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