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package trillian
import (
"context"
"fmt"
"github.com/golang/glog"
"github.com/google/trillian"
ttypes "github.com/google/trillian/types"
"git.sigsum.org/sigsum-log-go/pkg/types"
"google.golang.org/grpc/codes"
)
type Client interface {
AddLeaf(context.Context, *types.LeafRequest) error
GetConsistencyProof(context.Context, *types.ConsistencyProofRequest) (*types.ConsistencyProof, error)
GetTreeHead(context.Context) (*types.TreeHead, error)
GetInclusionProof(context.Context, *types.InclusionProofRequest) (*types.InclusionProof, error)
GetLeaves(context.Context, *types.LeavesRequest) (*types.LeafList, error)
}
// TrillianClient is a wrapper around the Trillian gRPC client.
type TrillianClient struct {
// TreeID is a Merkle tree identifier that Trillian uses
TreeID int64
// GRPC is a Trillian gRPC client
GRPC trillian.TrillianLogClient
}
func (c *TrillianClient) AddLeaf(ctx context.Context, req *types.LeafRequest) error {
leaf := types.Leaf{
Message: req.Message,
SigIdent: types.SigIdent{
Signature: req.Signature,
KeyHash: types.Hash(req.VerificationKey[:]),
},
}
serialized := leaf.Marshal()
glog.V(3).Infof("queueing leaf request: %x", types.HashLeaf(serialized))
rsp, err := c.GRPC.QueueLeaf(ctx, &trillian.QueueLeafRequest{
LogId: c.TreeID,
Leaf: &trillian.LogLeaf{
LeafValue: serialized,
},
})
if err != nil {
return fmt.Errorf("backend failure: %v", err)
}
if rsp == nil {
return fmt.Errorf("no response")
}
if rsp.QueuedLeaf == nil {
return fmt.Errorf("no queued leaf")
}
if codes.Code(rsp.QueuedLeaf.GetStatus().GetCode()) == codes.AlreadyExists {
return fmt.Errorf("leaf is already queued or included")
}
return nil
}
func (c *TrillianClient) GetTreeHead(ctx context.Context) (*types.TreeHead, error) {
rsp, err := c.GRPC.GetLatestSignedLogRoot(ctx, &trillian.GetLatestSignedLogRootRequest{
LogId: c.TreeID,
})
if err != nil {
return nil, fmt.Errorf("backend failure: %v", err)
}
if rsp == nil {
return nil, fmt.Errorf("no response")
}
if rsp.SignedLogRoot == nil {
return nil, fmt.Errorf("no signed log root")
}
if rsp.SignedLogRoot.LogRoot == nil {
return nil, fmt.Errorf("no log root")
}
var r ttypes.LogRootV1
if err := r.UnmarshalBinary(rsp.SignedLogRoot.LogRoot); err != nil {
return nil, fmt.Errorf("no log root: unmarshal failed: %v", err)
}
if len(r.RootHash) != types.HashSize {
return nil, fmt.Errorf("unexpected hash length: %d", len(r.RootHash))
}
return treeHeadFromLogRoot(&r), nil
}
func (c *TrillianClient) GetConsistencyProof(ctx context.Context, req *types.ConsistencyProofRequest) (*types.ConsistencyProof, error) {
rsp, err := c.GRPC.GetConsistencyProof(ctx, &trillian.GetConsistencyProofRequest{
LogId: c.TreeID,
FirstTreeSize: int64(req.OldSize),
SecondTreeSize: int64(req.NewSize),
})
if err != nil {
return nil, fmt.Errorf("backend failure: %v", err)
}
if rsp == nil {
return nil, fmt.Errorf("no response")
}
if rsp.Proof == nil {
return nil, fmt.Errorf("no consistency proof")
}
if len(rsp.Proof.Hashes) == 0 {
return nil, fmt.Errorf("not a consistency proof: empty")
}
path, err := nodePathFromHashes(rsp.Proof.Hashes)
if err != nil {
return nil, fmt.Errorf("not a consistency proof: %v", err)
}
return &types.ConsistencyProof{
OldSize: req.OldSize,
NewSize: req.NewSize,
Path: path,
}, nil
}
func (c *TrillianClient) GetInclusionProof(ctx context.Context, req *types.InclusionProofRequest) (*types.InclusionProof, error) {
rsp, err := c.GRPC.GetInclusionProofByHash(ctx, &trillian.GetInclusionProofByHashRequest{
LogId: c.TreeID,
LeafHash: req.LeafHash[:],
TreeSize: int64(req.TreeSize),
OrderBySequence: true,
})
if err != nil {
return nil, fmt.Errorf("backend failure: %v", err)
}
if rsp == nil {
return nil, fmt.Errorf("no response")
}
if len(rsp.Proof) != 1 {
return nil, fmt.Errorf("bad proof count: %d", len(rsp.Proof))
}
proof := rsp.Proof[0]
if len(proof.Hashes) == 0 {
return nil, fmt.Errorf("not an inclusion proof: empty")
}
path, err := nodePathFromHashes(proof.Hashes)
if err != nil {
return nil, fmt.Errorf("not an inclusion proof: %v", err)
}
return &types.InclusionProof{
TreeSize: req.TreeSize,
LeafIndex: uint64(proof.LeafIndex),
Path: path,
}, nil
}
func (c *TrillianClient) GetLeaves(ctx context.Context, req *types.LeavesRequest) (*types.LeafList, error) {
rsp, err := c.GRPC.GetLeavesByRange(ctx, &trillian.GetLeavesByRangeRequest{
LogId: c.TreeID,
StartIndex: int64(req.StartSize),
Count: int64(req.EndSize-req.StartSize) + 1,
})
if err != nil {
return nil, fmt.Errorf("backend failure: %v", err)
}
if rsp == nil {
return nil, fmt.Errorf("no response")
}
if got, want := len(rsp.Leaves), int(req.EndSize-req.StartSize+1); got != want {
return nil, fmt.Errorf("unexpected number of leaves: %d", got)
}
var list types.LeafList
for i, leaf := range rsp.Leaves {
leafIndex := int64(req.StartSize + uint64(i))
if leafIndex != leaf.LeafIndex {
return nil, fmt.Errorf("unexpected leaf(%d): got index %d", leafIndex, leaf.LeafIndex)
}
var l types.Leaf
if err := l.Unmarshal(leaf.LeafValue); err != nil {
return nil, fmt.Errorf("unexpected leaf(%d): %v", leafIndex, err)
}
list = append(list[:], &l)
}
return &list, nil
}
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