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load.go
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load.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 devhost
import (
"bytes"
"context"
"errors"
"io"
"io/fs"
"strings"
"google.golang.org/protobuf/encoding/prototext"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/reflect/protoregistry"
"google.golang.org/protobuf/types/known/anypb"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/fnfs"
"namespacelabs.dev/foundation/internal/parsing"
"namespacelabs.dev/foundation/internal/protos"
"namespacelabs.dev/foundation/schema"
"namespacelabs.dev/foundation/std/cfg"
)
const DevHostFilename = "devhost.textpb"
var HasRuntime func(string) bool
func HostOnlyFiles() []string { return []string{DevHostFilename} }
func Prepare(ctx context.Context, root *parsing.Root) error {
root.LoadedDevHost = &schema.DevHost{} // Make sure we always have an instance of DevHost, even if empty.
devHostBytes, err := fs.ReadFile(root.ReadWriteFS(), DevHostFilename)
if err != nil {
if !errors.Is(err, fs.ErrNotExist) {
return err
}
} else {
opt := prototext.UnmarshalOptions{
Resolver: configMessageLookup{},
}
if err := opt.Unmarshal(devHostBytes, root.LoadedDevHost); err != nil {
return fnerrors.BadInputError("Failed to parse %q. If you changed it manually, try to undo your changes. Saw: %w", DevHostFilename, err)
}
}
for _, entry := range root.LoadedDevHost.Configure {
if err := validate(entry.Configuration); err != nil {
return err
}
for _, y := range entry.PlatformConfiguration {
if err := validate(y.Configuration); err != nil {
return err
}
}
}
for _, x := range root.LoadedDevHost.ConfigurePlatform {
if err := validate(x.Configuration); err != nil {
return err
}
}
if err := validate(root.LoadedDevHost.ConfigureTools); err != nil {
return err
}
for _, env := range root.Workspace().Proto().EnvSpec {
if !HasRuntime(env.Runtime) {
return fnerrors.InternalError("%s is not a supported runtime type", env.Runtime)
}
}
return nil
}
type configMessageLookup struct{}
var _ protoregistry.MessageTypeResolver = configMessageLookup{}
var _ protoregistry.ExtensionTypeResolver = configMessageLookup{}
func (configMessageLookup) FindMessageByName(message protoreflect.FullName) (protoreflect.MessageType, error) {
mt := cfg.LookupConfigMessage(message)
if mt == nil {
return nil, fnerrors.BadInputError("%s: no such configuration message", message)
}
return mt, nil
}
func (cl configMessageLookup) FindMessageByURL(url string) (protoreflect.MessageType, error) {
if i := strings.LastIndexByte(url, '/'); i >= 0 {
return cl.FindMessageByName(protoreflect.FullName(url[i+len("/"):]))
}
return nil, fnerrors.BadInputError("%s: no such configuration message url", url)
}
func (configMessageLookup) FindExtensionByName(field protoreflect.FullName) (protoreflect.ExtensionType, error) {
return protoregistry.GlobalTypes.FindExtensionByName(field)
}
func (configMessageLookup) FindExtensionByNumber(message protoreflect.FullName, field protoreflect.FieldNumber) (protoreflect.ExtensionType, error) {
return protoregistry.GlobalTypes.FindExtensionByNumber(message, field)
}
func validate(messages []*anypb.Any) error {
for _, msg := range messages {
if !cfg.IsValidConfigType(msg) {
return fnerrors.InternalError("%s: unsupported configuration type", msg.TypeUrl)
}
}
return nil
}
func MakeConfiguration(messages ...proto.Message) (*schema.DevHost_ConfigureEnvironment, error) {
c := &schema.DevHost_ConfigureEnvironment{}
for _, msg := range messages {
packed, err := anypb.New(msg)
if err != nil {
return nil, err
}
c.Configuration = append(c.Configuration, packed)
}
return c, nil
}
func Update(devHost *schema.DevHost, confs ...*schema.DevHost_ConfigureEnvironment) (*schema.DevHost, bool) {
copy := protos.Clone(devHost)
var totalChangeCount int
for _, conf := range confs {
var previous *schema.DevHost_ConfigureEnvironment
for _, existing := range copy.Configure {
if existing.Name == conf.Name && existing.Purpose == conf.Purpose && existing.Runtime == conf.Runtime {
previous = existing
break
}
}
if previous == nil {
copy.Configure = append(copy.Configure, conf)
totalChangeCount++
continue
}
for _, newConf := range conf.Configuration {
var found bool
for _, existing := range previous.Configuration {
if existing.TypeUrl == newConf.TypeUrl {
if !bytes.Equal(existing.Value, newConf.Value) {
existing.Value = newConf.Value
totalChangeCount++
}
found = true
break
}
}
if !found {
previous.Configuration = append(previous.Configuration, newConf)
totalChangeCount++
}
}
}
return copy, totalChangeCount > 0
}
func RewriteWith(ctx context.Context, fsys fnfs.ReadWriteFS, filename string, devhost *schema.DevHost) error {
serialized, err := (prototext.MarshalOptions{Multiline: true}).Marshal(devhost)
if err != nil {
return err
}
if err := fnfs.WriteWorkspaceFile(ctx, nil, fsys, filename, func(w io.Writer) error {
_, err := w.Write(serialized)
return err
}); err != nil {
return err
}
return nil
}