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resources.go
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resources.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 cuefrontend
import (
"context"
"encoding/json"
"fmt"
"io/fs"
"strings"
"golang.org/x/exp/slices"
"google.golang.org/protobuf/types/known/anypb"
"namespacelabs.dev/foundation/framework/rpcerrors/multierr"
"namespacelabs.dev/foundation/internal/codegen/protos/fnany"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/frontend/cuefrontend/binary"
"namespacelabs.dev/foundation/internal/frontend/fncue"
"namespacelabs.dev/foundation/internal/parsing"
"namespacelabs.dev/foundation/schema"
"namespacelabs.dev/foundation/std/pkggraph"
)
type ResourceList struct {
Refs []string
Instances map[string]*fncue.CueV
}
type CueResourceInstance struct {
Class string `json:"class"`
Provider string `json:"provider"`
RawIntent any `json:"intent"`
Resources map[string]string `json:"resources"`
// Prefer the definition above.
Kind string `json:"kind"`
On string `json:"on"`
RawInput any `json:"input"`
}
func exclusiveFieldsErr(fieldName ...string) error {
if len(fieldName) < 2 {
return nil
}
var quoted []string
for _, name := range fieldName {
quoted = append(quoted, fmt.Sprintf("%q", name))
}
return fnerrors.BadInputError("%s and %s are exclusive: only one of them can be set", strings.Join(quoted[:len(quoted)-1], ", "), quoted[len(quoted)-1])
}
func ParseResourceInstanceFromCue(ctx context.Context, env *schema.Environment, pl parsing.EarlyPackageLoader, pkg *pkggraph.Package, name string, v *fncue.CueV) (*schema.ResourceInstance, error) {
var src CueResourceInstance
if err := v.Val.Decode(&src); err != nil {
return nil, err
}
class, err1 := parseStrFieldCompat("class", src.Class, "kind", src.Kind, true)
provider, err2 := parseStrFieldCompat("provider", src.Provider, "on", src.On, false)
if err := multierr.New(err1, err2); err != nil {
return nil, err
}
if provider != "" && pkg.PackageName() != schema.PackageName(provider) {
if _, err := pl.LoadByName(ctx, schema.PackageName(provider)); err != nil {
return nil, err
}
}
classRef, err := schema.ParsePackageRef(pkg.PackageName(), class)
if err != nil {
return nil, err
}
intentFrom, err := binary.ParseBinaryInvocationField(ctx, env, pl, pkg, "genb-res-from-"+name /* binaryName */, "from" /* cuePath */, v)
if err != nil {
return nil, err
}
instance := &schema.ResourceInstance{
Name: name,
Class: classRef,
Provider: provider,
IntentFrom: intentFrom,
}
rawIntent := src.RawIntent
if rawIntent != nil {
if src.RawInput != nil {
return nil, exclusiveFieldsErr("intent", "input")
}
} else {
rawIntent = src.RawInput
}
if intentFrom == nil {
// Returns an empty proto of the intent type, wrapper into an Any, if rawIntent is nil.
instance.Intent, err = parseResourceIntent(ctx, pl, pkg.Location, classRef, rawIntent)
if err != nil {
return nil, err
}
} else if rawIntent != nil {
return nil, fnerrors.NewWithLocation(pkg.Location, "resource instance %q cannot specify both \"intent\" and \"from\"", name)
}
var parseErrs []error
for key, value := range src.Resources {
ref, err := schema.ParsePackageRef(pkg.PackageName(), value)
if err != nil {
parseErrs = append(parseErrs, err)
} else {
instance.InputResource = append(instance.InputResource, &schema.ResourceInstance_InputResource{
Name: &schema.PackageRef{PackageName: provider, Name: key},
ResourceRef: ref,
})
}
}
slices.SortFunc(instance.InputResource, func(a, b *schema.ResourceInstance_InputResource) bool {
x := a.Name.Compare(b.Name)
if x == 0 {
return strings.Compare(a.GetResourceRef().Canonical(), b.GetResourceRef().Canonical()) < 0
}
return x < 0
})
return instance, multierr.New(parseErrs...)
}
func parseStrFieldCompat(namev2, valuev2, namev1, valuev1 string, required bool) (string, error) {
if valuev2 != "" && valuev1 != "" {
return "", exclusiveFieldsErr(namev2, namev1)
}
if valuev2 != "" {
return valuev2, nil
}
if valuev1 != "" {
return valuev1, nil
}
if required {
return "", fnerrors.BadInputError("a %q value required", namev2)
}
return "", nil
}
func parseResourceIntent(ctx context.Context, pl parsing.EarlyPackageLoader, loc pkggraph.Location, classRef *schema.PackageRef, value any) (*anypb.Any, error) {
pkg, err := pl.LoadByName(ctx, classRef.AsPackageName())
if err != nil {
return nil, err
}
rc := pkg.LookupResourceClass(classRef.Name)
if rc == nil {
return nil, fnerrors.NewWithLocation(loc, "resource class %q not found", classRef.Canonical())
}
if value == nil {
return nil, nil
}
fsys, err := pl.WorkspaceOf(ctx, loc.Module)
if err != nil {
return nil, fnerrors.InternalError("failed to retrieve workspace access: %w", err)
}
subFsys, err := fs.Sub(fsys, loc.Rel())
if err != nil {
return nil, fnerrors.InternalError("failed to retrieve workspace access: %w", err)
}
msg, err := allocateMessage(subFsys, rc.IntentType.Descriptor, value)
if err != nil {
return nil, err
}
return fnany.Marshal(rc.PackageName(), msg)
}
func ParseResourceList(v *fncue.CueV) (*ResourceList, error) {
contents, err := v.Val.MarshalJSON()
if err != nil {
return nil, err
}
var rl ResourceList
var list []string
if json.Unmarshal(contents, &list) == nil {
rl.Refs = list
return &rl, nil
}
it, err := v.Val.Fields()
if err != nil {
return nil, err
}
rl.Instances = map[string]*fncue.CueV{}
for it.Next() {
rl.Instances[it.Label()] = &fncue.CueV{Val: it.Value()}
}
return &rl, nil
}
func (rl *ResourceList) ToPack(ctx context.Context, env *schema.Environment, pl parsing.EarlyPackageLoader, pkg *pkggraph.Package) (*schema.ResourcePack, error) {
pack := &schema.ResourcePack{}
for _, resource := range rl.Refs {
r, err := ParseResourceRef(ctx, pl, pkg.Location, resource)
if err != nil {
return nil, err
}
pack.ResourceRef = append(pack.ResourceRef, r)
}
for name, instance := range rl.Instances {
instance, err := ParseResourceInstanceFromCue(ctx, env, pl, pkg, name, instance)
if err != nil {
return nil, err
}
pack.ResourceInstance = append(pack.ResourceInstance, instance)
}
return pack, nil
}
func ParseResourceRef(ctx context.Context, pl pkggraph.PackageLoader, loc pkggraph.Location, ref string) (*schema.PackageRef, error) {
pkgRef, err := schema.ParsePackageRef(loc.PackageName, ref)
if err != nil {
return nil, err
}
if loc.PackageName != pkgRef.AsPackageName() {
if _, err := pl.LoadByName(ctx, pkgRef.AsPackageName()); err != nil {
return nil, err
}
}
return pkgRef, nil
}