/
client.go
77 lines (64 loc) · 2.06 KB
/
client.go
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package txsync
import (
"context"
"github.com/oasisprotocol/oasis-core/go/common"
"github.com/oasisprotocol/oasis-core/go/common/crypto/hash"
"github.com/oasisprotocol/oasis-core/go/worker/common/p2p/rpc"
)
// Client is a transaction sync protocol client.
type Client interface {
// GetTxs queries peers for transaction data.
GetTxs(ctx context.Context, request *GetTxsRequest) (*GetTxsResponse, error)
}
type client struct {
rc rpc.Client
}
func (c *client) GetTxs(ctx context.Context, request *GetTxsRequest) (*GetTxsResponse, error) {
// Make sure we don't request too many transactions.
if len(request.Txs) > MaxGetTxsCount {
request.Txs = request.Txs[:MaxGetTxsCount]
}
txHashMap := make(map[hash.Hash]struct{}, len(request.Txs))
for _, txHash := range request.Txs {
txHashMap[txHash] = struct{}{}
}
resultTxMap := make(map[hash.Hash][]byte)
var rsp GetTxsResponse
_, _, err := c.rc.CallMulti(ctx, MethodGetTxs, request, rsp, MaxGetTxsResponseTime, MaxGetTxsParallelRequests,
rpc.WithAggregateFn(func(rawRsp interface{}, pf rpc.PeerFeedback) bool {
rsp := rawRsp.(*GetTxsResponse)
// If we received more transactions than we requested, this is an error.
if len(rsp.Txs) > len(request.Txs) {
pf.RecordFailure()
return true
}
// If we received transactions that we didn't request, this is an error.
for _, tx := range rsp.Txs {
txHash := hash.NewFromBytes(tx)
if _, valid := txHashMap[txHash]; !valid {
pf.RecordFailure()
return true
}
resultTxMap[txHash] = tx
}
if len(rsp.Txs) > 0 {
pf.RecordSuccess()
}
// Check if we have everything and stop early.
return len(resultTxMap) != len(txHashMap)
}))
if err != nil {
return nil, err
}
rsp.Txs = make([][]byte, 0, len(resultTxMap))
for _, tx := range resultTxMap {
rsp.Txs = append(rsp.Txs, tx)
}
return &rsp, nil
}
// NewClient creates a new transaction sync protocol client.
func NewClient(p2p rpc.P2P, runtimeID common.Namespace) Client {
return &client{
rc: rpc.NewClient(p2p, runtimeID, TxSyncProtocolID, TxSyncProtocolVersion),
}
}