79 lines
1.6 KiB
Go
79 lines
1.6 KiB
Go
package haproxy
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import (
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"bytes"
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"context"
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"crypto/sha256"
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"io"
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"io/ioutil"
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"os"
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"os/exec"
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"sync"
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"text/template"
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)
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type ServiceManager interface {
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Reload(context.Context) error
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}
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type HAProxyManager struct {
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sync.Mutex
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configFile string
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serviceManager ServiceManager
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template *template.Template
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hash []byte
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}
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func NewHAProxyManager(configFile string) (*HAProxyManager, error) {
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t, err := template.New("haproxy").Parse(haproxyConfigTemplate)
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if err != nil {
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return nil, err
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}
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return &HAProxyManager{
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configFile: configFile,
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serviceManager: NewSystemdManager("haproxy"),
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template: t,
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}, nil
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}
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func (ha *HAProxyManager) checkConfig(ctx context.Context, lbs Config) (hash []byte, err error) {
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tmp, err := ioutil.TempFile(os.TempDir(), "haproxy_")
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if err != nil {
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return
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}
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defer tmp.Close()
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defer os.Remove(tmp.Name())
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h := sha256.New()
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w := io.MultiWriter(tmp, h)
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err = ha.template.Execute(w, lbs)
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if err != nil {
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return
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}
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hash = h.Sum(nil)
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return hash, exec.CommandContext(ctx, "haproxy", "-c", "-f", tmp.Name()).Run()
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}
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func (ha *HAProxyManager) UpdateConfig(ctx context.Context, lbs Config) error {
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ha.Lock()
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defer ha.Unlock()
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hash, err := ha.checkConfig(ctx, lbs)
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if err != nil {
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return err
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}
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if bytes.Equal(ha.hash, hash) {
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return nil
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}
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file, err := os.OpenFile(ha.configFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
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if err != nil {
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return err
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}
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err = ha.template.Execute(file, lbs)
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if err != nil {
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file.Close()
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return err
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}
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file.Close()
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ha.hash = hash
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return ha.serviceManager.Reload(ctx)
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}
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