package pubsub

import (
	
	
	
	
	
	
	

	pb 

	
	
	
	
	

	//lint:ignore SA1019 "github.com/libp2p/go-msgio/protoio" is deprecated
	
)

var TraceBufferSize = 1 << 16 // 64K ought to be enough for everyone; famous last words.
var MinTraceBatchSize = 16

// rejection reasons
const (
	RejectBlacklstedPeer      = "blacklisted peer"
	RejectBlacklistedSource   = "blacklisted source"
	RejectMissingSignature    = "missing signature"
	RejectUnexpectedSignature = "unexpected signature"
	RejectUnexpectedAuthInfo  = "unexpected auth info"
	RejectInvalidSignature    = "invalid signature"
	RejectValidationQueueFull = "validation queue full"
	RejectValidationThrottled = "validation throttled"
	RejectValidationFailed    = "validation failed"
	RejectValidationIgnored   = "validation ignored"
	RejectSelfOrigin          = "self originated message"
)

type basicTracer struct {
	ch     chan struct{}
	mx     sync.Mutex
	buf    []*pb.TraceEvent
	lossy  bool
	closed bool
}

func ( *basicTracer) ( *pb.TraceEvent) {
	.mx.Lock()
	defer .mx.Unlock()

	if .closed {
		return
	}

	if .lossy && len(.buf) > TraceBufferSize {
		log.Debug("trace buffer overflow; dropping trace event")
	} else {
		.buf = append(.buf, )
	}

	select {
	case .ch <- struct{}{}:
	default:
	}
}

func ( *basicTracer) () {
	.mx.Lock()
	defer .mx.Unlock()
	if !.closed {
		.closed = true
		close(.ch)
	}
}

// JSONTracer is a tracer that writes events to a file, encoded in ndjson.
type JSONTracer struct {
	basicTracer
	w io.WriteCloser
}

// NewJsonTracer creates a new JSONTracer writing traces to file.
func ( string) (*JSONTracer, error) {
	return OpenJSONTracer(, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
}

// OpenJSONTracer creates a new JSONTracer, with explicit control of OpenFile flags and permissions.
func ( string,  int,  os.FileMode) (*JSONTracer, error) {
	,  := os.OpenFile(, , )
	if  != nil {
		return nil, 
	}

	 := &JSONTracer{w: , basicTracer: basicTracer{ch: make(chan struct{}, 1)}}
	go .doWrite()

	return , nil
}

func ( *JSONTracer) () {
	var  []*pb.TraceEvent
	 := json.NewEncoder(.w)
	for {
		,  := <-.ch

		.mx.Lock()
		 := .buf
		.buf = [:0]
		 = 
		.mx.Unlock()

		for ,  := range  {
			 := .Encode()
			if  != nil {
				log.Warnf("error writing event trace: %s", .Error())
			}
			[] = nil
		}

		if ! {
			.w.Close()
			return
		}
	}
}

var _ EventTracer = (*JSONTracer)(nil)

// PBTracer is a tracer that writes events to a file, as delimited protobufs.
type PBTracer struct {
	basicTracer
	w io.WriteCloser
}

func ( string) (*PBTracer, error) {
	return OpenPBTracer(, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
}

// OpenPBTracer creates a new PBTracer, with explicit control of OpenFile flags and permissions.
func ( string,  int,  os.FileMode) (*PBTracer, error) {
	,  := os.OpenFile(, , )
	if  != nil {
		return nil, 
	}

	 := &PBTracer{w: , basicTracer: basicTracer{ch: make(chan struct{}, 1)}}
	go .doWrite()

	return , nil
}

func ( *PBTracer) () {
	var  []*pb.TraceEvent
	 := protoio.NewDelimitedWriter(.w)
	for {
		,  := <-.ch

		.mx.Lock()
		 := .buf
		.buf = [:0]
		 = 
		.mx.Unlock()

		for ,  := range  {
			 := .WriteMsg()
			if  != nil {
				log.Warnf("error writing event trace: %s", .Error())
			}
			[] = nil
		}

		if ! {
			.w.Close()
			return
		}
	}
}

var _ EventTracer = (*PBTracer)(nil)

const RemoteTracerProtoID = protocol.ID("/libp2p/pubsub/tracer/1.0.0")

// RemoteTracer is a tracer that sends trace events to a remote peer
type RemoteTracer struct {
	basicTracer
	ctx  context.Context
	host host.Host
	peer peer.ID
}

// NewRemoteTracer constructs a RemoteTracer, tracing to the peer identified by pi
func ( context.Context,  host.Host,  peer.AddrInfo) (*RemoteTracer, error) {
	 := &RemoteTracer{ctx: , host: , peer: .ID, basicTracer: basicTracer{ch: make(chan struct{}, 1), lossy: true}}
	.Peerstore().AddAddrs(.ID, .Addrs, peerstore.PermanentAddrTTL)
	go .doWrite()
	return , nil
}

func ( *RemoteTracer) () {
	var  []*pb.TraceEvent

	,  := .openStream()
	if  != nil {
		log.Debugf("error opening remote tracer stream: %s", .Error())
		return
	}

	var  pb.TraceEventBatch

	 := gzip.NewWriter()
	 := protoio.NewDelimitedWriter()

	for {
		,  := <-.ch

		// deadline for batch accumulation
		 := time.Now().Add(time.Second)

		.mx.Lock()
		for len(.buf) < MinTraceBatchSize && time.Now().Before() {
			.mx.Unlock()
			time.Sleep(100 * time.Millisecond)
			.mx.Lock()
		}

		 := .buf
		.buf = [:0]
		 = 
		.mx.Unlock()

		if len() == 0 {
			goto 
		}

		.Batch = 

		 = .WriteMsg(&)
		if  != nil {
			log.Debugf("error writing trace event batch: %s", )
			goto 
		}

		 = .Flush()
		if  != nil {
			log.Debugf("error flushin gzip stream: %s", )
			goto 
		}

	:
		// nil out the buffer to gc consumed events
		for  := range  {
			[] = nil
		}

		if ! {
			if  != nil {
				.Reset()
			} else {
				.Close()
				.Close()
			}
			return
		}

		if  != nil {
			.Reset()
			,  = .openStream()
			if  != nil {
				log.Debugf("error opening remote tracer stream: %s", .Error())
				return
			}

			.Reset()
		}
	}
}

func ( *RemoteTracer) () (network.Stream, error) {
	for {
		,  := context.WithTimeout(.ctx, time.Minute)
		,  := .host.NewStream(, .peer, RemoteTracerProtoID)
		()
		if  != nil {
			if .ctx.Err() != nil {
				return nil, 
			}

			// wait a minute and try again, to account for transient server downtime
			select {
			case <-time.After(time.Minute):
				continue
			case <-.ctx.Done():
				return nil, .ctx.Err()
			}
		}

		return , nil
	}
}

var _ EventTracer = (*RemoteTracer)(nil)