| /* |
| * 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. |
| */ |
| |
| package datareq |
| |
| import ( |
| "fmt" |
| "net/http" |
| "net/url" |
| |
| "github.com/apache/trafficcontrol/lib/go-log" |
| "github.com/apache/trafficcontrol/lib/go-tc" |
| "github.com/apache/trafficcontrol/traffic_monitor/peer" |
| ) |
| |
| func srvTRState( |
| params url.Values, |
| localStates peer.CRStatesThreadsafe, |
| combinedStates peer.CRStatesThreadsafe, |
| peerStates peer.CRStatesPeersThreadsafe, |
| distributedPollingEnabled bool, |
| ) ([]byte, int, error) { |
| _, raw := params["raw"] // peer polling case |
| _, local := params["local"] // distributed peer polling case |
| if raw { |
| data, err := srvTRStateSelf(localStates, distributedPollingEnabled) |
| return data, http.StatusOK, err |
| } |
| |
| // This covers the case where we have lost connectivity to all peers, but multiple peers exist. In this case, it is |
| // more likely that the local machine has lost all connectivity than both peers losing connectivity or crashing. If |
| // the peers really did crash, the health protocol is essentially broken, and serving a 503 will cause Traffic Router |
| // to use the last good state fetched from a Traffic Monitor within the CDN. If the peers are simply unreachable from |
| // this Traffic Monitor, serving 503s until connectivity is restored will cause Traffic Router to ignore this instance |
| // until the health protocol can be relied upon once again. |
| if peerStates.OptimisticQuorumEnabled() { |
| optimisticQuorum, peersAvailable, peerCount, minimum := peerStates.HasOptimisticQuorum() |
| log.Debugf("optimisticQuorum=%v, peerCount=%v, peersAvailable=%v, minimum=%v", optimisticQuorum, peerCount, peersAvailable, minimum) |
| |
| if !optimisticQuorum { |
| return nil, http.StatusServiceUnavailable, fmt.Errorf("number of peers available (%d/%d) is less than the minimum number of %d required for optimistic peer quorum", peersAvailable, peerCount, minimum) |
| } |
| } |
| |
| data, err := srvTRStateDerived(combinedStates, local && distributedPollingEnabled) |
| |
| return data, http.StatusOK, err |
| } |
| |
| func srvTRStateDerived(combinedStates peer.CRStatesThreadsafe, directlyPolledOnly bool) ([]byte, error) { |
| if !directlyPolledOnly { |
| return tc.CRStatesMarshall(combinedStates.Get()) |
| } |
| unfiltered := combinedStates.Get() |
| return tc.CRStatesMarshall(filterDirectlyPolledCaches(unfiltered)) |
| } |
| |
| func filterDirectlyPolledCaches(crstates tc.CRStates) tc.CRStates { |
| filtered := tc.CRStates{ |
| Caches: make(map[tc.CacheName]tc.IsAvailable), |
| DeliveryService: crstates.DeliveryService, |
| } |
| for cacheName, availability := range crstates.Caches { |
| if availability.DirectlyPolled { |
| filtered.Caches[cacheName] = availability |
| } |
| } |
| return filtered |
| } |
| |
| func srvTRStateSelf(localStates peer.CRStatesThreadsafe, directlyPolledOnly bool) ([]byte, error) { |
| if !directlyPolledOnly { |
| return tc.CRStatesMarshall(localStates.Get()) |
| } |
| unfiltered := localStates.Get() |
| return tc.CRStatesMarshall(filterDirectlyPolledCaches(unfiltered)) |
| } |