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libp2p + HTTP an exploratory refactor #102

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libp2p + HTTP an exploratory refactor #102

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1caa0de
First draft
MarcoPolo Aug 4, 2023
0f02c80
Use non local go-libp2p version
MarcoPolo Aug 4, 2023
e431ed0
Remove streamHost parameter. Use option
MarcoPolo Aug 4, 2023
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20 changes: 20 additions & 0 deletions dagsync/httpsync/publisher.go
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Original file line number Diff line number Diff line change
Expand Up @@ -131,6 +131,26 @@ func NewPublisherWithoutServer(address string, handlerPath string, lsys ipld.Lin
}, nil
}

// NewPublisherHandler returns a Publisher for use as an http.Handler. Doesn't listen or know about a url prefix.
func NewPublisherHandler(lsys ipld.LinkSystem, privKey ic.PrivKey) (*Publisher, error) {
if privKey == nil {
return nil, errors.New("private key required to sign head requests")
}
peerID, err := peer.IDFromPrivateKey(privKey)
if err != nil {
return nil, fmt.Errorf("could not get peer id from private key: %w", err)
}

return &Publisher{
addr: nil,
closer: io.NopCloser(nil),
lsys: lsys,
handlerPath: "",
peerID: peerID,
privKey: privKey,
}, nil
}

// Addrs returns the addresses, as []multiaddress, that the Publisher is
// listening on.
func (p *Publisher) Addrs() []multiaddr.Multiaddr {
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130 changes: 130 additions & 0 deletions dagsync/httpsync/publisher_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -15,16 +15,23 @@ import (
"github.com/ipld/go-ipld-prime"
"github.com/ipld/go-ipld-prime/codec/dagjson"
"github.com/ipld/go-ipld-prime/datamodel"
"github.com/ipld/go-ipld-prime/fluent"
"github.com/ipld/go-ipld-prime/linking"
cidlink "github.com/ipld/go-ipld-prime/linking/cid"
"github.com/ipld/go-ipld-prime/node/basicnode"
"github.com/ipld/go-ipld-prime/storage/memstore"
"github.com/ipld/go-ipld-prime/traversal"
selectorparse "github.com/ipld/go-ipld-prime/traversal/selector/parse"
"github.com/ipni/go-libipni/announce"
"github.com/ipni/go-libipni/announce/message"
"github.com/ipni/go-libipni/dagsync/httpsync"
"github.com/libp2p/go-libp2p"
"github.com/libp2p/go-libp2p/core/crypto"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/libp2p/go-libp2p/core/protocol"
libp2phttp "github.com/libp2p/go-libp2p/p2p/http"
"github.com/multiformats/go-multiaddr"
"github.com/multiformats/go-multicodec"
"github.com/stretchr/testify/require"
)

Expand Down Expand Up @@ -96,6 +103,129 @@ func TestNewPublisherForListener(t *testing.T) {
}
}

func TestPublisherWithLibp2pHTTP(t *testing.T) {
ctx := context.Background()
req := require.New(t)

publisherStore := &correctedMemStore{&memstore.Store{
Bag: make(map[string][]byte),
}}
publisherLsys := cidlink.DefaultLinkSystem()
publisherLsys.TrustedStorage = true
publisherLsys.SetReadStorage(publisherStore)
publisherLsys.SetWriteStorage(publisherStore)

privKey, _, err := crypto.GenerateKeyPairWithReader(crypto.Ed25519, 256, rand.Reader)
req.NoError(err)

publisher, err := httpsync.NewPublisherHandler(publisherLsys, privKey)
req.NoError(err)

publisherStreamHost, err := libp2p.New(libp2p.ListenAddrStrings("/ip4/127.0.0.1/tcp/0"))
req.NoError(err)

publisherHost, err := libp2phttp.New(
libp2phttp.StreamHost(publisherStreamHost),
libp2phttp.ListenAddrs([]multiaddr.Multiaddr{multiaddr.StringCast("/ip4/127.0.0.1/tcp/0/http")}),
)
req.NoError(err)

go publisherHost.Serve()
defer publisherHost.Close()
Comment on lines +127 to +134
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This is the "HTTP Host". It's like the libp2p "stream host" (aka core host.Host), but it uses HTTP semantics instead of stream semantics.

You can pass in options on creation like a stream host to do HTTP over libp2p streams, and multiaddrs to create listeners on.


protoID := protocol.ID("/ipni-sync/1")

serverStreamMa := publisherHost.Addrs()[0]
serverHTTPMa := publisherHost.Addrs()[1]
req.Contains(serverHTTPMa.String(), "/http")

publisherHost.SetHttpHandlerAtPath(protoID, "/ipni/", http.StripPrefix("/ipni/", publisher))
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Here is where we attach our request handler. Note that we are mounting the "/ipni-sync/1" protocol at /ipni/. libp2phttp manages this mapping and clients can learn about the mapping at .well-known/libp2p.

In this case we also want out HTTP handler to not even know about the prefix, so we use the stdlib http.StripPrefix.


link, err := publisherLsys.Store(
ipld.LinkContext{Ctx: ctx},
cidlink.LinkPrototype{
Prefix: cid.Prefix{
Version: 1,
Codec: uint64(multicodec.DagJson),
MhType: uint64(multicodec.Sha2_256),
MhLength: -1,
},
},
fluent.MustBuildMap(basicnode.Prototype.Map, 4, func(na fluent.MapAssembler) {
na.AssembleEntry("fish").AssignString("lobster")
na.AssembleEntry("fish1").AssignString("lobster1")
na.AssembleEntry("fish2").AssignString("lobster2")
na.AssembleEntry("fish0").AssignString("lobster0")
}))
req.NoError(err)
publisher.SetRoot(link.(cidlink.Link).Cid)

testCases := []struct {
name string
newClient func(t *testing.T) *http.Client
}{
{"HTTP transport", func(t *testing.T) *http.Client {
clientHost, err := libp2phttp.New()
req.NoError(err)

c, err := clientHost.NamespacedClient(nil, protoID, peer.AddrInfo{Addrs: []multiaddr.Multiaddr{serverHTTPMa}})
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This creates an http.Client that automatically knows about the prefix for a given protocol ID.

req.NoError(err)
return &c
}},
{"libp2p stream transport", func(t *testing.T) *http.Client {
clientStreamHost, err := libp2p.New(libp2p.NoListenAddrs)
req.NoError(err)
clientHost, err := libp2phttp.New()
req.NoError(err)

c, err := clientHost.NamespacedClient(clientStreamHost, protoID, peer.AddrInfo{ID: publisherStreamHost.ID(), Addrs: []multiaddr.Multiaddr{serverStreamMa}})
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This is the same thing as above but it is going over a libp2p stream.

Note: I think I'll change the NamespacedClient api to not accept a stream host here, and instead use the one passed in as an option to libp2phttp.New.

req.NoError(err)

wk, err := clientHost.GetAndStorePeerProtoMap(c.Transport, publisherStreamHost.ID())
req.NoError(err)
// Assert we see the ipni protocol in the well known map
req.Contains(wk, protoID)

return &c
},
},
}

for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
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Nothing special here. Just plumbing to set up the test.

clientStore := &correctedMemStore{&memstore.Store{
Bag: make(map[string][]byte),
}}
clientLsys := cidlink.DefaultLinkSystem()
clientLsys.TrustedStorage = true
clientLsys.SetReadStorage(clientStore)
clientLsys.SetWriteStorage(clientStore)
clientSync := httpsync.NewSync(clientLsys, tc.newClient(t), nil)

clientSyncer, err := clientSync.NewSyncerWithoutAddrs(publisher.ID())
req.NoError(err)

headCid, err := clientSyncer.GetHead(ctx)
req.NoError(err)

req.Equal(link.(cidlink.Link).Cid, headCid)

clientSyncer.Sync(ctx, headCid, selectorparse.CommonSelector_MatchPoint)
require.NoError(t, err)

// Assert that data is loadable from the link system.
wantLink := cidlink.Link{Cid: headCid}
node, err := clientLsys.Load(ipld.LinkContext{Ctx: ctx}, wantLink, basicnode.Prototype.Any)
require.NoError(t, err)

// Assert synced node link matches the computed link, i.e. is spec-compliant.
gotLink, err := clientLsys.ComputeLink(wantLink.Prototype(), node)
require.NoError(t, err)
require.Equal(t, gotLink, wantLink, "computed %s but got %s", gotLink.String(), wantLink.String())
})
}
}

func mapKeys(t *testing.T, n ipld.Node) []string {
var keys []string
require.Equal(t, n.Kind(), datamodel.Kind_Map)
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9 changes: 9 additions & 0 deletions dagsync/httpsync/sync.go
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Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,15 @@ func (s *Sync) NewSyncer(peerID peer.ID, peerAddrs []multiaddr.Multiaddr) (*Sync
}, nil
}

func (s *Sync) NewSyncerWithoutAddrs(peerID peer.ID) (*Syncer, error) {
return &Syncer{
peerID: peerID,
rootURL: url.URL{Path: "/"},
urls: nil,
sync: s,
}, nil
}
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A Syncer instance is created for each sync operation and is responsible for making a request to a specific advertisement publisher. This means that each instance of aSyncer requires the addresses to connect to since these will not be known in advance.

I think instead of NewSyncerWithoutAddrs here, that NewSyncer should be modified to create a new clientHost.NamespacedClient if its parent Sync is using a libp2phttp client. The NamespacedClient can then be used as the http.Client in Syncer functions.

Will it be necessary to close each NamespacedClient instance and remove it from the clientHost and remove its peer info from the peerstore? Will that happen automatically after some time?

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I think instead of NewSyncerWithoutAddrs here, that NewSyncer should be modified to create a new clientHost.NamespacedClient if its parent Sync is using a libp2phttp client. The NamespacedClient can then be used as the http.Client in Syncer functions.

👍 . I thought about this change, but wanted to make a less invasive change to demo. I like it though.

Will it be necessary to close each NamespacedClient instance and remove it from the clientHost and remove its peer info from the peerstore? Will that happen automatically after some time?

Happens automatically :) (just like the stock http.Client does it)


func (s *Sync) Close() {
s.client.CloseIdleConnections()
}
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2 changes: 2 additions & 0 deletions go.mod
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Original file line number Diff line number Diff line change
Expand Up @@ -138,3 +138,5 @@ require (
gopkg.in/yaml.v3 v3.0.1 // indirect
lukechampine.com/blake3 v1.2.1 // indirect
)

replace github.com/libp2p/go-libp2p v0.29.0 => github.com/libp2p/go-libp2p v0.29.1-0.20230804013835-61da6d1db6a8
4 changes: 2 additions & 2 deletions go.sum
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Original file line number Diff line number Diff line change
Expand Up @@ -299,8 +299,8 @@ github.com/libp2p/go-cidranger v1.1.0 h1:ewPN8EZ0dd1LSnrtuwd4709PXVcITVeuwbag38y
github.com/libp2p/go-cidranger v1.1.0/go.mod h1:KWZTfSr+r9qEo9OkI9/SIEeAtw+NNoU0dXIXt15Okic=
github.com/libp2p/go-flow-metrics v0.1.0 h1:0iPhMI8PskQwzh57jB9WxIuIOQ0r+15PChFGkx3Q3WM=
github.com/libp2p/go-flow-metrics v0.1.0/go.mod h1:4Xi8MX8wj5aWNDAZttg6UPmc0ZrnFNsMtpsYUClFtro=
github.com/libp2p/go-libp2p v0.29.0 h1:QduJ2XQr/Crg4EnloueWDL0Jj86N3Ezhyyj7XH+XwHI=
github.com/libp2p/go-libp2p v0.29.0/go.mod h1:iNKL7mEnZ9wAss+03IjAwM9ZAQXfVUAPUUmOACQfQ/g=
github.com/libp2p/go-libp2p v0.29.1-0.20230804013835-61da6d1db6a8 h1:2jxDMRzd1Nba+hDLVzpdHEWnz46/23J0rB1l7PYKOGk=
github.com/libp2p/go-libp2p v0.29.1-0.20230804013835-61da6d1db6a8/go.mod h1:iNKL7mEnZ9wAss+03IjAwM9ZAQXfVUAPUUmOACQfQ/g=
github.com/libp2p/go-libp2p-asn-util v0.3.0 h1:gMDcMyYiZKkocGXDQ5nsUQyquC9+H+iLEQHwOCZ7s8s=
github.com/libp2p/go-libp2p-asn-util v0.3.0/go.mod h1:B1mcOrKUE35Xq/ASTmQ4tN3LNzVVaMNmq2NACuqyB9w=
github.com/libp2p/go-libp2p-gostream v0.6.0 h1:QfAiWeQRce6pqnYfmIVWJFXNdDyfiR/qkCnjyaZUPYU=
Expand Down