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configuration.go
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configuration.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 cfg
import (
"strings"
specs "github.com/opencontainers/image-spec/specs-go/v1"
"golang.org/x/exp/slices"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/known/anypb"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/protos"
"namespacelabs.dev/foundation/schema"
)
type Configuration interface {
Derive(string, func(ConfigurationSlice) ConfigurationSlice) Configuration
// When the configuration is loaded pinned to an environment, returns the
// environment name. Else, the return value is undefined. This value MUST
// NOT be used as an authoritative cache key.
EnvKey() string
Workspace() Workspace
checkGetMessage(proto.Message, string, []string) bool
checkGetMessageForPlatform(specs.Platform, proto.Message, string, []string) bool
fetchMultiple(string) []*anypb.Any
}
func GetMultiple[V proto.Message](config Configuration) ([]V, error) {
msgs := config.fetchMultiple(protos.TypeUrl[V]())
var result []V
for _, msg := range msgs {
v, err := msg.UnmarshalNew()
if err != nil {
return nil, err
}
result = append(result, v.(V))
}
return result, nil
}
func MakeConfigurationCompat(errorloc fnerrors.Location, ws Workspace, devHost *schema.DevHost, env *schema.Environment) (Configuration, error) {
var base ConfigurationSlice
for _, spec := range ws.Proto().EnvSpec {
if spec.Name == env.Name {
base.Configuration = spec.Configuration
base.PlatformConfiguration = spec.PlatformConfiguration
}
}
return makeConfigurationCompat(errorloc, ws, base, devHost, env)
}
func makeConfigurationCompat(errorloc fnerrors.Location, ws Workspace, base ConfigurationSlice, devHost *schema.DevHost, env *schema.Environment) (Configuration, error) {
rest := selectByEnv(devHost, env)
rest.PlatformConfiguration = append(rest.PlatformConfiguration, devHost.ConfigurePlatform...)
merged := ConfigurationSlice{
Configuration: append(slices.Clone(base.Configuration), rest.Configuration...),
PlatformConfiguration: append(slices.Clone(base.PlatformConfiguration), rest.PlatformConfiguration...),
}
if p, err := applyProvider(errorloc, merged.Configuration); err == nil {
merged.Configuration = p
} else {
return nil, err
}
for _, plat := range merged.PlatformConfiguration {
if p, err := applyProvider(errorloc, plat.Configuration); err == nil {
plat.Configuration = p
} else {
return nil, err
}
}
return MakeConfigurationWith(env.Name, ws, merged), nil
}
func applyProvider(errorloc fnerrors.Location, merged []*anypb.Any) ([]*anypb.Any, error) {
var parsed []*anypb.Any
for _, m := range merged {
if p, ok := configProviders[m.TypeUrl]; ok {
messages, err := p(m)
if err != nil {
return nil, fnerrors.NewWithLocation(errorloc, "%s: %w", m.TypeUrl, err)
}
for _, msg := range messages {
any, err := anypb.New(msg)
if err != nil {
return nil, fnerrors.InternalError("%s: failed to serialize message: %w", m.TypeUrl, err)
}
parsed = append(parsed, any)
}
} else {
parsed = append(parsed, m)
}
}
return parsed, nil
}
func MakeConfigurationWith(description string, ws Workspace, merged ConfigurationSlice) Configuration {
return config{description, ws, merged}
}
type ConfigurationSlice struct {
Configuration []*anypb.Any
PlatformConfiguration []*schema.DevHost_ConfigurePlatform
}
type config struct {
envKey string
workspace Workspace
atoms ConfigurationSlice
}
func (cfg config) Workspace() Workspace {
return cfg.workspace
}
func (cfg config) checkGetMessage(msg proto.Message, name string, aliases []string) bool {
return checkGet(cfg.atoms.Configuration, msg, name, aliases)
}
func (cfg config) fetchMultiple(typeUrl string) []*anypb.Any {
var response []*anypb.Any
for _, m := range cfg.atoms.Configuration {
if m.TypeUrl == typeUrl {
response = append(response, m)
}
}
return response
}
func checkGet(merged []*anypb.Any, msg proto.Message, name string, aliases []string) bool {
for _, conf := range merged {
if messageIs(conf, name, aliases) {
// XXX we're swallowing errors here.
if proto.Unmarshal(conf.Value, msg) == nil {
return true
}
}
}
return false
}
func messageIs(x *anypb.Any, name string, aliases []string) bool {
url := x.GetTypeUrl()
if matchTypeUrl(url, name) {
return true
}
for _, alias := range aliases {
if matchTypeUrl(url, alias) {
return true
}
}
return false
}
func matchTypeUrl(url, name string) bool {
if !strings.HasSuffix(url, name) {
return false
}
return len(url) == len(name) || url[len(url)-len(name)-1] == '/'
}
func (cfg config) checkGetMessageForPlatform(target specs.Platform, msg proto.Message, name string, aliases []string) bool {
for _, p := range cfg.atoms.PlatformConfiguration {
if platformMatches(p, target) {
if checkGet(p.Configuration, msg, name, aliases) {
return true
}
break
}
}
return cfg.checkGetMessage(msg, name, aliases)
}
func (cfg config) EnvKey() string {
return cfg.envKey
}
func (cfg config) Derive(envKey string, f func(ConfigurationSlice) ConfigurationSlice) Configuration {
return config{
envKey: envKey,
workspace: cfg.workspace,
atoms: f(cfg.atoms),
}
}
func selectByEnv(devHost *schema.DevHost, env *schema.Environment) ConfigurationSlice {
var slice ConfigurationSlice
for _, cfg := range devHost.GetConfigure() {
if cfg.Purpose != 0 && cfg.Purpose != env.GetPurpose() {
continue
}
if cfg.Runtime != "" && cfg.Runtime != env.GetRuntime() {
continue
}
if cfg.Name != "" && cfg.Name != env.GetName() {
continue
}
slice.Configuration = append(slice.Configuration, cfg.Configuration...)
slice.PlatformConfiguration = append(slice.PlatformConfiguration, cfg.PlatformConfiguration...)
}
return slice
}
func platformMatches(a *schema.DevHost_ConfigurePlatform, b specs.Platform) bool {
if a.Architecture != "" && a.Architecture != b.Architecture {
return false
}
if a.Os != "" && a.Os != b.OS {
return false
}
if a.Variant != "" && a.Variant != b.Variant {
return false
}
return true
}