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ping_request_handler.go
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/
ping_request_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 "time"
// A PingResponse is the response from a successful ping request call
type pingResponse struct {
Ok bool `json:"pingStatus"`
Target string `json:"target"`
Changes []Change `json:"changes"`
}
func handlePingRequest(node *Node, req *pingRequest) (*pingResponse, error) {
if !node.Ready() {
node.EmitEvent(RequestBeforeReadyEvent{PingReqEndpoint})
return nil, ErrNodeNotReady
}
node.EmitEvent(PingRequestReceiveEvent{
Local: node.Address(),
Source: req.Source,
Target: req.Target,
Changes: req.Changes,
})
node.serverRate.Mark(1)
node.totalRate.Mark(1)
node.memberlist.Update(req.Changes)
pingStartTime := time.Now()
res, err := sendPing(node, req.Target, node.pingTimeout)
pingOk := err == nil
if pingOk {
node.EmitEvent(PingRequestPingEvent{
Local: node.Address(),
Source: req.Source,
Target: req.Target,
Duration: time.Now().Sub(pingStartTime),
})
node.memberlist.Update(res.Changes)
}
changes, _ :=
node.disseminator.IssueAsReceiver(req.Source, req.SourceIncarnation, req.Checksum)
// ignore full sync
return &pingResponse{
Target: req.Target,
Ok: pingOk,
Changes: changes,
}, nil
}