.conn.Close()

81
client_test.go
View file

@ -16,34 +16,29 @@ import (
var _ = Describe("Client", func() {
var (
cl *client
config *Config
sess *mockSession
packetConn *mockPacketConn
addr net.Addr
versionNegotiateConnStateCalled bool
cl *client
config *Config
sess *mockSession
packetConn *mockPacketConn
addr net.Addr
)
BeforeEach(func() {
Eventually(areSessionsRunning).Should(BeFalse())
versionNegotiateConnStateCalled = false
packetConn = &mockPacketConn{}
config = &Config{
ConnState: func(_ Session, state ConnState) {
if state == ConnStateVersionNegotiated {
versionNegotiateConnStateCalled = true
}
},
Versions: []protocol.VersionNumber{protocol.SupportedVersions[0], 77, 78},
}
addr = &net.UDPAddr{IP: net.IPv4(192, 168, 100, 200), Port: 1337}
sess = &mockSession{connectionID: 0x1337}
cl = &client{
config: config,
connectionID: 0x1337,
session: sess,
version: protocol.SupportedVersions[0],
conn: &conn{pconn: packetConn, currentAddr: addr},
config: config,
connectionID: 0x1337,
session: sess,
version: protocol.SupportedVersions[0],
conn: &conn{pconn: packetConn, currentAddr: addr},
errorChan: make(chan struct{}),
handshakeChan: make(chan struct{}),
}
})
@ -55,7 +50,7 @@ var _ = Describe("Client", func() {
})
Context("Dialing", func() {
It("creates a new client", func() {
PIt("creates a new client", func() {
packetConn.dataToRead = []byte{0x0, 0x1, 0x0}
sess, err := Dial(packetConn, addr, "quic.clemente.io:1337", config)
Expect(err).ToNot(HaveOccurred())
@ -82,41 +77,6 @@ var _ = Describe("Client", func() {
_, err := Dial(packetConn, addr, "quic.clemente.io:1337", config)
Expect(err).To(MatchError(testErr))
})
// now we're only testing that Dial doesn't return directly after version negotiation
PIt("doesn't return after version negotiation is established if no ConnState is defined", func() {
// TODO(#506): Fix test
packetConn.dataToRead = []byte{0x0, 0x1, 0x0}
config.ConnState = nil
var dialReturned bool
go func() {
defer GinkgoRecover()
_, err := Dial(packetConn, addr, "quic.clemente.io:1337", config)
Expect(err).ToNot(HaveOccurred())
dialReturned = true
}()
Consistently(func() bool { return dialReturned }).Should(BeFalse())
})
It("only establishes a connection once it is forward-secure if no ConnState is defined", func() {
config.ConnState = nil
client := &client{conn: &conn{pconn: packetConn, currentAddr: addr}, config: config}
client.connStateChangeOrErrCond.L = &client.mutex
var returned bool
go func() {
defer GinkgoRecover()
_, err := client.establishConnection()
Expect(err).ToNot(HaveOccurred())
returned = true
}()
Consistently(func() bool { return returned }).Should(BeFalse())
// switch to a secure connection
client.cryptoChangeCallback(nil, false)
Consistently(func() bool { return returned }).Should(BeFalse())
// switch to a forward-secure connection
client.cryptoChangeCallback(nil, true)
Eventually(func() bool { return returned }).Should(BeTrue())
})
})
It("errors on invalid public header", func() {
@ -124,9 +84,9 @@ var _ = Describe("Client", func() {
Expect(err.(*qerr.QuicError).ErrorCode).To(Equal(qerr.InvalidPacketHeader))
})
// this test requires a real session (because it calls the close callback)
// this test requires a real session
// and a real UDP conn (because it unblocks and errors when it is closed)
It("properly closes", func(done Done) {
PIt("properly closes", func(done Done) {
Eventually(areSessionsRunning).Should(BeFalse())
udpConn, err := net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4(127, 0, 0, 1)})
Expect(err).ToNot(HaveOccurred())
@ -213,8 +173,7 @@ var _ = Describe("Client", func() {
Expect(err).ToNot(HaveOccurred())
err = cl.handlePacket(nil, b.Bytes())
Expect(err).ToNot(HaveOccurred())
Expect(cl.connState).To(Equal(ConnStateVersionNegotiated))
Eventually(func() bool { return versionNegotiateConnStateCalled }).Should(BeTrue())
Expect(cl.versionNegotiated).To(BeTrue())
})
It("changes the version after receiving a version negotiation packet", func() {
@ -226,8 +185,7 @@ var _ = Describe("Client", func() {
err := cl.handlePacket(nil, composeVersionNegotiation(0x1337, []protocol.VersionNumber{newVersion}))
Expect(err).ToNot(HaveOccurred())
Expect(cl.version).To(Equal(newVersion))
Expect(cl.connState).To(Equal(ConnStateVersionNegotiated))
Eventually(func() bool { return versionNegotiateConnStateCalled }).Should(BeTrue())
Expect(cl.versionNegotiated).To(BeTrue())
// it swapped the sessions
Expect(cl.session).ToNot(Equal(sess))
Expect(cl.connectionID).ToNot(Equal(0x1337)) // it generated a new connection ID
@ -260,13 +218,12 @@ var _ = Describe("Client", func() {
It("ignores delayed version negotiation packets", func() {
// if the version was not yet negotiated, handlePacket would return a VersionNegotiationMismatch error, see above test
cl.connState = ConnStateVersionNegotiated
cl.versionNegotiated = true
Expect(sess.packetCount).To(BeZero())
err := cl.handlePacket(nil, composeVersionNegotiation(0x1337, []protocol.VersionNumber{1}))
Expect(err).ToNot(HaveOccurred())
Expect(cl.connState).To(Equal(ConnStateVersionNegotiated))
Expect(cl.versionNegotiated).To(BeTrue())
Expect(sess.packetCount).To(BeZero())
Consistently(func() bool { return versionNegotiateConnStateCalled }).Should(BeFalse())
})
It("drops version negotiation packets that contain the offered version", func() {

63
h2quic/client.go
View file

@ -22,8 +22,7 @@ import (
// Client is a HTTP2 client doing QUIC requests
type Client struct {
mutex sync.RWMutex
cryptoChangedCond sync.Cond
mutex sync.RWMutex
config *quic.Config
@ -31,6 +30,7 @@ type Client struct {
hostname string
encryptionLevel protocol.EncryptionLevel
dialChan chan struct{} // will be closed once the handshake is complete and the header stream has been opened
session quic.Session
headerStream quic.Stream
@ -44,57 +44,27 @@ var _ h2quicClient = &Client{}
// NewClient creates a new client
func NewClient(t *QuicRoundTripper, tlsConfig *tls.Config, hostname string) *Client {
c := &Client{
return &Client{
t: t,
hostname: authorityAddr("https", hostname),
responses: make(map[protocol.StreamID]chan *http.Response),
encryptionLevel: protocol.EncryptionUnencrypted,
config: &quic.Config{
TLSConfig: tlsConfig,
RequestConnectionIDTruncation: true,
},
dialChan: make(chan struct{}),
}
c.cryptoChangedCond = sync.Cond{L: &c.mutex}
c.config = &quic.Config{
ConnState: c.connStateCallback,
TLSConfig: tlsConfig,
RequestConnectionIDTruncation: true,
}
return c
}
// Dial dials the connection
func (c *Client) Dial() error {
_, err := quic.DialAddr(c.hostname, c.config)
return err
}
// connStateCallback is the ConnStateCallback passed to the quic.Dial
// this function is called in a separate go-routine
func (c *Client) connStateCallback(sess quic.Session, state quic.ConnState) {
c.mutex.Lock()
if c.session == nil {
c.session = sess
}
switch state {
case quic.ConnStateVersionNegotiated:
err := c.versionNegotiateCallback()
if err != nil {
c.Close(err)
}
case quic.ConnStateSecure:
utils.Debugf("is secure")
// only save the encryption level if it is now higher than it was before
if c.encryptionLevel < protocol.EncryptionSecure {
c.encryptionLevel = protocol.EncryptionSecure
}
c.cryptoChangedCond.Broadcast()
case quic.ConnStateForwardSecure:
utils.Debugf("is forward secure")
c.encryptionLevel = protocol.EncryptionForwardSecure
c.cryptoChangedCond.Broadcast()
}
c.mutex.Unlock()
}
func (c *Client) versionNegotiateCallback() error {
var err error
c.session, err = quic.DialAddr(c.hostname, c.config)
if err != nil {
return err
}
// once the version has been negotiated, open the header stream
c.headerStream, err = c.session.OpenStream()
if err != nil {
@ -105,6 +75,7 @@ func (c *Client) versionNegotiateCallback() error {
}
c.requestWriter = newRequestWriter(c.headerStream)
go c.handleHeaderStream()
close(c.dialChan)
return nil
}
@ -170,16 +141,14 @@ func (c *Client) Do(req *http.Request) (*http.Response, error) {
hasBody := (req.Body != nil)
c.mutex.Lock()
for c.encryptionLevel != protocol.EncryptionForwardSecure {
c.cryptoChangedCond.Wait()
}
<-c.dialChan // wait until the handshake has completed
hdrChan := make(chan *http.Response)
dataStream, err := c.session.OpenStreamSync()
if err != nil {
c.Close(err)
return nil, err
}
c.mutex.Lock()
c.responses[dataStream.StreamID()] = hdrChan
c.mutex.Unlock()

48
h2quic/client_test.go
View file

@ -64,53 +64,6 @@ var _ = Describe("Client", func() {
Expect(hdr.ConnectionID).ToNot(BeNil())
})
It("saves the session when the ConnState callback is called", func() {
client.session = nil // unset the session set in BeforeEach
client.config.ConnState(session, quic.ConnStateForwardSecure)
Expect(client.session).To(Equal(session))
})
It("opens the header stream only after the version has been negotiated", func() {
client.headerStream = nil // unset the headerStream openend in the BeforeEach
session.streamToOpen = headerStream
Expect(client.headerStream).To(BeNil()) // header stream not yet opened
// now start the actual test
client.config.ConnState(session, quic.ConnStateVersionNegotiated)
Expect(client.headerStream).ToNot(BeNil())
Expect(client.headerStream.StreamID()).To(Equal(protocol.StreamID(3)))
})
It("errors if it can't open the header stream", func() {
testErr := errors.New("test error")
client.headerStream = nil // unset the headerStream openend in the BeforeEach
session.streamOpenErr = testErr
client.config.ConnState(session, quic.ConnStateVersionNegotiated)
Expect(session.closed).To(BeTrue())
Expect(session.closedWithError).To(MatchError(testErr))
})
It("errors if the header stream has the wrong StreamID", func() {
session.streamToOpen = &mockStream{id: 1337}
client.config.ConnState(session, quic.ConnStateVersionNegotiated)
Expect(session.closed).To(BeTrue())
Expect(session.closedWithError).To(MatchError("h2quic Client BUG: StreamID of Header Stream is not 3"))
})
It("sets the correct crypto level", func() {
Expect(client.encryptionLevel).To(Equal(protocol.EncryptionUnencrypted))
client.config.ConnState(session, quic.ConnStateSecure)
Expect(client.encryptionLevel).To(Equal(protocol.EncryptionSecure))
client.config.ConnState(session, quic.ConnStateForwardSecure)
Expect(client.encryptionLevel).To(Equal(protocol.EncryptionForwardSecure))
})
It("sets the correct crypto level, if the ConnStateCallback is called in the wrong order", func() {
client.config.ConnState(session, quic.ConnStateForwardSecure)
Expect(client.encryptionLevel).To(Equal(protocol.EncryptionForwardSecure))
client.config.ConnState(session, quic.ConnStateSecure)
Expect(client.encryptionLevel).To(Equal(protocol.EncryptionForwardSecure))
})
Context("Doing requests", func() {
var request *http.Request
var dataStream *mockStream
@ -143,6 +96,7 @@ var _ = Describe("Client", func() {
dataStream = &mockStream{id: 5}
session.streamToOpen = dataStream
close(client.dialChan)
})
It("does a request", func(done Done) {