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service.go
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service.go
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// SPDX-FileCopyrightText: Copyright (C) 2017 Yawning Angel and David Stainton
// SPDX-License-Identifier: AGPL-3.0-only
// Package service implements the Katzenpost service node.
package service
import (
"sync"
"time"
"gopkg.in/op/go-logging.v1"
"github.com/katzenpost/katzenpost/core/worker"
"github.com/katzenpost/katzenpost/server/internal/glue"
"github.com/katzenpost/katzenpost/server/internal/instrument"
"github.com/katzenpost/katzenpost/server/internal/packet"
"github.com/katzenpost/katzenpost/server/internal/service/kaetzchen"
)
const InboundPacketsChannelSize = 1000
type serviceNode struct {
sync.Mutex
worker.Worker
glue glue.Glue
log *logging.Logger
ch chan interface{}
kaetzchenWorker *kaetzchen.KaetzchenWorker
cborPluginKaetzchenWorker *kaetzchen.CBORPluginWorker
}
func (p *serviceNode) Halt() {
p.Worker.Halt()
close(p.ch)
p.kaetzchenWorker.Halt()
p.cborPluginKaetzchenWorker.Halt()
}
func (p *serviceNode) OnPacket(pkt *packet.Packet) {
p.ch <- pkt
}
func (p *serviceNode) KaetzchenForPKI() (map[string]map[string]interface{}, error) {
map1 := p.kaetzchenWorker.KaetzchenForPKI()
map2 := p.cborPluginKaetzchenWorker.KaetzchenForPKI()
// merge sets, panic on duplicate
setsToMerge := []map[kaetzchen.PluginName]kaetzchen.PluginParameters{
map1, map2,
}
merged := make(map[kaetzchen.PluginName]kaetzchen.PluginParameters)
for _, currentSet := range setsToMerge {
for k, v := range currentSet {
if _, ok := merged[k]; ok {
p.log.Debug("WARNING: duplicate plugin entries")
panic("WARNING: duplicate plugin entries")
}
merged[k] = v
}
}
return merged, nil
}
func (p *serviceNode) worker() {
maxDwell := time.Duration(p.glue.Config().Debug.ServiceDelay) * time.Millisecond
defer p.log.Debugf("Halting Service worker.")
ch := p.ch
for {
var pkt *packet.Packet
select {
case <-p.HaltCh():
p.log.Debugf("Terminating gracefully.")
return
case e := <-ch:
pkt = e.(*packet.Packet)
if dwellTime := time.Now().Sub(pkt.DispatchAt); dwellTime > maxDwell {
p.log.Debugf("Dropping packet: %v (Spend %v in queue)", pkt.ID, dwellTime)
instrument.PacketsDropped()
pkt.Dispose()
continue
}
}
if pkt == nil {
continue
}
// Kaetzchen endpoints are published in the PKI and are never
// user-facing, so omit the recipient-post processing. If clients
// are written under the assumption that Kaetzchen addresses are
// normalized, that's their problem.
if p.kaetzchenWorker.IsKaetzchen(pkt.Recipient.ID) {
// Packet is destined for a Kaetzchen auto-responder agent, and
// can't be a SURB-Reply.
if pkt.IsSURBReply() {
p.log.Debugf("Dropping packet: %v (SURB-Reply for Kaetzchen)", pkt.ID)
instrument.PacketsDropped()
pkt.Dispose()
} else {
// Note that we pass ownership of pkt to p.kaetzchenWorker
// which will take care to dispose of it.
p.kaetzchenWorker.OnKaetzchen(pkt)
}
continue
}
if p.cborPluginKaetzchenWorker.IsKaetzchen(pkt.Recipient.ID) {
if pkt.IsSURBReply() {
p.log.Debugf("Dropping packet: %v (SURB-Reply for Kaetzchen)", pkt.ID)
instrument.PacketsDropped()
pkt.Dispose()
} else {
// Note that we pass ownership of pkt to p.kaetzchenWorker
// which will take care to dispose of it.
p.cborPluginKaetzchenWorker.OnKaetzchen(pkt)
}
continue
}
p.log.Debugf("Dropping packet: %v because recipient %x is not found", pkt.ID, pkt.Recipient.ID)
instrument.PacketsDropped()
pkt.Dispose()
}
}
// New constructs a new provider instance.
func New(glue glue.Glue) (glue.ServiceNode, error) {
kaetzchenWorker, err := kaetzchen.New(glue)
if err != nil {
return nil, err
}
cborPluginWorker, err := kaetzchen.NewCBORPluginWorker(glue)
if err != nil {
return nil, err
}
p := &serviceNode{
glue: glue,
log: glue.LogBackend().GetLogger("provider"),
ch: make(chan interface{}, InboundPacketsChannelSize),
kaetzchenWorker: kaetzchenWorker,
cborPluginKaetzchenWorker: cborPluginWorker,
}
cfg := glue.Config()
isOk := false
defer func() {
if !isOk {
p.Halt()
}
}()
// Start the workers.
for i := 0; i < cfg.Debug.NumServiceWorkers; i++ {
p.Go(p.worker)
}
isOk = true
return p, nil
}