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42 lines
1.3 KiB
42 lines
1.3 KiB
package encoding
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import (
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"strings"
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)
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// Codec defines the interface Transport uses to encode and decode messages. Note
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// that implementations of this interface must be thread safe; a Codec's
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// methods can be called from concurrent goroutines.
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type Codec interface {
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// Marshal returns the wire format of v.
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Marshal(v interface{}) ([]byte, error)
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// Unmarshal parses the wire format into v.
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Unmarshal(data []byte, v interface{}) error
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// Name returns the name of the Codec implementation. The returned string
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// will be used as part of content type in transmission. The result must be
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// static; the result cannot change between calls.
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Name() string
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}
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var registeredCodecs = make(map[string]Codec)
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// RegisterCodec registers the provided Codec for use with all Transport clients and
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// servers.
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func RegisterCodec(codec Codec) {
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if codec == nil {
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panic("cannot register a nil Codec")
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}
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if codec.Name() == "" {
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panic("cannot register Codec with empty string result for Name()")
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}
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contentSubtype := strings.ToLower(codec.Name())
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registeredCodecs[contentSubtype] = codec
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}
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// GetCodec gets a registered Codec by content-subtype, or nil if no Codec is
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// registered for the content-subtype.
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//
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// The content-subtype is expected to be lowercase.
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func GetCodec(contentSubtype string) Codec {
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return registeredCodecs[contentSubtype]
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}
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