ci: remove gx support

.travis.yml

@@ -10,7 +10,6 @@ env:
   global:
     - GOTFLAGS="-race"
   matrix:
-    - BUILD_DEPTYPE=gx
     - BUILD_DEPTYPE=gomod
 
 
@@ -24,7 +23,6 @@ script:
 
 cache:
   directories:
-    - $GOPATH/src/gx
     - $GOPATH/pkg/mod
     - $HOME/.cache/go-build
 

Makefile

@@ -1,16 +0,0 @@
-all: deps
-
-gx:
-	go get github.com/whyrusleeping/gx
-	go get github.com/whyrusleeping/gx-go
-
-covertools:
-	go get github.com/mattn/goveralls
-	go get golang.org/x/tools/cmd/cover
-
-deps: gx covertools
-	gx --verbose install --global
-	gx-go rewrite
-
-publish:
-	gx-go rewrite --undo

README.md

@@ -35,22 +35,6 @@ Note that `go-cid` is packaged with Gx, so it is recommended to use Gx to instal
 
 ## Usage
 
-### Using Gx and Gx-go
-
-This module is packaged with [Gx](https://github.com/whyrusleeping/gx). In order to use it in your own project it is recommended that you:
-
-```sh
-go get -u github.com/whyrusleeping/gx
-go get -u github.com/whyrusleeping/gx-go
-cd <your-project-repository>
-gx init
-gx import github.com/ipfs/go-cid
-gx install --global
-gx-go --rewrite
-```
-
-Please check [Gx](https://github.com/whyrusleeping/gx) and [Gx-go](https://github.com/whyrusleeping/gx-go) documentation for more information.
-
 ### Running tests
 
 Before running tests, please run:

cid.go

@@ -26,15 +26,20 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"io"
 	"strings"
 
 	mbase "github.com/multiformats/go-multibase"
 	mh "github.com/multiformats/go-multihash"
+
+	cbg "github.com/whyrusleeping/cbor-gen"
 )
 
 // UnsupportedVersionString just holds an error message
 const UnsupportedVersionString = "<unsupported cid version>"
 
+const CidMaxLen = 256
+
 var (
 	// ErrVarintBuffSmall means that a buffer passed to the cid parser was not
 	// long enough, or did not contain an invalid cid
@@ -49,6 +54,10 @@ var (
 	// enough to be a valid Cid
 	ErrCidTooShort = errors.New("cid too short")
 
+	// ErrCidTooLong means that the CIDs payload was greater than CidMaxLen
+	// bytes
+	ErrCidTooLong = errors.New("cid too long")
+
 	// ErrInvalidEncoding means that selected encoding is not supported
 	// by this Cid version
 	ErrInvalidEncoding = errors.New("invalid base encoding")
@@ -290,6 +299,10 @@ func uvError(read int) error {
 // Please use decode when parsing a regular Cid string, as Cast does not
 // expect multibase-encoded data. Cast accepts the output of Cid.Bytes().
 func Cast(data []byte) (Cid, error) {
+	if len(data) > CidMaxLen {
+		return Undef, ErrCidTooLong
+	}
+
 	if len(data) == 34 && data[0] == 18 && data[1] == 32 {
 		h, err := mh.Cast(data)
 		if err != nil {
@@ -522,6 +535,75 @@ func (c Cid) Prefix() Prefix {
 	}
 }
 
+func (c Cid) MarshalCBOR(w io.Writer) error {
+	tag := cbg.CborEncodeMajorType(cbg.MajTag, 42)
+	if _, err := w.Write(tag); err != nil {
+		return err
+	}
+
+	typ := cbg.CborEncodeMajorType(cbg.MajByteString, uint64(len(c.Bytes())+1))
+	if _, err := w.Write(typ); err != nil {
+		return err
+	}
+
+	// that binary multibase prefix...
+	if _, err := w.Write([]byte{0}); err != nil {
+		return err
+	}
+
+	if _, err := w.Write(c.Bytes()); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (c *Cid) UnmarshalCBOR(br cbg.ByteReader) error {
+	maj, extra, err := cbg.CborReadHeader(br)
+	if err != nil {
+		return err
+	}
+
+	if maj != cbg.MajTag || extra != 42 {
+		return fmt.Errorf("CBOR serialized CIDs must have the tag 42")
+	}
+
+	maj, extra, err = cbg.CborReadHeader(br)
+	if err != nil {
+		return err
+	}
+
+	if maj != 2 {
+		return fmt.Errorf("CBOR serialized CIDs must be tagged byte arrays")
+	}
+
+	if extra < 2 {
+		return fmt.Errorf("encoded CID body must be at least two bytes long")
+	}
+
+	if extra > CidMaxLen+1 {
+		return fmt.Errorf("CIDs cannot be longer than 256 bytes")
+	}
+
+	buf := make([]byte, extra)
+	if _, err := io.ReadFull(br, buf); err != nil {
+		return fmt.Errorf("failed to read CID body: %s", err)
+	}
+
+	if buf[0] != 0 {
+		return fmt.Errorf("encoded CID did not have binary multibase")
+	}
+
+	out, err := Cast(buf[1:])
+	if err != nil {
+		return err
+	}
+
+	*c = out
+
+	return nil
+}
+
 // Prefix represents all the metadata of a Cid,
 // that is, the Version, the Codec, the Multihash type
 // and the Multihash length. It does not contains

cid_test.go

@@ -2,6 +2,7 @@ package cid
 
 import (
 	"bytes"
+	"encoding/hex"
 	"encoding/json"
 	"fmt"
 	"math/rand"
@@ -499,6 +500,77 @@ func TestJsonRoundTrip(t *testing.T) {
 	}
 }
 
+func TestCBORSerialization(t *testing.T) {
+	cases := map[string]string{
+		"bafybeibpzhw63c3vh7vushzvfzvkc2nbhr6nm3ui2o7kj33cx3xoovnzp4": "d82a582500017012202fc9eded8b753feb491f352e6aa169a13c7cd66e88d3bea4ef62beeee755b97f",
+		"QmRZCTZPygAnfagZKzjy48b4LMmqPNpJnNBEg5LtCCzHCA":              "d82a58230012202fc9eded8b753feb491f352e6aa169a13c7cd66e88d3bea4ef62beeee755b97f",
+	}
+
+	for cs, encs := range cases {
+		c, err := Decode(cs)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		buf := new(bytes.Buffer)
+		if err := c.MarshalCBOR(buf); err != nil {
+			t.Fatal(err)
+		}
+
+		exp, err := hex.DecodeString(encs)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if !bytes.Equal(exp, buf.Bytes()) {
+			t.Fatalf("serialization incorrect: %x != %x", buf.Bytes(), exp)
+		}
+
+		var out Cid
+		if err := out.UnmarshalCBOR(bytes.NewReader(exp)); err != nil {
+			t.Fatalf("unmarshal case %s failed: %s", cs, err)
+		}
+
+		if out != c {
+			t.Fatal("unmarshal CBOR failed")
+		}
+	}
+}
+
+func BenchmarkCBORMarshal(b *testing.B) {
+	c, err := Decode("bafybeibpzhw63c3vh7vushzvfzvkc2nbhr6nm3ui2o7kj33cx3xoovnzp4")
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	b.ReportAllocs()
+
+	buf := new(bytes.Buffer)
+	for i := 0; i < b.N; i++ {
+		buf.Reset()
+		if err := c.MarshalCBOR(buf); err != nil {
+			b.Fatal(err)
+		}
+	}
+}
+
+func BenchmarkCBORUnmarshal(b *testing.B) {
+	enc, err := hex.DecodeString("d82a582500017012202fc9eded8b753feb491f352e6aa169a13c7cd66e88d3bea4ef62beeee755b97f")
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	b.ReportAllocs()
+
+	var c Cid
+	for i := 0; i < b.N; i++ {
+		br := bytes.NewReader(enc)
+		if err := c.UnmarshalCBOR(br); err != nil {
+			b.Fatal(err)
+		}
+	}
+}
+
 func BenchmarkStringV1(b *testing.B) {
 	data := []byte("this is some test content")
 	hash, _ := mh.Sum(data, mh.SHA2_256, -1)

go.mod

@@ -3,4 +3,5 @@ module github.com/ipfs/go-cid
 require (
 	github.com/multiformats/go-multibase v0.0.1
 	github.com/multiformats/go-multihash v0.0.1
+	github.com/whyrusleeping/cbor-gen v0.0.0-20190820011425-d5123893e85a
 )

go.sum

@@ -1,7 +1,16 @@
+github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
 github.com/gxed/hashland/keccakpg v0.0.1 h1:wrk3uMNaMxbXiHibbPO4S0ymqJMm41WiudyFSs7UnsU=
 github.com/gxed/hashland/keccakpg v0.0.1/go.mod h1:kRzw3HkwxFU1mpmPP8v1WyQzwdGfmKFJ6tItnhQ67kU=
 github.com/gxed/hashland/murmur3 v0.0.1 h1:SheiaIt0sda5K+8FLz952/1iWS9zrnKsEJaOJu4ZbSc=
 github.com/gxed/hashland/murmur3 v0.0.1/go.mod h1:KjXop02n4/ckmZSnY2+HKcLud/tcmvhST0bie/0lS48=
+github.com/ipfs/go-block-format v0.0.2/go.mod h1:AWR46JfpcObNfg3ok2JHDUfdiHRgWhJgCQF+KIgOPJY=
+github.com/ipfs/go-cid v0.0.1/go.mod h1:GHWU/WuQdMPmIosc4Yn1bcCT7dSeX4lBafM7iqUPQvM=
+github.com/ipfs/go-cid v0.0.2/go.mod h1:GHWU/WuQdMPmIosc4Yn1bcCT7dSeX4lBafM7iqUPQvM=
+github.com/ipfs/go-cid v0.0.3/go.mod h1:GHWU/WuQdMPmIosc4Yn1bcCT7dSeX4lBafM7iqUPQvM=
+github.com/ipfs/go-ipfs-util v0.0.1/go.mod h1:spsl5z8KUnrve+73pOhSVZND1SIxPW5RyBCNzQxlJBc=
+github.com/ipfs/go-ipld-cbor v0.0.3/go.mod h1:wTBtrQZA3SoFKMVkp6cn6HMRteIB1VsmHA0AQFOn7Nc=
+github.com/ipfs/go-ipld-format v0.0.1/go.mod h1:kyJtbkDALmFHv3QR6et67i35QzO3S0dCDnkOJhcZkms=
+github.com/jtolds/gls v4.2.1+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
 github.com/minio/blake2b-simd v0.0.0-20160723061019-3f5f724cb5b1 h1:lYpkrQH5ajf0OXOcUbGjvZxxijuBwbbmlSxLiuofa+g=
 github.com/minio/blake2b-simd v0.0.0-20160723061019-3f5f724cb5b1/go.mod h1:pD8RvIylQ358TN4wwqatJ8rNavkEINozVn9DtGI3dfQ=
 github.com/minio/sha256-simd v0.0.0-20190131020904-2d45a736cd16 h1:5W7KhL8HVF3XCFOweFD3BNESdnO8ewyYTFT2R+/b8FQ=
@@ -14,6 +23,16 @@ github.com/multiformats/go-multibase v0.0.1 h1:PN9/v21eLywrFWdFNsFKaU04kLJzuYzmr
 github.com/multiformats/go-multibase v0.0.1/go.mod h1:bja2MqRZ3ggyXtZSEDKpl0uO/gviWFaSteVbWT51qgs=
 github.com/multiformats/go-multihash v0.0.1 h1:HHwN1K12I+XllBCrqKnhX949Orn4oawPkegHMu2vDqQ=
 github.com/multiformats/go-multihash v0.0.1/go.mod h1:w/5tugSrLEbWqlcgJabL3oHFKTwfvkofsjW2Qa1ct4U=
+github.com/polydawn/refmt v0.0.0-20190221155625-df39d6c2d992/go.mod h1:uIp+gprXxxrWSjjklXD+mN4wed/tMfjMMmN/9+JsA9o=
+github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d/go.mod h1:OnSkiWE9lh6wB0YB77sQom3nweQdgAjqCqsofrRNTgc=
+github.com/smartystreets/goconvey v0.0.0-20190222223459-a17d461953aa/go.mod h1:2RVY1rIf+2J2o/IM9+vPq9RzmHDSseB7FoXiSNIUsoU=
+github.com/warpfork/go-wish v0.0.0-20180510122957-5ad1f5abf436/go.mod h1:x6AKhvSSexNrVSrViXSHUEbICjmGXhtgABaHIySUSGw=
+github.com/whyrusleeping/cbor-gen v0.0.0-20190818214716-81392149d1dd h1:Nj8P2Fg3mRVnBfkNnxZK+QhjwCxI3kLng2nfTTLIudk=
+github.com/whyrusleeping/cbor-gen v0.0.0-20190818214716-81392149d1dd/go.mod h1:ga0xb76iSIPvNNiuR+g3+c3Rnwy0oVuBGvqDwsEV6x4=
+github.com/whyrusleeping/cbor-gen v0.0.0-20190819235733-17c06ddc16cb h1:49o2mhJ/B2nsmSjV4fUsrFEoKGM9NLWQSnk+YrAKFLg=
+github.com/whyrusleeping/cbor-gen v0.0.0-20190819235733-17c06ddc16cb/go.mod h1:ga0xb76iSIPvNNiuR+g3+c3Rnwy0oVuBGvqDwsEV6x4=
+github.com/whyrusleeping/cbor-gen v0.0.0-20190820011425-d5123893e85a h1:MYglUpczqDD6LXsnSXk6NWzwf64fheAuA3eBjyYGD/8=
+github.com/whyrusleeping/cbor-gen v0.0.0-20190820011425-d5123893e85a/go.mod h1:38LwjsrZy8ga8AbyOueCsLUAtdc1BDj/I929R+LnJfI=
 golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67 h1:ng3VDlRp5/DHpSWl02R4rM9I+8M2rhmsuLwAMmkLQWE=
 golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/sys v0.0.0-20190219092855-153ac476189d h1:Z0Ahzd7HltpJtjAHHxX8QFP3j1yYgiuvjbjRzDj/KH0=

package.json

@@ -1,30 +0,0 @@
-{
-  "author": "whyrusleeping",
-  "bugs": {
-    "url": "https://github.com/ipfs/go-cid"
-  },
-  "gx": {
-    "dvcsimport": "github.com/ipfs/go-cid"
-  },
-  "gxDependencies": [
-    {
-      "author": "whyrusleeping",
-      "hash": "QmerPMzPk1mJVowm8KgmoknWa4yCYvvugMPsgWmDNUvDLW",
-      "name": "go-multihash",
-      "version": "1.0.9"
-    },
-    {
-      "author": "whyrusleeping",
-      "hash": "QmekxXDhCxCJRNuzmHreuaT3BsuJcsjcXWNrtV9C8DRHtd",
-      "name": "go-multibase",
-      "version": "0.3.0"
-    }
-  ],
-  "gxVersion": "0.8.0",
-  "language": "go",
-  "license": "MIT",
-  "name": "go-cid",
-  "releaseCmd": "git commit -a -m \"gx publish $VERSION\"",
-  "version": "0.9.3"
-}
-