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metadata.go
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metadata.go
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package safe
import (
"database/sql/driver"
"encoding/json"
"fmt"
"net/http"
"reflect"
"strings"
"sync"
"github.com/mitchellh/mapstructure"
"gopkg.in/yaml.v3"
)
// Metadata is a thread-safe key-value store.
// There are some gotchas when using this struct:
// json marshalling is supported but all number will be parsed as float64.
// yaml marshalling is supported but all number will be parsed as int.
type Metadata struct {
kv map[string]any
mu sync.Mutex
}
func (meta *Metadata) Set(k string, v any) {
meta.mu.Lock()
defer meta.mu.Unlock()
if meta.kv == nil {
meta.kv = make(map[string]any)
}
meta.kv[k] = v
}
func (meta *Metadata) Get(k string) (any, bool) {
meta.mu.Lock()
defer meta.mu.Unlock()
if meta.kv == nil {
return nil, false
}
v, has := meta.kv[k]
return v, has
}
func (meta *Metadata) Merge(src *Metadata) {
meta.mu.Lock()
defer meta.mu.Unlock()
if meta.kv == nil {
meta.kv = make(map[string]any)
}
if src == nil || len(src.kv) == 0 {
return
}
for k := range src.kv {
meta.kv[k] = src.kv[k]
}
}
func (meta *Metadata) String() string {
if meta == nil || meta.kv == nil {
return ""
}
data, _ := json.Marshal(meta.kv)
return string(data)
}
// Value implements the driver Valuer interface.
func (meta *Metadata) Value() (driver.Value, error) {
// meta == nil when we convert it to database value
if meta == nil || meta.kv == nil {
return "", nil
}
data, err := json.Marshal(meta.kv)
return string(data), err
}
// Scan implements the Scanner interface.
func (meta *Metadata) Scan(value any) error {
v := value.(string)
if v == "" {
return nil
}
return json.Unmarshal([]byte(v), &meta.kv)
}
func (meta *Metadata) MarshalJSON() ([]byte, error) {
return json.Marshal(meta.kv)
}
func (meta *Metadata) UnmarshalJSON(data []byte) error {
return json.Unmarshal(data, &meta.kv)
}
func (meta *Metadata) MarshalYAML() (interface{}, error) {
var value yaml.Node
return value, value.Encode(meta.kv)
}
func (meta *Metadata) UnmarshalYAML(value *yaml.Node) error {
return value.Decode(&meta.kv)
}
func (meta *Metadata) FromHttpHeader(headers http.Header) {
for k, v := range headers {
meta.Set(strings.ToLower(k), v[0])
}
}
func (meta *Metadata) ToHttpHeader() http.Header {
headers := http.Header{}
for k, v := range meta.kv {
switch value := v.(type) {
case string:
headers.Set(k, value)
case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64:
headers.Set(k, fmt.Sprintf("%d", value))
case float32, float64:
headers.Set(k, fmt.Sprintf("%f", value))
case bool:
headers.Set(k, fmt.Sprintf("%t", value))
// ignore other cases
}
}
return headers
}
func MetadataMapstructureHook() mapstructure.DecodeHookFuncType {
return func(from, to reflect.Type, data interface{}) (interface{}, error) {
if from.Kind() == reflect.Map && to.String() == "*safe.Metadata" {
var metdata Metadata
for k, v := range data.(map[string]interface{}) {
metdata.Set(k, v)
}
return &metdata, nil
}
return data, nil
}
}