84 lines
2.1 KiB
Go
84 lines
2.1 KiB
Go
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package xds
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import (
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"fmt"
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"regexp"
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envoycore "github.com/envoyproxy/go-control-plane/envoy/api/v2/core"
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"github.com/hashicorp/go-version"
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)
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var (
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// minSafeRegexVersion reflects the minimum version where we could use safe_regex instead of regex
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//
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// NOTE: the first version that no longer supported the old style was 1.13.0
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minSafeRegexVersion = version.Must(version.NewVersion("1.11.2"))
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)
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type supportedProxyFeatures struct {
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RouterMatchSafeRegex bool // use safe_regex instead of regex in http.router rules
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}
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func determineSupportedProxyFeatures(node *envoycore.Node) supportedProxyFeatures {
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version := determineEnvoyVersionFromNode(node)
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if version == nil {
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return supportedProxyFeatures{}
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}
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return supportedProxyFeatures{
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RouterMatchSafeRegex: !version.LessThan(minSafeRegexVersion),
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}
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}
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// example: 1580db37e9a97c37e410bad0e1507ae1a0fd9e77/1.12.4/Clean/RELEASE/BoringSSL
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var buildVersionPattern = regexp.MustCompile(`^[a-f0-9]{40}/([^/]+)/Clean/RELEASE/BoringSSL$`)
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func determineEnvoyVersionFromNode(node *envoycore.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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if node.BuildVersion == "" {
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return nil
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}
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// Must be an older pre-1.13 envoy
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m := buildVersionPattern.FindStringSubmatch(node.BuildVersion)
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if m == nil {
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return nil
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}
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return version.Must(version.NewVersion(m[1]))
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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.(*envoycore.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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func determineSupportedProxyFeaturesFromString(vs string) supportedProxyFeatures {
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version := version.Must(version.NewVersion(vs))
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return supportedProxyFeatures{
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RouterMatchSafeRegex: !version.LessThan(minSafeRegexVersion),
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}
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}
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