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server.go
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server.go
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package server
import (
"context"
"github.com/pingcap-incubator/tinykv/kv/coprocessor"
"github.com/pingcap-incubator/tinykv/kv/storage"
"github.com/pingcap-incubator/tinykv/kv/storage/raft_storage"
"github.com/pingcap-incubator/tinykv/kv/transaction/latches"
"github.com/pingcap-incubator/tinykv/kv/transaction/mvcc"
"github.com/pingcap-incubator/tinykv/kv/util/engine_util"
coppb "github.com/pingcap-incubator/tinykv/proto/pkg/coprocessor"
"github.com/pingcap-incubator/tinykv/proto/pkg/kvrpcpb"
"github.com/pingcap-incubator/tinykv/proto/pkg/tinykvpb"
"github.com/pingcap/tidb/kv"
)
var _ tinykvpb.TinyKvServer = new(Server)
// Server is a TinyKV server, it 'faces outwards', sending and receiving messages from clients such as TinySQL.
type Server struct {
storage storage.Storage
// (Used in 4A/4B)
Latches *latches.Latches
// coprocessor API handler, out of course scope
copHandler *coprocessor.CopHandler
}
func NewServer(storage storage.Storage) *Server {
return &Server{
storage: storage,
Latches: latches.NewLatches(),
}
}
// The below functions are Server's gRPC API (implements TinyKvServer).
// Raft commands (tinykv <-> tinykv)
// Only used for RaftStorage, so trivially forward it.
func (server *Server) Raft(stream tinykvpb.TinyKv_RaftServer) error {
return server.storage.(*raft_storage.RaftStorage).Raft(stream)
}
// Snapshot stream (tinykv <-> tinykv)
// Only used for RaftStorage, so trivially forward it.
func (server *Server) Snapshot(stream tinykvpb.TinyKv_SnapshotServer) error {
return server.storage.(*raft_storage.RaftStorage).Snapshot(stream)
}
// Transactional API.
func (server *Server) KvGet(_ context.Context, req *kvrpcpb.GetRequest) (*kvrpcpb.GetResponse, error) {
// Your Code Here (4B).
resp := &kvrpcpb.GetResponse{
RegionError: nil,
Error: nil,
Value: nil,
NotFound: false,
}
reader, err := server.storage.Reader(req.Context)
defer reader.Close()
if err != nil {
return nil, err
}
txn := mvcc.NewMvccTxn(reader, req.Version)
lock, err := txn.GetLock(req.Key)
if err != nil {
return nil, err
}
if lock != nil && lock.IsLockedFor(req.Key, txn.StartTS, resp) { // 会帮我们设置 resp 的
return resp, nil
}
val, err := txn.GetValue(req.Key)
if err != nil {
return nil, err
}
resp.NotFound = val == nil
resp.Value = val
return resp, nil
}
func (server *Server) KvPrewrite(_ context.Context, req *kvrpcpb.PrewriteRequest) (*kvrpcpb.PrewriteResponse, error) {
// Your Code Here (4B).
resp := &kvrpcpb.PrewriteResponse{
RegionError: nil,
Errors: nil,
}
reader, err := server.storage.Reader(req.Context)
defer reader.Close()
if err != nil {
return nil, err
}
txn := mvcc.NewMvccTxn(reader, req.StartVersion)
var errors []*kvrpcpb.KeyError
for _, v := range req.Mutations {
// write conflict
_, commitTs, err := txn.MostRecentWrite(v.Key)
if err != nil {
return nil, err
}
if commitTs >= txn.StartTS {
errors = append(errors, &kvrpcpb.KeyError{
Conflict: &kvrpcpb.WriteConflict{
StartTs: txn.StartTS,
ConflictTs: commitTs,
Key: v.Key,
Primary: req.PrimaryLock,
},
})
continue
}
// locked, not me
lock, err := txn.GetLock(v.Key)
if err != nil {
return nil, err
}
if lock != nil && lock.Ts != txn.StartTS {
errors = append(errors, &kvrpcpb.KeyError{
Locked: &kvrpcpb.LockInfo{
PrimaryLock: req.PrimaryLock,
LockVersion: lock.Ts,
Key: v.Key,
LockTtl: lock.Ttl,
},
})
continue
}
// write CFDefault
var kind mvcc.WriteKind
switch v.Op {
case kvrpcpb.Op_Put:
kind = mvcc.WriteKindPut
txn.PutValue(v.Key, v.Value)
case kvrpcpb.Op_Del:
kind = mvcc.WriteKindDelete
txn.DeleteValue(v.Key)
}
// write CfLock
txn.PutLock(v.Key, &mvcc.Lock{
Primary: req.PrimaryLock,
Ts: txn.StartTS,
Ttl: req.LockTtl,
Kind: kind,
})
}
if len(errors) > 0 {
resp.Errors = errors
}
err = server.storage.Write(req.Context, txn.Writes())
if err != nil {
return nil, err
}
return resp, nil
}
func (server *Server) KvCommit(_ context.Context, req *kvrpcpb.CommitRequest) (*kvrpcpb.CommitResponse, error) {
// Your Code Here (4B).
resp := &kvrpcpb.CommitResponse{
RegionError: nil,
Error: nil,
}
reader, err := server.storage.Reader(req.Context)
defer reader.Close()
if err != nil {
return nil, err
}
txn := mvcc.NewMvccTxn(reader, req.StartVersion)
server.Latches.WaitForLatches(req.Keys) // 当前要处理的 key 都锁上
defer server.Latches.ReleaseLatches(req.Keys)
for _, v := range req.Keys {
// not locked, or not my lock
lock, err := txn.GetLock(v)
if err != nil {
return nil, err
}
if lock == nil {
write, _, _ := txn.CurrentWrite(v)
if write != nil && write.Kind != mvcc.WriteKindRollback { // 已经提交的忽略,已经回滚的报错
continue
}
resp.Error = &kvrpcpb.KeyError{Retryable: "false"}
return resp, nil
} else if lock.Ts != txn.StartTS {
resp.Error = &kvrpcpb.KeyError{Retryable: "true"}
return resp, nil
}
txn.PutWrite(v, req.CommitVersion, &mvcc.Write{
StartTS: txn.StartTS,
Kind: lock.Kind,
})
txn.DeleteLock(v)
}
err = server.storage.Write(req.Context, txn.Writes())
if err != nil {
return nil, err
}
return resp, nil
}
func (server *Server) KvScan(_ context.Context, req *kvrpcpb.ScanRequest) (*kvrpcpb.ScanResponse, error) {
// Your Code Here (4C).
resp := &kvrpcpb.ScanResponse{
RegionError: nil,
Pairs: nil,
}
reader, err := server.storage.Reader(req.Context)
defer reader.Close()
if err != nil {
return nil, err
}
txn := mvcc.NewMvccTxn(reader, req.Version)
scanner := mvcc.NewScanner(req.StartKey, txn)
defer scanner.Close()
var pairs []*kvrpcpb.KvPair
for i := 0; uint32(i) < req.Limit; i++ {
key, value, err := scanner.Next()
if key == nil && value == nil && err == nil {
break
}
if err != nil {
return nil, err
}
if value == nil {
continue
}
lock, err := txn.GetLock(key)
if err != nil {
return nil, err
}
newPair := &kvrpcpb.KvPair{
Error: nil,
Key: key,
Value: value,
}
if lock.IsLockedFor(key, txn.StartTS, newPair) { // it will set Error
pairs = append(pairs, newPair)
} else {
pairs = append(pairs, newPair)
}
}
resp.Pairs = pairs
return resp, nil
}
func (server *Server) KvCheckTxnStatus(_ context.Context, req *kvrpcpb.CheckTxnStatusRequest) (*kvrpcpb.CheckTxnStatusResponse, error) {
// Your Code Here (4C).
resp := &kvrpcpb.CheckTxnStatusResponse{
RegionError: nil,
LockTtl: 0,
CommitVersion: 0,
Action: 0,
}
reader, err := server.storage.Reader(req.Context)
defer reader.Close()
if err != nil {
return nil, err
}
txn := mvcc.NewMvccTxn(reader, req.LockTs)
lock, err := txn.GetLock(req.PrimaryKey)
if err != nil {
return nil, err
}
if lock == nil || lock.Ts != txn.StartTS {
write, commitTs, _ := txn.CurrentWrite(req.PrimaryKey)
if write != nil {
if write.Kind != mvcc.WriteKindRollback {
resp.CommitVersion = commitTs
}
} else {
txn.PutWrite(req.PrimaryKey, req.LockTs, &mvcc.Write{ // lockTs here... why?
StartTS: txn.StartTS,
Kind: mvcc.WriteKindRollback,
})
err = server.storage.Write(req.Context, txn.Writes())
if err != nil {
return nil, err
}
resp.Action = kvrpcpb.Action_LockNotExistRollback
return resp, nil
}
} else if mvcc.PhysicalTime(req.CurrentTs) >= lock.Ttl+mvcc.PhysicalTime(lock.Ts) {
txn.PutWrite(req.PrimaryKey, req.LockTs, &mvcc.Write{ // lockTs here... why?
StartTS: txn.StartTS,
Kind: mvcc.WriteKindRollback,
})
txn.DeleteLock(req.PrimaryKey)
txn.DeleteValue(req.PrimaryKey)
err = server.storage.Write(req.Context, txn.Writes())
if err != nil {
return nil, err
}
resp.Action = kvrpcpb.Action_TTLExpireRollback
return resp, nil
}
return resp, nil
}
func (server *Server) KvBatchRollback(_ context.Context, req *kvrpcpb.BatchRollbackRequest) (*kvrpcpb.BatchRollbackResponse, error) {
// Your Code Here (4C).
resp := &kvrpcpb.BatchRollbackResponse{
RegionError: nil,
Error: nil,
}
reader, err := server.storage.Reader(req.Context)
defer reader.Close()
if err != nil {
return nil, err
}
txn := mvcc.NewMvccTxn(reader, req.StartVersion)
server.Latches.WaitForLatches(req.Keys) // 当前要处理的 key 都锁上
defer server.Latches.ReleaseLatches(req.Keys)
for _, v := range req.Keys {
write, _, err := txn.CurrentWrite(v)
if err != nil {
return nil, err
}
if write != nil && write.Kind == mvcc.WriteKindRollback { // already rollback
continue
} else if write != nil {
resp.Error = &kvrpcpb.KeyError{Abort: "true"} // try to rollback committed entry
return resp, nil
}
txn.PutWrite(v, req.StartVersion, &mvcc.Write{
StartTS: txn.StartTS,
Kind: mvcc.WriteKindRollback,
})
lock, err := txn.GetLock(v)
if err != nil {
return nil, err
}
if lock != nil && lock.Ts == txn.StartTS {
txn.DeleteLock(v)
txn.DeleteValue(v) // note this
}
}
err = server.storage.Write(req.Context, txn.Writes())
if err != nil {
return nil, err
}
return resp, nil
}
func (server *Server) KvResolveLock(ctx context.Context, req *kvrpcpb.ResolveLockRequest) (*kvrpcpb.ResolveLockResponse, error) {
// Your Code Here (4C).
// Resolve lock will find all locks belonging to the transaction with the given start timestamp.
// If commit_version is 0, TinyKV will rollback all locks.
// If commit_version is greater than 0 it will commit those locks with the given commit timestamp.
// The client will make a resolve lock request for all secondary keys once it has successfully committed
// or rolled back the primary key.
resp := &kvrpcpb.ResolveLockResponse{
RegionError: nil,
Error: nil,
}
reader, err := server.storage.Reader(req.Context)
defer reader.Close()
if err != nil {
return nil, err
}
txn := mvcc.NewMvccTxn(reader, req.StartVersion)
it := txn.Reader.IterCF(engine_util.CfLock)
defer it.Close()
var lockKeys [][]byte
for ; it.Valid(); it.Next() {
val, err := it.Item().Value()
if err != nil {
return nil, err
}
lock, err := mvcc.ParseLock(val)
if err != nil {
return nil, err
}
if lock.Ts == txn.StartTS {
lockKeys = append(lockKeys, it.Item().Key())
}
}
if len(lockKeys) == 0 {
return resp, nil
}
if req.CommitVersion == 0 {
r, err := server.KvBatchRollback(ctx, &kvrpcpb.BatchRollbackRequest{
Context: req.Context,
StartVersion: req.StartVersion,
Keys: lockKeys,
})
if err != nil {
return nil, err
}
resp.RegionError = r.RegionError
resp.Error = r.Error
} else {
r, err := server.KvCommit(ctx, &kvrpcpb.CommitRequest{
Context: req.Context,
StartVersion: req.StartVersion,
Keys: lockKeys,
CommitVersion: req.CommitVersion,
})
if err != nil {
return nil, err
}
resp.RegionError = r.RegionError
resp.Error = r.Error
}
return resp, nil
}
// SQL push down commands.
func (server *Server) Coprocessor(_ context.Context, req *coppb.Request) (*coppb.Response, error) {
resp := new(coppb.Response)
reader, err := server.storage.Reader(req.Context)
if err != nil {
if regionErr, ok := err.(*raft_storage.RegionError); ok {
resp.RegionError = regionErr.RequestErr
return resp, nil
}
return nil, err
}
switch req.Tp {
case kv.ReqTypeDAG:
return server.copHandler.HandleCopDAGRequest(reader, req), nil
case kv.ReqTypeAnalyze:
return server.copHandler.HandleCopAnalyzeRequest(reader, req), nil
}
return nil, nil
}