fdtrack: temporary hack for tracking file descriptor usage

Package fdtrack logs statistics about open file descriptors.
This should help identify the source of #1549.

Godeps/_workspace/src/github.com/huin/goupnp/httpu/httpu.go

@@ -9,6 +9,8 @@ import (
 	"net/http"
 	"sync"
 	"time"
+
+	"github.com/ethereum/go-ethereum/fdtrack"
 )
 
 // HTTPUClient is a client for dealing with HTTPU (HTTP over UDP). Its typical
@@ -25,6 +27,7 @@ func NewHTTPUClient() (*HTTPUClient, error) {
 	if err != nil {
 		return nil, err
 	}
+	fdtrack.Open("upnp")
 	return &HTTPUClient{conn: conn}, nil
 }
 
@@ -33,6 +36,7 @@ func NewHTTPUClient() (*HTTPUClient, error) {
 func (httpu *HTTPUClient) Close() error {
 	httpu.connLock.Lock()
 	defer httpu.connLock.Unlock()
+	fdtrack.Close("upnp")
 	return httpu.conn.Close()
 }
 

Godeps/_workspace/src/github.com/huin/goupnp/soap/soap.go

@@ -7,9 +7,12 @@ import (
 	"encoding/xml"
 	"fmt"
 	"io/ioutil"
+	"net"
 	"net/http"
 	"net/url"
 	"reflect"
+
+	"github.com/ethereum/go-ethereum/fdtrack"
 )
 
 const (
@@ -26,6 +29,17 @@ type SOAPClient struct {
 func NewSOAPClient(endpointURL url.URL) *SOAPClient {
 	return &SOAPClient{
 		EndpointURL: endpointURL,
+		HTTPClient: http.Client{
+			Transport: &http.Transport{
+				Dial: func(network, addr string) (net.Conn, error) {
+					c, err := net.Dial(network, addr)
+					if c != nil {
+						c = fdtrack.WrapConn("upnp", c)
+					}
+					return c, err
+				},
+			},
+		},
 	}
 }
 

Godeps/_workspace/src/github.com/jackpal/go-nat-pmp/natpmp.go

@@ -5,6 +5,8 @@ import (
 	"log"
 	"net"
 	"time"
+
+	"github.com/ethereum/go-ethereum/fdtrack"
 )
 
 // Implement the NAT-PMP protocol, typically supported by Apple routers and open source
@@ -102,6 +104,8 @@ func (n *Client) rpc(msg []byte, resultSize int) (result []byte, err error) {
 	if err != nil {
 		return
 	}
+	fdtrack.Open("natpmp")
+	defer fdtrack.Close("natpmp")
 	defer conn.Close()
 
 	result = make([]byte, resultSize)

Godeps/_workspace/src/github.com/syndtr/goleveldb/leveldb/storage/file_storage.go

@@ -18,6 +18,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/ethereum/go-ethereum/fdtrack"
 	"github.com/syndtr/goleveldb/leveldb/util"
 )
 
@@ -369,6 +370,8 @@ func (fw fileWrap) Close() error {
 	err := fw.File.Close()
 	if err != nil {
 		f.fs.log(fmt.Sprintf("close %s.%d: %v", f.Type(), f.Num(), err))
+	} else {
+		fdtrack.Close("leveldb")
 	}
 	return err
 }
@@ -400,6 +403,7 @@ func (f *file) Open() (Reader, error) {
 		return nil, err
 	}
 ok:
+	fdtrack.Open("leveldb")
 	f.open = true
 	f.fs.open++
 	return fileWrap{of, f}, nil
@@ -418,6 +422,7 @@ func (f *file) Create() (Writer, error) {
 	if err != nil {
 		return nil, err
 	}
+	fdtrack.Open("leveldb")
 	f.open = true
 	f.fs.open++
 	return fileWrap{of, f}, nil