chore: QEMU

.github/workflows/ci.yml

@@ -12,8 +12,8 @@ jobs:
     name: Main Process
     runs-on: ubuntu-latest
     env:
-      GO_VERSION: 1.17
-      GOLANGCI_LINT_VERSION: v1.44.0
+      GO_VERSION: 1.19
+      GOLANGCI_LINT_VERSION: v1.49.0
       CGO_ENABLED: 0
 
     steps:

.github/workflows/go-cross.yml

@@ -1,5 +1,9 @@
 name: Go Matrix
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
 
 jobs:
 
@@ -11,7 +15,7 @@ jobs:
 
     strategy:
       matrix:
-        go-version: [ 1.17, 1.x ]
+        go-version: [ 1.19, 1.x ]
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:

.github/workflows/release.yml

@@ -9,7 +9,7 @@ jobs:
     name: Release Process
     runs-on: ubuntu-latest
     env:
-      GO_VERSION: 1.17
+      GO_VERSION: 1.19
       SEIHON_VERSION: v0.9.0
       CGO_ENABLED: 0
 
@@ -27,12 +27,6 @@ jobs:
         with:
           fetch-depth: 0
 
-      # Install Docker image multi-arch builder
-      - name: Install seihon ${{ env.SEIHON_VERSION }}
-        run: |
-          curl -sSfL https://raw.githubusercontent.com/ldez/seihon/master/godownloader.sh | sh -s -- -b $(go env GOPATH)/bin ${SEIHON_VERSION}
-          seihon --version
-
       - name: Docker Login
         env:
           DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
@@ -40,5 +34,17 @@ jobs:
         run: |
           echo "${DOCKER_PASSWORD}" | docker login --username "${DOCKER_USERNAME}" --password-stdin
 
-      - name: Deploy Docker Images (seihon)
-        run: make publish-images
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      # https://goreleaser.com/ci/actions/
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        with:
+          version: latest
+          args: release --rm-dist
+        env:
+          GITHUB_TOKEN: ${{ secrets.GH_TOKEN_REPO }}

.golangci.yml

@@ -1,47 +1,93 @@
 run:
-  deadline: 2m
+  timeout: 2m
   skip-files: []
+
 linters-settings:
   govet:
-    check-shadowing: true
+    enable-all: true
+    disable:
+      - fieldalignment
   gocyclo:
-    min-complexity: 12
+    min-complexity: 16
   goconst:
     min-len: 3
     min-occurrences: 3
   misspell:
     locale: US
+  funlen:
+    lines: -1
+    statements: 40
+  gofumpt:
+    extra-rules: true
+  depguard:
+    list-type: blacklist
+    include-go-root: false
+    packages:
+      - github.com/pkg/errors
+  godox:
+    keywords:
+      - FIXME
+  gocritic:
+    enabled-tags:
+      - diagnostic
+      - style
+      - performance
+    disabled-checks:
+      - sloppyReassign
+      - rangeValCopy
+      - octalLiteral
+      - paramTypeCombine # already handle by gofumpt.extra-rules
+    settings:
+      hugeParam:
+        sizeThreshold: 100
+  forbidigo:
+    forbid:
+      - '^print(ln)?$'
+      - '^panic$'
+      - '^spew\.Print(f|ln)?$'
+      - '^spew\.Dump$'
 
 linters:
   enable-all: true
   disable:
+    - deadcode # deprecated
+    - exhaustivestruct # deprecated
     - golint # deprecated
-    - scopelint # deprecated
+    - ifshort # deprecated
     - interfacer # deprecated
     - maligned # deprecated
-    - lll
-    - gosec
+    - nosnakecase # deprecated
+    - scopelint # deprecated
+    - scopelint # deprecated
+    - structcheck # deprecated
+    - varcheck # deprecated
+    - execinquery # not relevant (SQL)
+    - rowserrcheck # not relevant (SQL)
+    - sqlclosecheck # not relevant (SQL)
+    - cyclop # duplicate of gocyclo
     - dupl
-    - prealloc
+    - exhaustive
+    - exhaustruct
+    - forbidigo
     - gochecknoglobals
     - gochecknoinits
-    - gomnd
-    - wsl
-    - nlreturn
-    - testpackage
-    - paralleltest
-    - tparallel
     - goerr113
-    - wrapcheck
-    - exhaustive
-    - exhaustivestruct
-    - forbidigo
-    - varnamelen
+    - gomnd
+    - gosec
+    - lll
     - nilnil
-    - ifshort
+    - nlreturn
+    - paralleltest
+    - prealloc
+    - testpackage
+    - tparallel
+    - varnamelen
+    - wrapcheck
+    - wsl
 
 issues:
   exclude-use-default: false
   max-per-linter: 0
   max-same-issues: 0
-  exclude: []
+  exclude:
+    - 'package-comments: should have a package comment'

.goreleaser.yml

@@ -0,0 +1,86 @@
+project_name: whoami
+
+builds:
+  - binary: whoami
+    goos:
+      - windows
+      - darwin
+      - linux
+    goarch:
+      - amd64
+      - arm
+      - arm64
+    goarm:
+      - '7'
+
+changelog:
+  sort: asc
+  filters:
+    exclude:
+      - '^docs:'
+      - '^doc:'
+      - '^chore:'
+      - '^chore(deps):'
+      - '^test:'
+      - '^tests:'
+
+archives:
+  - id: whoami
+    name_template: '{{ .ProjectName }}_v{{ .Version }}_{{ .Os }}_{{ .Arch }}{{ if .Arm}}v{{ .Arm }}{{ end }}'
+    format: tar.gz
+    format_overrides:
+      - goos: windows
+        format: zip
+    files:
+      - LICENSE
+
+docker_manifests:
+  - name_template: 'traefik/whoami:{{ .Tag }}'
+    image_templates:
+      - 'traefik/whoami:{{ .Tag }}-amd64'
+      - 'traefik/whoami:{{ .Tag }}-arm64'
+  - name_template: 'traefik/whoami:latest'
+    image_templates:
+      - 'traefik/whoami:{{ .Tag }}-amd64'
+      - 'traefik/whoami:{{ .Tag }}-arm64'
+  - name_template: 'traefik/whoami:v{{ .Major }}.{{ .Minor }}'
+    image_templates:
+      - 'traefik/whoami:v{{ .Major }}.{{ .Minor }}-amd64'
+      - 'traefik/whoami:v{{ .Major }}.{{ .Minor }}-arm64'
+
+dockers:
+  - use: buildx
+    goos: linux
+    goarch: amd64
+    dockerfile: buildx.Dockerfile
+    image_templates:
+      - 'traefik/whoami:latest-amd64'
+      - 'traefik/whoami:{{ .Tag }}-amd64'
+      - 'traefik/whoami:v{{ .Major }}.{{ .Minor }}-amd64'
+    build_flag_templates:
+      - '--pull'
+      - '--label=org.opencontainers.image.description=Tiny Go webserver that prints OS information and HTTP request to output'
+      - '--label=org.opencontainers.image.created={{.Date}}'
+      - '--label=org.opencontainers.image.title={{.ProjectName}}'
+      - '--label=org.opencontainers.image.revision={{.FullCommit}}'
+      - '--label=org.opencontainers.image.version={{.Version}}'
+      - '--label=org.opencontainers.image.source={{.GitURL}}'
+      - '--platform=linux/amd64'
+
+  - use: buildx
+    goos: linux
+    goarch: arm64
+    dockerfile: buildx.Dockerfile
+    image_templates:
+      - 'traefik/whoami:latest-arm64'
+      - 'traefik/whoami:{{ .Tag }}-arm64'
+      - 'traefik/whoami:v{{ .Major }}.{{ .Minor }}-arm64'
+    build_flag_templates:
+      - '--pull'
+      - '--label=org.opencontainers.image.description=Tiny Go webserver that prints OS information and HTTP request to output'
+      - '--label=org.opencontainers.image.created={{.Date}}'
+      - '--label=org.opencontainers.image.title={{.ProjectName}}'
+      - '--label=org.opencontainers.image.revision={{.FullCommit}}'
+      - '--label=org.opencontainers.image.version={{.Version}}'
+      - '--label=org.opencontainers.image.source={{.GitURL}}'
+      - '--platform=linux/arm64'

Makefile

@@ -1,4 +1,4 @@
-.PHONY: default build image check publish-images
+.PHONY: default check test build image publish-images
 
 TAG_NAME := $(shell git tag -l --contains HEAD)
 

app.go

@@ -1,14 +1,12 @@
 package main
 
 import (
-	"bytes"
 	"crypto/tls"
 	"crypto/x509"
 	"encoding/json"
 	"flag"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"net"
 	"net/http"
@@ -86,7 +84,7 @@ func main() {
 }
 
 func setupMutualTLS(ca string) *tls.Config {
-	clientCACert, err := ioutil.ReadFile(ca)
+	clientCACert, err := os.ReadFile(ca)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -181,7 +179,7 @@ func dataHandler(w http.ResponseWriter, r *http.Request) {
 		attachment = false
 	}
 
-	content := fillContent(size)
+	content := &contentReader{size: size}
 
 	if attachment {
 		w.Header().Set("Content-Disposition", "Attachment")
@@ -311,25 +309,9 @@ func healthHandler(w http.ResponseWriter, req *http.Request) {
 	}
 }
 
-func fillContent(length int64) io.ReadSeeker {
-	charset := "-ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-	b := make([]byte, length)
-
-	for i := range b {
-		b[i] = charset[i%len(charset)]
-	}
-
-	if length > 0 {
-		b[0] = '|'
-		b[length-1] = '|'
-	}
-
-	return bytes.NewReader(b)
-}
-
 func getEnv(key, fallback string) string {
 	value := os.Getenv(key)
-	if len(value) == 0 {
+	if value == "" {
 		return fallback
 	}
 	return value

buildx.Dockerfile

@@ -1,25 +1,17 @@
+# syntax=docker/dockerfile:1.2
 FROM golang:1-alpine as builder
 
 RUN apk --no-cache --no-progress add git ca-certificates tzdata make \
     && update-ca-certificates \
     && rm -rf /var/cache/apk/*
 
-WORKDIR /go/whoami
-
-# Download go modules
-COPY go.mod .
-COPY go.sum .
-RUN GO111MODULE=on GOPROXY=https://proxy.golang.org go mod download
-
-COPY . .
-
-RUN GOARCH={{ .GoARCH }} GOARM={{ .GoARM }} make build
-
+# syntax=docker/dockerfile:1.2
+# Create a minimal container to run a Golang static binary
 FROM scratch
 
 COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
 COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
-COPY --from=builder /go/whoami/whoami .
+COPY whoami /
 
 ENTRYPOINT ["/whoami"]
 EXPOSE 80

content.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"errors"
+	"io"
+)
+
+const contentCharset = "-ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+
+type contentReader struct {
+	size int64
+	cur  int64
+}
+
+// Read implements the io.Read interface.
+func (r *contentReader) Read(p []byte) (int, error) {
+	length := r.size - 1
+
+	if r.cur >= length {
+		return 0, io.EOF
+	}
+	if len(p) == 0 {
+		return 0, nil
+	}
+
+	var n int
+	if r.cur == 0 {
+		p[n] = '|'
+		r.cur++
+		n++
+	}
+
+	for n < len(p) && r.cur <= length {
+		p[n] = contentCharset[int(r.cur)%len(contentCharset)]
+		r.cur++
+		n++
+	}
+
+	if r.cur >= length {
+		p[n-1] = '|'
+	}
+
+	return n, nil
+}
+
+// Seek implements the io.Seek interface.
+func (r *contentReader) Seek(offset int64, whence int) (int64, error) {
+	switch whence {
+	default:
+		return 0, errors.New("seek: invalid whence")
+	case io.SeekStart:
+		offset += 0
+	case io.SeekCurrent:
+		offset += r.cur
+	case io.SeekEnd:
+		offset += r.size - 1
+	}
+
+	if offset < 0 {
+		return 0, errors.New("seek: invalid offset")
+	}
+
+	r.cur = offset
+
+	return offset, nil
+}

content_test.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"io"
+	"testing"
+)
+
+func Test_contentReader_Read(t *testing.T) {
+	tests := []struct {
+		name    string
+		size    int64
+		content string
+	}{
+		{
+			name:    "simple",
+			size:    40,
+			content: "|ABCDEFGHIJKLMNOPQRSTUVWXYZ-ABCDEFGHIJK|",
+		},
+	}
+
+	for _, test := range tests {
+		test := test
+		t.Run(test.name, func(t *testing.T) {
+			t.Parallel()
+
+			d := &contentReader{size: test.size}
+
+			b, err := io.ReadAll(d)
+			if err != nil {
+				t.Errorf("contentReader.Read() error = %v", err)
+				return
+			}
+
+			if string(b) != test.content {
+				t.Errorf("return content does not match expected value: got %s want %s", b, test.content)
+			}
+		})
+	}
+}
+
+func Test_contentReader_ReadSeek(t *testing.T) {
+	tests := []struct {
+		name       string
+		offset     int64
+		seekWhence int
+		size       int64
+		content    string
+	}{
+		{
+			name:       "simple",
+			offset:     10,
+			seekWhence: io.SeekCurrent,
+			size:       40,
+			content:    "JKLMNOPQRSTUVWXYZ-ABCDEFGHIJK|",
+		},
+	}
+
+	for _, test := range tests {
+		test := test
+		t.Run(test.name, func(t *testing.T) {
+			t.Parallel()
+
+			d := &contentReader{size: test.size}
+
+			_, err := d.Seek(test.offset, test.seekWhence)
+			if err != nil {
+				t.Errorf("contentReader.Seek() error = %v", err)
+				return
+			}
+
+			b, err := io.ReadAll(d)
+			if err != nil {
+				t.Errorf("contentReader.Read() error = %v", err)
+				return
+			}
+
+			if string(b) != test.content {
+				t.Errorf("return content does not match expected value: got %s want %s", b, test.content)
+			}
+		})
+	}
+}

go.mod

@@ -1,5 +1,5 @@
 module github.com/traefik/whoami
 
-go 1.17
+go 1.19
 
 require github.com/gorilla/websocket v1.4.2