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env.go
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env.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 args
import (
"bytes"
"context"
"encoding/json"
"strings"
"golang.org/x/exp/maps"
"golang.org/x/exp/slices"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/parsing/invariants"
"namespacelabs.dev/foundation/schema"
"namespacelabs.dev/foundation/std/pkggraph"
)
type EnvMap struct {
Values map[string]envValue
}
type envValue struct {
value string
fromSecret string
fromServiceEndpoint string
fromServiceIngress string
experimentalFromDownwardsFieldPath string
fromResourceField *resourceFieldSyntax
}
var _ json.Unmarshaler = &EnvMap{}
var _ json.Unmarshaler = &envValue{}
func (cem *EnvMap) UnmarshalJSON(data []byte) error {
var values map[string]envValue
if err := json.Unmarshal(data, &values); err != nil {
return err
}
cem.Values = values
return nil
}
func (cem *EnvMap) Parsed(ctx context.Context, pl pkggraph.PackageLoader, owner schema.PackageName) ([]*schema.BinaryConfig_EnvEntry, error) {
if cem == nil {
return nil, nil
}
var env []*schema.BinaryConfig_EnvEntry
for key, value := range cem.Values {
out := &schema.BinaryConfig_EnvEntry{
Name: key,
}
switch {
case value.value != "":
out.Value = value.value
case value.fromSecret != "":
secretRef, err := schema.ParsePackageRef(owner, value.fromSecret)
if err != nil {
return nil, err
}
if err := invariants.EnsurePackageLoaded(ctx, pl, owner, secretRef); err != nil {
return nil, err
}
out.FromSecretRef = secretRef
case value.fromServiceEndpoint != "":
serviceRef, err := schema.ParsePackageRef(owner, value.fromServiceEndpoint)
if err != nil {
return nil, err
}
if err := invariants.EnsurePackageLoaded(ctx, pl, owner, serviceRef); err != nil {
return nil, err
}
out.FromServiceEndpoint = &schema.ServiceRef{
ServerRef: &schema.PackageRef{PackageName: serviceRef.PackageName},
ServiceName: serviceRef.Name,
}
case value.fromServiceIngress != "":
serviceRef, err := schema.ParsePackageRef(owner, value.fromServiceIngress)
if err != nil {
return nil, err
}
if err := invariants.EnsurePackageLoaded(ctx, pl, owner, serviceRef); err != nil {
return nil, err
}
out.FromServiceIngress = &schema.ServiceRef{
ServerRef: &schema.PackageRef{PackageName: serviceRef.PackageName},
ServiceName: serviceRef.Name,
}
case value.fromResourceField != nil:
resourceRef, err := schema.ParsePackageRef(owner, value.fromResourceField.Resource)
if err != nil {
return nil, err
}
if err := invariants.EnsurePackageLoaded(ctx, pl, owner, resourceRef); err != nil {
return nil, err
}
out.FromResourceField = &schema.ResourceConfigFieldSelector{
Resource: resourceRef,
FieldSelector: value.fromResourceField.FieldRef,
}
case value.experimentalFromDownwardsFieldPath != "":
out.ExperimentalFromDownwardsFieldPath = value.experimentalFromDownwardsFieldPath
}
env = append(env, out)
}
slices.SortFunc(env, func(a, b *schema.BinaryConfig_EnvEntry) bool {
return strings.Compare(a.Name, b.Name) < 0
})
return env, nil
}
var validKeys = []string{"fromSecret", "fromServiceEndpoint", "fromServiceIngress", "fromResourceField", "experimentalFromDownwardsFieldPath"}
func (ev *envValue) UnmarshalJSON(data []byte) error {
d := json.NewDecoder(bytes.NewReader(data))
tok, err := d.Token()
if err != nil {
return err
}
if tok == json.Delim('{') {
var m map[string]any
if err := json.Unmarshal(data, &m); err != nil {
return err
}
keys := maps.Keys(m)
if len(keys) != 1 || !slices.Contains(validKeys, keys[0]) {
return fnerrors.BadInputError("when setting an object to a env var map, expected a single key, one of %s", strings.Join(validKeys, ", "))
}
var err error
switch keys[0] {
case "fromSecret":
ev.fromSecret, err = mustString("fromSecret", m[keys[0]])
case "fromServiceEndpoint":
ev.fromServiceEndpoint, err = mustString("fromServiceEndpoint", m[keys[0]])
case "fromServiceIngress":
ev.fromServiceIngress, err = mustString("fromServiceIngress", m[keys[0]])
case "fromResourceField":
var ref resourceFieldSyntax
if err := reUnmarshal(m[keys[0]], &ref); err != nil {
return fnerrors.BadInputError("failed to parse fromResourceField: %w", err)
}
ev.fromResourceField = &ref
return nil
case "experimentalFromDownwardsFieldPath":
ev.experimentalFromDownwardsFieldPath, err = mustString("experimentalFromDownwardsFieldPath", m[keys[0]])
}
return err
}
if str, ok := tok.(string); ok {
ev.value = str
return nil
}
return fnerrors.BadInputError("failed to parse value, unexpected token %v", tok)
}
func mustString(what string, value any) (string, error) {
if str, ok := value.(string); ok {
return str, nil
}
return "", fnerrors.BadInputError("%s: expected a string", what)
}
func reUnmarshal(value any, target any) error {
bytes, err := json.Marshal(value)
if err != nil {
return err
}
return json.Unmarshal(bytes, target)
}
type resourceFieldSyntax struct {
Resource string `json:"resource"`
FieldRef string `json:"fieldRef"`
}