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Scukerman
97 lines
2.8 KiB
Go
97 lines
2.8 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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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 controller
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import (
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"bytes"
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"github.com/golang/glog"
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"github.com/jcmoraisjr/haproxy-ingress/pkg/types"
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"github.com/jcmoraisjr/haproxy-ingress/pkg/utils"
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"os/exec"
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"regexp"
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"strconv"
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gotemplate "text/template"
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)
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type template struct {
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tmpl *gotemplate.Template
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rawConfig *bytes.Buffer
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fmtConfig *bytes.Buffer
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}
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var funcMap = gotemplate.FuncMap{
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"backendHash": func(input interface{}) string {
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if endpoint, ok := input.(string); ok {
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return utils.BackendHash(endpoint)
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}
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glog.Error("invalid type conversion on backendHash template function")
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return ""
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},
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"hostnameRegex": func(hostname string) string {
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rtn := regexp.MustCompile(`\.`).ReplaceAllLiteralString(hostname, "\\.")
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rtn = regexp.MustCompile(`\*`).ReplaceAllLiteralString(rtn, "([^\\.]+)")
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return "^" + rtn + "(:[0-9]+)?$"
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},
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"aliasRegex": func(hostname string) string {
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rtn := regexp.MustCompile(`\.`).ReplaceAllLiteralString(hostname, "\\.")
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return "^" + rtn + "(:[0-9]+)?$"
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},
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"isWildcardHostname": func(identifier string) bool {
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return regexp.MustCompile(`^\*\.`).MatchString(identifier)
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},
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"isRegexHostname": func(identifier string) bool {
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return !regexp.MustCompile(`^[a-zA-Z0-9\-.]+$`).MatchString(identifier)
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},
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"sizeSuffix": func(size string) string {
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value, err := utils.SizeSuffixToInt64(size)
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if err != nil {
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glog.Errorf("Error converting %v: %v", size, err)
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return size
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}
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return strconv.FormatInt(value, 10)
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},
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}
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func newTemplate(name string, file string) *template {
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tmpl, err := gotemplate.New(name).Funcs(funcMap).ParseFiles(file)
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if err != nil {
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glog.Fatalf("Cannot read template file: %v", err)
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}
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return &template{
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tmpl: tmpl,
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rawConfig: bytes.NewBuffer(make([]byte, 0, 16384)),
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fmtConfig: bytes.NewBuffer(make([]byte, 0, 16384)),
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}
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}
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func (t *template) execute(cfg *types.ControllerConfig) ([]byte, error) {
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t.rawConfig.Reset()
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t.fmtConfig.Reset()
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if err := t.tmpl.Execute(t.rawConfig, cfg); err != nil {
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return nil, err
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}
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cmd := exec.Command("sed", "/^ *$/d")
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cmd.Stdin = t.rawConfig
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cmd.Stdout = t.fmtConfig
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if err := cmd.Run(); err != nil {
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glog.Errorf("Template cleaning has failed: %v", err)
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// TODO recover and return raw buffer
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return nil, err
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}
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return t.fmtConfig.Bytes(), nil
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}
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