mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
339 lines
6.7 KiB
Go
339 lines
6.7 KiB
Go
package engine
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"sort"
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"strconv"
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"strings"
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)
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type Env []string
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func (env *Env) Get(key string) (value string) {
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// FIXME: use Map()
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for _, kv := range *env {
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if strings.Index(kv, "=") == -1 {
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continue
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}
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parts := strings.SplitN(kv, "=", 2)
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if parts[0] != key {
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continue
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}
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if len(parts) < 2 {
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value = ""
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} else {
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value = parts[1]
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}
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}
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return
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}
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func (env *Env) Exists(key string) bool {
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_, exists := env.Map()[key]
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return exists
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}
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func (env *Env) GetBool(key string) (value bool) {
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s := strings.ToLower(strings.Trim(env.Get(key), " \t"))
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if s == "" || s == "0" || s == "no" || s == "false" || s == "none" {
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return false
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}
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return true
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}
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func (env *Env) SetBool(key string, value bool) {
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if value {
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env.Set(key, "1")
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} else {
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env.Set(key, "0")
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}
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}
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func (env *Env) GetInt(key string) int {
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return int(env.GetInt64(key))
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}
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func (env *Env) GetInt64(key string) int64 {
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s := strings.Trim(env.Get(key), " \t")
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val, err := strconv.ParseInt(s, 10, 64)
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if err != nil {
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return -1
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}
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return val
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}
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func (env *Env) SetInt(key string, value int) {
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env.Set(key, fmt.Sprintf("%d", value))
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}
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func (env *Env) SetInt64(key string, value int64) {
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env.Set(key, fmt.Sprintf("%d", value))
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}
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// Returns nil if key not found
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func (env *Env) GetList(key string) []string {
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sval := env.Get(key)
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if sval == "" {
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return nil
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}
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l := make([]string, 0, 1)
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if err := json.Unmarshal([]byte(sval), &l); err != nil {
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l = append(l, sval)
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}
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return l
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}
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func (env *Env) GetJson(key string, iface interface{}) error {
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sval := env.Get(key)
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if sval == "" {
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return nil
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}
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return json.Unmarshal([]byte(sval), iface)
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}
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func (env *Env) SetJson(key string, value interface{}) error {
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sval, err := json.Marshal(value)
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if err != nil {
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return err
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}
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env.Set(key, string(sval))
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return nil
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}
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func (env *Env) SetList(key string, value []string) error {
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return env.SetJson(key, value)
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}
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func (env *Env) Set(key, value string) {
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*env = append(*env, key+"="+value)
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}
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func NewDecoder(src io.Reader) *Decoder {
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return &Decoder{
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json.NewDecoder(src),
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}
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}
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type Decoder struct {
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*json.Decoder
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}
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func (decoder *Decoder) Decode() (*Env, error) {
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m := make(map[string]interface{})
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if err := decoder.Decoder.Decode(&m); err != nil {
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return nil, err
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}
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env := &Env{}
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for key, value := range m {
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env.SetAuto(key, value)
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}
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return env, nil
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}
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// DecodeEnv decodes `src` as a json dictionary, and adds
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// each decoded key-value pair to the environment.
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//
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// If `src` cannot be decoded as a json dictionary, an error
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// is returned.
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func (env *Env) Decode(src io.Reader) error {
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m := make(map[string]interface{})
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if err := json.NewDecoder(src).Decode(&m); err != nil {
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return err
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}
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for k, v := range m {
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env.SetAuto(k, v)
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}
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return nil
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}
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func (env *Env) SetAuto(k string, v interface{}) {
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// FIXME: we fix-convert float values to int, because
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// encoding/json decodes integers to float64, but cannot encode them back.
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// (See http://golang.org/src/pkg/encoding/json/decode.go#L46)
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if fval, ok := v.(float64); ok {
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env.SetInt64(k, int64(fval))
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} else if sval, ok := v.(string); ok {
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env.Set(k, sval)
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} else if val, err := json.Marshal(v); err == nil {
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env.Set(k, string(val))
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} else {
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env.Set(k, fmt.Sprintf("%v", v))
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}
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}
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func (env *Env) Encode(dst io.Writer) error {
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m := make(map[string]interface{})
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for k, v := range env.Map() {
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var val interface{}
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if err := json.Unmarshal([]byte(v), &val); err == nil {
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// FIXME: we fix-convert float values to int, because
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// encoding/json decodes integers to float64, but cannot encode them back.
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// (See http://golang.org/src/pkg/encoding/json/decode.go#L46)
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if fval, isFloat := val.(float64); isFloat {
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val = int(fval)
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}
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m[k] = val
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} else {
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m[k] = v
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}
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}
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if err := json.NewEncoder(dst).Encode(&m); err != nil {
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return err
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}
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return nil
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}
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func (env *Env) WriteTo(dst io.Writer) (n int64, err error) {
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// FIXME: return the number of bytes written to respect io.WriterTo
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return 0, env.Encode(dst)
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}
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func (env *Env) Export(dst interface{}) (err error) {
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defer func() {
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if err != nil {
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err = fmt.Errorf("ExportEnv %s", err)
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}
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}()
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var buf bytes.Buffer
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// step 1: encode/marshal the env to an intermediary json representation
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if err := env.Encode(&buf); err != nil {
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return err
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}
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// step 2: decode/unmarshal the intermediary json into the destination object
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if err := json.NewDecoder(&buf).Decode(dst); err != nil {
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return err
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}
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return nil
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}
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func (env *Env) Import(src interface{}) (err error) {
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defer func() {
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if err != nil {
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err = fmt.Errorf("ImportEnv: %s", err)
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}
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}()
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var buf bytes.Buffer
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if err := json.NewEncoder(&buf).Encode(src); err != nil {
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return err
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}
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if err := env.Decode(&buf); err != nil {
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return err
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}
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return nil
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}
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func (env *Env) Map() map[string]string {
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m := make(map[string]string)
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for _, kv := range *env {
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parts := strings.SplitN(kv, "=", 2)
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m[parts[0]] = parts[1]
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}
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return m
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}
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type Table struct {
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Data []*Env
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sortKey string
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Chan chan *Env
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}
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func NewTable(sortKey string, sizeHint int) *Table {
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return &Table{
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make([]*Env, 0, sizeHint),
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sortKey,
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make(chan *Env),
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}
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}
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func (t *Table) SetKey(sortKey string) {
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t.sortKey = sortKey
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}
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func (t *Table) Add(env *Env) {
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t.Data = append(t.Data, env)
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}
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func (t *Table) Len() int {
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return len(t.Data)
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}
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func (t *Table) Less(a, b int) bool {
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return t.lessBy(a, b, t.sortKey)
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}
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func (t *Table) lessBy(a, b int, by string) bool {
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keyA := t.Data[a].Get(by)
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keyB := t.Data[b].Get(by)
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intA, errA := strconv.ParseInt(keyA, 10, 64)
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intB, errB := strconv.ParseInt(keyB, 10, 64)
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if errA == nil && errB == nil {
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return intA < intB
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}
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return keyA < keyB
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}
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func (t *Table) Swap(a, b int) {
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tmp := t.Data[a]
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t.Data[a] = t.Data[b]
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t.Data[b] = tmp
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}
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func (t *Table) Sort() {
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sort.Sort(t)
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}
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func (t *Table) ReverseSort() {
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sort.Sort(sort.Reverse(t))
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}
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func (t *Table) WriteListTo(dst io.Writer) (n int64, err error) {
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if _, err := dst.Write([]byte{'['}); err != nil {
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return -1, err
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}
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n = 1
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for i, env := range t.Data {
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bytes, err := env.WriteTo(dst)
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if err != nil {
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return -1, err
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}
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n += bytes
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if i != len(t.Data)-1 {
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if _, err := dst.Write([]byte{','}); err != nil {
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return -1, err
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}
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n += 1
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}
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}
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if _, err := dst.Write([]byte{']'}); err != nil {
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return -1, err
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}
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return n + 1, nil
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}
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func (t *Table) WriteTo(dst io.Writer) (n int64, err error) {
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for _, env := range t.Data {
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bytes, err := env.WriteTo(dst)
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if err != nil {
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return -1, err
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}
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n += bytes
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}
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return n, nil
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}
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func (t *Table) ReadFrom(src io.Reader) (n int64, err error) {
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decoder := NewDecoder(src)
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for {
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env, err := decoder.Decode()
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if err == io.EOF {
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return 0, nil
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} else if err != nil {
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return -1, err
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}
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t.Add(env)
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}
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return 0, nil
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}
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