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ping_handler.go
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/
ping_handler.go
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// Copyright (c) 2015 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package swim
import (
"errors"
"time"
log "github.com/uber-common/bark"
)
func handlePing(node *Node, req *ping) (*ping, error) {
if !node.Ready() {
node.EmitEvent(RequestBeforeReadyEvent{PingEndpoint})
return nil, ErrNodeNotReady
}
node.EmitEvent(PingReceiveEvent{
Local: node.Address(),
Source: req.Source,
Changes: req.Changes,
})
if req.App == "" {
if node.requiresAppInPing {
node.logger.WithFields(log.Fields{
"source": req.Source,
}).Warn("Rejected ping from unknown ringpop app")
return nil, errors.New("Pinged ringpop requires app name")
}
} else {
if req.App != node.app {
node.logger.WithFields(log.Fields{
"app": req.App,
"source": req.Source,
}).Warn("Rejected ping from wrong ringpop app")
return nil, errors.New("Pinged ringpop has a different app name")
}
}
node.serverRate.Mark(1)
node.totalRate.Mark(1)
node.memberlist.Update(req.Changes)
changes, fullSync :=
node.disseminator.IssueAsReceiver(req.Source, req.SourceIncarnation, req.Checksum)
res := &ping{
Checksum: node.memberlist.Checksum(),
Changes: changes,
Source: node.Address(),
SourceIncarnation: node.Incarnation(),
}
// Start bi-directional full sync.
if fullSync {
node.disseminator.tryStartReverseFullSync(req.Source, time.Second)
}
return res, nil
}