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bootstrap.go
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bootstrap.go
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// Copyright © 2019 Heptio
// 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 (
"log"
"strconv"
"strings"
"time"
api "github.com/envoyproxy/go-control-plane/envoy/api/v2"
"github.com/envoyproxy/go-control-plane/envoy/api/v2/auth"
clusterv2 "github.com/envoyproxy/go-control-plane/envoy/api/v2/cluster"
"github.com/envoyproxy/go-control-plane/envoy/api/v2/core"
bootstrap "github.com/envoyproxy/go-control-plane/envoy/config/bootstrap/v2"
)
// Bootstrap creates a new v2 Bootstrap configuration.
func Bootstrap(c *BootstrapConfig) *bootstrap.Bootstrap {
b := &bootstrap.Bootstrap{
DynamicResources: &bootstrap.Bootstrap_DynamicResources{
LdsConfig: ConfigSource("contour"),
CdsConfig: ConfigSource("contour"),
},
StaticResources: &bootstrap.Bootstrap_StaticResources{
Clusters: []api.Cluster{{
Name: "contour",
AltStatName: strings.Join([]string{c.Namespace, "contour", strconv.Itoa(c.xdsGRPCPort())}, "_"),
ConnectTimeout: 5 * time.Second,
ClusterDiscoveryType: ClusterDiscoveryType(api.Cluster_STRICT_DNS),
LbPolicy: api.Cluster_ROUND_ROBIN,
LoadAssignment: &api.ClusterLoadAssignment{
ClusterName: "contour",
Endpoints: Endpoints(
SocketAddress(c.xdsAddress(), c.xdsGRPCPort()),
),
},
Http2ProtocolOptions: new(core.Http2ProtocolOptions), // enables http2
UpstreamConnectionOptions: &api.UpstreamConnectionOptions{
TcpKeepalive: &core.TcpKeepalive{
KeepaliveProbes: u32(3),
KeepaliveTime: u32(30),
KeepaliveInterval: u32(5),
},
},
CircuitBreakers: &clusterv2.CircuitBreakers{
Thresholds: []*clusterv2.CircuitBreakers_Thresholds{{
Priority: core.RoutingPriority_HIGH,
MaxConnections: u32(100000),
MaxPendingRequests: u32(100000),
MaxRequests: u32(60000000),
MaxRetries: u32(50),
}, {
Priority: core.RoutingPriority_DEFAULT,
MaxConnections: u32(100000),
MaxPendingRequests: u32(100000),
MaxRequests: u32(60000000),
MaxRetries: u32(50),
}},
},
}, {
Name: "service-stats",
AltStatName: strings.Join([]string{c.Namespace, "service-stats", strconv.Itoa(c.adminPort())}, "_"),
ConnectTimeout: 250 * time.Millisecond,
ClusterDiscoveryType: ClusterDiscoveryType(api.Cluster_LOGICAL_DNS),
LbPolicy: api.Cluster_ROUND_ROBIN,
LoadAssignment: &api.ClusterLoadAssignment{
ClusterName: "service-stats",
Endpoints: Endpoints(
SocketAddress(c.adminAddress(), c.adminPort()),
),
},
}},
},
Admin: &bootstrap.Admin{
AccessLogPath: c.adminAccessLogPath(),
Address: SocketAddress(c.adminAddress(), c.adminPort()),
},
}
if c.GrpcClientCert != "" || c.GrpcClientKey != "" || c.GrpcCABundle != "" {
// If one of the two TLS options is not empty, they all must be not empty
if !(c.GrpcClientCert != "" && c.GrpcClientKey != "" && c.GrpcCABundle != "") {
log.Fatal("You must supply all three TLS parameters - --envoy-cafile, --envoy-cert-file, --envoy-key-file, or none of them.")
}
b.StaticResources.Clusters[0].TlsContext = upstreamFileTLSContext(c.GrpcCABundle, c.GrpcClientCert, c.GrpcClientKey)
}
return b
}
func upstreamFileTLSContext(cafile, certfile, keyfile string) *auth.UpstreamTlsContext {
context := &auth.UpstreamTlsContext{
CommonTlsContext: &auth.CommonTlsContext{
TlsCertificates: []*auth.TlsCertificate{{
CertificateChain: &core.DataSource{
Specifier: &core.DataSource_Filename{
Filename: certfile,
},
},
PrivateKey: &core.DataSource{
Specifier: &core.DataSource_Filename{
Filename: keyfile,
},
},
}},
ValidationContextType: &auth.CommonTlsContext_ValidationContext{
ValidationContext: &auth.CertificateValidationContext{
TrustedCa: &core.DataSource{
Specifier: &core.DataSource_Filename{
Filename: cafile,
},
},
// TODO(youngnick): Does there need to be a flag wired down to here?
VerifySubjectAltName: []string{"contour"},
},
},
},
}
return context
}
// BootstrapConfig holds configuration values for a v2.Bootstrap.
type BootstrapConfig struct {
// AdminAccessLogPath is the path to write the access log for the administration server.
// Defaults to /dev/null.
AdminAccessLogPath string
// AdminAddress is the TCP address that the administration server will listen on.
// Defaults to 127.0.0.1.
AdminAddress string
// AdminPort is the port that the administration server will listen on.
// Defaults to 9001.
AdminPort int
// XDSAddress is the TCP address of the gRPC XDS management server.
// Defaults to 127.0.0.1.
XDSAddress string
// XDSGRPCPort is the management server port that provides the v2 gRPC API.
// Defaults to 8001.
XDSGRPCPort int
// Namespace is the namespace where Contour is running
Namespace string
//GrpcCABundle is the filename that contains a CA certificate chain that can
//verify the client cert.
GrpcCABundle string
// GrpcClientCert is the filename that contains a client certificate. May contain a full bundle if you
// don't want to pass a CA Bundle.
GrpcClientCert string
// GrpcClientKey is the filename that contains a client key for secure gRPC with TLS.
GrpcClientKey string
}
func (c *BootstrapConfig) xdsAddress() string { return stringOrDefault(c.XDSAddress, "127.0.0.1") }
func (c *BootstrapConfig) xdsGRPCPort() int { return intOrDefault(c.XDSGRPCPort, 8001) }
func (c *BootstrapConfig) adminAddress() string { return stringOrDefault(c.AdminAddress, "127.0.0.1") }
func (c *BootstrapConfig) adminPort() int { return intOrDefault(c.AdminPort, 9001) }
func (c *BootstrapConfig) adminAccessLogPath() string {
return stringOrDefault(c.AdminAccessLogPath, "/dev/null")
}
func stringOrDefault(s, def string) string {
if s == "" {
return def
}
return s
}
func intOrDefault(i, def int) int {
if i == 0 {
return def
}
return i
}