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workload.go
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workload.go
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// Copyright (c) 2017-2018 Tigera, Inc. All rights reserved.
//
// 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.
package workload
import (
"bufio"
"fmt"
"io"
"io/ioutil"
"os/exec"
"reflect"
"regexp"
"strconv"
"strings"
"sync"
"time"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
"github.com/onsi/gomega/types"
log "github.com/sirupsen/logrus"
"github.com/projectcalico/libcalico-go/lib/backend/k8s/conversion"
"github.com/projectcalico/libcalico-go/lib/options"
"github.com/projectcalico/libcalico-go/lib/set"
"github.com/projectcalico/felix/fv/containers"
"github.com/projectcalico/felix/fv/infrastructure"
"github.com/projectcalico/felix/fv/utils"
api "github.com/projectcalico/libcalico-go/lib/apis/v3"
client "github.com/projectcalico/libcalico-go/lib/clientv3"
)
type Workload struct {
C *containers.Container
Name string
InterfaceName string
IP string
Ports string
DefaultPort string
runCmd *exec.Cmd
outPipe io.ReadCloser
errPipe io.ReadCloser
namespacePath string
WorkloadEndpoint *api.WorkloadEndpoint
Protocol string // "tcp" or "udp"
}
var workloadIdx = 0
func (w *Workload) Stop() {
if w == nil {
log.Info("Stop no-op because nil workload")
} else {
log.WithField("workload", w).Info("Stop")
outputBytes, err := utils.Command("docker", "exec", w.C.Name,
"cat", fmt.Sprintf("/tmp/%v", w.Name)).CombinedOutput()
Expect(err).NotTo(HaveOccurred())
pid := strings.TrimSpace(string(outputBytes))
err = utils.Command("docker", "exec", w.C.Name, "kill", pid).Run()
Expect(err).NotTo(HaveOccurred())
w.runCmd.Process.Wait()
log.WithField("workload", w).Info("Workload now stopped")
}
}
func Run(c *infrastructure.Felix, name, profile, ip, ports string, protocol string) (w *Workload) {
w, err := run(c, name, profile, ip, ports, protocol)
if err != nil {
log.WithError(err).Info("Starting workload failed, retrying")
w, err = run(c, name, profile, ip, ports, protocol)
}
Expect(err).NotTo(HaveOccurred())
return w
}
func run(c *infrastructure.Felix, name, profile, ip, ports string, protocol string) (w *Workload, err error) {
workloadIdx++
n := fmt.Sprintf("%s-idx%v", name, workloadIdx)
interfaceName := conversion.VethNameForWorkload(profile, n)
if c.IP == ip {
interfaceName = ""
}
// Build unique workload name and struct.
workloadIdx++
w = &Workload{
C: c.Container,
Name: n,
InterfaceName: interfaceName,
IP: ip,
Ports: ports,
Protocol: protocol,
}
// Ensure that the host has the 'test-workload' binary.
w.C.EnsureBinary("test-workload")
// Start the workload.
log.WithField("workload", w).Info("About to run workload")
var udpArg string
if protocol == "udp" {
udpArg = "--udp"
}
w.runCmd = utils.Command("docker", "exec", w.C.Name,
"sh", "-c",
fmt.Sprintf("echo $$ > /tmp/%v; exec /test-workload %v '%v' '%v' '%v'",
w.Name,
udpArg,
w.InterfaceName,
w.IP,
w.Ports))
w.outPipe, err = w.runCmd.StdoutPipe()
if err != nil {
return nil, fmt.Errorf("Getting StdoutPipe failed: %v", err)
}
w.errPipe, err = w.runCmd.StderrPipe()
if err != nil {
return nil, fmt.Errorf("Getting StderrPipe failed: %v", err)
}
err = w.runCmd.Start()
if err != nil {
return nil, fmt.Errorf("runCmd Start failed: %v", err)
}
// Read the workload's namespace path, which it writes to its standard output.
stdoutReader := bufio.NewReader(w.outPipe)
stderrReader := bufio.NewReader(w.errPipe)
var errDone sync.WaitGroup
errDone.Add(1)
go func() {
defer errDone.Done()
for {
line, err := stderrReader.ReadString('\n')
if err != nil {
log.WithError(err).Info("End of workload stderr")
return
}
log.Infof("Workload %s stderr: %s", name, strings.TrimSpace(string(line)))
}
}()
namespacePath, err := stdoutReader.ReadString('\n')
if err != nil {
// (Only) if we fail here, wait for the stderr to be output before returning.
defer errDone.Wait()
if err != nil {
return nil, fmt.Errorf("Reading from stdout failed: %v", err)
}
}
w.namespacePath = strings.TrimSpace(namespacePath)
go func() {
for {
line, err := stdoutReader.ReadString('\n')
if err != nil {
log.WithError(err).Info("End of workload stdout")
return
}
log.Infof("Workload %s stdout: %s", name, strings.TrimSpace(string(line)))
}
}()
log.WithField("workload", w).Info("Workload now running")
wep := api.NewWorkloadEndpoint()
wep.Labels = map[string]string{"name": w.Name}
wep.Spec.Node = w.C.Hostname
wep.Spec.Orchestrator = "felixfv"
wep.Spec.Workload = w.Name
wep.Spec.Endpoint = w.Name
prefixLen := "32"
if strings.Contains(w.IP, ":") {
prefixLen = "128"
}
wep.Spec.IPNetworks = []string{w.IP + "/" + prefixLen}
wep.Spec.InterfaceName = w.InterfaceName
wep.Spec.Profiles = []string{profile}
w.WorkloadEndpoint = wep
return w, nil
}
func (w *Workload) IPNet() string {
return w.IP + "/32"
}
func (w *Workload) Configure(client client.Interface) {
wep := w.WorkloadEndpoint
wep.Namespace = "fv"
var err error
w.WorkloadEndpoint, err = client.WorkloadEndpoints().Create(utils.Ctx, w.WorkloadEndpoint, utils.NoOptions)
Expect(err).NotTo(HaveOccurred())
}
func (w *Workload) RemoveFromDatastore(client client.Interface) {
_, err := client.WorkloadEndpoints().Delete(utils.Ctx, "fv", w.WorkloadEndpoint.Name, options.DeleteOptions{})
Expect(err).NotTo(HaveOccurred())
}
func (w *Workload) ConfigureInDatastore(infra infrastructure.DatastoreInfra) {
wep := w.WorkloadEndpoint
wep.Namespace = "default"
var err error
w.WorkloadEndpoint, err = infra.AddWorkload(wep)
Expect(err).NotTo(HaveOccurred(), "Failed to add workload")
}
func (w *Workload) NameSelector() string {
return "name=='" + w.Name + "'"
}
func (w *Workload) SourceName() string {
return w.Name
}
func (w *Workload) CanConnectTo(ip, port, protocol string) bool {
anyPort := Port{
Workload: w,
}
return anyPort.CanConnectTo(ip, port, protocol)
}
func (w *Workload) Port(port uint16) *Port {
return &Port{
Workload: w,
Port: port,
}
}
type Port struct {
*Workload
Port uint16
}
func (w *Port) SourceName() string {
if w.Port == 0 {
return w.Name
}
return fmt.Sprintf("%s:%d", w.Name, w.Port)
}
func (w *Workload) NamespaceID() string {
splits := strings.Split(w.namespacePath, "/")
return splits[len(splits)-1]
}
func (w *Workload) ExecOutput(args ...string) (string, error) {
args = append([]string{"ip", "netns", "exec", w.NamespaceID()}, args...)
return w.C.ExecOutput(args...)
}
var (
rttRegexp = regexp.MustCompile(`rtt=(.*) ms`)
)
func (w *Workload) LatencyTo(ip, port string) time.Duration {
if strings.Contains(ip, ":") {
ip = fmt.Sprintf("[%s]", ip)
}
out, err := w.ExecOutput("hping", "-p", port, "-c", "20", "--fast", "-S", "-n", ip)
stderr := ""
if err, ok := err.(*exec.ExitError); ok {
stderr = string(err.Stderr)
}
Expect(err).NotTo(HaveOccurred(), stderr)
lines := strings.Split(out, "\n")[1:] // Skip header line
var rttSum time.Duration
for _, line := range lines {
if len(line) == 0 {
continue
}
matches := rttRegexp.FindStringSubmatch(line)
Expect(matches).To(HaveLen(2), "Failed to extract RTT from line: "+line)
rttMsecStr := matches[1]
rttMsec, err := strconv.ParseFloat(rttMsecStr, 64)
Expect(err).ToNot(HaveOccurred())
rttSum += time.Duration(rttMsec * float64(time.Millisecond))
}
meanRtt := rttSum / time.Duration(len(lines))
return meanRtt
}
func (p *Port) CanConnectTo(ip, port, protocol string) bool {
// Ensure that the host has the 'test-connection' binary.
p.C.EnsureBinary("test-connection")
if protocol == "udp" {
// If this is a retry then we may have stale conntrack entries and we don't want those
// to influence the connectivity check. Only an issue for UDP due to the lack of a
// sequence number.
p.C.ExecMayFail("conntrack", "-D", "-p", "udp", "-s", p.Workload.IP, "-d", ip)
}
// Run 'test-connection' to the target.
args := []string{
"exec", p.C.Name, "/test-connection", p.namespacePath, ip, port, "--protocol=" + protocol,
}
if p.Port != 0 {
// If we are using a particular source port, fill it in.
args = append(args, fmt.Sprintf("--source-port=%d", p.Port))
}
connectionCmd := utils.Command("docker", args...)
outPipe, err := connectionCmd.StdoutPipe()
Expect(err).NotTo(HaveOccurred())
errPipe, err := connectionCmd.StderrPipe()
Expect(err).NotTo(HaveOccurred())
err = connectionCmd.Start()
Expect(err).NotTo(HaveOccurred())
wOut, err := ioutil.ReadAll(outPipe)
Expect(err).NotTo(HaveOccurred())
wErr, err := ioutil.ReadAll(errPipe)
Expect(err).NotTo(HaveOccurred())
err = connectionCmd.Wait()
log.WithFields(log.Fields{
"stdout": string(wOut),
"stderr": string(wErr)}).WithError(err).Info("Connection test")
return err == nil
}
// ToMatcher implements the connectionTarget interface, allowing this port to be used as
// target.
func (p *Port) ToMatcher(explicitPort ...uint16) *connectivityMatcher {
if p.Port == 0 {
return p.Workload.ToMatcher(explicitPort...)
}
return &connectivityMatcher{
ip: p.Workload.IP,
port: fmt.Sprint(p.Port),
targetName: fmt.Sprintf("%s on port %d", p.Workload.Name, p.Port),
}
}
type connectionTarget interface {
ToMatcher(explicitPort ...uint16) *connectivityMatcher
}
type IP string // Just so we can define methods on it...
func (s IP) ToMatcher(explicitPort ...uint16) *connectivityMatcher {
if len(explicitPort) != 1 {
panic("Explicit port needed with IP as a connectivity target")
}
port := fmt.Sprintf("%d", explicitPort[0])
return &connectivityMatcher{
ip: string(s),
port: port,
targetName: string(s) + ":" + port,
protocol: "tcp",
}
}
func (w *Workload) ToMatcher(explicitPort ...uint16) *connectivityMatcher {
var port string
if len(explicitPort) == 1 {
port = fmt.Sprintf("%d", explicitPort[0])
} else if w.DefaultPort != "" {
port = w.DefaultPort
} else if !strings.Contains(w.Ports, ",") {
port = w.Ports
} else {
panic("Explicit port needed for workload with multiple ports")
}
return &connectivityMatcher{
ip: w.IP,
port: port,
targetName: fmt.Sprintf("%s on port %s", w.Name, port),
protocol: "tcp",
}
}
func HaveConnectivityTo(target connectionTarget, explicitPort ...uint16) types.GomegaMatcher {
return target.ToMatcher(explicitPort...)
}
type connectivityMatcher struct {
ip, port, targetName, protocol string
}
type connectionSource interface {
CanConnectTo(ip, port, protocol string) bool
SourceName() string
}
func (m *connectivityMatcher) Match(actual interface{}) (success bool, err error) {
success = actual.(connectionSource).CanConnectTo(m.ip, m.port, m.protocol)
return
}
func (m *connectivityMatcher) FailureMessage(actual interface{}) (message string) {
src := actual.(connectionSource)
message = fmt.Sprintf("Expected %v\n\t%+v\nto have connectivity to %v\n\t%v:%v\nbut it does not", src.SourceName(), src, m.targetName, m.ip, m.port)
return
}
func (m *connectivityMatcher) NegatedFailureMessage(actual interface{}) (message string) {
src := actual.(connectionSource)
message = fmt.Sprintf("Expected %v\n\t%+v\nnot to have connectivity to %v\n\t%v:%v\nbut it does", src.SourceName(), src, m.targetName, m.ip, m.port)
return
}
type expectation struct {
from connectionSource // Workload or Container
to *connectivityMatcher // Workload or IP, + port
expected bool
}
var UnactivatedConnectivityCheckers = set.New()
// ConnectivityChecker records a set of connectivity expectations and supports calculating the
// actual state of the connectivity between the given workloads. It is expected to be used like so:
//
// var cc = &workload.ConnectivityChecker{}
// cc.ExpectNone(w[2], w[0], 1234)
// cc.ExpectSome(w[1], w[0], 5678)
// Eventually(cc.ActualConnectivity, "10s", "100ms").Should(Equal(cc.ExpectedConnectivity()))
//
// Note that the ActualConnectivity method is passed to Eventually as a function pointer to allow
// Ginkgo to re-evaluate the result as needed.
type ConnectivityChecker struct {
ReverseDirection bool
Protocol string // "tcp" or "udp"
expectations []expectation
}
func (c *ConnectivityChecker) ExpectSome(from connectionSource, to connectionTarget, explicitPort ...uint16) {
UnactivatedConnectivityCheckers.Add(c)
if c.ReverseDirection {
from, to = to.(connectionSource), from.(connectionTarget)
}
c.expectations = append(c.expectations, expectation{from, to.ToMatcher(explicitPort...), true})
}
func (c *ConnectivityChecker) ExpectNone(from connectionSource, to connectionTarget, explicitPort ...uint16) {
UnactivatedConnectivityCheckers.Add(c)
if c.ReverseDirection {
from, to = to.(connectionSource), from.(connectionTarget)
}
c.expectations = append(c.expectations, expectation{from, to.ToMatcher(explicitPort...), false})
}
func (c *ConnectivityChecker) ResetExpectations() {
c.expectations = nil
}
// ActualConnectivity calculates the current connectivity for all the expected paths. One string is
// returned for each expectation, in the order they were recorded. The strings are intended to be
// human readable, and they are in the same order and format as those returned by
// ExpectedConnectivity().
func (c *ConnectivityChecker) ActualConnectivity() []string {
UnactivatedConnectivityCheckers.Discard(c)
var wg sync.WaitGroup
result := make([]string, len(c.expectations))
for i, exp := range c.expectations {
wg.Add(1)
go func(i int, exp expectation) {
defer wg.Done()
p := "tcp"
if c.Protocol != "" {
p = c.Protocol
}
hasConnectivity := exp.from.CanConnectTo(exp.to.ip, exp.to.port, p)
result[i] = fmt.Sprintf("%s -> %s = %v", exp.from.SourceName(), exp.to.targetName, hasConnectivity)
}(i, exp)
}
wg.Wait()
log.Debug("Connectivity", result)
return result
}
// ExpectedConnectivity returns one string per recorded expection in order, encoding the expected
// connectivity in the same format used by ActualConnectivity().
func (c *ConnectivityChecker) ExpectedConnectivity() []string {
result := make([]string, len(c.expectations))
for i, exp := range c.expectations {
result[i] = fmt.Sprintf("%s -> %s = %v", exp.from.SourceName(), exp.to.targetName, exp.expected)
}
return result
}
func (c *ConnectivityChecker) CheckConnectivityOffset(offset int, optionalDescription ...interface{}) {
c.CheckConnectivityWithTimeoutOffset(offset+2, 10*time.Second, optionalDescription...)
}
func (c *ConnectivityChecker) CheckConnectivity(optionalDescription ...interface{}) {
c.CheckConnectivityWithTimeoutOffset(2, 10*time.Second, optionalDescription...)
}
func (c *ConnectivityChecker) CheckConnectivityWithTimeout(timeout time.Duration, optionalDescription ...interface{}) {
Expect(timeout).To(BeNumerically(">", 100*time.Millisecond),
"Very low timeout, did you mean to multiply by time.<Unit>?")
if len(optionalDescription) > 0 {
Expect(optionalDescription[0]).NotTo(BeAssignableToTypeOf(time.Second),
"Unexpected time.Duration passed for description")
}
c.CheckConnectivityWithTimeoutOffset(2, timeout, optionalDescription...)
}
func (c *ConnectivityChecker) CheckConnectivityWithTimeoutOffset(callerSkip int, timeout time.Duration, optionalDescription ...interface{}) {
expConnectivity := c.ExpectedConnectivity()
start := time.Now()
// Track the number of attempts. If the first connectivity check fails, we want to
// do at least one retry before we time out. That covers the case where the first
// connectivity check takes longer than the timeout.
completedAttempts := 0
var actualConn []string
for time.Since(start) < timeout || completedAttempts < 2 {
actualConn = c.ActualConnectivity()
if reflect.DeepEqual(actualConn, expConnectivity) {
return
}
completedAttempts++
}
// Build a concise description of the incorrect connectivity.
for i := range actualConn {
if actualConn[i] != expConnectivity[i] {
actualConn[i] += " <---- WRONG"
expConnectivity[i] += " <----"
}
}
message := fmt.Sprintf(
"Connectivity was incorrect:\n\nExpected\n %s\nto match\n %s",
strings.Join(actualConn, "\n "),
strings.Join(expConnectivity, "\n "),
)
Fail(message, callerSkip)
}