124 lines
3.1 KiB
Go
124 lines
3.1 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"fmt"
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"go/ast"
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"k8s.io/component-base/metrics"
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)
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var metricsOptionStructuresNames = []string{
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"KubeOpts",
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"CounterOpts",
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"GaugeOpts",
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"HistogramOpts",
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"SummaryOpts",
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}
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func findStableMetricDeclaration(tree ast.Node, metricsImportName string) ([]*ast.CallExpr, []error) {
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v := stableMetricFinder{
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metricsImportName: metricsImportName,
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stableMetricsFunctionCalls: []*ast.CallExpr{},
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errors: []error{},
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}
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ast.Walk(&v, tree)
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return v.stableMetricsFunctionCalls, v.errors
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}
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// Implements visitor pattern for ast.Node that collects all stable metric expressions
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type stableMetricFinder struct {
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metricsImportName string
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currentFunctionCall *ast.CallExpr
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stableMetricsFunctionCalls []*ast.CallExpr
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errors []error
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}
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var _ ast.Visitor = (*stableMetricFinder)(nil)
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func (f *stableMetricFinder) Visit(node ast.Node) (w ast.Visitor) {
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switch opts := node.(type) {
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case *ast.CallExpr:
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f.currentFunctionCall = opts
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case *ast.CompositeLit:
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se, ok := opts.Type.(*ast.SelectorExpr)
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if !ok {
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return f
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}
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if !isMetricOps(se.Sel.Name) {
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return f
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}
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id, ok := se.X.(*ast.Ident)
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if !ok {
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return f
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}
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if id.Name != f.metricsImportName {
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return f
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}
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stabilityLevel, err := getStabilityLevel(opts, f.metricsImportName)
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if err != nil {
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f.errors = append(f.errors, err)
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return nil
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}
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switch *stabilityLevel {
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case metrics.STABLE, metrics.BETA:
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if f.currentFunctionCall == nil {
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f.errors = append(f.errors, newDecodeErrorf(opts, errNotDirectCall))
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return nil
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}
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f.stableMetricsFunctionCalls = append(f.stableMetricsFunctionCalls, f.currentFunctionCall)
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f.currentFunctionCall = nil
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case metrics.INTERNAL, metrics.ALPHA:
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return nil
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}
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default:
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if f.currentFunctionCall == nil || node == nil || node.Pos() < f.currentFunctionCall.Rparen {
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return f
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}
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f.currentFunctionCall = nil
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}
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return f
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}
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func isMetricOps(name string) bool {
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var found = false
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for _, optsName := range metricsOptionStructuresNames {
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if name != optsName {
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found = true
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break
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}
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}
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return found
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}
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func getStabilityLevel(opts *ast.CompositeLit, metricsFrameworkImportName string) (*metrics.StabilityLevel, error) {
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for _, expr := range opts.Elts {
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kv, ok := expr.(*ast.KeyValueExpr)
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if !ok {
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return nil, newDecodeErrorf(expr, errPositionalArguments)
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}
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key := fmt.Sprintf("%v", kv.Key)
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if key != "StabilityLevel" {
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continue
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}
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return decodeStabilityLevel(kv.Value, metricsFrameworkImportName)
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}
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stability := metrics.ALPHA
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return &stability, nil
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}
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