open-consul/agent/xds/envoy_versioning.go

117 lines
3.3 KiB
Go

package xds
import (
"fmt"
envoy_core_v3 "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
"github.com/hashicorp/go-version"
)
var (
// minSupportedVersion is the oldest mainline version we support. This should always be
// the zero'th point release of the last element of proxysupport.EnvoyVersions.
minSupportedVersion = version.Must(version.NewVersion("1.16.0"))
// add min version constraints for associated feature flags when necessary, for example:
// minVersionAllowingEmptyGatewayClustersWithIncrementalXDS = version.Must(version.NewVersion("1.16.0"))
specificUnsupportedVersions = []unsupportedVersion{}
)
type unsupportedVersion struct {
Version *version.Version
UpgradeTo string
Why string
}
type supportedProxyFeatures struct {
// add version dependent feature flags here
//
// For example, we previously had flags for Envoy < 1.16 called:
//
// GatewaysNeedStubClusterWhenEmptyWithIncrementalXDS
// IncrementalXDSUpdatesMustBeSerial
//
// Which then manifested in the code for checks with this struct populated.
// By dropping support for 1.15, we no longer have any special flags here
// but leaving this flagging functionality for future one-offs.
}
func determineSupportedProxyFeatures(node *envoy_core_v3.Node) (supportedProxyFeatures, error) {
version := determineEnvoyVersionFromNode(node)
return determineSupportedProxyFeaturesFromVersion(version)
}
func determineSupportedProxyFeaturesFromString(vs string) (supportedProxyFeatures, error) {
version := version.Must(version.NewVersion(vs))
return determineSupportedProxyFeaturesFromVersion(version)
}
func determineSupportedProxyFeaturesFromVersion(version *version.Version) (supportedProxyFeatures, error) {
if version == nil {
// This would happen on either extremely old builds OR perhaps on
// custom builds. Should we error?
return supportedProxyFeatures{}, nil
}
if version.LessThan(minSupportedVersion) {
return supportedProxyFeatures{}, fmt.Errorf("Envoy %s is too old and is not supported by Consul", version)
}
for _, uv := range specificUnsupportedVersions {
if version.Equal(uv.Version) {
return supportedProxyFeatures{}, fmt.Errorf(
"Envoy %s is too old of a point release and is not supported by Consul because it %s. "+
"Please upgrade to version %s.",
version,
uv.Why,
uv.UpgradeTo,
)
}
}
sf := supportedProxyFeatures{}
// add version constraints to populate feature flags here when necessary, for example:
/*
if version.LessThan(minVersionAllowingEmptyGatewayClustersWithIncrementalXDS) {
sf.GatewaysNeedStubClusterWhenEmptyWithIncrementalXDS = true
}
*/
return sf, nil
}
func determineEnvoyVersionFromNode(node *envoy_core_v3.Node) *version.Version {
if node == nil {
return nil
}
if node.UserAgentVersionType == nil {
return nil
}
if node.UserAgentName != "envoy" {
return nil
}
bv, ok := node.UserAgentVersionType.(*envoy_core_v3.Node_UserAgentBuildVersion)
if !ok {
// NOTE: we could sniff for *envoycore.Node_UserAgentVersion and do more regex but official builds don't have this problem.
return nil
}
if bv.UserAgentBuildVersion == nil {
return nil
}
v := bv.UserAgentBuildVersion.Version
return version.Must(version.NewVersion(
fmt.Sprintf("%d.%d.%d",
v.GetMajorNumber(),
v.GetMinorNumber(),
v.GetPatch(),
),
))
}