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resourceprovider.go
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/
resourceprovider.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 (
"bytes"
"context"
"encoding/json"
"fmt"
"golang.org/x/exp/slices"
"namespacelabs.dev/foundation/framework/rpcerrors/multierr"
"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"
)
var resourceProviderFields = []string{
// Needs to contain JSON names of cueResourceProvider fields.
"inputs", "intent", "availableClasses", "availablePackages",
"initializedWith", "resourcesFrom", "resources", "prepareWith",
}
type cueResourceProvider struct {
ResourceInputs map[string]cueResourceProviderInput `json:"inputs"`
Intent *cueResourceType `json:"intent,omitempty"`
AvailableClasses []string `json:"availableClasses"`
AvailablePackages []string `json:"availablePackages"`
// TODO: parse prepare hook.
}
type cueResourceProviderInput struct {
Class string
Default string
}
func parseResourceProvider(ctx context.Context, env *schema.Environment, pl parsing.EarlyPackageLoader, pkg *pkggraph.Package, key string, v *fncue.CueV) (*schema.ResourceProvider, error) {
if err := ValidateNoExtraFields(pkg.Location, fmt.Sprintf("resource provider %q:", key) /* messagePrefix */, v, resourceProviderFields); err != nil {
return nil, err
}
var bits cueResourceProvider
if err := v.Val.Decode(&bits); err != nil {
return nil, err
}
if bits.Intent == nil {
return nil, fnerrors.NewWithLocation(pkg.Location, "resource provider %q is missing an intent", key)
}
classRef, err := schema.ParsePackageRef(pkg.PackageName(), key)
if err != nil {
return nil, err
}
initializedWithInvocation, err := binary.ParseBinaryInvocationField(ctx, env, pl, pkg, "genb-res-init-"+key /* binaryName */, "initializedWith" /* cuePath */, v)
if err != nil {
return nil, err
}
resourcesFrom, err := binary.ParseBinaryInvocationField(ctx, env, pl, pkg, "genb-res-resfrom-"+key /* binaryName */, "resourcesFrom" /* cuePath */, v)
if err != nil {
return nil, err
}
instanceType, err := parseResourceType(ctx, pl, pkg.Location, bits.Intent)
if err != nil {
return nil, fnerrors.AttachLocation(pkg.Location, err)
}
rp := &schema.ResourceProvider{
PackageName: pkg.PackageName().String(),
ProvidesClass: classRef,
InitializedWith: initializedWithInvocation,
ResourcesFrom: resourcesFrom,
AvailablePackages: bits.AvailablePackages,
IntentType: instanceType,
}
for _, x := range bits.AvailableClasses {
ref, err := schema.ParsePackageRef(pkg.PackageName(), x)
if err != nil {
return nil, err
}
rp.AvailableClasses = append(rp.AvailableClasses, ref)
}
if resources := v.LookupPath("resources"); resources.Exists() {
resourceList, err := ParseResourceList(resources)
if err != nil {
return nil, fnerrors.NewWithLocation(pkg.Location, "parsing resources failed: %w", err)
}
pack, err := resourceList.ToPack(ctx, env, pl, pkg)
if err != nil {
return nil, err
}
rp.ResourcePack = pack
}
var errs []error
for key, value := range bits.ResourceInputs {
class, err := schema.ParsePackageRef(pkg.PackageName(), value.Class)
if err != nil {
errs = append(errs, err)
} else {
input := &schema.ResourceProvider_ResourceInput{
Name: schema.MakePackageRef(pkg.PackageName(), key),
Class: class,
}
if value.Default != "" {
parsed, err := schema.ParsePackageRef(pkg.PackageName(), value.Default)
if err != nil {
errs = append(errs, err)
} else {
input.DefaultResource = parsed
}
}
rp.ResourceInput = append(rp.ResourceInput, input)
}
}
if err := multierr.New(errs...); err != nil {
return nil, err
}
slices.SortFunc(rp.ResourceInput, func(a, b *schema.ResourceProvider_ResourceInput) bool {
x := a.Name.Compare(b.Name)
if x == 0 {
return a.Class.Compare(b.Class) < 0
}
return x < 0
})
rp.PrepareWith, err = binary.ParseBinaryInvocationField(ctx, env, pl, pkg, "genb-res-prep-"+key /* binaryName */, "prepareWith" /* cuePath */, v)
if err != nil {
return nil, err
}
return rp, nil
}
func (input *cueResourceProviderInput) UnmarshalJSON(data []byte) error {
dec := json.NewDecoder(bytes.NewReader(data))
tok, err := dec.Token()
if err != nil {
return err
}
if v, ok := tok.(string); ok {
input.Class = v
return nil
}
var values struct {
Class string `json:"class"`
Default string `json:"default"`
}
if err := json.Unmarshal(data, &values); err != nil {
return err
}
input.Class = values.Class
input.Default = values.Default
return nil
}