High Performance, Feature-Rich Idiomatic Go codec/encoding library for binc, msgpack, cbor, json.
Supported Serialization formats are:
To install:
go get github.com/ugorji/go/codec
This package will carefully use ‘unsafe’ for performance reasons in specific places. You can build without unsafe use by passing the safe or appengine tag i.e. ‘go install -tags=safe ...’. Note that unsafe is only supported for the last 3 go sdk versions e.g. current go release is go 1.9, so we support unsafe use only from go 1.7+ . This is because supporting unsafe requires knowledge of implementation details.
Online documentation: http://godoc.org/github.com/ugorji/go/codec
Detailed Usage/How-to Primer: http://ugorji.net/blog/go-codec-primer
The idiomatic Go support is as seen in other encoding packages in the standard library (ie json, xml, gob, etc).
Rich Feature Set includes:
json: key in struct tag supported.Users can register a function to handle the encoding or decoding of their custom types.
There are no restrictions on what the custom type can be. Some examples:
type BisSet []int
type BitSet64 uint64
type UUID string
type MyStructWithUnexportedFields struct { a int; b bool; c []int; }
type GifImage struct { ... }
As an illustration, MyStructWithUnexportedFields would normally be encoded as an empty map because it has no exported fields, while UUID would be encoded as a string. However, with extension support, you can encode any of these however you like.
This package maintains symmetry in the encoding and decoding halfs. We determine how to encode or decode by walking this decision tree
This symmetry is important to reduce chances of issues happening because the encoding and decoding sides are out of sync e.g. decoded via very specific encoding.TextUnmarshaler but encoded via kind-specific generalized mode.
Consequently, if a type only defines one-half of the symmetry (e.g. it implements UnmarshalJSON() but not MarshalJSON() ), then that type doesn't satisfy the check and we will continue walking down the decision tree.
RPC Client and Server Codecs are implemented, so the codecs can be used with the standard net/rpc package.
Typical usage model:
// create and configure Handle
var (
bh codec.BincHandle
mh codec.MsgpackHandle
ch codec.CborHandle
)
mh.MapType = reflect.TypeOf(map[string]interface{}(nil))
// configure extensions
// e.g. for msgpack, define functions and enable Time support for tag 1
// mh.SetExt(reflect.TypeOf(time.Time{}), 1, myExt)
// create and use decoder/encoder
var (
r io.Reader
w io.Writer
b []byte
h = &bh // or mh to use msgpack
)
dec = codec.NewDecoder(r, h)
dec = codec.NewDecoderBytes(b, h)
err = dec.Decode(&v)
enc = codec.NewEncoder(w, h)
enc = codec.NewEncoderBytes(&b, h)
err = enc.Encode(v)
//RPC Server
go func() {
for {
conn, err := listener.Accept()
rpcCodec := codec.GoRpc.ServerCodec(conn, h)
//OR rpcCodec := codec.MsgpackSpecRpc.ServerCodec(conn, h)
rpc.ServeCodec(rpcCodec)
}
}()
//RPC Communication (client side)
conn, err = net.Dial("tcp", "localhost:5555")
rpcCodec := codec.GoRpc.ClientCodec(conn, h)
//OR rpcCodec := codec.MsgpackSpecRpc.ClientCodec(conn, h)
client := rpc.NewClientWithCodec(rpcCodec)
To run tests, use the following:
go test
To run the full suite of tests, use the following:
go test -tags alltests -run Suite
You can run the tag ‘safe’ to run tests or build in safe mode. e.g.
go test -tags safe -run Json go test -tags "alltests safe" -run Suite
Please see http://github.com/ugorji/go-codec-bench .
Struct fields matching the following are ignored during encoding and decoding
Every other field in a struct will be encoded/decoded.
Embedded fields are encoded as if they exist in the top-level struct, with some caveats. See Encode documentation.