ci: remove gx support

.travis.yml

@@ -23,7 +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

@@ -14,9 +14,6 @@ go-cid
 This is an implementation in Go of the [CID spec](https://github.com/ipld/cid).
 It is used in `go-ipfs` and related packages to refer to a typed hunk of data.
 
-## Lead Maintainer
-
-[Eric Myhre](https://github.com/warpfork)
 
 ## Table of Contents
 
@@ -34,16 +31,20 @@ It is used in `go-ipfs` and related packages to refer to a typed hunk of data.
 go get github.com/ipfs/go-cid
 ```
 
+Note that `go-cid` is packaged with Gx, so it is recommended to use Gx to install and use it (see Usage section).
+
 ## Usage
 
 ### Running tests
 
-Run tests with `go test` from the directory root
+Before running tests, please run:
 
 ```sh
-go test
+make deps
 ```
 
+This will make sure that dependencies are rewritten to known working versions.
+
 ### Examples
 
 #### Parsing string input from users

builder.go

@@ -38,7 +38,7 @@ func (p V0Builder) Sum(data []byte) (Cid, error) {
 	if err != nil {
 		return Undef, err
 	}
-	return Cid{string(hash)}, nil
+	return NewCidV0(hash), nil
 }
 
 func (p V0Builder) GetCodec() uint64 {

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")
@@ -137,39 +146,25 @@ var CodecToStr = map[uint64]string{
 	DashTx:             "dash-tx",
 }
 
-// tryNewCidV0 tries to convert a multihash into a CIDv0 CID and returns an
-// error on failure.
-func tryNewCidV0(mhash mh.Multihash) (Cid, error) {
-	// Need to make sure hash is valid for CidV0 otherwise we will
-	// incorrectly detect it as CidV1 in the Version() method
-	dec, err := mh.Decode(mhash)
-	if err != nil {
-		return Undef, err
-	}
-	if dec.Code != mh.SHA2_256 || dec.Length != 32 {
-		return Undef, fmt.Errorf("invalid hash for cidv0 %d-%d", dec.Code, dec.Length)
-	}
-	return Cid{string(mhash)}, nil
-}
-
 // NewCidV0 returns a Cid-wrapped multihash.
 // They exist to allow IPFS to work with Cids while keeping
 // compatibility with the plain-multihash format used used in IPFS.
 // NewCidV1 should be used preferentially.
-//
-// Panics if the multihash isn't sha2-256.
 func NewCidV0(mhash mh.Multihash) Cid {
-	c, err := tryNewCidV0(mhash)
+	// Need to make sure hash is valid for CidV0 otherwise we will
+	// incorrectly detect it as CidV1 in the Version() method
+	dec, err := mh.Decode(mhash)
 	if err != nil {
 		panic(err)
 	}
-	return c
+	if dec.Code != mh.SHA2_256 || dec.Length != 32 {
+		panic("invalid hash for cidv0")
+	}
+	return Cid{string(mhash)}
 }
 
 // NewCidV1 returns a new Cid using the given multicodec-packed
 // content type.
-//
-// Panics if the multihash is invalid.
 func NewCidV1(codecType uint64, mhash mh.Multihash) Cid {
 	hashlen := len(mhash)
 	// two 8 bytes (max) numbers plus hash
@@ -217,7 +212,7 @@ func Parse(v interface{}) (Cid, error) {
 	case []byte:
 		return Cast(v2)
 	case mh.Multihash:
-		return tryNewCidV0(v2)
+		return NewCidV0(v2), nil
 	case Cid:
 		return v2, nil
 	default:
@@ -248,7 +243,7 @@ func Decode(v string) (Cid, error) {
 			return Undef, err
 		}
 
-		return tryNewCidV0(hash)
+		return NewCidV0(hash), nil
 	}
 
 	_, data, err := mbase.Decode(v)
@@ -304,16 +299,40 @@ 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) {
-	nr, c, err := CidFromBytes(data)
+	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 {
+			return Undef, err
+		}
+
+		return NewCidV0(h), nil
+	}
+
+	vers, n := binary.Uvarint(data)
+	if err := uvError(n); err != nil {
+		return Undef, err
+	}
+
+	if vers != 1 {
+		return Undef, fmt.Errorf("expected 1 as the cid version number, got: %d", vers)
+	}
+
+	_, cn := binary.Uvarint(data[n:])
+	if err := uvError(cn); err != nil {
+		return Undef, err
+	}
+
+	rest := data[n+cn:]
+	h, err := mh.Cast(rest)
 	if err != nil {
 		return Undef, err
 	}
 
-	if nr != len(data) {
-		return Undef, fmt.Errorf("trailing bytes in data buffer passed to cid Cast")
-	}
-
-	return c, nil
+	return Cid{string(data[0 : n+cn+len(h)])}, nil
 }
 
 // UnmarshalBinary is equivalent to Cast(). It implements the
@@ -516,6 +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
@@ -537,12 +625,6 @@ func (p Prefix) Sum(data []byte) (Cid, error) {
 		length = -1
 	}
 
-	if p.Version == 0 && (p.MhType != mh.SHA2_256 ||
-		(p.MhLength != 32 && p.MhLength != -1)) {
-
-		return Undef, fmt.Errorf("invalid v0 prefix")
-	}
-
 	hash, err := mh.Sum(data, p.MhType, length)
 	if err != nil {
 		return Undef, err
@@ -601,41 +683,3 @@ func PrefixFromBytes(buf []byte) (Prefix, error) {
 		MhLength: int(mhlen),
 	}, nil
 }
-
-func CidFromBytes(data []byte) (int, Cid, error) {
-	if len(data) > 2 && data[0] == mh.SHA2_256 && data[1] == 32 {
-		if len(data) < 34 {
-			return 0, Undef, fmt.Errorf("not enough bytes for cid v0")
-		}
-
-		h, err := mh.Cast(data[:34])
-		if err != nil {
-			return 0, Undef, err
-		}
-
-		return 34, Cid{string(h)}, nil
-	}
-
-	vers, n := binary.Uvarint(data)
-	if err := uvError(n); err != nil {
-		return 0, Undef, err
-	}
-
-	if vers != 1 {
-		return 0, Undef, fmt.Errorf("expected 1 as the cid version number, got: %d", vers)
-	}
-
-	_, cn := binary.Uvarint(data[n:])
-	if err := uvError(cn); err != nil {
-		return 0, Undef, err
-	}
-
-	mhnr, _, err := mh.MHFromBytes(data[n+cn:])
-	if err != nil {
-		return 0, Undef, err
-	}
-
-	l := n + cn + mhnr
-
-	return l, Cid{string(data[0:l])}, nil
-}

cid_test.go

@@ -2,6 +2,7 @@ package cid
 
 import (
 	"bytes"
+	"encoding/hex"
 	"encoding/json"
 	"fmt"
 	"math/rand"
@@ -333,41 +334,6 @@ func TestNewPrefixV0(t *testing.T) {
 	if c1.Prefix() != c2.Prefix() {
 		t.Fatal("prefixes mismatch")
 	}
-
-}
-
-func TestInvalidV0Prefix(t *testing.T) {
-	tests := []Prefix{
-		{
-			MhType:   mh.SHA2_256,
-			MhLength: 31,
-		},
-		{
-			MhType:   mh.SHA2_256,
-			MhLength: 33,
-		},
-		{
-			MhType:   mh.SHA2_256,
-			MhLength: -2,
-		},
-		{
-			MhType:   mh.SHA2_512,
-			MhLength: 32,
-		},
-		{
-			MhType:   mh.SHA2_512,
-			MhLength: -1,
-		},
-	}
-
-	for i, p := range tests {
-		t.Log(i)
-		_, err := p.Sum([]byte("testdata"))
-		if err == nil {
-			t.Fatalf("should error (index %d)", i)
-		}
-	}
-
 }
 
 func TestPrefixRoundtrip(t *testing.T) {
@@ -534,6 +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)
@@ -550,48 +587,3 @@ func BenchmarkStringV1(b *testing.B) {
 		b.FailNow()
 	}
 }
-
-func TestReadCidsFromBuffer(t *testing.T) {
-	cidstr := []string{
-		"bafkreie5qrjvaw64n4tjm6hbnm7fnqvcssfed4whsjqxzslbd3jwhsk3mm",
-		"Qmf5Qzp6nGBku7CEn2UQx4mgN8TW69YUok36DrGa6NN893",
-		"zb2rhZi1JR4eNc2jBGaRYJKYM8JEB4ovenym8L1CmFsRAytkz",
-	}
-
-	var cids []Cid
-	var buf []byte
-	for _, cs := range cidstr {
-		c, err := Decode(cs)
-		if err != nil {
-			t.Fatal(err)
-		}
-		cids = append(cids, c)
-		buf = append(buf, c.Bytes()...)
-	}
-
-	var cur int
-	for _, expc := range cids {
-		n, c, err := CidFromBytes(buf[cur:])
-		if err != nil {
-			t.Fatal(err)
-		}
-		if c != expc {
-			t.Fatal("cids mismatched")
-		}
-		cur += n
-	}
-	if cur != len(buf) {
-		t.Fatal("had trailing bytes")
-	}
-}
-
-func TestBadParse(t *testing.T) {
-	hash, err := mh.Sum([]byte("foobar"), mh.SHA3_256, -1)
-	if err != nil {
-		t.Fatal(err)
-	}
-	_, err = Parse(hash)
-	if err == nil {
-		t.Fatal("expected to fail to parse an invalid CIDv1 CID")
-	}
-}

go.mod

@@ -2,7 +2,6 @@ module github.com/ipfs/go-cid
 
 require (
 	github.com/multiformats/go-multibase v0.0.1
-	github.com/multiformats/go-multihash v0.0.10
+	github.com/multiformats/go-multihash v0.0.1
+	github.com/whyrusleeping/cbor-gen v0.0.0-20190820011425-d5123893e85a
 )
-
-go 1.13

go.sum

@@ -1,28 +1,39 @@
+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 v0.1.1-0.20190913151208-6de447530771 h1:MHkK1uRtFbVqvAgvWxafZe54+5uBxLluGylDiKgdhwo=
-github.com/minio/sha256-simd v0.1.1-0.20190913151208-6de447530771/go.mod h1:B5e1o+1/KgNmWrSQK08Y6Z1Vb5pwIktudl0J58iy0KM=
+github.com/minio/sha256-simd v0.0.0-20190131020904-2d45a736cd16 h1:5W7KhL8HVF3XCFOweFD3BNESdnO8ewyYTFT2R+/b8FQ=
+github.com/minio/sha256-simd v0.0.0-20190131020904-2d45a736cd16/go.mod h1:2FMWW+8GMoPweT6+pI63m9YE3Lmw4J71hV56Chs1E/U=
 github.com/mr-tron/base58 v1.1.0 h1:Y51FGVJ91WBqCEabAi5OPUz38eAx8DakuAm5svLcsfQ=
 github.com/mr-tron/base58 v1.1.0/go.mod h1:xcD2VGqlgYjBdcBLw+TuYLr8afG+Hj8g2eTVqeSzSU8=
-github.com/mr-tron/base58 v1.1.2 h1:ZEw4I2EgPKDJ2iEw0cNmLB3ROrEmkOtXIkaG7wZg+78=
-github.com/mr-tron/base58 v1.1.2/go.mod h1:BinMc/sQntlIE1frQmRFPUoPA1Zkr8VRgBdjWI2mNwc=
 github.com/multiformats/go-base32 v0.0.3 h1:tw5+NhuwaOjJCC5Pp82QuXbrmLzWg7uxlMFp8Nq/kkI=
 github.com/multiformats/go-base32 v0.0.3/go.mod h1:pLiuGC8y0QR3Ue4Zug5UzK9LjgbkL8NSQj0zQ5Nz/AA=
 github.com/multiformats/go-multibase v0.0.1 h1:PN9/v21eLywrFWdFNsFKaU04kLJzuYzmrJR+ubhT9qA=
 github.com/multiformats/go-multibase v0.0.1/go.mod h1:bja2MqRZ3ggyXtZSEDKpl0uO/gviWFaSteVbWT51qgs=
-github.com/multiformats/go-multihash v0.0.8 h1:wrYcW5yxSi3dU07n5jnuS5PrNwyHy0zRHGVoUugWvXg=
-github.com/multiformats/go-multihash v0.0.8/go.mod h1:YSLudS+Pi8NHE7o6tb3D8vrpKa63epEDmG8nTduyAew=
-github.com/multiformats/go-multihash v0.0.9 h1:aoijQXYYl7Xtb2pUUP68R+ys1TlnlR3eX6wmozr0Hp4=
-github.com/multiformats/go-multihash v0.0.9/go.mod h1:YSLudS+Pi8NHE7o6tb3D8vrpKa63epEDmG8nTduyAew=
-github.com/multiformats/go-multihash v0.0.10 h1:lMoNbh2Ssd9PUF74Nz008KGzGPlfeV6wH3rit5IIGCM=
-github.com/multiformats/go-multihash v0.0.10/go.mod h1:YSLudS+Pi8NHE7o6tb3D8vrpKa63epEDmG8nTduyAew=
-github.com/spaolacci/murmur3 v1.1.0 h1:7c1g84S4BPRrfL5Xrdp6fOJ206sU9y293DDHaoy0bLI=
-github.com/spaolacci/murmur3 v1.1.0/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
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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"
-}
-