refactor(metadata): use cbor-gen encoding (#96)

Use cbor-gen encoding for speed bump on metadata

go.mod

@@ -6,10 +6,11 @@ require (
 	github.com/gogo/protobuf v1.3.1
 	github.com/golang/protobuf v1.3.2 // indirect
 	github.com/gopherjs/gopherjs v0.0.0-20190812055157-5d271430af9f // indirect
+	github.com/hannahhoward/cbor-gen-for v0.0.0-20200817222906-ea96cece81f1
 	github.com/hannahhoward/go-pubsub v0.0.0-20200423002714-8d62886cc36e
 	github.com/ipfs/go-block-format v0.0.2
 	github.com/ipfs/go-blockservice v0.1.3
-	github.com/ipfs/go-cid v0.0.5
+	github.com/ipfs/go-cid v0.0.6
 	github.com/ipfs/go-datastore v0.4.4
 	github.com/ipfs/go-ipfs-blockstore v0.1.4
 	github.com/ipfs/go-ipfs-blocksutil v0.0.1
@@ -40,7 +41,8 @@ require (
 	github.com/smartystreets/assertions v1.0.1 // indirect
 	github.com/smartystreets/goconvey v0.0.0-20190731233626-505e41936337 // indirect
 	github.com/stretchr/testify v1.5.1
-	github.com/whyrusleeping/cbor-gen v0.0.0-20200402171437-3d27c146c105 // indirect
+	github.com/whyrusleeping/cbor-gen v0.0.0-20200710004633-5379fc63235d
 	go.uber.org/multierr v1.4.0 // indirect
 	golang.org/x/tools v0.0.0-20200827010519-17fd2f27a9e3 // indirect
+	golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543
 )

go.sum

@@ -32,7 +32,10 @@ github.com/coreos/go-semver v0.2.0 h1:3Jm3tLmsgAYcjC+4Up7hJrFBPr+n7rAqYeSw/SZazu
 github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/coreos/go-semver v0.3.0 h1:wkHLiw0WNATZnSG7epLsujiMCgPAc9xhjJ4tgnAxmfM=
 github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+github.com/cpuguy83/go-md2man v1.0.10 h1:BSKMNlYxDvnunlTymqtgONjNnaRV1sTpcovwwjF22jk=
 github.com/cpuguy83/go-md2man v1.0.10/go.mod h1:SmD6nW6nTyfqj6ABTjUi3V3JVMnlJmwcJI5acqYI6dE=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/crackcomm/go-gitignore v0.0.0-20170627025303-887ab5e44cc3 h1:HVTnpeuvF6Owjd5mniCL8DEXo7uYXdQEmOP4FJbV5tg=
 github.com/crackcomm/go-gitignore v0.0.0-20170627025303-887ab5e44cc3/go.mod h1:p1d6YEZWvFzEh4KLyvBcVSnrfNDDvK2zfK/4x2v/4pE=
 github.com/cskr/pubsub v1.0.2 h1:vlOzMhl6PFn60gRlTQQsIfVwaPB/B/8MziK8FhEPt/0=
@@ -94,6 +97,8 @@ github.com/gxed/hashland/keccakpg v0.0.1 h1:wrk3uMNaMxbXiHibbPO4S0ymqJMm41WiudyF
 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/hannahhoward/cbor-gen-for v0.0.0-20200817222906-ea96cece81f1 h1:F9k+7wv5OIk1zcq23QpdiL0hfDuXPjuOmMNaC6fgQ0Q=
+github.com/hannahhoward/cbor-gen-for v0.0.0-20200817222906-ea96cece81f1/go.mod h1:jvfsLIxk0fY/2BKSQ1xf2406AKA5dwMmKKv0ADcOfN8=
 github.com/hannahhoward/go-pubsub v0.0.0-20200423002714-8d62886cc36e h1:3YKHER4nmd7b5qy5t0GWDTwSn4OyRgfAXSmo6VnryBY=
 github.com/hannahhoward/go-pubsub v0.0.0-20200423002714-8d62886cc36e/go.mod h1:I8h3MITA53gN9OnWGCgaMa0JWVRdXthWw4M3CPM54OY=
 github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
@@ -133,6 +138,8 @@ github.com/ipfs/go-cid v0.0.3/go.mod h1:GHWU/WuQdMPmIosc4Yn1bcCT7dSeX4lBafM7iqUP
 github.com/ipfs/go-cid v0.0.4/go.mod h1:4LLaPOQwmk5z9LBgQnpkivrx8BJjUyGwTXCd5Xfj6+M=
 github.com/ipfs/go-cid v0.0.5 h1:o0Ix8e/ql7Zb5UVUJEUfjsWCIY8t48++9lR8qi6oiJU=
 github.com/ipfs/go-cid v0.0.5/go.mod h1:plgt+Y5MnOey4vO4UlUazGqdbEXuFYitED67FexhXog=
+github.com/ipfs/go-cid v0.0.6 h1:go0y+GcDOGeJIV01FeBsta4FHngoA4Wz7KMeLkXAhMs=
+github.com/ipfs/go-cid v0.0.6/go.mod h1:6Ux9z5e+HpkQdckYoX1PG/6xqKspzlEIR5SDmgqgC/I=
 github.com/ipfs/go-datastore v0.0.1 h1:AW/KZCScnBWlSb5JbnEnLKFWXL224LBEh/9KXXOrUms=
 github.com/ipfs/go-datastore v0.0.1/go.mod h1:d4KVXhMt913cLBEI/PXAy6ko+W7e9AhyAKBGh803qeE=
 github.com/ipfs/go-datastore v0.0.5 h1:q3OfiOZV5rlsK1H5V8benjeUApRfMGs4Mrhmr6NriQo=
@@ -443,6 +450,8 @@ github.com/mr-tron/base58 v1.1.3 h1:v+sk57XuaCKGXpWtVBX8YJzO7hMGx4Aajh4TQbdEFdc=
 github.com/mr-tron/base58 v1.1.3/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-base36 v0.1.0 h1:JR6TyF7JjGd3m6FbLU2cOxhC0Li8z8dLNGQ89tUg4F4=
+github.com/multiformats/go-base36 v0.1.0/go.mod h1:kFGE83c6s80PklsHO9sRn2NCoffoRdUUOENyW/Vv6sM=
 github.com/multiformats/go-multiaddr v0.0.1 h1:/QUV3VBMDI6pi6xfiw7lr6xhDWWvQKn9udPn68kLSdY=
 github.com/multiformats/go-multiaddr v0.0.1/go.mod h1:xKVEak1K9cS1VdmPZW3LSIb6lgmoS58qz/pzqmAxV44=
 github.com/multiformats/go-multiaddr v0.0.2/go.mod h1:xKVEak1K9cS1VdmPZW3LSIb6lgmoS58qz/pzqmAxV44=
@@ -471,6 +480,8 @@ github.com/multiformats/go-multiaddr-net v0.1.2 h1:P7zcBH9FRETdPkDrylcXVjQLQ2t1J
 github.com/multiformats/go-multiaddr-net v0.1.2/go.mod h1:QsWt3XK/3hwvNxZJp92iMQKME1qHfpYmyIjFVsSOY6Y=
 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-multibase v0.0.3 h1:l/B6bJDQjvQ5G52jw4QGSYeOTZoAwIO77RblWplfIqk=
+github.com/multiformats/go-multibase v0.0.3/go.mod h1:5+1R4eQrT3PkYZ24C3W2Ue2tPwIdYQD509ZjSb5y9Oc=
 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/multiformats/go-multihash v0.0.5 h1:1wxmCvTXAifAepIMyF39vZinRw5sbqjPs/UIi93+uik=
@@ -518,7 +529,12 @@ github.com/polydawn/refmt v0.0.0-20190807091052-3d65705ee9f1/go.mod h1:uIp+gprXx
 github.com/polydawn/refmt v0.0.0-20190809202753-05966cbd336a h1:hjZfReYVLbqFkAtr2us7vdy04YWz3LVAirzP7reh8+M=
 github.com/polydawn/refmt v0.0.0-20190809202753-05966cbd336a/go.mod h1:uIp+gprXxxrWSjjklXD+mN4wed/tMfjMMmN/9+JsA9o=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
+github.com/russross/blackfriday v1.5.2 h1:HyvC0ARfnZBqnXwABFeSZHpKvJHJJfPz81GNueLj0oo=
 github.com/russross/blackfriday v1.5.2/go.mod h1:JO/DiYxRf+HjHt06OyowR9PTA263kcR/rfWxYHBV53g=
+github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
+github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
+github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
 github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d h1:zE9ykElWQ6/NYmHa3jpm/yHnI4xSofP+UP6SpjHcSeM=
 github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d/go.mod h1:OnSkiWE9lh6wB0YB77sQom3nweQdgAjqCqsofrRNTgc=
@@ -556,14 +572,16 @@ github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/syndtr/goleveldb v1.0.0/go.mod h1:ZVVdQEZoIme9iO1Ch2Jdy24qqXrMMOU6lpPAyBWyWuQ=
 github.com/ugorji/go/codec v0.0.0-20181204163529-d75b2dcb6bc8/go.mod h1:VFNgLljTbGfSG7qAOspJ7OScBnGdDN/yBr0sguwnwf0=
+github.com/urfave/cli/v2 v2.0.0 h1:+HU9SCbu8GnEUFtIBfuUNXN39ofWViIEJIp6SURMpCg=
+github.com/urfave/cli/v2 v2.0.0/go.mod h1:SE9GqnLQmjVa0iPEY0f1w3ygNIYcIJ0OKPMoW2caLfQ=
 github.com/warpfork/go-wish v0.0.0-20180510122957-5ad1f5abf436/go.mod h1:x6AKhvSSexNrVSrViXSHUEbICjmGXhtgABaHIySUSGw=
 github.com/warpfork/go-wish v0.0.0-20190328234359-8b3e70f8e830 h1:8kxMKmKzXXL4Ru1nyhvdms/JjWt+3YLpvRb/bAjO/y0=
 github.com/warpfork/go-wish v0.0.0-20190328234359-8b3e70f8e830/go.mod h1:x6AKhvSSexNrVSrViXSHUEbICjmGXhtgABaHIySUSGw=
 github.com/warpfork/go-wish v0.0.0-20200122115046-b9ea61034e4a h1:G++j5e0OC488te356JvdhaM8YS6nMsjLAYF7JxCv07w=
 github.com/warpfork/go-wish v0.0.0-20200122115046-b9ea61034e4a/go.mod h1:x6AKhvSSexNrVSrViXSHUEbICjmGXhtgABaHIySUSGw=
 github.com/whyrusleeping/cbor-gen v0.0.0-20200123233031-1cdf64d27158/go.mod h1:Xj/M2wWU+QdTdRbu/L/1dIZY8/Wb2K9pAhtroQuxJJI=
-github.com/whyrusleeping/cbor-gen v0.0.0-20200402171437-3d27c146c105 h1:Sh6UG5dW5xW8Ek2CtRGq4ipdEvvx9hOyBJjEGyTYDl0=
-github.com/whyrusleeping/cbor-gen v0.0.0-20200402171437-3d27c146c105/go.mod h1:Xj/M2wWU+QdTdRbu/L/1dIZY8/Wb2K9pAhtroQuxJJI=
+github.com/whyrusleeping/cbor-gen v0.0.0-20200710004633-5379fc63235d h1:wSxKhvbN7kUoP0sfRS+w2tWr45qlU8409i94hHLOT8w=
+github.com/whyrusleeping/cbor-gen v0.0.0-20200710004633-5379fc63235d/go.mod h1:fgkXqYy7bV2cFeIEOkVTZS/WjXARfBqSH6Q2qHL33hQ=
 github.com/whyrusleeping/chunker v0.0.0-20181014151217-fe64bd25879f h1:jQa4QT2UP9WYv2nzyawpKMOCl+Z/jW7djv2/J50lj9E=
 github.com/whyrusleeping/chunker v0.0.0-20181014151217-fe64bd25879f/go.mod h1:p9UJB6dDgdPgMJZs7UjUOdulKyRr9fqkS+6JKAInPy8=
 github.com/whyrusleeping/go-keyspace v0.0.0-20160322163242-5b898ac5add1/go.mod h1:8UvriyWtv5Q5EOgjHaSseUEdkQfvwFv1I/In/O2M9gc=
@@ -628,6 +646,7 @@ golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHl
 golang.org/x/lint v0.0.0-20190930215403-16217165b5de h1:5hukYrvBGR8/eNkX5mdUezrA6JiaEZDtJb9Ei+1LlBs=
 golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
 golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc=
+golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
 golang.org/x/mod v0.3.0 h1:RM4zey1++hCTbCVQfnWeKs9/IEsaBLA8vTkd0WVtmH4=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -693,6 +712,7 @@ golang.org/x/tools v0.0.0-20190621195816-6e04913cbbac/go.mod h1:/rFqwRUd4F7ZHNgw
 golang.org/x/tools v0.0.0-20191029041327-9cc4af7d6b2c/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191029190741-b9c20aec41a5/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20191216173652-a0e659d51361/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
 golang.org/x/tools v0.0.0-20200827010519-17fd2f27a9e3 h1:r3P/5xOq/dK1991B65Oy6E1fRF/2d/fSYZJ/fXGVfJc=
 golang.org/x/tools v0.0.0-20200827010519-17fd2f27a9e3/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7 h1:9zdDQZ7Thm29KFXgAX/+yaf3eVbP7djjWp/dXAppNCc=

metadata/metadata.go

@@ -1,16 +1,19 @@
 package metadata
 
 import (
-	"github.com/ipld/go-ipld-prime"
-	"github.com/ipld/go-ipld-prime/fluent"
-	basicnode "github.com/ipld/go-ipld-prime/node/basic"
+	"bytes"
+	"fmt"
 
-	"github.com/ipfs/go-graphsync/ipldutil"
+	"github.com/ipfs/go-cid"
+	cbg "github.com/whyrusleeping/cbor-gen"
+	xerrors "golang.org/x/xerrors"
 )
 
+//go:generate cbor-gen-for --map-encoding Item
+
 // Item is a single link traversed in a repsonse
 type Item struct {
-	Link         ipld.Link
+	Link         cid.Cid
 	BlockPresent bool
 }
 
@@ -21,56 +24,56 @@ type Metadata []Item
 // DecodeMetadata assembles metadata from a raw byte array, first deserializing
 // as a node and then assembling into a metadata struct.
 func DecodeMetadata(data []byte) (Metadata, error) {
-	node, err := ipldutil.DecodeNode(data)
+	var metadata Metadata
+	r := bytes.NewReader(data)
+
+	br := cbg.GetPeeker(r)
+	scratch := make([]byte, 8)
+
+	maj, extra, err := cbg.CborReadHeaderBuf(br, scratch)
 	if err != nil {
 		return nil, err
 	}
-	iterator := node.ListIterator()
-	var metadata Metadata
-	if node.Length() != -1 {
-		metadata = make(Metadata, 0, node.Length())
+
+	if extra > cbg.MaxLength {
+		return nil, fmt.Errorf("t.Metadata: array too large (%d)", extra)
 	}
 
-	for !iterator.Done() {
-		_, item, err := iterator.Next()
-		if err != nil {
-			return nil, err
-		}
-		linkNode, err := item.LookupString("link")
-		if err != nil {
-			return nil, err
-		}
-		link, err := linkNode.AsLink()
-		if err != nil {
-			return nil, err
-		}
-		blockPresentNode, err := item.LookupString("blockPresent")
-		if err != nil {
-			return nil, err
-		}
-		blockPresent, err := blockPresentNode.AsBool()
-		if err != nil {
+	if maj != cbg.MajArray {
+		return nil, fmt.Errorf("expected cbor array")
+	}
+
+	if extra > 0 {
+		metadata = make(Metadata, extra)
+	}
+
+	for i := 0; i < int(extra); i++ {
+
+		var v Item
+		if err := v.UnmarshalCBOR(br); err != nil {
 			return nil, err
 		}
-		metadata = append(metadata, Item{link, blockPresent})
+
+		metadata[i] = v
 	}
-	return metadata, err
+
+	return metadata, nil
 }
 
 // EncodeMetadata encodes metadata to an IPLD node then serializes to raw bytes
 func EncodeMetadata(entries Metadata) ([]byte, error) {
-	node, err := fluent.Build(basicnode.Style.List, func(na fluent.NodeAssembler) {
-		na.CreateList(len(entries), func(na fluent.ListAssembler) {
-			for _, item := range entries {
-				na.AssembleValue().CreateMap(2, func(na fluent.MapAssembler) {
-					na.AssembleEntry("link").AssignLink(item.Link)
-					na.AssembleEntry("blockPresent").AssignBool(item.BlockPresent)
-				})
-			}
-		})
-	})
-	if err != nil {
+	w := new(bytes.Buffer)
+	scratch := make([]byte, 9)
+	if len(entries) > cbg.MaxLength {
+		return nil, xerrors.Errorf("Slice value was too long")
+	}
+	if err := cbg.WriteMajorTypeHeaderBuf(scratch, w, cbg.MajArray, uint64(len(entries))); err != nil {
 		return nil, err
 	}
-	return ipldutil.EncodeNode(node)
+	for _, v := range entries {
+		if err := v.MarshalCBOR(w); err != nil {
+			return nil, err
+		}
+	}
+	return w.Bytes(), nil
 }