/
grpc.go
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/
grpc.go
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// Copyright 2022 The Amesh Authors
//
// Licensed 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 provisioner
import (
"context"
"errors"
"fmt"
"strings"
"time"
"github.com/api7/gopkg/pkg/log"
clusterv3 "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3"
corev3 "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
endpointv3 "github.com/envoyproxy/go-control-plane/envoy/config/endpoint/v3"
listenerv3 "github.com/envoyproxy/go-control-plane/envoy/config/listener/v3"
routev3 "github.com/envoyproxy/go-control-plane/envoy/config/route/v3"
discoveryv3 "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3"
"go.uber.org/zap"
"google.golang.org/genproto/googleapis/rpc/code"
"google.golang.org/genproto/googleapis/rpc/status"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/known/anypb"
"github.com/api7/amesh/pkg/amesh/types"
"github.com/api7/amesh/pkg/amesh/util"
"github.com/api7/amesh/pkg/apisix"
"github.com/api7/amesh/pkg/version"
"github.com/api7/amesh/pkg/xds"
)
type xdsProvisioner struct {
src string
node *corev3.Node
logger *log.Logger
sendCh chan *discoveryv3.DiscoveryRequest
recvCh chan *discoveryv3.DiscoveryResponse
evChan chan []types.Event
resetCh chan error
// route name -> addr
// find the listener (address) owner, an extra match
// condition will be patched to the APISIX route.
// "connection_original_dst == <ip>:<port>"
routeOwnership map[string]string
// static route configuration from listeners.
staticRouteConfigurations []*routev3.RouteConfiguration
// last state of routes.
routes []*apisix.Route
// last state of upstreams.
// map is necessary since EDS requires the original cluster
// by the name.
upstreams map[string]*apisix.Upstream
// this map enrolls all clusters that require further EDS requests.
edsRequiredClusters util.StringSet
}
type Config struct {
// Running Id of this instance, it will be filled by
// a random string when the instance started.
RunId string
// The minimum log level that will be printed.
LogLevel string `json:"log_level" yaml:"log_level"`
// The destination of logs.
LogOutput string `json:"log_output" yaml:"log_output"`
// The xds source
XDSConfigSource string `json:"xds_config_source" yaml:"xds_config_source"`
Namespace string
IpAddress string
}
func NewXDSProvisioner(cfg *Config) (types.Provisioner, error) {
logger, err := log.NewLogger(
log.WithOutputFile(cfg.LogOutput),
log.WithLogLevel(cfg.LogLevel),
log.WithContext("xds-grpc-provisioner"),
)
if err != nil {
return nil, err
}
if !strings.HasPrefix(cfg.XDSConfigSource, "grpc://") {
return nil, errors.New("bad xds config source")
}
src := strings.TrimPrefix(cfg.XDSConfigSource, "grpc://")
// TODO make domain suffix configurable
dnsDomain := cfg.Namespace + ".svc.cluster.local"
node := &corev3.Node{
Id: xds.GenNodeId(cfg.RunId, cfg.IpAddress, dnsDomain),
UserAgentName: fmt.Sprintf("amesh/%s", version.Short()),
}
return &xdsProvisioner{
src: src,
node: node,
logger: logger,
sendCh: make(chan *discoveryv3.DiscoveryRequest),
recvCh: make(chan *discoveryv3.DiscoveryResponse),
evChan: make(chan []types.Event),
resetCh: make(chan error),
}, nil
}
func (p *xdsProvisioner) EventsChannel() <-chan []types.Event {
return p.evChan
}
func (p *xdsProvisioner) Run(stop <-chan struct{}) error {
p.logger.Infow("provisioner started")
defer p.logger.Info("provisioner exited")
defer close(p.evChan)
for {
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
conn, err := grpc.DialContext(ctx, p.src,
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithBlock(),
)
if err != nil {
cancel()
p.logger.Errorw("failed to conn xds source",
zap.Error(err),
zap.String("xds_source", p.src),
)
return err
}
cleanup := func() {
cancel()
if err := conn.Close(); err != nil {
p.logger.Errorw("failed to close gRPC connection to XDS config source",
zap.Error(err),
zap.String("src", p.src),
)
}
}
p.logger.Info("xds connected")
if err := p.run(ctx, conn); err != nil {
cleanup()
return err
}
select {
case <-stop:
cleanup()
return nil
case err = <-p.resetCh:
p.logger.Errorw("grpc client reset, closing",
zap.Error(err),
)
cleanup()
p.logger.Errorw("grpc client reset, try reconnect",
zap.Error(err),
)
continue
}
}
}
func (p *xdsProvisioner) run(ctx context.Context, conn *grpc.ClientConn) error {
client, err := discoveryv3.NewAggregatedDiscoveryServiceClient(conn).StreamAggregatedResources(ctx)
if err != nil {
return err
}
go p.sendLoop(ctx, client)
go p.recvLoop(ctx, client)
go p.translateLoop(ctx)
go p.firstSend()
return nil
}
func (p *xdsProvisioner) firstSend() {
dr1 := &discoveryv3.DiscoveryRequest{
Node: p.node,
TypeUrl: types.ListenerUrl,
}
dr2 := &discoveryv3.DiscoveryRequest{
Node: p.node,
TypeUrl: types.ClusterUrl,
}
//dr3 := &discoveryv3.DiscoveryRequest{
// Node: p.node,
// TypeUrl: types.RouteConfigurationUrl,
//}
p.sendCh <- dr1
p.sendCh <- dr2
p.logger.Debugw("sent initial discovery requests for listeners and clusters")
}
// sendLoop receives pending DiscoveryRequest objects and sends them to client.
// Send operation will be retried continuously until successful or the context is
// cancelled.
func (p *xdsProvisioner) sendLoop(ctx context.Context, client discoveryv3.AggregatedDiscoveryService_StreamAggregatedResourcesClient) {
for {
select {
case <-ctx.Done():
return
case dr := <-p.sendCh:
p.logger.Debugw("sending discovery request",
zap.String("type", dr.TypeUrl),
zap.Any("body", dr),
)
go func(dr *discoveryv3.DiscoveryRequest) {
if err := client.Send(dr); err != nil {
p.logger.Errorw("failed to send discovery request",
zap.Error(err),
zap.String("xds_source", p.src),
)
}
}(dr)
}
}
}
// recvLoop receives DiscoveryResponse objects from the wire stream and sends them
// to the recvCh channel.
func (p *xdsProvisioner) recvLoop(ctx context.Context, client discoveryv3.AggregatedDiscoveryService_StreamAggregatedResourcesClient) {
for {
dr, err := client.Recv()
if err != nil {
select {
case <-ctx.Done():
return
default:
p.logger.Errorw("failed to receive discovery response",
zap.Error(err),
)
errMsg := err.Error()
if strings.Contains(errMsg, "transport is closing") ||
strings.Contains(errMsg, "DeadlineExceeded") {
p.logger.Errorw("trigger grpc client reset",
zap.Error(err),
)
p.resetCh <- err
return
}
continue
}
}
//p.logger.Debugw("got discovery response",
// zap.String("type", dr.TypeUrl),
// zap.Any("body", dr),
//)
go func(dr *discoveryv3.DiscoveryResponse) {
select {
case <-ctx.Done():
case p.recvCh <- dr:
}
}(dr)
}
}
// translateLoop mediates the input DiscoveryResponse objects, translating
// them APISIX resources, and generating an ACK request ultimately.
func (p *xdsProvisioner) translateLoop(ctx context.Context) {
var verInfo string
for {
select {
case <-ctx.Done():
return
case resp := <-p.recvCh:
ackReq := &discoveryv3.DiscoveryRequest{
Node: p.node,
TypeUrl: resp.TypeUrl,
ResponseNonce: resp.Nonce,
}
if err := p.translate(resp); err != nil {
ackReq.ErrorDetail = &status.Status{
Code: int32(code.Code_INVALID_ARGUMENT),
Message: err.Error(),
}
} else {
verInfo = resp.VersionInfo
}
ackReq.VersionInfo = verInfo
p.sendCh <- ackReq
}
}
}
func (p *xdsProvisioner) translate(resp *discoveryv3.DiscoveryResponse) error {
var (
// Since the type url is fixed, only one field is filled in newManifest and oldManifest.
newManifest util.Manifest
oldManifest util.Manifest
events []types.Event
)
// As we use ADS, the TypeUrl field indicates the resource type already.
switch resp.GetTypeUrl() {
case types.RouteConfigurationUrl:
for _, res := range resp.GetResources() {
partial, err := p.processRouteConfigurationV3(res)
if err != nil {
return err
}
newManifest.Routes = append(newManifest.Routes, partial...)
}
if p.staticRouteConfigurations != nil {
partial, err := p.processStaticRouteConfigurations(p.staticRouteConfigurations)
if err != nil {
return err
}
newManifest.Routes = append(newManifest.Routes, partial...)
}
oldManifest.Routes = p.routes
p.routes = newManifest.Routes
case types.ClusterUrl:
newUps := make(map[string]*apisix.Upstream)
oldEdsRequiredClusters := p.edsRequiredClusters
p.edsRequiredClusters = util.StringSet{}
for _, res := range resp.GetResources() {
var cluster clusterv3.Cluster
err := anypb.UnmarshalTo(res, &cluster, proto.UnmarshalOptions{
DiscardUnknown: true,
})
if err != nil {
p.logger.Errorw("unmarshal cluster failed",
zap.Error(err),
zap.Any("resource", res),
)
return err
}
p.logger.Debugw("got cluster response",
zap.Any("cluster", &cluster),
)
ups, err := p.TranslateCluster(&cluster)
if err != nil {
p.logger.Warnw("failed to translate Cluster to APISIX upstreams",
zap.Error(err),
zap.Any("cluster", res),
)
continue
}
if cluster.GetType() == clusterv3.Cluster_EDS {
p.edsRequiredClusters.Add(cluster.Name)
}
newManifest.Upstreams = append(newManifest.Upstreams, ups)
newUps[ups.Name] = ups
}
// TODO Refactor util.Manifest to just use map.
for _, ups := range p.upstreams {
oldManifest.Upstreams = append(oldManifest.Upstreams, ups)
}
p.upstreams = newUps
if !p.edsRequiredClusters.Equals(oldEdsRequiredClusters) {
p.logger.Infow("new EDS discovery request",
zap.Any("old_eds_required_clusters", oldEdsRequiredClusters),
zap.Any("eds_required_clusters", p.edsRequiredClusters),
)
p.sendEds(p.edsRequiredClusters)
}
case types.ClusterLoadAssignmentUrl:
requireFurtherEds := util.StringSet{}
for _, res := range resp.GetResources() {
var cla endpointv3.ClusterLoadAssignment
err := anypb.UnmarshalTo(res, &cla, proto.UnmarshalOptions{
DiscardUnknown: true,
})
if err != nil {
p.logger.Errorw("failed to unmarshal ClusterLoadAssignment",
zap.Error(err),
zap.Any("resource", res),
)
continue
}
p.logger.Debugw("got cluster load assignment response",
zap.Any("cla", &cla),
)
ups, err := p.processClusterLoadAssignmentV3(&cla)
if err == ErrorRequireFurtherEDS {
// TODO process this
ignoredClusterName := []string{
"kubernetes.default.svc.cluster.local",
"kube-system.svc.cluster.local",
"istio-system.svc.cluster.local",
}
ignored := false
for _, clusterName := range ignoredClusterName {
if strings.Contains(cla.ClusterName, clusterName) {
ignored = true
break
}
}
if !ignored {
requireFurtherEds.Add(cla.ClusterName)
}
continue
}
if err != nil {
return err
}
p.upstreams[ups.Name] = ups
newManifest.Upstreams = append(newManifest.Upstreams, ups)
}
// TODO: FIXME: verify if this could happen when the service is dangling without pods
if len(requireFurtherEds) > 0 {
p.logger.Infow("empty endpoint, new EDS discovery request",
zap.Any("eds_required_clusters", requireFurtherEds),
)
p.sendEds(requireFurtherEds)
}
case types.ListenerUrl:
var (
rdsNames []string
staticConfigs []*routev3.RouteConfiguration
)
routeOwnership := make(map[string]string)
for _, res := range resp.GetResources() {
var listener listenerv3.Listener
if err := anypb.UnmarshalTo(res, &listener, proto.UnmarshalOptions{}); err != nil {
p.logger.Errorw("failed to unmarshal listener v3",
zap.Error(err),
zap.Any("response", res),
)
return err
}
p.logger.Debugw("got listener response",
zap.Any("listener", &listener),
)
sockAddr := listener.Address.GetSocketAddress()
if sockAddr == nil || sockAddr.GetPortValue() == 0 {
// Only use listener which listens on socket.
// TODO Support named port.
continue
}
addr := fmt.Sprintf("%s:%d", sockAddr.GetAddress(), sockAddr.GetPortValue())
names, cfgs, err := p.GetRoutesFromListener(&listener)
if err != nil {
return err
}
rdsNames = append(rdsNames, names...)
staticConfigs = append(staticConfigs, cfgs...)
for _, name := range names {
routeOwnership[name] = addr
}
for _, cfg := range cfgs {
routeOwnership[cfg.GetName()] = addr
}
}
p.staticRouteConfigurations = staticConfigs
p.routeOwnership = routeOwnership
p.sendRds(rdsNames)
default:
p.logger.Debugw("got unsupported discovery response type",
zap.String("type", resp.TypeUrl),
zap.Any("body", resp),
)
return errors.New("UnknownResourceTypeUrl")
}
// Always generate update event for EDS.
if resp.GetTypeUrl() == types.ClusterLoadAssignmentUrl {
for _, ups := range newManifest.Upstreams {
events = append(events, types.Event{
Type: types.EventUpdate,
Key: fmt.Sprintf("/upstreams/%s", ups.Id),
Object: ups,
})
}
} else {
//events = newManifest.Events(types.EventAdd)
events = p.generateIncrementalEvents(&newManifest, &oldManifest)
}
go func() {
p.evChan <- events
}()
return nil
}
func (p *xdsProvisioner) sendEds(edsRequests util.StringSet) {
// TODO: merge calls to reduce duplicate requests?
dr := &discoveryv3.DiscoveryRequest{
Node: p.node,
TypeUrl: types.ClusterLoadAssignmentUrl,
ResourceNames: edsRequests.Strings(),
}
p.logger.Debugw("sending EDS discovery request",
zap.Any("body", dr),
)
p.sendCh <- dr
}
func (p *xdsProvisioner) sendRds(rdsNames []string) {
if len(rdsNames) == 0 {
return
}
dr := &discoveryv3.DiscoveryRequest{
Node: p.node,
TypeUrl: types.RouteConfigurationUrl,
ResourceNames: rdsNames,
}
p.logger.Debugw("sending RDS discovery request",
zap.Any("body", dr),
)
p.sendCh <- dr
}
func (p *xdsProvisioner) generateIncrementalEvents(m, o *util.Manifest) []types.Event {
p.logger.Debugw("comparing old and new manifests",
zap.Any("old", o),
zap.Any("new", m),
)
var (
added *util.Manifest
deleted *util.Manifest
updated *util.Manifest
count int
)
if o == nil {
added = m
} else if m == nil {
deleted = o
} else {
added, deleted, updated = o.DiffFrom(m)
}
if added != nil {
count += added.Size()
}
if deleted != nil {
count += deleted.Size()
}
if updated != nil {
count += updated.Size()
}
if count == 0 {
p.logger.Debugw("old and new manifests are exactly same")
return nil
}
p.logger.Debugw("found changes (after converting to APISIX resources)",
zap.Any("added", added),
zap.Any("updated", updated),
zap.Any("deleted", deleted),
)
events := make([]types.Event, 0, count)
if added != nil {
events = append(events, added.Events(types.EventAdd)...)
}
if deleted != nil {
events = append(events, deleted.Events(types.EventDelete)...)
}
if updated != nil {
events = append(events, updated.Events(types.EventUpdate)...)
}
return events
}