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api.go
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139 lines (112 loc) · 2.75 KB
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package hyperliquid
import (
"encoding/json"
"fmt"
"sync"
"github.com/valyala/fastjson"
)
// Pool of parsers to avoid allocations
var parserPool = sync.Pool{
New: func() any {
return &fastjson.Parser{}
},
}
type APIResponse[T any] struct {
Status string
Data T
Type string
Err string
Ok bool
}
func (r *APIResponse[T]) UnmarshalJSON(data []byte) error {
fmt.Printf("Unmarshalling API response: %s\n", string(data))
// Get parser from pool
parser := parserPool.Get().(*fastjson.Parser)
defer parserPool.Put(parser)
parsed, err := parser.ParseBytes(data)
if err != nil {
return fmt.Errorf("failed to parse JSON response: %w", err)
}
// Get status
r.Status = string(parsed.GetStringBytes("status"))
r.Ok = r.Status == "ok"
if !r.Ok {
// When status is not "ok", "response" is usually a string error message
r.Err = string(parsed.GetStringBytes("response"))
return nil
}
// When status is "ok", "response" contains "type" and "data"
r.Type = string(parsed.GetStringBytes("response", "type"))
// GetStringBytes() only works on string, we should do a Get instead
responseData := parsed.Get("response", "data")
if responseData == nil {
return fmt.Errorf("missing response.data field in successful response")
}
b := responseData.MarshalTo(nil)
// Use fastjson's built-in unmarshaling if possible, fallback to json.Unmarshal
if err := json.Unmarshal(b, &r.Data); err != nil {
return fmt.Errorf("failed to unmarshal response data: %w", err)
}
return nil
}
type MixedValue json.RawMessage
func (mv *MixedValue) UnmarshalJSON(data []byte) error {
*mv = data
return nil
}
func (mv MixedValue) MarshalJSON() ([]byte, error) {
return mv, nil
}
func (mv *MixedValue) String() (string, bool) {
var s string
if err := json.Unmarshal(*mv, &s); err != nil {
return "", false
}
return s, true
}
func (mv *MixedValue) Object() (map[string]any, bool) {
var obj map[string]any
if err := json.Unmarshal(*mv, &obj); err != nil {
return nil, false
}
return obj, true
}
func (mv *MixedValue) Array() ([]json.RawMessage, bool) {
var arr []json.RawMessage
if err := json.Unmarshal(*mv, &arr); err != nil {
return nil, false
}
return arr, true
}
func (mv *MixedValue) Parse(v any) error {
return json.Unmarshal(*mv, v)
}
func (mv *MixedValue) Type() string {
if mv == nil || len(*mv) == 0 {
return "null"
}
first := (*mv)[0]
switch first {
case '"':
return "string"
case '{':
return "object"
case '[':
return "array"
case 't', 'f':
return "boolean"
case 'n':
return "null"
default:
return "number"
}
}
type MixedArray []MixedValue
func (ma *MixedArray) UnmarshalJSON(data []byte) error {
var rawArr []MixedValue
if err := json.Unmarshal(data, &rawArr); err != nil {
return err
}
*ma = rawArr
return nil
}