open-consul/agent/proxycfg/upstreams.go

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package proxycfg
import (
"context"
"fmt"
"strings"
"time"
"github.com/mitchellh/mapstructure"
"github.com/hashicorp/consul/agent/cache"
"github.com/hashicorp/consul/agent/connect"
cachetype "github.com/hashicorp/consul/agent/cache-types"
"github.com/hashicorp/consul/agent/structs"
)
type handlerUpstreams struct {
handlerState
}
func (s *handlerUpstreams) handleUpdateUpstreams(ctx context.Context, u cache.UpdateEvent, snap *ConfigSnapshot) error {
if u.Err != nil {
return fmt.Errorf("error filling agent cache: %v", u.Err)
}
upstreamsSnapshot := &snap.ConnectProxy.ConfigSnapshotUpstreams
if snap.Kind == structs.ServiceKindIngressGateway {
upstreamsSnapshot = &snap.IngressGateway.ConfigSnapshotUpstreams
}
switch {
case u.CorrelationID == leafWatchID:
leaf, ok := u.Result.(*structs.IssuedCert)
if !ok {
return fmt.Errorf("invalid type for response: %T", u.Result)
}
upstreamsSnapshot.Leaf = leaf
case strings.HasPrefix(u.CorrelationID, "discovery-chain:"):
resp, ok := u.Result.(*structs.DiscoveryChainResponse)
if !ok {
return fmt.Errorf("invalid type for response: %T", u.Result)
}
svc := strings.TrimPrefix(u.CorrelationID, "discovery-chain:")
upstreamsSnapshot.DiscoveryChain[svc] = resp.Chain
if err := s.resetWatchesFromChain(ctx, svc, resp.Chain, upstreamsSnapshot); err != nil {
return err
}
case strings.HasPrefix(u.CorrelationID, "upstream-target:"):
resp, ok := u.Result.(*structs.IndexedCheckServiceNodes)
if !ok {
return fmt.Errorf("invalid type for response: %T", u.Result)
}
correlationID := strings.TrimPrefix(u.CorrelationID, "upstream-target:")
targetID, svc, ok := removeColonPrefix(correlationID)
if !ok {
return fmt.Errorf("invalid correlation id %q", u.CorrelationID)
}
if _, ok := upstreamsSnapshot.WatchedUpstreamEndpoints[svc]; !ok {
upstreamsSnapshot.WatchedUpstreamEndpoints[svc] = make(map[string]structs.CheckServiceNodes)
}
upstreamsSnapshot.WatchedUpstreamEndpoints[svc][targetID] = resp.Nodes
var passthroughAddrs map[string]ServicePassthroughAddrs
for _, node := range resp.Nodes {
if snap.Proxy.Mode == structs.ProxyModeTransparent && node.Service.Proxy.TransparentProxy.DialedDirectly {
if passthroughAddrs == nil {
passthroughAddrs = make(map[string]ServicePassthroughAddrs)
}
svc := node.Service.CompoundServiceName()
// Overwrite the name if it's a connect proxy (as opposed to Connect native).
// We don't reference the proxy name directly for things like SNI, but rather the name
// of the destination. The enterprise meta of a proxy will always be the same as that of
// the destination service, so that remains intact.
if node.Service.Kind == structs.ServiceKindConnectProxy {
dst := node.Service.Proxy.DestinationServiceName
if dst == "" {
dst = node.Service.Proxy.DestinationServiceID
}
svc.Name = dst
}
sni := connect.ServiceSNI(
svc.Name,
"",
svc.NamespaceOrDefault(),
snap.Datacenter,
snap.Roots.TrustDomain)
if _, ok := upstreamsSnapshot.PassthroughUpstreams[svc.String()]; !ok {
upstreamsSnapshot.PassthroughUpstreams[svc.String()] = ServicePassthroughAddrs{
SNI: sni,
// Stored in a set because it's possible for these to be duplicated
// when the upstream-target is targeted by multiple discovery chains.
Addrs: make(map[string]struct{}),
}
}
addr, _ := node.BestAddress(false)
upstreamsSnapshot.PassthroughUpstreams[svc.String()].Addrs[addr] = struct{}{}
}
}
case strings.HasPrefix(u.CorrelationID, "mesh-gateway:"):
resp, ok := u.Result.(*structs.IndexedNodesWithGateways)
if !ok {
return fmt.Errorf("invalid type for response: %T", u.Result)
}
correlationID := strings.TrimPrefix(u.CorrelationID, "mesh-gateway:")
dc, svc, ok := removeColonPrefix(correlationID)
if !ok {
return fmt.Errorf("invalid correlation id %q", u.CorrelationID)
}
if _, ok = upstreamsSnapshot.WatchedGatewayEndpoints[svc]; !ok {
upstreamsSnapshot.WatchedGatewayEndpoints[svc] = make(map[string]structs.CheckServiceNodes)
}
upstreamsSnapshot.WatchedGatewayEndpoints[svc][dc] = resp.Nodes
default:
return fmt.Errorf("unknown correlation ID: %s", u.CorrelationID)
}
return nil
}
func removeColonPrefix(s string) (string, string, bool) {
idx := strings.Index(s, ":")
if idx == -1 {
return "", "", false
}
return s[0:idx], s[idx+1:], true
}
func (s *handlerUpstreams) resetWatchesFromChain(
ctx context.Context,
id string,
chain *structs.CompiledDiscoveryChain,
snap *ConfigSnapshotUpstreams,
) error {
s.logger.Trace("resetting watches for discovery chain", "id", id)
if chain == nil {
return fmt.Errorf("not possible to arrive here with no discovery chain")
}
// Initialize relevant sub maps.
if _, ok := snap.WatchedUpstreams[id]; !ok {
snap.WatchedUpstreams[id] = make(map[string]context.CancelFunc)
}
if _, ok := snap.WatchedUpstreamEndpoints[id]; !ok {
snap.WatchedUpstreamEndpoints[id] = make(map[string]structs.CheckServiceNodes)
}
if _, ok := snap.WatchedGateways[id]; !ok {
snap.WatchedGateways[id] = make(map[string]context.CancelFunc)
}
if _, ok := snap.WatchedGatewayEndpoints[id]; !ok {
snap.WatchedGatewayEndpoints[id] = make(map[string]structs.CheckServiceNodes)
}
// We could invalidate this selectively based on a hash of the relevant
// resolver information, but for now just reset anything about this
// upstream when the chain changes in any way.
//
// TODO(rb): content hash based add/remove
for targetID, cancelFn := range snap.WatchedUpstreams[id] {
s.logger.Trace("stopping watch of target",
"upstream", id,
"chain", chain.ServiceName,
"target", targetID,
)
delete(snap.WatchedUpstreams[id], targetID)
delete(snap.WatchedUpstreamEndpoints[id], targetID)
cancelFn()
}
var (
watchedChainEndpoints bool
needGateways = make(map[string]struct{})
)
chainID := chain.ID()
for _, target := range chain.Targets {
if target.ID == chainID {
watchedChainEndpoints = true
}
opts := targetWatchOpts{
upstreamID: id,
chainID: target.ID,
service: target.Service,
filter: target.Subset.Filter,
datacenter: target.Datacenter,
entMeta: target.GetEnterpriseMetadata(),
}
err := s.watchUpstreamTarget(ctx, snap, opts)
if err != nil {
return fmt.Errorf("failed to watch target %q for upstream %q", target.ID, id)
}
// We'll get endpoints from the gateway query, but the health still has
// to come from the backing service query.
switch target.MeshGateway.Mode {
case structs.MeshGatewayModeRemote:
needGateways[target.Datacenter] = struct{}{}
case structs.MeshGatewayModeLocal:
needGateways[s.source.Datacenter] = struct{}{}
}
}
// If the discovery chain's targets do not lead to watching all endpoints
// for the upstream, then create a separate watch for those too.
// This is needed in transparent mode because if there is some service A that
// redirects to service B, the dialing proxy needs to associate A's virtual IP
// with A's discovery chain.
//
// Outside of transparent mode we only watch the chain target, B,
// since A is a virtual service and traffic will not be sent to it.
if !watchedChainEndpoints && s.proxyCfg.Mode == structs.ProxyModeTransparent {
chainEntMeta := structs.NewEnterpriseMeta(chain.Namespace)
opts := targetWatchOpts{
upstreamID: id,
chainID: chainID,
service: chain.ServiceName,
filter: "",
datacenter: chain.Datacenter,
entMeta: &chainEntMeta,
}
err := s.watchUpstreamTarget(ctx, snap, opts)
if err != nil {
return fmt.Errorf("failed to watch target %q for upstream %q", chainID, id)
}
}
for dc := range needGateways {
if _, ok := snap.WatchedGateways[id][dc]; ok {
continue
}
s.logger.Trace("initializing watch of mesh gateway in datacenter",
"upstream", id,
"chain", chain.ServiceName,
"datacenter", dc,
)
ctx, cancel := context.WithCancel(ctx)
err := s.watchMeshGateway(ctx, dc, id)
if err != nil {
cancel()
return err
}
snap.WatchedGateways[id][dc] = cancel
}
for dc, cancelFn := range snap.WatchedGateways[id] {
if _, ok := needGateways[dc]; ok {
continue
}
s.logger.Trace("stopping watch of mesh gateway in datacenter",
"upstream", id,
"chain", chain.ServiceName,
"datacenter", dc,
)
delete(snap.WatchedGateways[id], dc)
delete(snap.WatchedGatewayEndpoints[id], dc)
cancelFn()
}
return nil
}
type targetWatchOpts struct {
upstreamID string
chainID string
service string
filter string
datacenter string
entMeta *structs.EnterpriseMeta
}
func (s *handlerUpstreams) watchMeshGateway(ctx context.Context, dc string, upstreamID string) error {
return s.cache.Notify(ctx, cachetype.InternalServiceDumpName, &structs.ServiceDumpRequest{
Datacenter: dc,
QueryOptions: structs.QueryOptions{Token: s.token},
ServiceKind: structs.ServiceKindMeshGateway,
UseServiceKind: true,
Source: *s.source,
EnterpriseMeta: *structs.DefaultEnterpriseMeta(),
}, "mesh-gateway:"+dc+":"+upstreamID, s.ch)
}
func (s *handlerUpstreams) watchUpstreamTarget(ctx context.Context, snap *ConfigSnapshotUpstreams, opts targetWatchOpts) error {
s.logger.Trace("initializing watch of target",
"upstream", opts.upstreamID,
"chain", opts.service,
"target", opts.chainID,
)
var finalMeta structs.EnterpriseMeta
finalMeta.Merge(opts.entMeta)
correlationID := "upstream-target:" + opts.chainID + ":" + opts.upstreamID
ctx, cancel := context.WithCancel(ctx)
err := s.health.Notify(ctx, structs.ServiceSpecificRequest{
Datacenter: opts.datacenter,
QueryOptions: structs.QueryOptions{
Token: s.token,
Filter: opts.filter,
},
ServiceName: opts.service,
Connect: true,
// Note that Identifier doesn't type-prefix for service any more as it's
// the default and makes metrics and other things much cleaner. It's
// simpler for us if we have the type to make things unambiguous.
Source: *s.source,
EnterpriseMeta: finalMeta,
}, correlationID, s.ch)
if err != nil {
cancel()
return err
}
snap.WatchedUpstreams[opts.upstreamID][opts.chainID] = cancel
return nil
}
type discoveryChainWatchOpts struct {
id string
name string
namespace string
datacenter string
cfg reducedUpstreamConfig
meshGateway structs.MeshGatewayConfig
}
func (s *handlerUpstreams) watchDiscoveryChain(ctx context.Context, snap *ConfigSnapshot, opts discoveryChainWatchOpts) error {
if _, ok := snap.ConnectProxy.WatchedDiscoveryChains[opts.id]; ok {
return nil
}
ctx, cancel := context.WithCancel(ctx)
err := s.cache.Notify(ctx, cachetype.CompiledDiscoveryChainName, &structs.DiscoveryChainRequest{
Datacenter: s.source.Datacenter,
QueryOptions: structs.QueryOptions{Token: s.token},
Name: opts.name,
EvaluateInDatacenter: opts.datacenter,
EvaluateInNamespace: opts.namespace,
OverrideProtocol: opts.cfg.Protocol,
OverrideConnectTimeout: opts.cfg.ConnectTimeout(),
OverrideMeshGateway: opts.meshGateway,
}, "discovery-chain:"+opts.id, s.ch)
if err != nil {
cancel()
return err
}
switch s.kind {
case structs.ServiceKindIngressGateway:
snap.IngressGateway.WatchedDiscoveryChains[opts.id] = cancel
case structs.ServiceKindConnectProxy:
snap.ConnectProxy.WatchedDiscoveryChains[opts.id] = cancel
default:
cancel()
return fmt.Errorf("unsupported kind %s", s.kind)
}
return nil
}
// reducedUpstreamConfig represents the basic opaque config values that are now
// managed with the discovery chain but for backwards compatibility reasons
// should still affect how the proxy is configured.
//
// The full-blown config is agent/xds.UpstreamConfig
type reducedUpstreamConfig struct {
Protocol string `mapstructure:"protocol"`
ConnectTimeoutMs int `mapstructure:"connect_timeout_ms"`
}
func (c *reducedUpstreamConfig) ConnectTimeout() time.Duration {
return time.Duration(c.ConnectTimeoutMs) * time.Millisecond
}
func parseReducedUpstreamConfig(m map[string]interface{}) (reducedUpstreamConfig, error) {
var cfg reducedUpstreamConfig
err := mapstructure.WeakDecode(m, &cfg)
return cfg, err
}