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route.go
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route.go
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// 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 envoy
import (
"fmt"
"sort"
"time"
"github.com/envoyproxy/go-control-plane/envoy/api/v2/core"
"github.com/envoyproxy/go-control-plane/envoy/api/v2/route"
"github.com/gogo/protobuf/types"
"github.com/heptio/contour/internal/dag"
)
// RouteRoute creates a route.Route_Route for the services supplied.
// If len(services) is greater than one, the route's action will be a
// weighted cluster.
func RouteRoute(r *dag.Route, services []*dag.HTTPService) *route.Route_Route {
ra := route.RouteAction{
RetryPolicy: retryPolicy(r),
Timeout: timeout(r),
PrefixRewrite: r.PrefixRewrite,
}
if r.Websocket {
ra.UpgradeConfigs = append(ra.UpgradeConfigs,
&route.RouteAction_UpgradeConfig{
UpgradeType: "websocket",
},
)
}
switch len(services) {
case 1:
ra.ClusterSpecifier = &route.RouteAction_Cluster{
Cluster: Clustername(&services[0].TCPService),
}
ra.RequestHeadersToAdd = headers(
appendHeader("x-request-start", "t=%START_TIME(%s.%3f)%"),
)
default:
ra.ClusterSpecifier = &route.RouteAction_WeightedClusters{
WeightedClusters: weightedClusters(services),
}
}
return &route.Route_Route{
Route: &ra,
}
}
func timeout(r *dag.Route) *time.Duration {
switch r.Timeout {
case 0:
// no timeout specified
return nil
case -1:
// infinite timeout, set timeout value to a pointer to zero which tells
// envoy "infinite timeout"
return duration(0)
default:
return duration(r.Timeout)
}
}
func retryPolicy(r *dag.Route) *route.RetryPolicy {
if r.RetryOn == "" {
return nil
}
rp := &route.RetryPolicy{
RetryOn: r.RetryOn,
}
if r.NumRetries > 0 {
rp.NumRetries = u32(r.NumRetries)
}
if r.PerTryTimeout > 0 {
timeout := r.PerTryTimeout
rp.PerTryTimeout = &timeout
}
return rp
}
// UpgradeHTTPS returns a route Action that redirects the request to HTTPS.
func UpgradeHTTPS() *route.Route_Redirect {
return &route.Route_Redirect{
Redirect: &route.RedirectAction{
SchemeRewriteSpecifier: &route.RedirectAction_HttpsRedirect{
HttpsRedirect: true,
},
},
}
}
// weightedClusters returns a route.WeightedCluster for multiple services.
func weightedClusters(services []*dag.HTTPService) *route.WeightedCluster {
var wc route.WeightedCluster
var total int
for _, service := range services {
total += service.Weight
wc.Clusters = append(wc.Clusters, &route.WeightedCluster_ClusterWeight{
Name: Clustername(&service.TCPService),
Weight: u32(service.Weight),
RequestHeadersToAdd: headers(
appendHeader("x-request-start", "t=%START_TIME(%s.%3f)%"),
),
})
}
// Check if no weights were defined, if not default to even distribution
if total == 0 {
for _, c := range wc.Clusters {
c.Weight.Value = 1
}
total = len(services)
}
wc.TotalWeight = u32(total)
sort.Stable(clusterWeightByName(wc.Clusters))
return &wc
}
// PrefixMatch creates a RouteMatch for the supplied prefix.
func PrefixMatch(prefix string) route.RouteMatch {
return route.RouteMatch{
PathSpecifier: &route.RouteMatch_Prefix{
Prefix: prefix,
},
}
}
// VirtualHost creates a new route.VirtualHost.
func VirtualHost(hostname string, port int) route.VirtualHost {
domains := []string{hostname}
if hostname != "*" {
domains = append(domains, fmt.Sprintf("%s:%d", hostname, port))
}
return route.VirtualHost{
Name: hashname(60, hostname),
Domains: domains,
}
}
type clusterWeightByName []*route.WeightedCluster_ClusterWeight
func (c clusterWeightByName) Len() int { return len(c) }
func (c clusterWeightByName) Swap(i, j int) { c[i], c[j] = c[j], c[i] }
func (c clusterWeightByName) Less(i, j int) bool {
if c[i].Name == c[j].Name {
return c[i].Weight.Value < c[j].Weight.Value
}
return c[i].Name < c[j].Name
}
func headers(first *core.HeaderValueOption, rest ...*core.HeaderValueOption) []*core.HeaderValueOption {
return append([]*core.HeaderValueOption{first}, rest...)
}
func appendHeader(key, value string) *core.HeaderValueOption {
return &core.HeaderValueOption{
Header: &core.HeaderValue{
Key: key,
Value: value,
},
Append: bv(true),
}
}
func u32(val int) *types.UInt32Value { return &types.UInt32Value{Value: uint32(val)} }
var bvTrue = types.BoolValue{Value: true}
// bv returns a pointer to a true types.BoolValue if val is true,
// otherwise it returns nil.
func bv(val bool) *types.BoolValue {
if val {
return &bvTrue
}
return nil
}
func duration(d time.Duration) *time.Duration { return &d }