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closure.go
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closure.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package parsing
import (
"context"
"math"
"sort"
"strings"
"sync"
"golang.org/x/exp/slices"
"golang.org/x/sync/errgroup"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/schema"
"namespacelabs.dev/foundation/std/pkggraph"
)
var ExtendServerHook []func(pkggraph.Location, *schema.Server) ExtendServerHookResult
var ExtendNodeHook []func(context.Context, pkggraph.PackageLoader, pkggraph.Location, *schema.Node) (*ExtendNodeHookResult, error)
type ExtendServerHookResult struct {
Import []schema.PackageName
}
type ExtendNodeHookResult struct {
Import []schema.PackageName
LoadPackages []schema.PackageName // Packages to also be loaded by nodes, but that won't be listed as dependencies.
}
type Sealed struct {
Location pkggraph.Location
Proto *schema.Stack_Entry
FileDeps []string
Deps []*pkggraph.Package
ParsedPackage *pkggraph.Package
}
type SealHelper struct {
AdditionalServerDeps func(schema.Framework) ([]schema.PackageName, error)
}
func Seal(ctx context.Context, loader pkggraph.PackageLoader, focus schema.PackageName, helper *SealHelper) (Sealed, error) {
sealer := newSealer(ctx, loader, focus, helper)
sealer.Do(focus)
return sealer.finishSealing(ctx)
}
func (s Sealed) HasDep(packageName schema.PackageName) bool {
for _, dep := range s.Deps {
if dep.Location.PackageName == packageName {
return true
}
}
return false
}
type sealer struct {
g *errgroup.Group
gctx context.Context
focus schema.PackageName
loader pkggraph.PackageLoader
helper *SealHelper
mu sync.Mutex
seen schema.PackageList
result *schema.Stack_Entry
parsed []*pkggraph.Package
serverPackage *pkggraph.Package
serverIncludes []schema.PackageName
}
func (g *sealer) DoServer(loc pkggraph.Location, srv *schema.Server, pp *pkggraph.Package) error {
var include []schema.PackageName
if handler, ok := FrameworkHandlers[srv.Framework]; ok {
var ext ServerFrameworkExt
if err := handler.PreParseServer(g.gctx, loc, &ext); err != nil {
return err
}
include = append(include, ext.Include...)
}
if g.helper != nil && g.helper.AdditionalServerDeps != nil {
deps, err := g.helper.AdditionalServerDeps(srv.Framework)
if err != nil {
return err
}
include = append(include, deps...)
}
for _, hook := range ExtendServerHook {
r := hook(loc, srv)
include = append(include, r.Import...)
}
include = append(include, srv.GetImportedPackages()...)
g.Do(include...)
g.mu.Lock()
defer g.mu.Unlock()
if g.result.Server != nil {
return fnerrors.InternalError("%v: server already defined (%v)", srv.PackageName, g.result.Server.PackageName)
}
g.result.Server = srv
g.serverPackage = pp
g.serverIncludes = include
return nil
}
func (g *sealer) DoNode(loc pkggraph.Location, n *schema.Node, parsed *pkggraph.Package) error {
g.Do(n.GetImportedPackages()...)
g.mu.Lock()
defer g.mu.Unlock()
g.result.Node = append(g.result.Node, n)
g.parsed = append(g.parsed, parsed)
return nil
}
func (g *sealer) Do(pkgs ...schema.PackageName) {
var todo []schema.PackageName
g.mu.Lock()
for _, pkg := range pkgs {
if g.seen.Add(pkg) {
todo = append(todo, pkg)
}
}
g.mu.Unlock()
for _, pkg := range todo {
pkg := pkg // close pkg
g.g.Go(func() error {
p, err := g.loader.LoadByName(g.gctx, pkg)
if err != nil {
return err
}
if p == nil {
return fnerrors.NewWithLocation(pkg, "expected definition")
}
switch {
case p.Server != nil:
return g.DoServer(p.Location, p.Server, p)
case p.Node() != nil:
return g.DoNode(p.Location, p.Node(), p)
default:
// Do nothing.
return nil
}
})
}
}
func newSealer(ctx context.Context, loader pkggraph.PackageLoader, focus schema.PackageName, helper *SealHelper) *sealer {
g, gctx := errgroup.WithContext(ctx)
return &sealer{
g: g,
gctx: gctx,
focus: focus,
loader: loader,
helper: helper,
result: &schema.Stack_Entry{},
}
}
func likeTopoSort(entry *schema.Stack_Entry, pkgs []schema.PackageName, out *schema.PackageList) {
for _, pkg := range pkgs {
likeTopoSort(entry, entry.ImportsOf(pkg), out)
out.Add(pkg)
}
}
func (s *sealer) finishSealing(ctx context.Context) (Sealed, error) {
if err := s.g.Wait(); err != nil {
return Sealed{}, err
}
slices.SortFunc(s.result.Node, func(a, b *schema.Node) bool {
return strings.Compare(a.PackageName, b.PackageName) < 0
})
var nodes []*pkggraph.Package
for _, n := range s.result.ExtsAndServices() {
var parsed *pkggraph.Package
for _, pp := range s.parsed {
if pp.Location.PackageName.Equals(n.PackageName) {
parsed = pp
break
}
}
if parsed == nil {
return Sealed{}, fnerrors.New("%v: missing parsed package", n.PackageName)
}
nodes = append(nodes, parsed)
}
m := map[string]int{}
stackEntry := s.result
for k, pkg := range stackEntry.ImportsOf(s.focus) {
m[pkg.String()] = k + 1
}
sort.Slice(stackEntry.Node, func(i, j int) bool {
pkgI, pkgJ := stackEntry.Node[i].PackageName, stackEntry.Node[j].PackageName
a, ok1 := m[pkgI]
b, ok2 := m[pkgJ]
if !ok1 {
a = math.MaxInt32
}
if !ok2 {
b = math.MaxInt32
}
if a == b {
return strings.Compare(pkgI, pkgJ) < 0
}
return a < b
})
res := Sealed{
Proto: stackEntry,
Deps: nodes,
ParsedPackage: s.serverPackage,
}
return res, nil
}