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payload.go
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payload.go
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package payload
import (
"bytes"
"io/ioutil"
"time"
"github.com/rsocket/rsocket-go/core"
"github.com/rsocket/rsocket-go/internal/common"
)
type (
// Payload is a stream message (upstream or downstream).
// It contains data associated with a stream created by a previous request.
// In Reactive Streams and Rx this is the 'onNext' event.
Payload interface {
// Metadata returns raw metadata bytes.
// The ok result indicates whether metadata exists.
Metadata() (metadata []byte, ok bool)
// MetadataUTF8 returns metadata as UTF8 string.
// The ok result indicates whether metadata exists.
MetadataUTF8() (metadata string, ok bool)
// Data returns raw data bytes.
Data() []byte
// DataUTF8 returns data as UTF8 string.
DataUTF8() string
}
// SetupPayload is particular payload for RSocket Setup.
SetupPayload interface {
Payload
// DataMimeType returns MIME type of data.
DataMimeType() string
// MetadataMimeType returns MIME type of metadata.
MetadataMimeType() string
// TimeBetweenKeepalive returns interval duration of keepalive.
TimeBetweenKeepalive() time.Duration
// MaxLifetime returns max lifetime of RSocket connection.
MaxLifetime() time.Duration
// Version return RSocket protocol version.
Version() core.Version
}
)
// Clone create a copy of original payload.
func Clone(payload Payload) Payload {
if payload == nil {
return nil
}
switch v := payload.(type) {
case *rawPayload:
data := common.CloneBytes(v.data)
metadata := common.CloneBytes(v.metadata)
return &rawPayload{
data: data,
metadata: metadata,
}
case *strPayload:
return &strPayload{
data: v.data,
metadata: v.metadata,
}
default:
data := common.CloneBytes(v.Data())
metadata, _ := v.Metadata()
metadata = common.CloneBytes(metadata)
return &rawPayload{
data: data,
metadata: metadata,
}
}
}
// New create a new payload with bytes.
func New(data []byte, metadata []byte) Payload {
return &rawPayload{
data: data,
metadata: metadata,
}
}
// NewString create a new payload with strings.
func NewString(data, metadata string) Payload {
return &strPayload{
data: data,
metadata: metadata,
}
}
// NewFile create a new payload from file.
func NewFile(filename string, metadata []byte) (Payload, error) {
bs, err := ioutil.ReadFile(filename)
if err != nil {
return nil, err
}
return New(bs, metadata), nil
}
// MustNewFile create a new payload from file.
func MustNewFile(filename string, metadata []byte) Payload {
foo, err := NewFile(filename, metadata)
if err != nil {
panic(err)
}
return foo
}
// Equal returns true if payloads have same data and metadata.
func Equal(a Payload, b Payload) bool {
if a == b {
return true
}
if !bytes.Equal(a.Data(), b.Data()) {
return false
}
m1, ok1 := a.Metadata()
m2, ok2 := b.Metadata()
if ok1 != ok2 {
return false
}
return bytes.Equal(m1, m2)
}