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consul.go
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consul.go
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package services
import (
"encoding/json"
"fmt"
"os"
"os/exec"
"path/filepath"
"syscall"
"io/ioutil"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
"github.com/onsi/gomega/gbytes"
"github.com/onsi/gomega/gexec"
"github.com/solo-io/go-utils/log"
)
const defaultConsulDockerImage = "consul@sha256:6ffe55dcc1000126a6e874b298fe1f1b87f556fb344781af60681932e408ec6a"
type ConsulFactory struct {
consulpath string
tmpdir string
}
func NewConsulFactory() (*ConsulFactory, error) {
consulpath := os.Getenv("CONSUL_BINARY")
if consulpath != "" {
return &ConsulFactory{
consulpath: consulpath,
}, nil
}
consulpath, err := exec.LookPath("consul")
if err == nil {
log.Printf("Using consul from PATH: %s", consulpath)
return &ConsulFactory{
consulpath: consulpath,
}, nil
}
// try to grab one form docker...
tmpdir, err := ioutil.TempDir(os.Getenv("HELPER_TMP"), "consul")
if err != nil {
return nil, err
}
bash := fmt.Sprintf(`
set -ex
CID=$(docker run -d %s /bin/sh -c exit)
# just print the image sha for repoducibility
echo "Using Consul Image:"
docker inspect %s -f "{{.RepoDigests}}"
docker cp $CID:/bin/consul .
docker rm -f $CID
`, defaultConsulDockerImage, defaultConsulDockerImage)
scriptfile := filepath.Join(tmpdir, "getconsul.sh")
ioutil.WriteFile(scriptfile, []byte(bash), 0755)
cmd := exec.Command("bash", scriptfile)
cmd.Dir = tmpdir
cmd.Stdout = GinkgoWriter
cmd.Stderr = GinkgoWriter
if err := cmd.Run(); err != nil {
return nil, err
}
return &ConsulFactory{
consulpath: filepath.Join(tmpdir, "consul"),
tmpdir: tmpdir,
}, nil
}
func (ef *ConsulFactory) Clean() error {
if ef == nil {
return nil
}
if ef.tmpdir != "" {
os.RemoveAll(ef.tmpdir)
}
return nil
}
type ConsulInstance struct {
consulpath string
tmpdir string
cfgdir string
cmd *exec.Cmd
session *gexec.Session
}
func (ef *ConsulFactory) NewConsulInstance() (*ConsulInstance, error) {
// try to grab one form docker...
tmpdir, err := ioutil.TempDir(os.Getenv("HELPER_TMP"), "consul")
if err != nil {
return nil, err
}
cfgdir := filepath.Join(tmpdir, "config")
os.Mkdir(cfgdir, 0755)
cmd := exec.Command(ef.consulpath, "agent", "-dev", "--client=0.0.0.0", "-config-dir", cfgdir)
cmd.Dir = ef.tmpdir
cmd.Stdout = GinkgoWriter
cmd.Stderr = GinkgoWriter
return &ConsulInstance{
consulpath: ef.consulpath,
tmpdir: tmpdir,
cfgdir: cfgdir,
cmd: cmd,
}, nil
}
func (i *ConsulInstance) AddConfig(name, content string) {
fname := filepath.Join(i.cfgdir, name)
ioutil.WriteFile(fname, []byte(content), 0644)
i.ReloadConfig()
}
func (i *ConsulInstance) AddConfigFromStruct(name string, cfg interface{}) {
content, err := json.Marshal(cfg)
Expect(err).NotTo(HaveOccurred())
i.AddConfig(name, string(content))
}
func (i *ConsulInstance) ReloadConfig() {
i.cmd.Process.Signal(syscall.SIGHUP)
}
func (i *ConsulInstance) Silence() {
i.cmd.Stdout = nil
i.cmd.Stderr = nil
}
func (i *ConsulInstance) Run() error {
var err error
i.session, err = gexec.Start(i.cmd, GinkgoWriter, GinkgoWriter)
if err != nil {
return err
}
Eventually(i.session.Out, "5s").Should(gbytes.Say("New leader elected"))
return nil
}
func (i *ConsulInstance) Binary() string {
return i.consulpath
}
func (i *ConsulInstance) Clean() error {
if i.session != nil {
i.session.Kill()
}
if i.tmpdir != "" {
os.RemoveAll(i.tmpdir)
}
return nil
}