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ping_sender.go
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/
ping_sender.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"
"github.com/uber/ringpop-go/logging"
"github.com/uber/ringpop-go/shared"
"github.com/uber/tchannel-go/json"
)
// A Ping is used as an Arg3 for the ping TChannel call / response
type ping struct {
Changes []Change `json:"changes"`
Checksum uint32 `json:"checksum"`
Source string `json:"source"`
SourceIncarnation int64 `json:"sourceIncarnationNumber"`
App string `json:"app"`
}
// sendPing sends a ping to target node that times out after timeout
func sendPing(node *Node, target string, timeout time.Duration) (*ping, error) {
changes, bumpPiggybackCounters := node.disseminator.IssueAsSender()
res, err := sendPingWithChanges(node, target, changes, timeout)
if err != nil {
return res, err
}
// when ping was successful
bumpPiggybackCounters()
return res, err
}
// sendPingWithChanges sends a special ping to the target with the given changes.
// In normal pings the disseminator is consulted to create issue the changes,
// this is not the case in this function. Only the given changes are transmitted.
func sendPingWithChanges(node *Node, target string, changes []Change, timeout time.Duration) (*ping, error) {
req := ping{
Checksum: node.memberlist.Checksum(),
Changes: changes,
Source: node.Address(),
SourceIncarnation: node.Incarnation(),
App: node.app,
}
node.EmitEvent(PingSendEvent{
Local: node.Address(),
Remote: target,
Changes: req.Changes,
})
logging.Logger("ping").WithFields(log.Fields{
"local": node.Address(),
"remote": target,
"changes": req.Changes,
}).Debug("ping send")
ctx, cancel := shared.NewTChannelContext(timeout)
defer cancel()
peer := node.channel.Peers().GetOrAdd(target)
startTime := time.Now()
// send the ping
errC := make(chan error, 1)
res := &ping{}
go func() {
errC <- json.CallPeer(ctx, peer, node.service, "/protocol/ping", req, res)
}()
// get result or timeout
var err error
select {
case err = <-errC:
case <-ctx.Done():
err = errors.New("ping timed out")
}
if err != nil {
// ping failed
logging.Logger("ping").WithFields(log.Fields{
"local": node.Address(),
"remote": target,
"error": err,
}).Debug("ping failed")
return nil, err
}
node.EmitEvent(PingSendCompleteEvent{
Local: node.Address(),
Remote: target,
Changes: req.Changes,
Duration: time.Now().Sub(startTime),
})
return res, err
}