forked from cerc-io/ipld-eth-server
83 lines
1.9 KiB
Go
83 lines
1.9 KiB
Go
package encoding
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import (
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"bytes"
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"io"
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"sync"
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cbor "github.com/polydawn/refmt/cbor"
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"github.com/polydawn/refmt/obj/atlas"
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)
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type proxyWriter struct {
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w io.Writer
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}
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func (w *proxyWriter) Write(b []byte) (int, error) {
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return w.w.Write(b)
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}
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// Marshaller is a reusbale CBOR marshaller.
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type Marshaller struct {
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marshal *cbor.Marshaller
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writer proxyWriter
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}
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// NewMarshallerAtlased constructs a new cbor Marshaller using the given atlas.
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func NewMarshallerAtlased(atl atlas.Atlas) *Marshaller {
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m := new(Marshaller)
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m.marshal = cbor.NewMarshallerAtlased(&m.writer, atl)
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return m
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}
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// Encode encodes the given object to the given writer.
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func (m *Marshaller) Encode(obj interface{}, w io.Writer) error {
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m.writer.w = w
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err := m.marshal.Marshal(obj)
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m.writer.w = nil
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return err
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}
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// Marshal marshels the given object to a byte slice.
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func (m *Marshaller) Marshal(obj interface{}) ([]byte, error) {
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var buf bytes.Buffer
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if err := m.Encode(obj, &buf); err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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}
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// PooledMarshaller is a thread-safe pooled CBOR marshaller.
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type PooledMarshaller struct {
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pool sync.Pool
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}
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// NewPooledMarshaller returns a PooledMarshaller with the given atlas. Do not
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// copy after use.
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func NewPooledMarshaller(atl atlas.Atlas) PooledMarshaller {
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return PooledMarshaller{
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pool: sync.Pool{
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New: func() interface{} {
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return NewMarshallerAtlased(atl)
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},
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},
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}
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}
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// Marshal marshals the passed object using the pool of marshallers.
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func (p *PooledMarshaller) Marshal(obj interface{}) ([]byte, error) {
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m := p.pool.Get().(*Marshaller)
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bts, err := m.Marshal(obj)
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p.pool.Put(m)
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return bts, err
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}
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// Encode encodes the passed object to the given writer using the pool of
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// marshallers.
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func (p *PooledMarshaller) Encode(obj interface{}, w io.Writer) error {
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m := p.pool.Get().(*Marshaller)
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err := m.Encode(obj, w)
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p.pool.Put(m)
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return err
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}
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