116 lines
3.0 KiB
Go
116 lines
3.0 KiB
Go
package gojay
|
|
|
|
import (
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
// UnmarshalerStream is the interface to implement for a slice, an array or a slice
|
|
// to decode a line delimited JSON to.
|
|
type UnmarshalerStream interface {
|
|
UnmarshalStream(*StreamDecoder) error
|
|
}
|
|
|
|
// Stream is a struct holding the Stream api
|
|
var Stream = stream{}
|
|
|
|
type stream struct{}
|
|
|
|
// A StreamDecoder reads and decodes JSON values from an input stream.
|
|
//
|
|
// It implements conext.Context and provide a channel to notify interruption.
|
|
type StreamDecoder struct {
|
|
mux sync.RWMutex
|
|
*Decoder
|
|
done chan struct{}
|
|
deadline *time.Time
|
|
}
|
|
|
|
// DecodeStream reads the next line delimited JSON-encoded value from the decoder's input (io.Reader) and stores it in the value pointed to by c.
|
|
//
|
|
// c must implement UnmarshalerStream. Ideally c is a channel. See example for implementation.
|
|
//
|
|
// See the documentation for Unmarshal for details about the conversion of JSON into a Go value.
|
|
func (dec *StreamDecoder) DecodeStream(c UnmarshalerStream) error {
|
|
if dec.isPooled == 1 {
|
|
panic(InvalidUsagePooledDecoderError("Invalid usage of pooled decoder"))
|
|
}
|
|
if dec.r == nil {
|
|
dec.err = NoReaderError("No reader given to decode stream")
|
|
close(dec.done)
|
|
return dec.err
|
|
}
|
|
for ; dec.cursor < dec.length || dec.read(); dec.cursor++ {
|
|
switch dec.data[dec.cursor] {
|
|
case ' ', '\n', '\t', '\r', ',':
|
|
continue
|
|
default:
|
|
// char is not space start reading
|
|
for dec.nextChar() != 0 {
|
|
// calling unmarshal stream
|
|
err := c.UnmarshalStream(dec)
|
|
if err != nil {
|
|
dec.err = err
|
|
close(dec.done)
|
|
return err
|
|
}
|
|
// garbage collects buffer
|
|
// we don't want the buffer to grow extensively
|
|
dec.data = dec.data[dec.cursor:]
|
|
dec.length = dec.length - dec.cursor
|
|
dec.cursor = 0
|
|
}
|
|
// close the done channel to signal the end of the job
|
|
close(dec.done)
|
|
return nil
|
|
}
|
|
}
|
|
close(dec.done)
|
|
dec.mux.Lock()
|
|
err := dec.raiseInvalidJSONErr(dec.cursor)
|
|
dec.mux.Unlock()
|
|
return err
|
|
}
|
|
|
|
// context.Context implementation
|
|
|
|
// Done returns a channel that's closed when work is done.
|
|
// It implements context.Context
|
|
func (dec *StreamDecoder) Done() <-chan struct{} {
|
|
return dec.done
|
|
}
|
|
|
|
// Deadline returns the time when work done on behalf of this context
|
|
// should be canceled. Deadline returns ok==false when no deadline is
|
|
// set. Successive calls to Deadline return the same results.
|
|
func (dec *StreamDecoder) Deadline() (time.Time, bool) {
|
|
if dec.deadline != nil {
|
|
return *dec.deadline, true
|
|
}
|
|
return time.Time{}, false
|
|
}
|
|
|
|
// SetDeadline sets the deadline
|
|
func (dec *StreamDecoder) SetDeadline(t time.Time) {
|
|
dec.deadline = &t
|
|
}
|
|
|
|
// Err returns nil if Done is not yet closed.
|
|
// If Done is closed, Err returns a non-nil error explaining why.
|
|
// It implements context.Context
|
|
func (dec *StreamDecoder) Err() error {
|
|
select {
|
|
case <-dec.done:
|
|
dec.mux.RLock()
|
|
defer dec.mux.RUnlock()
|
|
return dec.err
|
|
default:
|
|
return nil
|
|
}
|
|
}
|
|
|
|
// Value implements context.Context
|
|
func (dec *StreamDecoder) Value(key interface{}) interface{} {
|
|
return nil
|
|
}
|