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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package lib // import "go.opentelemetry.io/contrib/instrgen/lib"
import (
"go/ast"
"strings"
"golang.org/x/tools/go/packages"
)
func removeStmt(slice []ast.Stmt, s int) []ast.Stmt {
return append(slice[:s], slice[s+1:]...)
}
func removeField(slice []*ast.Field, s int) []*ast.Field {
return append(slice[:s], slice[s+1:]...)
}
func removeExpr(slice []ast.Expr, s int) []ast.Expr {
return append(slice[:s], slice[s+1:]...)
}
// OtelPruner.
type OtelPruner struct{}
func inspectFuncContent(fType *ast.FuncType, fBody *ast.BlockStmt) {
for index := 0; index < len(fType.Params.List); index++ {
param := fType.Params.List[index]
for _, ident := range param.Names {
if strings.Contains(ident.Name, "__atel_") {
fType.Params.List = removeField(fType.Params.List, index)
index--
}
}
}
for index := 0; index < len(fBody.List); index++ {
stmt := fBody.List[index]
switch bodyStmt := stmt.(type) {
case *ast.AssignStmt:
if ident, ok := bodyStmt.Lhs[0].(*ast.Ident); ok {
if strings.Contains(ident.Name, "__atel_") {
fBody.List = removeStmt(fBody.List, index)
index--
}
}
if ident, ok := bodyStmt.Rhs[0].(*ast.Ident); ok {
if strings.Contains(ident.Name, "__atel_") {
fBody.List = removeStmt(fBody.List, index)
index--
}
}
case *ast.ExprStmt:
if call, ok := bodyStmt.X.(*ast.CallExpr); ok {
if sel, ok := call.Fun.(*ast.SelectorExpr); ok {
if strings.Contains(sel.Sel.Name, "SetTracerProvider") {
fBody.List = removeStmt(fBody.List, index)
index--
}
}
}
case *ast.DeferStmt:
if sel, ok := bodyStmt.Call.Fun.(*ast.SelectorExpr); ok {
if strings.Contains(sel.Sel.Name, "Shutdown") {
if ident, ok := sel.X.(*ast.Ident); ok {
if strings.Contains(ident.Name, "rtlib") {
fBody.List = removeStmt(fBody.List, index)
index--
}
}
}
if ident, ok := sel.X.(*ast.Ident); ok {
if strings.Contains(ident.Name, "__atel_") {
fBody.List = removeStmt(fBody.List, index)
index--
}
}
}
}
}
}
// Execute.
func (pass *OtelPruner) Execute(
node *ast.File,
analysis *PackageAnalysis,
pkg *packages.Package,
pkgs []*packages.Package,
) []Import {
var imports []Import
ast.Inspect(node, func(n ast.Node) bool {
switch x := n.(type) {
case *ast.FuncDecl:
inspectFuncContent(x.Type, x.Body)
case *ast.CallExpr:
for argIndex := 0; argIndex < len(x.Args); argIndex++ {
if ident, ok := x.Args[argIndex].(*ast.Ident); ok {
if strings.Contains(ident.Name, "__atel_") {
x.Args = removeExpr(x.Args, argIndex)
argIndex--
}
}
}
for argIndex := 0; argIndex < len(x.Args); argIndex++ {
if c, ok := x.Args[argIndex].(*ast.CallExpr); ok {
if sel, ok := c.Fun.(*ast.SelectorExpr); ok {
if ident, ok := sel.X.(*ast.Ident); ok {
if strings.Contains(ident.Name, "__atel_") {
x.Args = removeExpr(x.Args, argIndex)
argIndex--
}
}
}
}
}
case *ast.FuncLit:
inspectFuncContent(x.Type, x.Body)
case *ast.TypeSpec:
iface, ok := x.Type.(*ast.InterfaceType)
if !ok {
return true
}
for _, method := range iface.Methods.List {
funcType, ok := method.Type.(*ast.FuncType)
if !ok {
continue
}
for argIndex := 0; argIndex < len(funcType.Params.List); argIndex++ {
for _, ident := range funcType.Params.List[argIndex].Names {
if strings.Contains(ident.Name, "__atel_") {
funcType.Params.List = removeField(funcType.Params.List, argIndex)
argIndex--
}
}
}
}
}
return true
})
imports = append(imports, Import{"__atel_context", "context", Remove})
imports = append(imports, Import{"__atel_otel", "go.opentelemetry.io/otel", Remove})
imports = append(imports, Import{"__atel_otelhttp", "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp", Remove})
return imports
}
|
