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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package lib // import "go.opentelemetry.io/contrib/instrgen/lib"
import (
"fmt"
"go/ast"
"golang.org/x/tools/go/packages"
)
func isFunPartOfCallGraph(fun FuncDescriptor, callgraph map[FuncDescriptor][]FuncDescriptor) bool {
// TODO this is not optimap o(n)
for k, v := range callgraph {
if k.TypeHash() == fun.TypeHash() {
return true
}
for _, e := range v {
if fun.TypeHash() == e.TypeHash() {
return true
}
}
}
return false
}
// ContextPropagationPass.
type ContextPropagationPass struct{}
// Execute.
func (pass *ContextPropagationPass) Execute(
node *ast.File,
analysis *PackageAnalysis,
pkg *packages.Package,
pkgs []*packages.Package,
) []Import {
var imports []Import
addImports := false
// below variable is used
// when callexpr is inside var decl
// instead of functiondecl
currentFun := FuncDescriptor{}
emitEmptyContext := func(callExpr *ast.CallExpr, ctxArg *ast.Ident) {
addImports = true
if currentFun != (FuncDescriptor{}) {
visited := map[FuncDescriptor]bool{}
if isPath(analysis.Callgraph, currentFun, analysis.RootFunctions[0], visited) {
callExpr.Args = append([]ast.Expr{ctxArg}, callExpr.Args...)
} else {
contextTodo := &ast.CallExpr{
Fun: &ast.SelectorExpr{
X: &ast.Ident{
Name: "__atel_context",
},
Sel: &ast.Ident{
Name: "TODO",
},
},
Lparen: 62,
Ellipsis: 0,
}
callExpr.Args = append([]ast.Expr{contextTodo}, callExpr.Args...)
}
return
}
contextTodo := &ast.CallExpr{
Fun: &ast.SelectorExpr{
X: &ast.Ident{
Name: "__atel_context",
},
Sel: &ast.Ident{
Name: "TODO",
},
},
Lparen: 62,
Ellipsis: 0,
}
callExpr.Args = append([]ast.Expr{contextTodo}, callExpr.Args...)
}
emitCallExpr := func(ident *ast.Ident, n ast.Node, ctxArg *ast.Ident, pkgPath string) {
if callExpr, ok := n.(*ast.CallExpr); ok {
funId := pkgPath + "." + pkg.TypesInfo.Uses[ident].Name()
fun := FuncDescriptor{
Id: funId,
DeclType: pkg.TypesInfo.Uses[ident].Type().String(),
CustomInjection: false,
}
found := analysis.FuncDecls[fun]
// inject context parameter only
// to these functions for which function decl
// exists
if found {
visited := map[FuncDescriptor]bool{}
if isPath(analysis.Callgraph, fun, analysis.RootFunctions[0], visited) {
fmt.Println("\t\t\tContextPropagation FuncCall:", funId, pkg.TypesInfo.Uses[ident].Type().String())
emitEmptyContext(callExpr, ctxArg)
}
}
}
}
ast.Inspect(node, func(n ast.Node) bool {
ctxArg := &ast.Ident{
Name: "__atel_child_tracing_ctx",
}
ctxField := &ast.Field{
Names: []*ast.Ident{
{
Name: "__atel_tracing_ctx",
},
},
Type: &ast.SelectorExpr{
X: &ast.Ident{
Name: "__atel_context",
},
Sel: &ast.Ident{
Name: "Context",
},
},
}
switch xNode := n.(type) {
case *ast.FuncDecl:
pkgPath := GetPkgPathForFunction(pkg, pkgs, xNode, analysis.Interfaces)
funId := pkgPath + "." + pkg.TypesInfo.Defs[xNode.Name].Name()
fun := FuncDescriptor{
Id: funId,
DeclType: pkg.TypesInfo.Defs[xNode.Name].Type().String(),
CustomInjection: false,
}
currentFun = fun
// inject context only
// functions available in the call graph
if !isFunPartOfCallGraph(fun, analysis.Callgraph) {
break
}
if Contains(analysis.RootFunctions, fun) {
break
}
visited := map[FuncDescriptor]bool{}
if isPath(analysis.Callgraph, fun, analysis.RootFunctions[0], visited) {
fmt.Println("\t\t\tContextPropagation FuncDecl:", funId,
pkg.TypesInfo.Defs[xNode.Name].Type().String())
addImports = true
xNode.Type.Params.List = append([]*ast.Field{ctxField}, xNode.Type.Params.List...)
}
case *ast.CallExpr:
if ident, ok := xNode.Fun.(*ast.Ident); ok {
if pkg.TypesInfo.Uses[ident] == nil {
return false
}
pkgPath := GetPkgNameFromUsesTable(pkg, ident)
emitCallExpr(ident, n, ctxArg, pkgPath)
}
if sel, ok := xNode.Fun.(*ast.SelectorExpr); ok {
if pkg.TypesInfo.Uses[sel.Sel] == nil {
return false
}
pkgPath := GetPkgNameFromUsesTable(pkg, sel.Sel)
if sel.X != nil {
pkgPath = GetSelectorPkgPath(sel, pkg, pkgPath)
}
emitCallExpr(sel.Sel, n, ctxArg, pkgPath)
}
case *ast.TypeSpec:
iname := xNode.Name
iface, ok := xNode.Type.(*ast.InterfaceType)
if !ok {
return true
}
for _, method := range iface.Methods.List {
funcType, ok := method.Type.(*ast.FuncType)
if !ok {
return true
}
visited := map[FuncDescriptor]bool{}
pkgPath := GetPkgNameFromDefsTable(pkg, method.Names[0])
funId := pkgPath + "." + iname.Name + "." + pkg.TypesInfo.Defs[method.Names[0]].Name()
fun := FuncDescriptor{
Id: funId,
DeclType: pkg.TypesInfo.Defs[method.Names[0]].Type().String(),
CustomInjection: false,
}
if isPath(analysis.Callgraph, fun, analysis.RootFunctions[0], visited) {
fmt.Println("\t\t\tContext Propagation InterfaceType", fun.Id, fun.DeclType)
addImports = true
funcType.Params.List = append([]*ast.Field{ctxField}, funcType.Params.List...)
}
}
}
return true
})
if addImports {
imports = append(imports, Import{"__atel_context", "context", Add})
}
return imports
}
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