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result.go
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result.go
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package parser
import (
"fmt"
"go/ast"
"go/token"
"reflect"
"strings"
"encr.dev/pkg/fns"
"encr.dev/pkg/option"
"encr.dev/pkg/paths"
"encr.dev/v2/internals/perr"
"encr.dev/v2/internals/pkginfo"
"encr.dev/v2/internals/posmap"
"encr.dev/v2/parser/infra/sqldb"
"encr.dev/v2/parser/resource"
"encr.dev/v2/parser/resource/usage"
)
// computeResult computes the combined resource description.
func computeResult(errs *perr.List, mainModule *pkginfo.Module, ur *usage.Resolver, appPackages []*pkginfo.Package, resources []resource.Resource, binds []resource.Bind, usageExprs []usage.Expr) *Result {
d := &Result{
mainModule: mainModule,
appPackages: appPackages,
resources: resources,
allBinds: binds,
allUsageExprs: usageExprs,
resMap: make(map[resource.Resource]*resourceMeta),
byType: make(map[reflect.Type][]resource.Resource),
bindToResource: make(map[resource.Bind]resource.Resource, len(binds)),
qnToBind: make(map[pkginfo.QualifiedName]resource.Bind, len(binds)),
usageByPkg: make(map[paths.Pkg][]usage.Usage),
}
d.initResources()
d.initBinds(errs, binds)
d.initUsages(errs, ur, usageExprs)
return d
}
func Resources[R resource.Resource](res *Result) []R {
var zero R
resources := res.byType[reflect.TypeOf(zero)]
return fns.Map(resources, func(r resource.Resource) R {
return r.(R)
})
}
type Result struct {
mainModule *pkginfo.Module
appPackages []*pkginfo.Package
resources []resource.Resource
allBinds []resource.Bind
allUsageExprs []usage.Expr
resMap map[resource.Resource]*resourceMeta
byType map[reflect.Type][]resource.Resource
bindToResource map[resource.Bind]resource.Resource
qnToBind map[pkginfo.QualifiedName]resource.Bind
resByPos posmap.Map[resource.Resource]
usageByPos posmap.Map[usage.Usage]
usageByPkg map[paths.Pkg][]usage.Usage
}
func (d *Result) MainModule() *pkginfo.Module {
return d.mainModule
}
func (d *Result) AppPackages() []*pkginfo.Package {
return d.appPackages
}
func (d *Result) PackageAt(path paths.Pkg) option.Option[*pkginfo.Package] {
for _, pkg := range d.appPackages {
if pkg.ImportPath == path {
return option.Some(pkg)
}
}
return option.None[*pkginfo.Package]()
}
func (d *Result) Resources() []resource.Resource {
return d.resources
}
func (d *Result) AllBinds() []resource.Bind {
return d.allBinds
}
func (d *Result) AllUsageExprs() []usage.Expr {
return d.allUsageExprs
}
func (d *Result) ResourceForBind(b resource.Bind) resource.Resource {
return d.bindToResource[b]
}
func (d *Result) ResourceForQN(qn pkginfo.QualifiedName) option.Option[resource.Resource] {
return option.Map(d.BindForQN(qn), d.ResourceForBind)
}
func (d *Result) BindForQN(qn pkginfo.QualifiedName) option.Option[resource.Bind] {
return option.AsOptional(d.qnToBind[qn])
}
func (d *Result) Binds(res resource.Resource) []resource.Bind {
return d.rd(res).binds
}
func (d *Result) PkgDeclBinds(res resource.Resource) []*resource.PkgDeclBind {
return d.rd(res).pkgDecls
}
func (d *Result) Usages(res resource.Resource) []usage.Usage {
return d.rd(res).usages
}
func (d *Result) AllUsages() []usage.Usage {
var all []usage.Usage
for _, res := range d.resources {
all = append(all, d.Usages(res)...)
}
return all
}
func (d *Result) ResourceConstructorContaining(node ast.Node) option.Option[resource.Resource] {
return d.resByPos.Containing(node)
}
func (d *Result) UsageFromNode(node ast.Node) option.Option[usage.Usage] {
return d.usageByPos.Containing(node)
}
func (d *Result) UsagesInPkg(pkgPath paths.Pkg) []usage.Usage {
return d.usageByPkg[pkgPath]
}
func (d *Result) rd(res resource.Resource) *resourceMeta {
m := d.resMap[res]
if m == nil {
m = &resourceMeta{}
d.resMap[res] = m
}
return m
}
// resourceMeta describes metadata about a resource.
type resourceMeta struct {
binds []resource.Bind
pkgDecls []*resource.PkgDeclBind
usages []usage.Usage
}
func (m *resourceMeta) addBind(b resource.Bind) {
m.binds = append(m.binds, b)
if pkgDecl, ok := b.(*resource.PkgDeclBind); ok {
m.pkgDecls = append(m.pkgDecls, pkgDecl)
}
}
func (m *resourceMeta) addUsage(u usage.Usage) {
m.usages = append(m.usages, u)
}
func (d *Result) initResources() {
d.resByPos = posmap.Build(d.resources...)
for _, res := range d.resources {
typ := reflect.TypeOf(res)
d.byType[typ] = append(d.byType[typ], res)
}
}
func (d *Result) initBinds(errs *perr.List, binds []resource.Bind) {
byPath := make(map[string]resource.Resource, len(d.resources))
for _, r := range d.resources {
// If we have a named resource, add it to the path map.
if named, ok := r.(resource.Named); ok {
p := resource.Path{{named.Kind(), named.ResourceName()}}
byPath[pathKey(p)] = r
}
}
addBind := func(r resource.Resource, b resource.Bind) {
d.rd(r).addBind(b)
d.bindToResource[b] = r
if pkgBind, ok := b.(*resource.PkgDeclBind); ok && pkgBind != nil {
d.qnToBind[pkgBind.QualifiedName()] = b
}
}
for _, b := range binds {
// Do we have a specific resource reference?
ref := b.ResourceRef()
if r := ref.Resource; r != nil {
addBind(r, b)
continue
}
// Otherwise figure out the resource from the bind path.
key := pathKey(ref.Path)
if r, ok := byPath[key]; ok {
addBind(r, b)
} else {
switch {
case len(ref.Path) > 0 && ref.Path[0].Kind == resource.SQLDatabase:
dbName := ref.Path[0].Name
errs.Add(sqldb.ErrDatabaseNotFound(dbName).AtGoPos(b.Pos(), token.NoPos))
default:
// NOTE(andre): We could end up here in the future when we support
// named references to PubSub subscriptions, since those would
// involve a two-segment resource path (first the topic and then the subscription),
// which we don't support today (the construction of byPath above only handles
// the case of single-segment resource paths).
// Since we don't support that today, this is fine for now.
errs.Addf(b.Pos(), "internal compiler error: unknown resource (path %q)", key)
}
}
}
}
func (d *Result) initUsages(errs *perr.List, ur *usage.Resolver, usageExprs []usage.Expr) {
resourcesByBindName := make(map[pkginfo.QualifiedName]resource.Resource, len(d.resources))
for r, m := range d.resMap {
for _, pkgDecl := range m.pkgDecls {
resourcesByBindName[pkgDecl.QualifiedName()] = r
}
}
var allUsages []usage.Usage
processUsage := func(r resource.Resource, expr usage.Expr) {
if u, ok := ur.Resolve(errs, expr, r).Get(); ok {
d.rd(r).addUsage(u)
allUsages = append(allUsages, u)
pkgPath := u.DeclaredIn().Pkg.ImportPath
d.usageByPkg[pkgPath] = append(d.usageByPkg[pkgPath], u)
}
}
for _, u := range usageExprs {
bind := u.ResourceBind()
ref := bind.ResourceRef()
if r := ref.Resource; r != nil {
processUsage(r, u)
} else if pkgDecl, ok := bind.(*resource.PkgDeclBind); ok {
if r, ok := resourcesByBindName[pkgDecl.QualifiedName()]; ok {
processUsage(r, u)
} else {
errs.Addf(u.ASTExpr().Pos(), "internal compiler error: resource reference not found: %s",
pkgDecl.QualifiedName().NaiveDisplayName())
}
} else {
errs.Addf(u.ASTExpr().Pos(), "internal compiler error: invalid resource bind: %T", bind)
}
}
d.usageByPos = posmap.Build[usage.Usage](allUsages...)
}
func pathKey(path resource.Path) string {
var b strings.Builder
for i, e := range path {
if i > 0 {
b.WriteString("/")
}
fmt.Fprintf(&b, "%s:%s", e.Kind.String(), e.Name)
}
return b.String()
}