/
routes.go
644 lines (549 loc) · 19.7 KB
/
routes.go
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package xds
import (
"errors"
"fmt"
"net"
"strings"
"time"
envoy_route_v3 "github.com/envoyproxy/go-control-plane/envoy/config/route/v3"
envoy_matcher_v3 "github.com/envoyproxy/go-control-plane/envoy/type/matcher/v3"
"github.com/golang/protobuf/proto"
"github.com/golang/protobuf/ptypes"
"github.com/hashicorp/consul/agent/connect"
"github.com/hashicorp/consul/agent/proxycfg"
"github.com/hashicorp/consul/agent/structs"
)
// routesFromSnapshot returns the xDS API representation of the "routes" in the
// snapshot.
func (s *ResourceGenerator) routesFromSnapshot(cfgSnap *proxycfg.ConfigSnapshot) ([]proto.Message, error) {
if cfgSnap == nil {
return nil, errors.New("nil config given")
}
switch cfgSnap.Kind {
case structs.ServiceKindConnectProxy:
return s.routesForConnectProxy(cfgSnap.ConnectProxy.DiscoveryChain)
case structs.ServiceKindIngressGateway:
return s.routesForIngressGateway(cfgSnap.IngressGateway.Upstreams, cfgSnap.IngressGateway.DiscoveryChain)
case structs.ServiceKindTerminatingGateway:
return s.routesFromSnapshotTerminatingGateway(cfgSnap)
case structs.ServiceKindMeshGateway:
return nil, nil // mesh gateways will never have routes
default:
return nil, fmt.Errorf("Invalid service kind: %v", cfgSnap.Kind)
}
}
// routesFromSnapshotConnectProxy returns the xDS API representation of the
// "routes" in the snapshot.
func (s *ResourceGenerator) routesForConnectProxy(chains map[string]*structs.CompiledDiscoveryChain) ([]proto.Message, error) {
var resources []proto.Message
for id, chain := range chains {
if chain.IsDefault() {
continue
}
virtualHost, err := makeUpstreamRouteForDiscoveryChain(id, chain, []string{"*"})
if err != nil {
return nil, err
}
route := &envoy_route_v3.RouteConfiguration{
Name: id,
VirtualHosts: []*envoy_route_v3.VirtualHost{virtualHost},
// ValidateClusters defaults to true when defined statically and false
// when done via RDS. Re-set the sane value of true to prevent
// null-routing traffic.
ValidateClusters: makeBoolValue(true),
}
resources = append(resources, route)
}
// TODO(rb): make sure we don't generate an empty result
return resources, nil
}
// routesFromSnapshotTerminatingGateway returns the xDS API representation of the "routes" in the snapshot.
// For any HTTP service we will return a default route.
func (s *ResourceGenerator) routesFromSnapshotTerminatingGateway(cfgSnap *proxycfg.ConfigSnapshot) ([]proto.Message, error) {
if cfgSnap == nil {
return nil, errors.New("nil config given")
}
var resources []proto.Message
for _, svc := range cfgSnap.TerminatingGateway.ValidServices() {
clusterName := connect.ServiceSNI(svc.Name, "", svc.NamespaceOrDefault(), cfgSnap.Datacenter, cfgSnap.Roots.TrustDomain)
resolver, hasResolver := cfgSnap.TerminatingGateway.ServiceResolvers[svc]
svcConfig := cfgSnap.TerminatingGateway.ServiceConfigs[svc]
cfg, err := ParseProxyConfig(svcConfig.ProxyConfig)
if err != nil {
return nil, fmt.Errorf("failed to parse upstream config: %v", err)
}
if !structs.IsProtocolHTTPLike(cfg.Protocol) {
// Routes can only be defined for HTTP services
continue
}
if !hasResolver {
// Use a zero value resolver with no timeout and no subsets
resolver = &structs.ServiceResolverConfigEntry{}
}
var lb *structs.LoadBalancer
if resolver.LoadBalancer != nil {
lb = resolver.LoadBalancer
}
route, err := makeNamedDefaultRouteWithLB(clusterName, lb, true)
if err != nil {
s.Logger.Error("failed to make route", "cluster", clusterName, "error", err)
continue
}
resources = append(resources, route)
// If there is a service-resolver for this service then also setup routes for each subset
for name := range resolver.Subsets {
clusterName = connect.ServiceSNI(svc.Name, name, svc.NamespaceOrDefault(), cfgSnap.Datacenter, cfgSnap.Roots.TrustDomain)
route, err := makeNamedDefaultRouteWithLB(clusterName, lb, true)
if err != nil {
s.Logger.Error("failed to make route", "cluster", clusterName, "error", err)
continue
}
resources = append(resources, route)
}
}
return resources, nil
}
func makeNamedDefaultRouteWithLB(clusterName string, lb *structs.LoadBalancer, autoHostRewrite bool) (*envoy_route_v3.RouteConfiguration, error) {
action := makeRouteActionFromName(clusterName)
if err := injectLBToRouteAction(lb, action.Route); err != nil {
return nil, fmt.Errorf("failed to apply load balancer configuration to route action: %v", err)
}
// Configure Envoy to rewrite Host header
if autoHostRewrite {
action.Route.HostRewriteSpecifier = &envoy_route_v3.RouteAction_AutoHostRewrite{
AutoHostRewrite: makeBoolValue(true),
}
}
return &envoy_route_v3.RouteConfiguration{
Name: clusterName,
VirtualHosts: []*envoy_route_v3.VirtualHost{
{
Name: clusterName,
Domains: []string{"*"},
Routes: []*envoy_route_v3.Route{
{
Match: makeDefaultRouteMatch(),
Action: action,
},
},
},
},
// ValidateClusters defaults to true when defined statically and false
// when done via RDS. Re-set the sane value of true to prevent
// null-routing traffic.
ValidateClusters: makeBoolValue(true),
}, nil
}
// routesForIngressGateway returns the xDS API representation of the
// "routes" in the snapshot.
func (s *ResourceGenerator) routesForIngressGateway(
upstreams map[proxycfg.IngressListenerKey]structs.Upstreams,
chains map[string]*structs.CompiledDiscoveryChain,
) ([]proto.Message, error) {
var result []proto.Message
for listenerKey, upstreams := range upstreams {
// Do not create any route configuration for TCP listeners
if listenerKey.Protocol == "tcp" {
continue
}
upstreamRoute := &envoy_route_v3.RouteConfiguration{
Name: listenerKey.RouteName(),
// ValidateClusters defaults to true when defined statically and false
// when done via RDS. Re-set the sane value of true to prevent
// null-routing traffic.
ValidateClusters: makeBoolValue(true),
}
for _, u := range upstreams {
upstreamID := u.Identifier()
chain := chains[upstreamID]
if chain == nil {
continue
}
domains := generateUpstreamIngressDomains(listenerKey, u)
virtualHost, err := makeUpstreamRouteForDiscoveryChain(upstreamID, chain, domains)
if err != nil {
return nil, err
}
upstreamRoute.VirtualHosts = append(upstreamRoute.VirtualHosts, virtualHost)
}
result = append(result, upstreamRoute)
}
return result, nil
}
func generateUpstreamIngressDomains(listenerKey proxycfg.IngressListenerKey, u structs.Upstream) []string {
var domains []string
domainsSet := make(map[string]bool)
namespace := u.GetEnterpriseMeta().NamespaceOrDefault()
switch {
case len(u.IngressHosts) > 0:
// If a user has specified hosts, do not add the default
// "<service-name>.ingress.*" prefixes
domains = u.IngressHosts
case namespace != structs.IntentionDefaultNamespace:
domains = []string{fmt.Sprintf("%s.ingress.%s.*", u.DestinationName, namespace)}
default:
domains = []string{fmt.Sprintf("%s.ingress.*", u.DestinationName)}
}
for _, h := range domains {
domainsSet[h] = true
}
// Host headers may contain port numbers in them, so we need to make sure
// we match on the host with and without the port number. Well-known
// ports like HTTP/HTTPS are stripped from Host headers, but other ports
// will be in the header.
for _, h := range domains {
_, _, err := net.SplitHostPort(h)
// Error message from Go's net/ipsock.go
// We check to see if a port is not missing, and ignore the
// error from SplitHostPort otherwise, since we have previously
// validated the Host values and should trust the user's input.
if err == nil || !strings.Contains(err.Error(), "missing port in address") {
continue
}
domainWithPort := fmt.Sprintf("%s:%d", h, listenerKey.Port)
// Do not add a duplicate domain if a hostname with port is already in the
// set
if !domainsSet[domainWithPort] {
domains = append(domains, domainWithPort)
}
}
return domains
}
func makeUpstreamRouteForDiscoveryChain(
routeName string,
chain *structs.CompiledDiscoveryChain,
serviceDomains []string,
) (*envoy_route_v3.VirtualHost, error) {
var routes []*envoy_route_v3.Route
startNode := chain.Nodes[chain.StartNode]
if startNode == nil {
return nil, fmt.Errorf("missing first node in compiled discovery chain for: %s", chain.ServiceName)
}
switch startNode.Type {
case structs.DiscoveryGraphNodeTypeRouter:
routes = make([]*envoy_route_v3.Route, 0, len(startNode.Routes))
for _, discoveryRoute := range startNode.Routes {
routeMatch := makeRouteMatchForDiscoveryRoute(discoveryRoute)
var (
routeAction *envoy_route_v3.Route_Route
err error
)
nextNode := chain.Nodes[discoveryRoute.NextNode]
var lb *structs.LoadBalancer
if nextNode.LoadBalancer != nil {
lb = nextNode.LoadBalancer
}
switch nextNode.Type {
case structs.DiscoveryGraphNodeTypeSplitter:
routeAction, err = makeRouteActionForSplitter(nextNode.Splits, chain)
if err != nil {
return nil, err
}
if err := injectLBToRouteAction(lb, routeAction.Route); err != nil {
return nil, fmt.Errorf("failed to apply load balancer configuration to route action: %v", err)
}
case structs.DiscoveryGraphNodeTypeResolver:
routeAction = makeRouteActionForChainCluster(nextNode.Resolver.Target, chain)
if err := injectLBToRouteAction(lb, routeAction.Route); err != nil {
return nil, fmt.Errorf("failed to apply load balancer configuration to route action: %v", err)
}
default:
return nil, fmt.Errorf("unexpected graph node after route %q", nextNode.Type)
}
// TODO(rb): Better help handle the envoy case where you need (prefix=/foo/,rewrite=/) and (exact=/foo,rewrite=/) to do a full rewrite
destination := discoveryRoute.Definition.Destination
if destination != nil {
if destination.PrefixRewrite != "" {
routeAction.Route.PrefixRewrite = destination.PrefixRewrite
}
if destination.RequestTimeout > 0 {
routeAction.Route.Timeout = ptypes.DurationProto(destination.RequestTimeout)
}
if destination.HasRetryFeatures() {
retryPolicy := &envoy_route_v3.RetryPolicy{}
if destination.NumRetries > 0 {
retryPolicy.NumRetries = makeUint32Value(int(destination.NumRetries))
}
// The RetryOn magic values come from: https://www.envoyproxy.io/docs/envoy/v1.10.0/configuration/http_filters/router_filter#config-http-filters-router-x-envoy-retry-on
if destination.RetryOnConnectFailure {
retryPolicy.RetryOn = "connect-failure"
}
if len(destination.RetryOnStatusCodes) > 0 {
if retryPolicy.RetryOn != "" {
retryPolicy.RetryOn = retryPolicy.RetryOn + ",retriable-status-codes"
} else {
retryPolicy.RetryOn = "retriable-status-codes"
}
retryPolicy.RetriableStatusCodes = destination.RetryOnStatusCodes
}
routeAction.Route.RetryPolicy = retryPolicy
}
}
routes = append(routes, &envoy_route_v3.Route{
Match: routeMatch,
Action: routeAction,
})
}
case structs.DiscoveryGraphNodeTypeSplitter:
routeAction, err := makeRouteActionForSplitter(startNode.Splits, chain)
if err != nil {
return nil, err
}
var lb *structs.LoadBalancer
if startNode.LoadBalancer != nil {
lb = startNode.LoadBalancer
}
if err := injectLBToRouteAction(lb, routeAction.Route); err != nil {
return nil, fmt.Errorf("failed to apply load balancer configuration to route action: %v", err)
}
defaultRoute := &envoy_route_v3.Route{
Match: makeDefaultRouteMatch(),
Action: routeAction,
}
routes = []*envoy_route_v3.Route{defaultRoute}
case structs.DiscoveryGraphNodeTypeResolver:
routeAction := makeRouteActionForChainCluster(startNode.Resolver.Target, chain)
var lb *structs.LoadBalancer
if startNode.LoadBalancer != nil {
lb = startNode.LoadBalancer
}
if err := injectLBToRouteAction(lb, routeAction.Route); err != nil {
return nil, fmt.Errorf("failed to apply load balancer configuration to route action: %v", err)
}
defaultRoute := &envoy_route_v3.Route{
Match: makeDefaultRouteMatch(),
Action: routeAction,
}
routes = []*envoy_route_v3.Route{defaultRoute}
default:
return nil, fmt.Errorf("unknown first node in discovery chain of type: %s", startNode.Type)
}
host := &envoy_route_v3.VirtualHost{
Name: routeName,
Domains: serviceDomains,
Routes: routes,
}
return host, nil
}
func makeRouteMatchForDiscoveryRoute(discoveryRoute *structs.DiscoveryRoute) *envoy_route_v3.RouteMatch {
match := discoveryRoute.Definition.Match
if match == nil || match.IsEmpty() {
return makeDefaultRouteMatch()
}
em := &envoy_route_v3.RouteMatch{}
switch {
case match.HTTP.PathExact != "":
em.PathSpecifier = &envoy_route_v3.RouteMatch_Path{
Path: match.HTTP.PathExact,
}
case match.HTTP.PathPrefix != "":
em.PathSpecifier = &envoy_route_v3.RouteMatch_Prefix{
Prefix: match.HTTP.PathPrefix,
}
case match.HTTP.PathRegex != "":
em.PathSpecifier = &envoy_route_v3.RouteMatch_SafeRegex{
SafeRegex: makeEnvoyRegexMatch(match.HTTP.PathRegex),
}
default:
em.PathSpecifier = &envoy_route_v3.RouteMatch_Prefix{
Prefix: "/",
}
}
if len(match.HTTP.Header) > 0 {
em.Headers = make([]*envoy_route_v3.HeaderMatcher, 0, len(match.HTTP.Header))
for _, hdr := range match.HTTP.Header {
eh := &envoy_route_v3.HeaderMatcher{
Name: hdr.Name,
}
switch {
case hdr.Exact != "":
eh.HeaderMatchSpecifier = &envoy_route_v3.HeaderMatcher_ExactMatch{
ExactMatch: hdr.Exact,
}
case hdr.Regex != "":
eh.HeaderMatchSpecifier = &envoy_route_v3.HeaderMatcher_SafeRegexMatch{
SafeRegexMatch: makeEnvoyRegexMatch(hdr.Regex),
}
case hdr.Prefix != "":
eh.HeaderMatchSpecifier = &envoy_route_v3.HeaderMatcher_PrefixMatch{
PrefixMatch: hdr.Prefix,
}
case hdr.Suffix != "":
eh.HeaderMatchSpecifier = &envoy_route_v3.HeaderMatcher_SuffixMatch{
SuffixMatch: hdr.Suffix,
}
case hdr.Present:
eh.HeaderMatchSpecifier = &envoy_route_v3.HeaderMatcher_PresentMatch{
PresentMatch: true,
}
default:
continue // skip this impossible situation
}
if hdr.Invert {
eh.InvertMatch = true
}
em.Headers = append(em.Headers, eh)
}
}
if len(match.HTTP.Methods) > 0 {
methodHeaderRegex := strings.Join(match.HTTP.Methods, "|")
eh := &envoy_route_v3.HeaderMatcher{
Name: ":method",
HeaderMatchSpecifier: &envoy_route_v3.HeaderMatcher_SafeRegexMatch{
SafeRegexMatch: makeEnvoyRegexMatch(methodHeaderRegex),
},
}
em.Headers = append(em.Headers, eh)
}
if len(match.HTTP.QueryParam) > 0 {
em.QueryParameters = make([]*envoy_route_v3.QueryParameterMatcher, 0, len(match.HTTP.QueryParam))
for _, qm := range match.HTTP.QueryParam {
eq := &envoy_route_v3.QueryParameterMatcher{
Name: qm.Name,
}
switch {
case qm.Exact != "":
eq.QueryParameterMatchSpecifier = &envoy_route_v3.QueryParameterMatcher_StringMatch{
StringMatch: &envoy_matcher_v3.StringMatcher{
MatchPattern: &envoy_matcher_v3.StringMatcher_Exact{
Exact: qm.Exact,
},
},
}
case qm.Regex != "":
eq.QueryParameterMatchSpecifier = &envoy_route_v3.QueryParameterMatcher_StringMatch{
StringMatch: &envoy_matcher_v3.StringMatcher{
MatchPattern: &envoy_matcher_v3.StringMatcher_SafeRegex{
SafeRegex: makeEnvoyRegexMatch(qm.Regex),
},
},
}
case qm.Present:
eq.QueryParameterMatchSpecifier = &envoy_route_v3.QueryParameterMatcher_PresentMatch{
PresentMatch: true,
}
default:
continue // skip this impossible situation
}
em.QueryParameters = append(em.QueryParameters, eq)
}
}
return em
}
func makeDefaultRouteMatch() *envoy_route_v3.RouteMatch {
return &envoy_route_v3.RouteMatch{
PathSpecifier: &envoy_route_v3.RouteMatch_Prefix{
Prefix: "/",
},
// TODO(banks) Envoy supports matching only valid GRPC
// requests which might be nice to add here for gRPC services
// but it's not supported in our current envoy SDK version
// although docs say it was supported by 1.8.0. Going to defer
// that until we've updated the deps.
}
}
func makeRouteActionForChainCluster(targetID string, chain *structs.CompiledDiscoveryChain) *envoy_route_v3.Route_Route {
target := chain.Targets[targetID]
return makeRouteActionFromName(CustomizeClusterName(target.Name, chain))
}
func makeRouteActionFromName(clusterName string) *envoy_route_v3.Route_Route {
return &envoy_route_v3.Route_Route{
Route: &envoy_route_v3.RouteAction{
ClusterSpecifier: &envoy_route_v3.RouteAction_Cluster{
Cluster: clusterName,
},
},
}
}
func makeRouteActionForSplitter(splits []*structs.DiscoverySplit, chain *structs.CompiledDiscoveryChain) (*envoy_route_v3.Route_Route, error) {
clusters := make([]*envoy_route_v3.WeightedCluster_ClusterWeight, 0, len(splits))
for _, split := range splits {
nextNode := chain.Nodes[split.NextNode]
if nextNode.Type != structs.DiscoveryGraphNodeTypeResolver {
return nil, fmt.Errorf("unexpected splitter destination node type: %s", nextNode.Type)
}
targetID := nextNode.Resolver.Target
target := chain.Targets[targetID]
clusterName := CustomizeClusterName(target.Name, chain)
// The smallest representable weight is 1/10000 or .01% but envoy
// deals with integers so scale everything up by 100x.
cw := &envoy_route_v3.WeightedCluster_ClusterWeight{
Weight: makeUint32Value(int(split.Weight * 100)),
Name: clusterName,
}
clusters = append(clusters, cw)
}
return &envoy_route_v3.Route_Route{
Route: &envoy_route_v3.RouteAction{
ClusterSpecifier: &envoy_route_v3.RouteAction_WeightedClusters{
WeightedClusters: &envoy_route_v3.WeightedCluster{
Clusters: clusters,
TotalWeight: makeUint32Value(10000), // scaled up 100%
},
},
},
}, nil
}
func injectLBToRouteAction(lb *structs.LoadBalancer, action *envoy_route_v3.RouteAction) error {
if lb == nil || !lb.IsHashBased() {
return nil
}
result := make([]*envoy_route_v3.RouteAction_HashPolicy, 0, len(lb.HashPolicies))
for _, policy := range lb.HashPolicies {
if policy.SourceIP {
result = append(result, &envoy_route_v3.RouteAction_HashPolicy{
PolicySpecifier: &envoy_route_v3.RouteAction_HashPolicy_ConnectionProperties_{
ConnectionProperties: &envoy_route_v3.RouteAction_HashPolicy_ConnectionProperties{
SourceIp: true,
},
},
Terminal: policy.Terminal,
})
continue
}
switch policy.Field {
case structs.HashPolicyHeader:
result = append(result, &envoy_route_v3.RouteAction_HashPolicy{
PolicySpecifier: &envoy_route_v3.RouteAction_HashPolicy_Header_{
Header: &envoy_route_v3.RouteAction_HashPolicy_Header{
HeaderName: policy.FieldValue,
},
},
Terminal: policy.Terminal,
})
case structs.HashPolicyCookie:
cookie := envoy_route_v3.RouteAction_HashPolicy_Cookie{
Name: policy.FieldValue,
}
if policy.CookieConfig != nil {
cookie.Path = policy.CookieConfig.Path
if policy.CookieConfig.TTL != 0*time.Second {
cookie.Ttl = ptypes.DurationProto(policy.CookieConfig.TTL)
}
// Envoy will generate a session cookie if the ttl is present and zero.
if policy.CookieConfig.Session {
cookie.Ttl = ptypes.DurationProto(0 * time.Second)
}
}
result = append(result, &envoy_route_v3.RouteAction_HashPolicy{
PolicySpecifier: &envoy_route_v3.RouteAction_HashPolicy_Cookie_{
Cookie: &cookie,
},
Terminal: policy.Terminal,
})
case structs.HashPolicyQueryParam:
result = append(result, &envoy_route_v3.RouteAction_HashPolicy{
PolicySpecifier: &envoy_route_v3.RouteAction_HashPolicy_QueryParameter_{
QueryParameter: &envoy_route_v3.RouteAction_HashPolicy_QueryParameter{
Name: policy.FieldValue,
},
},
Terminal: policy.Terminal,
})
default:
return fmt.Errorf("unsupported load balancer hash policy field: %v", policy.Field)
}
}
action.HashPolicy = result
return nil
}