mirror of
https://github.com/gravitational/teleport
synced 2024-10-21 09:44:51 +00:00
258 lines
6.3 KiB
Go
258 lines
6.3 KiB
Go
/*
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Copyright 2017 Gravitational, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package utils
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import (
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"bufio"
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"context"
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"fmt"
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"io/ioutil"
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"net"
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"net/http"
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"net/http/httptest"
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"net/url"
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"gopkg.in/check.v1"
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)
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type LBSuite struct {
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}
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var _ = check.Suite(&LBSuite{})
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func (s *LBSuite) SetUpSuite(c *check.C) {
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InitLoggerForTests()
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}
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func (s *LBSuite) TestSingleBackendLB(c *check.C) {
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backend1 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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fmt.Fprintf(w, "backend 1")
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}))
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defer backend1.Close()
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ports, err := GetFreeTCPPorts(1)
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c.Assert(err, check.IsNil)
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frontend := localAddr(ports[0])
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lb, err := NewLoadBalancer(context.TODO(), frontend, urlToNetAddr(backend1.URL))
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c.Assert(err, check.IsNil)
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err = lb.Listen()
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c.Assert(err, check.IsNil)
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go lb.Serve()
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defer lb.Close()
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out, err := roundtrip(frontend.String())
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c.Assert(err, check.IsNil)
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c.Assert(out, check.Equals, "backend 1")
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}
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func (s *LBSuite) TestTwoBackendsLB(c *check.C) {
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backend1 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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fmt.Fprintf(w, "backend 1")
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}))
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defer backend1.Close()
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backend2 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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fmt.Fprintf(w, "backend 2")
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}))
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defer backend2.Close()
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backend1Addr, backend2Addr := urlToNetAddr(backend1.URL), urlToNetAddr(backend2.URL)
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ports, err := GetFreeTCPPorts(1)
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c.Assert(err, check.IsNil)
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frontend := localAddr(ports[0])
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lb, err := NewLoadBalancer(context.TODO(), frontend)
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c.Assert(err, check.IsNil)
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err = lb.Listen()
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c.Assert(err, check.IsNil)
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go lb.Serve()
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defer lb.Close()
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// no endpoints
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_, err = roundtrip(frontend.String())
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c.Assert(err, check.NotNil)
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lb.AddBackend(backend1Addr)
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out, err := roundtrip(frontend.String())
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c.Assert(err, check.IsNil)
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c.Assert(out, check.Equals, "backend 1")
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lb.AddBackend(backend2Addr)
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out, err = roundtrip(frontend.String())
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c.Assert(err, check.IsNil)
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c.Assert(out, check.Equals, "backend 2")
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}
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func (s *LBSuite) TestOneFailingBackend(c *check.C) {
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backend1 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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fmt.Fprintf(w, "backend 1")
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}))
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defer backend1.Close()
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backend2 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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fmt.Fprintf(w, "backend 2")
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}))
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backend2.Close()
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backend1Addr, backend2Addr := urlToNetAddr(backend1.URL), urlToNetAddr(backend2.URL)
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ports, err := GetFreeTCPPorts(1)
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c.Assert(err, check.IsNil)
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frontend := localAddr(ports[0])
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lb, err := NewLoadBalancer(context.TODO(), frontend)
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c.Assert(err, check.IsNil)
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err = lb.Listen()
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c.Assert(err, check.IsNil)
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go lb.Serve()
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defer lb.Close()
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lb.AddBackend(backend1Addr)
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lb.AddBackend(backend2Addr)
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out, err := roundtrip(frontend.String())
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c.Assert(err, check.IsNil)
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c.Assert(out, check.Equals, "backend 1")
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out, err = roundtrip(frontend.String())
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c.Assert(err, check.NotNil)
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out, err = roundtrip(frontend.String())
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c.Assert(err, check.IsNil)
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c.Assert(out, check.Equals, "backend 1")
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}
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func (s *LBSuite) TestClose(c *check.C) {
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backend1 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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fmt.Fprintf(w, "backend 1")
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}))
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defer backend1.Close()
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ports, err := GetFreeTCPPorts(1)
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c.Assert(err, check.IsNil)
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frontend := localAddr(ports[0])
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lb, err := NewLoadBalancer(context.TODO(), frontend, urlToNetAddr(backend1.URL))
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c.Assert(err, check.IsNil)
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err = lb.Listen()
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c.Assert(err, check.IsNil)
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go lb.Serve()
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defer lb.Close()
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out, err := roundtrip(frontend.String())
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c.Assert(err, check.IsNil)
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c.Assert(out, check.Equals, "backend 1")
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lb.Close()
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// second close works
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lb.Close()
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// requests are failing
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out, err = roundtrip(frontend.String())
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c.Assert(err, check.NotNil)
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}
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func (s *LBSuite) TestDropConnections(c *check.C) {
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backend1 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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fmt.Fprintf(w, "backend 1")
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}))
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defer backend1.Close()
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ports, err := GetFreeTCPPorts(1)
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c.Assert(err, check.IsNil)
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frontend := localAddr(ports[0])
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backendAddr := urlToNetAddr(backend1.URL)
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lb, err := NewLoadBalancer(context.TODO(), frontend, backendAddr)
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c.Assert(err, check.IsNil)
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err = lb.Listen()
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c.Assert(err, check.IsNil)
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go lb.Serve()
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defer lb.Close()
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conn, err := net.Dial("tcp", frontend.String())
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c.Assert(err, check.IsNil)
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defer conn.Close()
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out, err := roundtripWithConn(conn)
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c.Assert(err, check.IsNil)
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c.Assert(out, check.Equals, "backend 1")
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// to make sure multiple requests work on the same wire
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out, err = roundtripWithConn(conn)
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c.Assert(err, check.IsNil)
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c.Assert(out, check.Equals, "backend 1")
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// removing backend results in dropped connection to this backend
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lb.RemoveBackend(backendAddr)
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out, err = roundtripWithConn(conn)
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c.Assert(err, check.NotNil)
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}
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func urlToNetAddr(u string) NetAddr {
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parsed, err := url.Parse(u)
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if err != nil {
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panic(err)
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}
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return *MustParseAddr(parsed.Host)
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}
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func localURL(port string) string {
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return fmt.Sprintf("http://127.0.0.1:%v", port)
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}
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func localAddr(port string) NetAddr {
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return *MustParseAddr(fmt.Sprintf("127.0.0.1:%v", port))
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}
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// roundtrip is a single connection simplistic HTTP client
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// that allows us to bypass a connection pool to test load balancing
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func roundtrip(addr string) (string, error) {
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conn, err := net.Dial("tcp", addr)
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if err != nil {
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return "", err
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}
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defer conn.Close()
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return roundtripWithConn(conn)
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}
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// roundtripWithConn uses HTTP get on the existing connection
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func roundtripWithConn(conn net.Conn) (string, error) {
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_, err := fmt.Fprintf(conn, "GET / HTTP/1.1\r\nHost: 127.0.0.1\r\n\r\n")
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if err != nil {
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return "", err
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}
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re, err := http.ReadResponse(bufio.NewReader(conn), nil)
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if err != nil {
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return "", err
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}
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defer re.Body.Close()
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out, err := ioutil.ReadAll(re.Body)
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if err != nil {
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return "", err
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}
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return string(out), nil
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}
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