132 lines
3.1 KiB
Go
132 lines
3.1 KiB
Go
package taskenv
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"strings"
|
|
|
|
"github.com/zclconf/go-cty/cty"
|
|
)
|
|
|
|
var (
|
|
// ErrInvalidObjectPath is returned when a key cannot be converted into
|
|
// a nested object path like "foo...bar", ".foo", or "foo."
|
|
ErrInvalidObjectPath = errors.New("invalid object path")
|
|
)
|
|
|
|
type ErrKeyExists struct {
|
|
msg string
|
|
}
|
|
|
|
func NewErrKeyExists(newKey, oldKey string) *ErrKeyExists {
|
|
return &ErrKeyExists{
|
|
msg: fmt.Sprintf(
|
|
"cannot add key %q because %q already exists with a different type",
|
|
newKey, oldKey,
|
|
),
|
|
}
|
|
}
|
|
|
|
func (e *ErrKeyExists) Error() string {
|
|
return e.msg
|
|
}
|
|
|
|
// addNestedKey expands keys into their nested form:
|
|
//
|
|
// k="foo.bar", v="quux" -> {"foo": {"bar": "quux"}}
|
|
//
|
|
// Existing keys are overwritten.
|
|
//
|
|
// If the key has dots but cannot be converted to a valid nested data structure
|
|
// (eg "foo...bar", "foo.", or non-object value exists for key), an error is
|
|
// returned.
|
|
func addNestedKey(dst map[string]interface{}, k, v string) error {
|
|
// createdParent and Key capture the parent object of the first created
|
|
// object and the first created object's key respectively. The cleanup
|
|
// func deletes them to prevent side-effects when returning errors.
|
|
var createdParent map[string]interface{}
|
|
var createdKey string
|
|
cleanup := func() {
|
|
if createdParent != nil {
|
|
delete(createdParent, createdKey)
|
|
}
|
|
}
|
|
|
|
segments := strings.Split(k, ".")
|
|
for _, newKey := range segments[:len(segments)-1] {
|
|
if newKey == "" {
|
|
// String either begins with a dot (.foo) or has at
|
|
// least two consecutive dots (foo..bar); either way
|
|
// it's an invalid object path.
|
|
cleanup()
|
|
return ErrInvalidObjectPath
|
|
}
|
|
|
|
var target map[string]interface{}
|
|
if existingI, ok := dst[newKey]; ok {
|
|
existing, ok := existingI.(map[string]interface{})
|
|
if !ok {
|
|
// Existing value is not a map, unable to support this key
|
|
cleanup()
|
|
return NewErrKeyExists(k, newKey)
|
|
}
|
|
target = existing
|
|
} else {
|
|
// Does not exist, create
|
|
target = make(map[string]interface{})
|
|
dst[newKey] = target
|
|
|
|
// If this is the first created key, capture it for
|
|
// cleanup if there is an error later.
|
|
if createdParent == nil {
|
|
createdParent = dst
|
|
createdKey = newKey
|
|
}
|
|
}
|
|
|
|
// Descend into new m
|
|
dst = target
|
|
}
|
|
|
|
// See if the final segment is a valid key
|
|
newKey := segments[len(segments)-1]
|
|
if newKey == "" {
|
|
// String ends in a dot
|
|
cleanup()
|
|
return ErrInvalidObjectPath
|
|
}
|
|
|
|
dst[newKey] = v
|
|
return nil
|
|
}
|
|
|
|
// ctyify converts nested map[string]interfaces to a map[string]cty.Value. An
|
|
// error is returned if an unsupported type is encountered.
|
|
//
|
|
// Currently only strings, cty.Values, and nested maps are supported.
|
|
func ctyify(src map[string]interface{}) (map[string]cty.Value, error) {
|
|
dst := make(map[string]cty.Value, len(src))
|
|
|
|
for k, vI := range src {
|
|
switch v := vI.(type) {
|
|
case string:
|
|
dst[k] = cty.StringVal(v)
|
|
|
|
case cty.Value:
|
|
dst[k] = v
|
|
|
|
case map[string]interface{}:
|
|
o, err := ctyify(v)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
dst[k] = cty.ObjectVal(o)
|
|
|
|
default:
|
|
return nil, fmt.Errorf("key %q has invalid type %T", k, v)
|
|
}
|
|
}
|
|
|
|
return dst, nil
|
|
}
|