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support.go
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support.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 provider
import (
"context"
"encoding/json"
"flag"
"fmt"
"log"
"reflect"
"namespacelabs.dev/foundation/framework/resources"
)
const ProtocolVersion = "1"
type Message struct {
Version string `json:"version"`
SerializedInstanceJSON *string `json:"serialized_instance,omitempty"`
// TODO add orchestration event.
}
type ProviderContext struct {
ProtocolVersion string `json:"protocol_version"`
}
type Provider[T any] struct {
Context ProviderContext
Intent T
Resources *resources.Parsed
}
func MustPrepare[T any]() (context.Context, *Provider[T]) {
intentFlag := flag.String("intent", "", "The serialized JSON intent.")
resourcesFlag := flag.String("resources", "", "The serialized JSON resources.")
providerCtxFlag := flag.String("provider_context", "", "The serialized JSON of a provider request.")
flag.Parse()
var pctx ProviderContext
if *providerCtxFlag != "" {
if err := json.Unmarshal([]byte(*providerCtxFlag), &pctx); err != nil {
log.Fatalf("failed to parse provider context: %v", err)
}
} else {
pctx.ProtocolVersion = "0"
}
var intentT T
intent := reflect.New(reflect.TypeOf(intentT).Elem()).Interface().(T)
resources, err := prepare(*intentFlag, *resourcesFlag, intent)
if err != nil {
log.Fatal(err.Error())
}
return context.Background(), &Provider[T]{Context: pctx, Intent: intent, Resources: resources}
}
func (p *Provider[T]) EmitResult(instance any) {
serialized, err := json.Marshal(instance)
if err != nil {
log.Fatalf("failed to marshal instance: %v", err)
}
switch p.Context.ProtocolVersion {
case "0":
// Backwards compatibility.
fmt.Printf("namespace.provision.result: %s\n", serialized)
default:
str := string(serialized)
p.emitMessage(Message{SerializedInstanceJSON: &str})
}
}
func (p *Provider[T]) emitMessage(message Message) {
message.Version = ProtocolVersion
serialized, err := json.Marshal(message)
if err != nil {
log.Fatalf("failed to marshal instance: %v", err)
}
fmt.Printf("namespace.provision.message: %s\n", serialized)
}
func prepare(intentFlag, resourcesFlag string, intent any) (*resources.Parsed, error) {
if intentFlag != "" {
if err := json.Unmarshal([]byte(intentFlag), intent); err != nil {
return nil, fmt.Errorf("failed to decode intent: %w", err)
}
}
if resourcesFlag == "" {
return nil, fmt.Errorf("--resources is required")
}
return resources.ParseResourceData([]byte(resourcesFlag))
}