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/**
* Copyright (c) 2018 ZTE Corporation.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and the Apache License 2.0 which both accompany this distribution,
* and are available at http://www.eclipse.org/legal/epl-v10.html
* and http://www.apache.org/licenses/LICENSE-2.0
*
* Contributors:
* ZTE - initial Project
*/
package pilot
import (
"bytes"
"msb2pilot/log"
"msb2pilot/models"
"msb2pilot/msb"
"os"
"regexp"
"strings"
istioModel "istio.io/istio/pilot/pkg/model"
)
var (
cachedServices []*models.MsbService
)
const (
routerulePrefix = "msbcustom."
)
func SyncMsbData(newServices []*models.MsbService) {
if len(cachedServices) == 0 {
deleteAllMsbRules()
}
log.Log.Debug("sync msb rewrite rule to pilot")
createServices, updateServices, deleteServices := compareServices(cachedServices, newServices)
saveService(OperationCreate, createServices)
saveService(OperationUpdate, updateServices)
saveService(OperationDelete, deleteServices)
cachedServices = newServices
}
func saveService(operation Operation, services []*models.MsbService) {
if len(services) == 0 {
log.Log.Debug("0 services need to %s. \n", operation)
return
}
configs, err := parseServiceToConfig(services)
if err != nil {
log.Log.Error("param parse error", err)
return
}
fails := Save(operation, configs)
log.Log.Debug("%d services %d rules need to %s, %d fails. \n", len(services), len(configs), operation, len(fails))
}
func deleteAllMsbRules() {
log.Log.Informational("delete all msb rules")
configs, err := List("routerules", "")
if err != nil {
log.Log.Error("fail to load rule list", err)
return
}
deleteList := msbRuleFilter(configs)
failed := Save(OperationDelete, deleteList)
log.Log.Debug("deleteAllMsbRules total %d rules, fail %d", len(configs), len(failed))
}
func msbRuleFilter(configs []istioModel.Config) []istioModel.Config {
res := make([]istioModel.Config, 0, len(configs))
for _, config := range configs {
if strings.HasPrefix(config.Name, routerulePrefix) {
res = append(res, config)
}
}
return res
}
func compareServices(oldServices, newServices []*models.MsbService) (createServices, updateServices, deleteServices []*models.MsbService) {
oldServiceMap := toServiceMap(oldServices)
newServiceMap := toServiceMap(newServices)
for key, newService := range newServiceMap {
if oldService, exist := oldServiceMap[key]; exist {
// service exist: check whether need to update
if oldService.ModifyIndex != newService.ModifyIndex {
updateServices = append(updateServices, newService)
}
} else {
// service not exist: add
createServices = append(createServices, newService)
}
delete(oldServiceMap, key)
}
for _, service := range oldServiceMap {
deleteServices = append(deleteServices, service)
}
return
}
func toServiceMap(services []*models.MsbService) map[string]*models.MsbService {
serviceMap := make(map[string]*models.MsbService)
for _, service := range services {
serviceMap[service.ServiceName] = service
}
return serviceMap
}
func parseServiceToConfig(services []*models.MsbService) ([]istioModel.Config, error) {
publishServices := getPublishServiceMap()
apiGateway := os.Getenv(models.EnvApiGatewayName)
var buf bytes.Buffer
for _, service := range services {
if publishService, exist := publishServices[getPublishServiceKey(service)]; exist {
if service.ConsulLabels.BaseInfo != nil {
rule := createRouteRule(apiGateway, publishService.PublishUrl, service.ServiceName, service.ConsulLabels.BaseInfo.Url)
buf.WriteString(rule)
}
}
}
return ParseParam(buf.String())
}
func getPublishServiceKey(svc *models.MsbService) string {
res := svc.ServiceName
if svc.ConsulLabels.BaseInfo != nil {
res += svc.ConsulLabels.BaseInfo.Version
}
if svc.ConsulLabels.NameSpace != nil {
res += svc.ConsulLabels.NameSpace.NameSpace
}
return res
}
func getPublishServiceMap() map[string]*models.PublishService {
publishServices := msb.GetAllPublishServices()
res := make(map[string]*models.PublishService)
for _, svc := range publishServices {
key := svc.ServiceName + svc.Version + svc.NameSpace
res[key] = svc
}
return res
}
func createRouteRule(sourceService, sourcePath, targetService, targetPath string) string {
if sourcePath == "" {
sourcePath = "/"
}
if targetPath == "" {
targetPath = "/"
}
// rule name must consist of lower case alphanuberic charactoers, '-' or '.'. and must start and end with an alphanumberic charactore
r := regexp.MustCompile("[a-z0-9]([-a-z0-9]*[a-z0-9])?(\\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*")
strs := r.FindAllString(targetService, -1)
name := routerulePrefix + strings.Join(strs, "")
name = strings.ToLower(name)
rule := `{
"apiVersion": "config.istio.io/v1alpha2",
"kind": "RouteRule",
"metadata": {
"name": "` + name + `"
},
"spec": {
"destination":{
"name":"` + sourceService + `"
},
"match":{
"request":{
"headers": {
"uri": {
"prefix": "` + sourcePath + `"
}
}
}
},
"rewrite": {
"uri": "` + targetPath + `"
},
"route":[
{
"destination":{
"name":"` + targetService + `"
}
}
]
}
}
`
return rule
}
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