Merge branch 'port-2021-07-02'

.github/workflows/automerge.yml

+# File managed by web3-bot. DO NOT EDIT.
+# See https://github.com/protocol/.github/ for details.
+
+# Automatically merge pull requests opened by web3-bot, as soon as (and only if) all tests pass.
+# This reduces the friction associated with updating with our workflows.
+
+on: [ pull_request ]
+name: Automerge
+
+jobs:
+  automerge-check:
+    if: github.event.pull_request.user.login == 'web3-bot'
+    runs-on: ubuntu-latest
+    outputs:
+      status: ${{ steps.should-automerge.outputs.status }}
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+    - name: Check if we should automerge
+      id: should-automerge
+      run: |
+        for commit in $(git rev-list --first-parent origin/${{ github.event.pull_request.base.ref }}..${{ github.event.pull_request.head.sha }}); do
+          committer=$(git show --format=$'%ce' -s $commit)
+          echo "Committer: $committer"
+          if [[ "$committer" != "web3-bot@users.noreply.github.com" ]]; then
+            echo "Commit $commit wasn't committed by web3-bot, but by $committer."
+            echo "::set-output name=status::false"
+            exit
+          fi
+        done
+        echo "::set-output name=status::true"
+  automerge:
+    needs: automerge-check
+    runs-on: ubuntu-latest
+    if: ${{ needs.automerge-check.outputs.status == 'true' }}
+    steps:
+    - name: Wait on tests
+      uses: lewagon/wait-on-check-action@bafe56a6863672c681c3cf671f5e10b20abf2eaa # v0.2
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        wait-interval: 10
+        running-workflow-name: 'automerge' # the name of this job
+    - name: Merge PR
+      uses: pascalgn/automerge-action@741c311a47881be9625932b0a0de1b0937aab1ae # v0.13.1
+      env:
+        GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+        MERGE_LABELS: ""
+        MERGE_METHOD: "squash"
+        MERGE_DELETE_BRANCH: true

.github/workflows/go-check.yml

+# File managed by web3-bot. DO NOT EDIT.
+# See https://github.com/protocol/.github/ for details.
+
+on: [push, pull_request]
+name: Go Checks
+
+jobs:
+  unit:
+    runs-on: ubuntu-latest
+    name: All
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: recursive
+      - uses: actions/setup-go@v2
+        with:
+          go-version: "1.16.x"
+      - name: Install staticcheck
+        run: go install honnef.co/go/tools/cmd/staticcheck@434f5f3816b358fe468fa83dcba62d794e7fe04b # 2021.1 (v0.2.0)
+      - name: Check that go.mod is tidy
+        uses: protocol/multiple-go-modules@v1.0
+        with:
+          run: |
+            go mod tidy
+            if [[ -n $(git ls-files --other --exclude-standard --directory -- go.sum) ]]; then
+              echo "go.sum was added by go mod tidy"
+              exit 1
+            fi
+            git diff --exit-code -- go.sum go.mod
+      - name: gofmt
+        if: ${{ success() || failure() }} # run this step even if the previous one failed
+        run: |
+          out=$(gofmt -s -l .)
+          if [[ -n "$out" ]]; then
+            echo $out | awk '{print "::error file=" $0 ",line=0,col=0::File is not gofmt-ed."}'
+            exit 1
+          fi
+      - name: go vet
+        if: ${{ success() || failure() }} # run this step even if the previous one failed
+        uses: protocol/multiple-go-modules@v1.0
+        with:
+          run: go vet ./...
+      - name: staticcheck
+        if: ${{ success() || failure() }} # run this step even if the previous one failed
+        uses: protocol/multiple-go-modules@v1.0
+        with:
+          run: |
+            set -o pipefail
+            staticcheck ./... | sed -e 's@\(.*\)\.go@./\1.go@g'
+

.github/workflows/go-test.yml

+# File managed by web3-bot. DO NOT EDIT.
+# See https://github.com/protocol/.github/ for details.
+
+on: [push, pull_request]
+name: Go Test
+
+jobs:
+  unit:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ "ubuntu", "windows", "macos" ]
+        go: [ "1.15.x", "1.16.x" ]
+    runs-on: ${{ matrix.os }}-latest
+    name: ${{ matrix.os}} (go ${{ matrix.go }})
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: recursive
+      - uses: actions/setup-go@v2
+        with:
+          go-version: ${{ matrix.go }}
+      - name: Go information
+        run: |
+          go version
+          go env
+      - name: Run tests
+        uses: protocol/multiple-go-modules@v1.0
+        with:
+          run: go test -v -coverprofile coverage.txt ./...
+      - name: Run tests (32 bit)
+        if: ${{ matrix.os != 'macos' }} # can't run 32 bit tests on OSX.
+        uses: protocol/multiple-go-modules@v1.0
+        env:
+          GOARCH: 386
+        with:
+          run: go test -v ./...
+      - name: Run tests with race detector
+        if: ${{ matrix.os == 'ubuntu' }} # speed things up. Windows and OSX VMs are slow
+        uses: protocol/multiple-go-modules@v1.0
+        with:
+          run: go test -v -race ./...
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@a1ed4b322b4b38cb846afb5a0ebfa17086917d27 # v1.5.0
+        with:
+          file: coverage.txt
+          env_vars: OS=${{ matrix.os }}, GO=${{ matrix.go }}

.gitlab-ci.yml

+stages:
+  - build
+  - test
+
+variables:
+  BUILD_DIR: "/tmp/$CI_CONCURRENT_PROJECT_ID"
+
+before_script:
+  - mkdir -p $BUILD_DIR/src
+  - cd $BUILD_DIR/src
+  - if [ -d $CI_PROJECT_DIR ]
+  - then
+  -    echo "soft link $CI_PROJECT_DIR exists"
+  - else
+  -    echo "creating soft link $CI_PROJECT_DIR"
+  -    ln -s $CI_PROJECT_DIR
+  - fi
+  - cd $CI_PROJECT_DIR
+
+build:
+  stage: build
+  tags:
+    - testing
+  script:
+    - echo $CI_JOB_STAGE
+    - go build
+
+test:
+  stage: test
+  tags:
+    - testing
+  script:
+    - echo $CI_JOB_STAGE
+    - go test -cover
+  coverage: '/coverage: \d+.\d+% of statements/'

LICENSE

+The MIT License (MIT)
+
+Copyright (c) 2016 Jeromy Johnson
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

-# go-tcp-transport
+go-tcp-transport
+==================
 
-dms3 p2p go-tcp-transport
\ No newline at end of file
+[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](https://protocol.ai)
+[![](https://img.shields.io/badge/project-libp2p-yellow.svg?style=flat-square)](https://libp2p.io/)
+[![](https://img.shields.io/badge/freenode-%23libp2p-yellow.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23libp2p)
+[![Discourse posts](https://img.shields.io/discourse/https/discuss.libp2p.io/posts.svg)](https://discuss.libp2p.io)
+[![Coverage Status](https://coveralls.io/repos/github/libp2p/go-tcp-transport/badge.svg?branch=master)](https://coveralls.io/github/libp2p/go-tcp-transport?branch=master)
+[![Travis CI](https://travis-ci.com/libp2p/go-tcp-transport.svg?branch=master)](https://travis-ci.com/libp2p/go-tcp-transport)
+
+> A libp2p transport implementation for tcp, including reuseport socket options.
+
+`go-tcp-transport` is an implementation of the [libp2p transport
+interface][concept-transport] that streams data over TCP/IP sockets. It is
+included by default in the main [`go-libp2p`][go-libp2p] "entry point" module.
+
+## Table of Contents
+
+- [go-tcp-transport](#go-tcp-transport)
+    - [Table of Contents](#table-of-contents)
+    - [Install](#install)
+    - [Usage](#usage)
+    - [Security and Multiplexing](#security-and-multiplexing)
+    - [reuseport](#reuseport)
+    - [Contribute](#contribute)
+    - [License](#license)
+
+## Install
+
+`go-tcp-transport` is included as a dependency of `go-libp2p`, which is the most
+common libp2p entry point. If you depend on `go-libp2p`, there is generally no
+need to explicitly depend on this module.
+
+`go-tcp-transport` is a standard Go module which can be installed with:
+
+``` sh
+go get github.com/libp2p/go-tcp-transport
+```
+
+
+This repo is [gomod](https://github.com/golang/go/wiki/Modules)-compatible, and users of
+go 1.11 and later with modules enabled will automatically pull the latest tagged release
+by referencing this package. Upgrades to future releases can be managed using `go get`,
+or by editing your `go.mod` file as [described by the gomod documentation](https://github.com/golang/go/wiki/Modules#how-to-upgrade-and-downgrade-dependencies).
+
+## Usage
+
+TCP is one of the default transports enabled when constructing a standard libp2p
+Host, along with [WebSockets](https://github.com/libp2p/go-ws-transport).
+
+Calling [`libp2p.New`][godoc-libp2p-new] to construct a libp2p Host will enable
+the TCP transport, unless you override the default transports by passing in
+`Options` to `libp2p.New`.
+
+To explicitly enable the TCP transport while constructing a host, use the
+`libp2p.Transport` option, passing in the `NewTCPTransport` constructor function:
+
+``` go
+
+import (
+    "context"
+
+    libp2p "github.com/libp2p/go-libp2p"
+    tcp "github.com/libp2p/go-tcp-transport"
+)
+
+ctx := context.Background()
+
+// TCP only:
+h, err := libp2p.New(ctx,
+    libp2p.Transport(tcp.NewTCPTransport)
+)
+```
+
+The example above will replace the default transports with a single TCP
+transport. To add multiple tranports, use `ChainOptions`:
+
+``` go
+// TCP and QUIC:
+h, err := libp2p.New(ctx,
+    libp2p.ChainOptions(
+        libp2p.Transport(tcp.NewTCPTransport),
+        libp2p.Transport(quic.NewTransport)) // see https://github.com/libp2p/go-libp2p-quic-transport
+)
+```
+
+## Addresses
+
+The TCP transport supports [multiaddrs][multiaddr] that contain a `tcp`
+component, provided that there is sufficient addressing information for the IP
+layer of the connection.
+
+Examples:
+
+| addr                       | description                                        |
+|----------------------------|----------------------------------------------------|
+| `/ip4/1.2.3.4/tcp/1234`    | IPv4: 1.2.3.4, TCP port 1234                       |
+| `/ip6/::1/tcp/1234`        | IPv6 loopback, TCP port 1234                       |
+| `/dns4/example.com/tcp/80` | DNS over IPv4, hostname `example.com`, TCP port 80 |
+
+
+Support for IP layer protocols is provided by the
+[go-multiaddr-net](https://github.com/multiformats/go-multiaddr-net) module.
+
+## Security and Multiplexing
+
+Because TCP lacks native connection security and stream multiplexing facilities,
+the TCP transport uses a [transport upgrader][transport-upgrader] to provide
+those features. The transport upgrader negotiates transport security and
+multiplexing for each connection according to the protocols supported by each
+party.
+
+## reuseport
+
+The [`SO_REUSEPORT`][explain-reuseport] socket option allows multiple processes
+or threads to bind to the same TCP port, provided that all of them set the
+socket option. This has some performance benefits, and it can potentially assist
+in NAT traversal by only requiring one port to be accessible for many
+connections.
+
+The reuseport functionality is provided by a seperate module,
+[go-reuseport-transport](https://github.com/libp2p/go-reuseport-transport). It
+is enabled by default, but can be disabled at runtime by setting the
+`LIBP2P_TCP_REUSEPORT` environment variable to `false` or `0`.
+
+## Contribute
+
+PRs are welcome!
+
+Small note: If editing the Readme, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
+
+## License
+
+MIT © Jeromy Johnson
+
+---
+
+The last gx published version of this module was: 2.0.28: QmTGiDkw4eeKq31wwpQRk5GwWiReaxrcTQLuCCLWgfKo5M
+
+<!-- reference links -->
+[go-libp2p]: https://github.com/libp2p/go-libp2p
+[concept-transport]: https://docs.libp2p.io/concepts/transport/
+[interface-host]: https://github.com/libp2p/go-libp2p-core/blob/master/host/host.go
+[godoc-libp2p-new]: https://godoc.org/github.com/libp2p/go-libp2p#New
+[transport-upgrader]: https://github.com/libp2p/go-libp2p-transport-upgrader
+[explain-reuseport]: https://lwn.net/Articles/542629/
+[multiaddr]: https://github.com/multiformats/multiaddr

codecov.yml

+coverage:
+  range: "50...100"
+comment: off

go.mod

+module gitlab.dms3.io/p2p/go-tcp-transport
+
+require (
+	github.com/marten-seemann/tcp v0.0.0-20210406111302-dfbc87cc63fd
+	github.com/mikioh/tcpinfo v0.0.0-20190314235526-30a79bb1804b
+	github.com/multiformats/go-multiaddr v0.3.3
+	github.com/multiformats/go-multiaddr-fmt v0.1.0
+	github.com/multiformats/go-multihash v0.0.15 // indirect
+	github.com/prometheus/client_golang v1.10.0
+	gitlab.dms3.io/dms3/public/go-log v0.0.1
+	gitlab.dms3.io/p2p/go-p2p-core v0.0.1
+	gitlab.dms3.io/p2p/go-p2p-mplex v0.0.1
+	gitlab.dms3.io/p2p/go-p2p-testing v0.0.1
+	gitlab.dms3.io/p2p/go-p2p-transport-upgrader v0.0.1
+	gitlab.dms3.io/p2p/go-reuseport v0.0.1
+	gitlab.dms3.io/p2p/go-reuseport-transport v0.0.1
+)
+
+go 1.15

go.sum

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metrics.go

+package tcp
+
+import (
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/marten-seemann/tcp"
+	"github.com/mikioh/tcpinfo"
+	manet "github.com/multiformats/go-multiaddr/net"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+var (
+	newConns      *prometheus.CounterVec
+	closedConns   *prometheus.CounterVec
+	segsSentDesc  *prometheus.Desc
+	segsRcvdDesc  *prometheus.Desc
+	bytesSentDesc *prometheus.Desc
+	bytesRcvdDesc *prometheus.Desc
+)
+
+var collector *aggregatingCollector
+
+func init() {
+	segsSentDesc = prometheus.NewDesc("tcp_sent_segments_total", "TCP segments sent", nil, nil)
+	segsRcvdDesc = prometheus.NewDesc("tcp_rcvd_segments_total", "TCP segments received", nil, nil)
+	bytesSentDesc = prometheus.NewDesc("tcp_sent_bytes", "TCP bytes sent", nil, nil)
+	bytesRcvdDesc = prometheus.NewDesc("tcp_rcvd_bytes", "TCP bytes received", nil, nil)
+
+	collector = newAggregatingCollector()
+	prometheus.MustRegister(collector)
+
+	const direction = "direction"
+
+	newConns = prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "tcp_connections_new_total",
+			Help: "TCP new connections",
+		},
+		[]string{direction},
+	)
+	prometheus.MustRegister(newConns)
+	closedConns = prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "tcp_connections_closed_total",
+			Help: "TCP connections closed",
+		},
+		[]string{direction},
+	)
+	prometheus.MustRegister(closedConns)
+}
+
+type aggregatingCollector struct {
+	mutex sync.Mutex
+
+	highestID     uint64
+	conns         map[uint64] /* id */ *tracingConn
+	rtts          prometheus.Histogram
+	connDurations prometheus.Histogram
+}
+
+var _ prometheus.Collector = &aggregatingCollector{}
+
+func newAggregatingCollector() *aggregatingCollector {
+	return &aggregatingCollector{
+		conns: make(map[uint64]*tracingConn),
+		rtts: prometheus.NewHistogram(prometheus.HistogramOpts{
+			Name:    "tcp_rtt",
+			Help:    "TCP round trip time",
+			Buckets: prometheus.ExponentialBuckets(0.001, 1.25, 40), // 1ms to ~6000ms
+		}),
+		connDurations: prometheus.NewHistogram(prometheus.HistogramOpts{
+			Name:    "tcp_connection_duration",
+			Help:    "TCP Connection Duration",
+			Buckets: prometheus.ExponentialBuckets(1, 1.5, 40), // 1s to ~12 weeks
+		}),
+	}
+}
+
+func (c *aggregatingCollector) AddConn(t *tracingConn) uint64 {
+	c.mutex.Lock()
+	defer c.mutex.Unlock()
+	c.highestID++
+	c.conns[c.highestID] = t
+	return c.highestID
+}
+
+func (c *aggregatingCollector) removeConn(id uint64) {
+	delete(c.conns, id)
+}
+
+func (c *aggregatingCollector) Describe(descs chan<- *prometheus.Desc) {
+	descs <- c.rtts.Desc()
+	descs <- c.connDurations.Desc()
+	if hasSegmentCounter {
+		descs <- segsSentDesc
+		descs <- segsRcvdDesc
+	}
+	if hasByteCounter {
+		descs <- bytesSentDesc
+		descs <- bytesRcvdDesc
+	}
+}
+
+func (c *aggregatingCollector) Collect(metrics chan<- prometheus.Metric) {
+	now := time.Now()
+	c.mutex.Lock()
+	var segsSent, segsRcvd uint64
+	var bytesSent, bytesRcvd uint64
+	for _, conn := range c.conns {
+		info, err := conn.getTCPInfo()
+		if err != nil {
+			if strings.Contains(err.Error(), "use of closed network connection") {
+				c.closedConn(conn)
+				continue
+			}
+			log.Errorf("Failed to get TCP info: %s", err)
+			continue
+		}
+		if hasSegmentCounter {
+			segsSent += getSegmentsSent(info)
+			segsRcvd += getSegmentsRcvd(info)
+		}
+		if hasByteCounter {
+			bytesSent += getBytesSent(info)
+			bytesRcvd += getBytesRcvd(info)
+		}
+		c.rtts.Observe(info.RTT.Seconds())
+		c.connDurations.Observe(now.Sub(conn.startTime).Seconds())
+		if info.State == tcpinfo.Closed {
+			c.closedConn(conn)
+		}
+	}
+	c.mutex.Unlock()
+	metrics <- c.rtts
+	metrics <- c.connDurations
+	if hasSegmentCounter {
+		segsSentMetric, err := prometheus.NewConstMetric(segsSentDesc, prometheus.CounterValue, float64(segsSent))
+		if err != nil {
+			log.Errorf("creating tcp_sent_segments_total metric failed: %v", err)
+			return
+		}
+		segsRcvdMetric, err := prometheus.NewConstMetric(segsRcvdDesc, prometheus.CounterValue, float64(segsRcvd))
+		if err != nil {
+			log.Errorf("creating tcp_rcvd_segments_total metric failed: %v", err)
+			return
+		}
+		metrics <- segsSentMetric
+		metrics <- segsRcvdMetric
+	}
+	if hasByteCounter {
+		bytesSentMetric, err := prometheus.NewConstMetric(bytesSentDesc, prometheus.CounterValue, float64(bytesSent))
+		if err != nil {
+			log.Errorf("creating tcp_sent_bytes metric failed: %v", err)
+			return
+		}
+		bytesRcvdMetric, err := prometheus.NewConstMetric(bytesRcvdDesc, prometheus.CounterValue, float64(bytesRcvd))
+		if err != nil {
+			log.Errorf("creating tcp_rcvd_bytes metric failed: %v", err)
+			return
+		}
+		metrics <- bytesSentMetric
+		metrics <- bytesRcvdMetric
+	}
+}
+
+func (c *aggregatingCollector) closedConn(conn *tracingConn) {
+	collector.removeConn(conn.id)
+	closedConns.WithLabelValues(conn.getDirection()).Inc()
+}
+
+type tracingConn struct {
+	id uint64
+
+	startTime time.Time
+	isClient  bool
+
+	manet.Conn
+	tcpConn *tcp.Conn
+}
+
+func newTracingConn(c manet.Conn, isClient bool) (*tracingConn, error) {
+	conn, err := tcp.NewConn(c)
+	if err != nil {
+		return nil, err
+	}
+	tc := &tracingConn{
+		startTime: time.Now(),
+		isClient:  isClient,
+		Conn:      c,
+		tcpConn:   conn,
+	}
+	tc.id = collector.AddConn(tc)
+	newConns.WithLabelValues(tc.getDirection()).Inc()
+	return tc, nil
+}
+
+func (c *tracingConn) getDirection() string {
+	if c.isClient {
+		return "outgoing"
+	}
+	return "incoming"
+}
+
+func (c *tracingConn) Close() error {
+	return c.Conn.Close()
+}
+
+func (c *tracingConn) getTCPInfo() (*tcpinfo.Info, error) {
+	var o tcpinfo.Info
+	var b [256]byte
+	i, err := c.tcpConn.Option(o.Level(), o.Name(), b[:])
+	if err != nil {
+		return nil, err
+	}
+	info := i.(*tcpinfo.Info)
+	return info, nil
+}
+
+type tracingListener struct {
+	manet.Listener
+}
+
+func (l *tracingListener) Accept() (manet.Conn, error) {
+	conn, err := l.Listener.Accept()
+	if err != nil {
+		return nil, err
+	}
+	return newTracingConn(conn, false)
+}

metrics_darwin.go

+//+build darwin
+
+package tcp
+
+import "github.com/mikioh/tcpinfo"
+
+const (
+	hasSegmentCounter = true
+	hasByteCounter    = true
+)
+
+func getSegmentsSent(info *tcpinfo.Info) uint64 { return info.Sys.SegsSent }
+func getSegmentsRcvd(info *tcpinfo.Info) uint64 { return info.Sys.SegsReceived }
+func getBytesSent(info *tcpinfo.Info) uint64    { return info.Sys.BytesSent }
+func getBytesRcvd(info *tcpinfo.Info) uint64    { return info.Sys.BytesReceived }

metrics_general.go

+//+build !linux,!darwin
+
+package tcp
+
+import "github.com/mikioh/tcpinfo"
+
+const (
+	hasSegmentCounter = false
+	hasByteCounter    = false
+)
+
+func getSegmentsSent(info *tcpinfo.Info) uint64 { return 0 }
+func getSegmentsRcvd(info *tcpinfo.Info) uint64 { return 0 }
+func getBytesSent(info *tcpinfo.Info) uint64    { return 0 }
+func getBytesRcvd(info *tcpinfo.Info) uint64    { return 0 }

metrics_linux.go

+//+build linux
+
+package tcp
+
+import "github.com/mikioh/tcpinfo"
+
+const (
+	hasSegmentCounter = true
+	hasByteCounter    = false
+)
+
+func getSegmentsSent(info *tcpinfo.Info) uint64 { return uint64(info.Sys.SegsOut) }
+func getSegmentsRcvd(info *tcpinfo.Info) uint64 { return uint64(info.Sys.SegsIn) }
+func getBytesSent(info *tcpinfo.Info) uint64    { return 0 }
+func getBytesRcvd(info *tcpinfo.Info) uint64    { return 0 }

reuseport.go

+package tcp
+
+import (
+	"os"
+	"strings"
+
+	"gitlab.dms3.io/p2p/go-reuseport"
+)
+
+// envReuseport is the env variable name used to turn off reuse port.
+// It default to true.
+const envReuseport = "LIBP2P_TCP_REUSEPORT"
+const deprecatedEnvReuseport = "IPFS_REUSEPORT"
+
+// envReuseportVal stores the value of envReuseport. defaults to true.
+var envReuseportVal = true
+
+func init() {
+	v := strings.ToLower(os.Getenv(envReuseport))
+	if v == "false" || v == "f" || v == "0" {
+		envReuseportVal = false
+		log.Infof("REUSEPORT disabled (LIBP2P_TCP_REUSEPORT=%s)", v)
+	}
+	v, exist := os.LookupEnv(deprecatedEnvReuseport)
+	if exist {
+		log.Warn("IPFS_REUSEPORT is deprecated, use LIBP2P_TCP_REUSEPORT instead")
+		if v == "false" || v == "f" || v == "0" {
+			envReuseportVal = false
+			log.Infof("REUSEPORT disabled (IPFS_REUSEPORT=%s)", v)
+		}
+	}
+}
+
+// reuseportIsAvailable returns whether reuseport is available to be used. This
+// is here because we want to be able to turn reuseport on and off selectively.
+// For now we use an ENV variable, as this handles our pressing need:
+//
+//   LIBP2P_TCP_REUSEPORT=false ipfs daemon
+//
+// If this becomes a sought after feature, we could add this to the config.
+// In the end, reuseport is a stop-gap.
+func ReuseportIsAvailable() bool {
+	return envReuseportVal && reuseport.Available()
+}

tcp.go

+package tcp
+
+import (
+	"context"
+	"net"
+	"runtime"
+	"time"
+
+	logging "gitlab.dms3.io/dms3/public/go-log"
+	"gitlab.dms3.io/p2p/go-p2p-core/peer"
+	"gitlab.dms3.io/p2p/go-p2p-core/transport"
+	tptu "gitlab.dms3.io/p2p/go-p2p-transport-upgrader"
+	rtpt "gitlab.dms3.io/p2p/go-reuseport-transport"
+
+	ma "github.com/multiformats/go-multiaddr"
+	mafmt "github.com/multiformats/go-multiaddr-fmt"
+	manet "github.com/multiformats/go-multiaddr/net"
+)
+
+// DefaultConnectTimeout is the (default) maximum amount of time the TCP
+// transport will spend on the initial TCP connect before giving up.
+var DefaultConnectTimeout = 5 * time.Second
+
+var log = logging.Logger("tcp-tpt")
+
+const keepAlivePeriod = 30 * time.Second
+
+type canKeepAlive interface {
+	SetKeepAlive(bool) error
+	SetKeepAlivePeriod(time.Duration) error
+}
+
+var _ canKeepAlive = &net.TCPConn{}
+
+func tryKeepAlive(conn net.Conn, keepAlive bool) {
+	keepAliveConn, ok := conn.(canKeepAlive)
+	if !ok {
+		log.Errorf("Can't set TCP keepalives.")
+		return
+	}
+	if err := keepAliveConn.SetKeepAlive(keepAlive); err != nil {
+		log.Errorf("Failed to enable TCP keepalive: %s", err)
+		return
+	}
+
+	if runtime.GOOS != "openbsd" {
+		if err := keepAliveConn.SetKeepAlivePeriod(keepAlivePeriod); err != nil {
+			log.Errorf("Failed set keepalive period: %s", err)
+		}
+	}
+}
+
+// try to set linger on the connection, if possible.
+func tryLinger(conn net.Conn, sec int) {
+	type canLinger interface {
+		SetLinger(int) error
+	}
+
+	if lingerConn, ok := conn.(canLinger); ok {
+		_ = lingerConn.SetLinger(sec)
+	}
+}
+
+type tcpListener struct {
+	manet.Listener
+	sec int
+}
+
+func (ll *tcpListener) Accept() (manet.Conn, error) {
+	c, err := ll.Listener.Accept()
+	if err != nil {
+		return nil, err
+	}
+	tryLinger(c, ll.sec)
+	tryKeepAlive(c, true)
+	return c, nil
+}
+
+// TcpTransport is the TCP transport.
+type TcpTransport struct {
+	// Connection upgrader for upgrading insecure stream connections to
+	// secure multiplex connections.
+	Upgrader *tptu.Upgrader
+
+	// Explicitly disable reuseport.
+	DisableReuseport bool
+
+	// TCP connect timeout
+	ConnectTimeout time.Duration
+
+	reuse rtpt.Transport
+}
+
+var _ transport.Transport = &TcpTransport{}
+
+// NewTCPTransport creates a tcp transport object that tracks dialers and listeners
+// created. It represents an entire tcp stack (though it might not necessarily be)
+func NewTCPTransport(upgrader *tptu.Upgrader) *TcpTransport {
+	return &TcpTransport{Upgrader: upgrader, ConnectTimeout: DefaultConnectTimeout}
+}
+
+var dialMatcher = mafmt.And(mafmt.IP, mafmt.Base(ma.P_TCP))
+
+// CanDial returns true if this transport believes it can dial the given
+// multiaddr.
+func (t *TcpTransport) CanDial(addr ma.Multiaddr) bool {
+	return dialMatcher.Matches(addr)
+}
+
+func (t *TcpTransport) maDial(ctx context.Context, raddr ma.Multiaddr) (manet.Conn, error) {
+	// Apply the deadline iff applicable
+	if t.ConnectTimeout > 0 {
+		deadline := time.Now().Add(t.ConnectTimeout)
+		if d, ok := ctx.Deadline(); !ok || deadline.Before(d) {
+			var cancel func()
+			ctx, cancel = context.WithDeadline(ctx, deadline)
+			defer cancel()
+		}
+	}
+
+	if t.UseReuseport() {
+		return t.reuse.DialContext(ctx, raddr)
+	}
+	var d manet.Dialer
+	return d.DialContext(ctx, raddr)
+}
+
+// Dial dials the peer at the remote address.
+func (t *TcpTransport) Dial(ctx context.Context, raddr ma.Multiaddr, p peer.ID) (transport.CapableConn, error) {
+	conn, err := t.maDial(ctx, raddr)
+	if err != nil {
+		return nil, err
+	}
+	// Set linger to 0 so we never get stuck in the TIME-WAIT state. When
+	// linger is 0, connections are _reset_ instead of closed with a FIN.
+	// This means we can immediately reuse the 5-tuple and reconnect.
+	tryLinger(conn, 0)
+	tryKeepAlive(conn, true)
+	c, err := newTracingConn(conn, true)
+	if err != nil {
+		return nil, err
+	}
+	return t.Upgrader.UpgradeOutbound(ctx, t, c, p)
+}
+
+// UseReuseport returns true if reuseport is enabled and available.
+func (t *TcpTransport) UseReuseport() bool {
+	return !t.DisableReuseport && ReuseportIsAvailable()
+}
+
+func (t *TcpTransport) maListen(laddr ma.Multiaddr) (manet.Listener, error) {
+	if t.UseReuseport() {
+		return t.reuse.Listen(laddr)
+	}
+	return manet.Listen(laddr)
+}
+
+// Listen listens on the given multiaddr.
+func (t *TcpTransport) Listen(laddr ma.Multiaddr) (transport.Listener, error) {
+	list, err := t.maListen(laddr)
+	if err != nil {
+		return nil, err
+	}
+	list = &tracingListener{&tcpListener{list, 0}}
+	return t.Upgrader.UpgradeListener(t, list), nil
+}
+
+// Protocols returns the list of terminal protocols this transport can dial.
+func (t *TcpTransport) Protocols() []int {
+	return []int{ma.P_TCP}
+}
+
+// Proxy always returns false for the TCP transport.
+func (t *TcpTransport) Proxy() bool {
+	return false
+}
+
+func (t *TcpTransport) String() string {
+	return "TCP"
+}

tcp_test.go

+package tcp
+
+import (
+	"testing"
+
+	"gitlab.dms3.io/p2p/go-p2p-core/crypto"
+	"gitlab.dms3.io/p2p/go-p2p-core/peer"
+
+	"gitlab.dms3.io/p2p/go-p2p-core/sec/insecure"
+	mplex "gitlab.dms3.io/p2p/go-p2p-mplex"
+	tptu "gitlab.dms3.io/p2p/go-p2p-transport-upgrader"
+
+	ttransport "gitlab.dms3.io/p2p/go-p2p-testing/suites/transport"
+
+	ma "github.com/multiformats/go-multiaddr"
+)
+
+func TestTcpTransport(t *testing.T) {
+	for i := 0; i < 2; i++ {
+		ia := makeInsecureTransport(t)
+		ib := makeInsecureTransport(t)
+
+		ta := NewTCPTransport(&tptu.Upgrader{
+			Secure: ia,
+			Muxer:  new(mplex.Transport),
+		})
+		tb := NewTCPTransport(&tptu.Upgrader{
+			Secure: ib,
+			Muxer:  new(mplex.Transport),
+		})
+
+		zero := "/ip4/127.0.0.1/tcp/0"
+		ttransport.SubtestTransport(t, ta, tb, zero, ia.LocalPeer())
+
+		envReuseportVal = false
+	}
+	envReuseportVal = true
+}
+
+func TestTcpTransportCantDialDNS(t *testing.T) {
+	for i := 0; i < 2; i++ {
+		dnsa, err := ma.NewMultiaddr("/dns4/example.com/tcp/1234")
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		tpt := NewTCPTransport(&tptu.Upgrader{
+			Secure: makeInsecureTransport(t),
+			Muxer:  new(mplex.Transport),
+		})
+
+		if tpt.CanDial(dnsa) {
+			t.Fatal("shouldn't be able to dial dns")
+		}
+
+		envReuseportVal = false
+	}
+	envReuseportVal = true
+}
+
+func TestTcpTransportCantListenUtp(t *testing.T) {
+	for i := 0; i < 2; i++ {
+		utpa, err := ma.NewMultiaddr("/ip4/127.0.0.1/udp/0/utp")
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		tpt := NewTCPTransport(&tptu.Upgrader{
+			Secure: makeInsecureTransport(t),
+			Muxer:  new(mplex.Transport),
+		})
+
+		_, err = tpt.Listen(utpa)
+		if err == nil {
+			t.Fatal("shouldnt be able to listen on utp addr with tcp transport")
+		}
+
+		envReuseportVal = false
+	}
+	envReuseportVal = true
+}
+
+func makeInsecureTransport(t *testing.T) *insecure.Transport {
+	priv, pub, err := crypto.GenerateKeyPair(crypto.Ed25519, 256)
+	if err != nil {
+		t.Fatal(err)
+	}
+	id, err := peer.IDFromPublicKey(pub)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return insecure.NewWithIdentity(id, priv)
+}