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service.go
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service.go
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package cluster
import (
"encoding"
"encoding/binary"
"expvar"
"fmt"
"io"
"log"
"net"
"os"
"strings"
"sync"
"github.com/influxdata/influxdb"
"github.com/influxdata/influxdb/influxql"
"github.com/influxdata/influxdb/services/meta"
"github.com/influxdata/influxdb/tsdb"
)
// MaxMessageSize defines how large a message can be before we reject it
const MaxMessageSize = 1024 * 1024 * 1024 // 1GB
// MuxHeader is the header byte used in the TCP mux.
const MuxHeader = 2
// Statistics maintained by the cluster package
const (
writeShardReq = "writeShardReq"
writeShardPointsReq = "writeShardPointsReq"
writeShardFail = "writeShardFail"
createIteratorReq = "createIteratorReq"
createIteratorResp = "createIteratorResp"
fieldDimensionsReq = "fieldDimensionsReq"
fieldDimensionsResp = "fieldDimensionsResp"
seriesKeysReq = "seriesKeysReq"
seriesKeysResp = "seriesKeysResp"
)
// Service processes data received over raw TCP connections.
type Service struct {
mu sync.RWMutex
wg sync.WaitGroup
closing chan struct{}
Listener net.Listener
MetaClient interface {
ShardOwner(shardID uint64) (string, string, *meta.ShardGroupInfo)
}
TSDBStore TSDBStore
Logger *log.Logger
statMap *expvar.Map
}
// NewService returns a new instance of Service.
func NewService(c Config) *Service {
return &Service{
closing: make(chan struct{}),
Logger: log.New(os.Stderr, "[cluster] ", log.LstdFlags),
statMap: influxdb.NewStatistics("cluster", "cluster", nil),
}
}
// Open opens the network listener and begins serving requests.
func (s *Service) Open() error {
s.Logger.Println("Starting cluster service")
// Begin serving conections.
s.wg.Add(1)
go s.serve()
return nil
}
// SetLogger sets the internal logger to the logger passed in.
func (s *Service) SetLogger(l *log.Logger) {
s.Logger = l
}
// serve accepts connections from the listener and handles them.
func (s *Service) serve() {
defer s.wg.Done()
for {
// Check if the service is shutting down.
select {
case <-s.closing:
return
default:
}
// Accept the next connection.
conn, err := s.Listener.Accept()
if err != nil {
if strings.Contains(err.Error(), "connection closed") {
s.Logger.Printf("cluster service accept error: %s", err)
return
}
s.Logger.Printf("accept error: %s", err)
continue
}
// Delegate connection handling to a separate goroutine.
s.wg.Add(1)
go func() {
defer s.wg.Done()
s.handleConn(conn)
}()
}
}
// Close shuts down the listener and waits for all connections to finish.
func (s *Service) Close() error {
if s.Listener != nil {
s.Listener.Close()
}
// Shut down all handlers.
close(s.closing)
s.wg.Wait()
return nil
}
// handleConn services an individual TCP connection.
func (s *Service) handleConn(conn net.Conn) {
// Ensure connection is closed when service is closed.
closing := make(chan struct{})
defer close(closing)
go func() {
select {
case <-closing:
case <-s.closing:
}
conn.Close()
}()
s.Logger.Printf("accept remote connection from %v\n", conn.RemoteAddr())
defer func() {
s.Logger.Printf("close remote connection from %v\n", conn.RemoteAddr())
}()
for {
// Read type-length-value.
typ, err := ReadType(conn)
if err != nil {
if strings.HasSuffix(err.Error(), "EOF") {
return
}
s.Logger.Printf("unable to read type: %s", err)
return
}
// Delegate message processing by type.
switch typ {
case writeShardRequestMessage:
buf, err := ReadLV(conn)
if err != nil {
s.Logger.Printf("unable to read length-value: %s", err)
return
}
s.statMap.Add(writeShardReq, 1)
err = s.processWriteShardRequest(buf)
if err != nil {
s.Logger.Printf("process write shard error: %s", err)
}
s.writeShardResponse(conn, err)
case executeStatementRequestMessage:
buf, err := ReadLV(conn)
if err != nil {
s.Logger.Printf("unable to read length-value: %s", err)
return
}
err = s.processExecuteStatementRequest(buf)
if err != nil {
s.Logger.Printf("process execute statement error: %s", err)
}
s.writeShardResponse(conn, err)
case createIteratorRequestMessage:
s.statMap.Add(createIteratorReq, 1)
s.processCreateIteratorRequest(conn)
return
case fieldDimensionsRequestMessage:
s.statMap.Add(fieldDimensionsReq, 1)
s.processFieldDimensionsRequest(conn)
return
case seriesKeysRequestMessage:
s.statMap.Add(seriesKeysReq, 1)
s.processSeriesKeysRequest(conn)
return
default:
s.Logger.Printf("cluster service message type not found: %d", typ)
}
}
}
func (s *Service) processExecuteStatementRequest(buf []byte) error {
// Unmarshal the request.
var req ExecuteStatementRequest
if err := req.UnmarshalBinary(buf); err != nil {
return err
}
// Parse the InfluxQL statement.
stmt, err := influxql.ParseStatement(req.Statement())
if err != nil {
return err
}
return s.executeStatement(stmt, req.Database())
}
func (s *Service) executeStatement(stmt influxql.Statement, database string) error {
switch t := stmt.(type) {
case *influxql.DropDatabaseStatement:
return s.TSDBStore.DeleteDatabase(t.Name)
case *influxql.DropMeasurementStatement:
return s.TSDBStore.DeleteMeasurement(database, t.Name)
case *influxql.DropSeriesStatement:
return s.TSDBStore.DeleteSeries(database, t.Sources, t.Condition)
case *influxql.DropRetentionPolicyStatement:
return s.TSDBStore.DeleteRetentionPolicy(database, t.Name)
default:
return fmt.Errorf("%q should not be executed across a cluster", stmt.String())
}
}
func (s *Service) processWriteShardRequest(buf []byte) error {
// Build request
var req WriteShardRequest
if err := req.UnmarshalBinary(buf); err != nil {
return err
}
points := req.Points()
s.statMap.Add(writeShardPointsReq, int64(len(points)))
err := s.TSDBStore.WriteToShard(req.ShardID(), points)
// We may have received a write for a shard that we don't have locally because the
// sending node may have just created the shard (via the metastore) and the write
// arrived before the local store could create the shard. In this case, we need
// to check the metastore to determine what database and retention policy this
// shard should reside within.
if err == tsdb.ErrShardNotFound {
db, rp := req.Database(), req.RetentionPolicy()
if db == "" || rp == "" {
s.Logger.Printf("drop write request: shard=%d. no database or rentention policy received", req.ShardID())
return nil
}
err = s.TSDBStore.CreateShard(req.Database(), req.RetentionPolicy(), req.ShardID())
if err != nil {
s.statMap.Add(writeShardFail, 1)
return fmt.Errorf("create shard %d: %s", req.ShardID(), err)
}
err = s.TSDBStore.WriteToShard(req.ShardID(), points)
if err != nil {
s.statMap.Add(writeShardFail, 1)
return fmt.Errorf("write shard %d: %s", req.ShardID(), err)
}
}
if err != nil {
s.statMap.Add(writeShardFail, 1)
return fmt.Errorf("write shard %d: %s", req.ShardID(), err)
}
return nil
}
func (s *Service) writeShardResponse(w io.Writer, e error) {
// Build response.
var resp WriteShardResponse
if e != nil {
resp.SetCode(1)
resp.SetMessage(e.Error())
} else {
resp.SetCode(0)
}
// Marshal response to binary.
buf, err := resp.MarshalBinary()
if err != nil {
s.Logger.Printf("error marshalling shard response: %s", err)
return
}
// Write to connection.
if err := WriteTLV(w, writeShardResponseMessage, buf); err != nil {
s.Logger.Printf("write shard response error: %s", err)
}
}
func (s *Service) processCreateIteratorRequest(conn net.Conn) {
defer conn.Close()
var itr influxql.Iterator
if err := func() error {
// Parse request.
var req CreateIteratorRequest
if err := DecodeLV(conn, &req); err != nil {
return err
}
// Collect iterator creators for each shard.
ics := make([]influxql.IteratorCreator, 0, len(req.ShardIDs))
for _, shardID := range req.ShardIDs {
ic := s.TSDBStore.ShardIteratorCreator(shardID)
if ic == nil {
return nil
}
ics = append(ics, ic)
}
// Generate a single iterator from all shards.
i, err := influxql.IteratorCreators(ics).CreateIterator(req.Opt)
if err != nil {
return err
}
itr = i
return nil
}(); err != nil {
itr.Close()
s.Logger.Printf("error reading CreateIterator request: %s", err)
EncodeTLV(conn, createIteratorResponseMessage, &CreateIteratorResponse{Err: err})
return
}
// Encode success response.
if err := EncodeTLV(conn, createIteratorResponseMessage, &CreateIteratorResponse{}); err != nil {
s.Logger.Printf("error writing CreateIterator response: %s", err)
return
}
// Exit if no iterator was produced.
if itr == nil {
return
}
// Stream iterator to connection.
if err := influxql.NewIteratorEncoder(conn).EncodeIterator(itr); err != nil {
s.Logger.Printf("error encoding CreateIterator iterator: %s", err)
return
}
}
func (s *Service) processFieldDimensionsRequest(conn net.Conn) {
var fields, dimensions map[string]struct{}
if err := func() error {
// Parse request.
var req FieldDimensionsRequest
if err := DecodeLV(conn, &req); err != nil {
return err
}
// Collect iterator creators for each shard.
ics := make([]influxql.IteratorCreator, 0, len(req.ShardIDs))
for _, shardID := range req.ShardIDs {
ic := s.TSDBStore.ShardIteratorCreator(shardID)
if ic == nil {
return nil
}
ics = append(ics, ic)
}
// Generate a single iterator from all shards.
f, d, err := influxql.IteratorCreators(ics).FieldDimensions(req.Sources)
if err != nil {
return err
}
fields, dimensions = f, d
return nil
}(); err != nil {
s.Logger.Printf("error reading FieldDimensions request: %s", err)
EncodeTLV(conn, fieldDimensionsResponseMessage, &FieldDimensionsResponse{Err: err})
return
}
// Encode success response.
if err := EncodeTLV(conn, fieldDimensionsResponseMessage, &FieldDimensionsResponse{
Fields: fields,
Dimensions: dimensions,
}); err != nil {
s.Logger.Printf("error writing FieldDimensions response: %s", err)
return
}
}
func (s *Service) processSeriesKeysRequest(conn net.Conn) {
var seriesList influxql.SeriesList
if err := func() error {
// Parse request.
var req SeriesKeysRequest
if err := DecodeLV(conn, &req); err != nil {
return err
}
// Collect iterator creators for each shard.
ics := make([]influxql.IteratorCreator, 0, len(req.ShardIDs))
for _, shardID := range req.ShardIDs {
ic := s.TSDBStore.ShardIteratorCreator(shardID)
if ic == nil {
return nil
}
ics = append(ics, ic)
}
// Generate a single iterator from all shards.
a, err := influxql.IteratorCreators(ics).SeriesKeys(req.Opt)
if err != nil {
return err
}
seriesList = a
return nil
}(); err != nil {
s.Logger.Printf("error reading SeriesKeys request: %s", err)
EncodeTLV(conn, seriesKeysResponseMessage, &SeriesKeysResponse{Err: err})
return
}
// Encode success response.
if err := EncodeTLV(conn, seriesKeysResponseMessage, &SeriesKeysResponse{
SeriesList: seriesList,
}); err != nil {
s.Logger.Printf("error writing SeriesKeys response: %s", err)
return
}
}
// ReadTLV reads a type-length-value record from r.
func ReadTLV(r io.Reader) (byte, []byte, error) {
typ, err := ReadType(r)
if err != nil {
return 0, nil, err
}
buf, err := ReadLV(r)
if err != nil {
return 0, nil, err
}
return typ, buf, err
}
// ReadType reads the type from a TLV record.
func ReadType(r io.Reader) (byte, error) {
var typ [1]byte
if _, err := io.ReadFull(r, typ[:]); err != nil {
return 0, fmt.Errorf("read message type: %s", err)
}
return typ[0], nil
}
// ReadLV reads the length-value from a TLV record.
func ReadLV(r io.Reader) ([]byte, error) {
// Read the size of the message.
var sz int64
if err := binary.Read(r, binary.BigEndian, &sz); err != nil {
return nil, fmt.Errorf("read message size: %s", err)
}
if sz >= MaxMessageSize {
return nil, fmt.Errorf("max message size of %d exceeded: %d", MaxMessageSize, sz)
}
// Read the value.
buf := make([]byte, sz)
if _, err := io.ReadFull(r, buf); err != nil {
return nil, fmt.Errorf("read message value: %s", err)
}
return buf, nil
}
// WriteTLV writes a type-length-value record to w.
func WriteTLV(w io.Writer, typ byte, buf []byte) error {
if err := WriteType(w, typ); err != nil {
return err
}
if err := WriteLV(w, buf); err != nil {
return err
}
return nil
}
// WriteType writes the type in a TLV record to w.
func WriteType(w io.Writer, typ byte) error {
if _, err := w.Write([]byte{typ}); err != nil {
return fmt.Errorf("write message type: %s", err)
}
return nil
}
// WriteLV writes the length-value in a TLV record to w.
func WriteLV(w io.Writer, buf []byte) error {
// Write the size of the message.
if err := binary.Write(w, binary.BigEndian, int64(len(buf))); err != nil {
return fmt.Errorf("write message size: %s", err)
}
// Write the value.
if _, err := w.Write(buf); err != nil {
return fmt.Errorf("write message value: %s", err)
}
return nil
}
// EncodeTLV encodes v to a binary format and writes the record-length-value record to w.
func EncodeTLV(w io.Writer, typ byte, v encoding.BinaryMarshaler) error {
if err := WriteType(w, typ); err != nil {
return err
}
if err := EncodeLV(w, v); err != nil {
return err
}
return nil
}
// EncodeLV encodes v to a binary format and writes the length-value record to w.
func EncodeLV(w io.Writer, v encoding.BinaryMarshaler) error {
buf, err := v.MarshalBinary()
if err != nil {
return err
}
if err := WriteLV(w, buf); err != nil {
return err
}
return nil
}
// DecodeTLV reads the type-length-value record from r and unmarshals it into v.
func DecodeTLV(r io.Reader, v encoding.BinaryUnmarshaler) (typ byte, err error) {
typ, err = ReadType(r)
if err != nil {
return 0, err
}
if err := DecodeLV(r, v); err != nil {
return 0, err
}
return typ, nil
}
// DecodeLV reads the length-value record from r and unmarshals it into v.
func DecodeLV(r io.Reader, v encoding.BinaryUnmarshaler) error {
buf, err := ReadLV(r)
if err != nil {
return err
}
if err := v.UnmarshalBinary(buf); err != nil {
return err
}
return nil
}