/
crstatespoller.go
106 lines (92 loc) · 3.2 KB
/
crstatespoller.go
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package crstatespoller
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*
*/
import (
"bytes"
"encoding/json"
"fmt"
"time"
"github.com/apache/trafficcontrol/experimental/traffic_router_golang/availableservers"
"github.com/apache/trafficcontrol/experimental/traffic_router_golang/crconfig"
"github.com/apache/trafficcontrol/experimental/traffic_router_golang/crstates"
"github.com/apache/trafficcontrol/experimental/traffic_router_golang/fetch"
"github.com/apache/trafficcontrol/lib/go-tc"
)
func updateAvailableServers(crcThs crconfig.Ths, crsThs crstates.Ths, as availableservers.AvailableServers) {
newAS := map[tc.DeliveryServiceName]map[tc.CacheGroupName][]tc.CacheName{}
crc := crcThs.Get()
crs := crsThs.Get()
for serverNameStr, server := range crc.ContentServers {
serverName := tc.CacheName(serverNameStr)
if !crs.Caches[serverName].IsAvailable {
continue
}
if server.CacheGroup == nil {
fmt.Println("ERROR updateAvailableServers CRConfig server " + serverNameStr + " cachegroup is nil")
continue
}
cgName := tc.CacheGroupName(*server.CacheGroup)
for dsNameStr, _ := range server.DeliveryServices {
dsName := tc.DeliveryServiceName(dsNameStr)
if newAS[dsName] == nil {
newAS[dsName] = map[tc.CacheGroupName][]tc.CacheName{}
}
newAS[dsName][cgName] = append(newAS[dsName][cgName], serverName)
}
}
fmt.Println("updateAvailableServers setting new ", newAS)
as.Set(newAS)
}
// TODO implement HTTP poller
func Start(fetcher fetch.Fetcher, interval time.Duration, crc crconfig.Ths) (crstates.Ths, availableservers.AvailableServers, error) {
thsCrs := crstates.NewThs()
availableServers := availableservers.New()
prevBts := []byte{}
get := func() {
newBts, err := fetcher.Fetch()
if err != nil {
fmt.Println("ERROR CRStates read error: " + err.Error())
return
}
if bytes.Equal(newBts, prevBts) {
fmt.Println("INFO CRStates unchanged.")
return
}
fmt.Println("INFO CRStates changed.")
crs := &tc.CRStates{}
if err := json.Unmarshal(newBts, crs); err != nil {
fmt.Println("ERROR CRStates unmarshalling: " + err.Error())
return
}
thsCrs.Set(crs)
prevBts = newBts
updateAvailableServers(crc, thsCrs, availableServers) // TODO update AvailableServers when CRStates OR CRConfig is update, via channel and manager goroutine?
fmt.Println("INFO CRStates set new")
// TODO update AvailableServers
}
get()
go func() {
for {
time.Sleep(interval)
get()
}
}()
return thsCrs, availableServers, nil
}