enable more linters, report coverage and cache mods

.github/workflows/build_test.yml

@@ -13,6 +13,18 @@ jobs:
         go-version: ${{ matrix.go-version }}
     - name: Checkout code
       uses: actions/checkout@v2
+    - id: cache-paths
+      run: |
+        echo "::set-output name=cache::$(go env GOCACHE)"
+        echo "::set-output name=mod-cache::$(go env GOMODCACHE)"
+    - name: Cache go modules
+      uses: actions/cache@v2
+      with:
+        path: |
+          ${{ steps.cache-paths.outputs.cache }}
+          ${{ steps.cache-paths.outputs.mod-cache }}
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: ${{ runner.os }}-go-
     - name: Build Test v3
       run: |
-        make build_test
+        make build_test

.github/workflows/test.yml

@@ -14,6 +14,25 @@ jobs:
         go-version: ${{ matrix.go-version }}
     - name: Checkout code
       uses: actions/checkout@v2
+    - id: go-env
+      run: |
+        echo "::set-output name=cache::$(go env GOCACHE)"
+        echo "::set-output name=mod-cache::$(go env GOMODCACHE)"
+    - name: Cache go modules
+      uses: actions/cache@v2
+      with:
+        path: |
+          ${{ steps.go-env.outputs.cache }}
+          ${{ steps.go-env.outputs.mod-cache }}
+        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+        restore-keys: ${{ runner.os }}-go-
     - name: Test
       run: |
-        go test ./...
+        go test -coverprofile='coverage.out' -covermode=atomic ./...
+    - name: Upload Code Coverage
+      uses: codecov/codecov-action@v2
+      with:
+        fail_ci_if_error: true
+        files: coverage.out
+        flags: ${{ runner.os }},go-${{ matrix.go-version }}
+        token: ${{ secrets.CODECOV_TOKEN }}

.golangci.yml

@@ -1,9 +1,35 @@
+issues:
+  max-same-issues: 0
+  exclude-rules: 
+  - linters: 
+    - gosec
+    text:  "G204"
+  - linters: 
+    - revive
+    text:  "var-naming"
+  - linters: 
+    - revive
+    text:  "exported"
 linters:
   enable:
+    - asciicheck
+    - durationcheck
     - errorlint
     - gci
+    - gofmt
+    - gofumpt
+    - goimports
+    - gosec
     - gosimple
+    - importas
+    - megacheck
+    - misspell
+    - nakedret
+    - nolintlint
+    - predeclared
+    - revive
     - typecheck
+    - unparam
   disable:
     - deadcode
     - errcheck

_tools/v3migration/v3migration.go

@@ -103,5 +103,4 @@ func main() {
 			issueRemoveUnusedValue()
 		}
 	}
-
 }

cpu/cpu.go

@@ -51,8 +51,10 @@ type lastPercent struct {
 	lastPerCPUTimes []TimesStat
 }
 
-var lastCPUPercent lastPercent
-var invoke common.Invoker = common.Invoke{}
+var (
+	lastCPUPercent lastPercent
+	invoke         common.Invoker = common.Invoke{}
+)
 
 func init() {
 	lastCPUPercent.Lock()

cpu/cpu_aix.go

@@ -1,3 +1,4 @@
+//go:build aix
 // +build aix
 
 package cpu
@@ -36,9 +37,9 @@ func TimesWithContext(ctx context.Context, percpu bool) ([]TimesStat, error) {
 		}
 		ct := &TimesStat{
 			CPU:    "cpu-total",
-			Idle:   float64(c.IdlePct), 
-			User:   float64(c.UserPct), 
-			System: float64(c.KernPct), 
+			Idle:   float64(c.IdlePct),
+			User:   float64(c.UserPct),
+			System: float64(c.KernPct),
 			Iowait: float64(c.WaitPct),
 		}
 		ret = append(ret, *ct)
@@ -56,11 +57,11 @@ func InfoWithContext(ctx context.Context) ([]InfoStat, error) {
 		return nil, err
 	}
 	info := InfoStat{
-		CPU: 0,
-		Mhz: float64(c.ProcessorHz / 1000000),
+		CPU:   0,
+		Mhz:   float64(c.ProcessorHz / 1000000),
 		Cores: int32(c.NCpusCfg),
-		}
-	result := []InfoStat{info};
+	}
+	result := []InfoStat{info}
 	return result, nil
 }
 
@@ -71,4 +72,3 @@ func CountsWithContext(ctx context.Context, logical bool) (int, error) {
 	}
 	return c.NCpusCfg, nil
 }
-

cpu/cpu_darwin.go

@@ -1,3 +1,4 @@
+//go:build darwin
 // +build darwin
 
 package cpu

cpu/cpu_darwin_cgo.go

@@ -1,5 +1,5 @@
-// +build darwin
-// +build cgo
+//go:build darwin && cgo
+// +build darwin,cgo
 
 package cpu
 
@@ -108,5 +108,4 @@ func allCPUTimes() ([]TimesStat, error) {
 	}
 
 	return []TimesStat{c}, nil
-
 }

cpu/cpu_darwin_nocgo.go

@@ -1,5 +1,5 @@
-// +build darwin
-// +build !cgo
+//go:build darwin && !cgo
+// +build darwin,!cgo
 
 package cpu
 

cpu/cpu_dragonfly.go

@@ -15,14 +15,16 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-var ClocksPerSec = float64(128)
-var cpuMatch = regexp.MustCompile(`^CPU:`)
-var originMatch = regexp.MustCompile(`Origin\s*=\s*"(.+)"\s+Id\s*=\s*(.+)\s+Stepping\s*=\s*(.+)`)
-var featuresMatch = regexp.MustCompile(`Features=.+<(.+)>`)
-var featuresMatch2 = regexp.MustCompile(`Features2=[a-f\dx]+<(.+)>`)
-var cpuEnd = regexp.MustCompile(`^Trying to mount root`)
-var cpuTimesSize int
-var emptyTimes cpuTimes
+var (
+	ClocksPerSec   = float64(128)
+	cpuMatch       = regexp.MustCompile(`^CPU:`)
+	originMatch    = regexp.MustCompile(`Origin\s*=\s*"(.+)"\s+Id\s*=\s*(.+)\s+Stepping\s*=\s*(.+)`)
+	featuresMatch  = regexp.MustCompile(`Features=.+<(.+)>`)
+	featuresMatch2 = regexp.MustCompile(`Features2=[a-f\dx]+<(.+)>`)
+	cpuEnd         = regexp.MustCompile(`^Trying to mount root`)
+	cpuTimesSize   int
+	emptyTimes     cpuTimes
+)
 
 func init() {
 	clkTck, err := sysconf.Sysconf(sysconf.SC_CLK_TCK)

cpu/cpu_fallback.go

@@ -1,3 +1,4 @@
+//go:build !darwin && !linux && !freebsd && !openbsd && !solaris && !windows && !dragonfly && !plan9 && !aix
 // +build !darwin,!linux,!freebsd,!openbsd,!solaris,!windows,!dragonfly,!plan9,!aix
 
 package cpu

cpu/cpu_freebsd.go

@@ -15,15 +15,17 @@ import (
 	"golang.org/x/sys/unix"
 )
 
-var ClocksPerSec = float64(128)
-var cpuMatch = regexp.MustCompile(`^CPU:`)
-var originMatch = regexp.MustCompile(`Origin\s*=\s*"(.+)"\s+Id\s*=\s*(.+)\s+Family\s*=\s*(.+)\s+Model\s*=\s*(.+)\s+Stepping\s*=\s*(.+)`)
-var featuresMatch = regexp.MustCompile(`Features=.+<(.+)>`)
-var featuresMatch2 = regexp.MustCompile(`Features2=[a-f\dx]+<(.+)>`)
-var cpuEnd = regexp.MustCompile(`^Trying to mount root`)
-var cpuCores = regexp.MustCompile(`FreeBSD/SMP: (\d*) package\(s\) x (\d*) core\(s\)`)
-var cpuTimesSize int
-var emptyTimes cpuTimes
+var (
+	ClocksPerSec   = float64(128)
+	cpuMatch       = regexp.MustCompile(`^CPU:`)
+	originMatch    = regexp.MustCompile(`Origin\s*=\s*"(.+)"\s+Id\s*=\s*(.+)\s+Family\s*=\s*(.+)\s+Model\s*=\s*(.+)\s+Stepping\s*=\s*(.+)`)
+	featuresMatch  = regexp.MustCompile(`Features=.+<(.+)>`)
+	featuresMatch2 = regexp.MustCompile(`Features2=[a-f\dx]+<(.+)>`)
+	cpuEnd         = regexp.MustCompile(`^Trying to mount root`)
+	cpuCores       = regexp.MustCompile(`FreeBSD/SMP: (\d*) package\(s\) x (\d*) core\(s\)`)
+	cpuTimesSize   int
+	emptyTimes     cpuTimes
+)
 
 func init() {
 	clkTck, err := sysconf.Sysconf(sysconf.SC_CLK_TCK)

cpu/cpu_freebsd_test.go

@@ -13,7 +13,7 @@ func TestParseDmesgBoot(t *testing.T) {
 		t.SkipNow()
 	}
 
-	var cpuTests = []struct {
+	cpuTests := []struct {
 		file   string
 		cpuNum int
 		cores  int32

cpu/cpu_linux.go

@@ -1,3 +1,4 @@
+//go:build linux
 // +build linux
 
 package cpu
@@ -30,7 +31,7 @@ func Times(percpu bool) ([]TimesStat, error) {
 
 func TimesWithContext(ctx context.Context, percpu bool) ([]TimesStat, error) {
 	filename := common.HostProc("stat")
-	var lines = []string{}
+	lines := []string{}
 	if percpu {
 		statlines, err := common.ReadLines(filename)
 		if err != nil || len(statlines) < 2 {
@@ -63,7 +64,7 @@ func sysCPUPath(cpu int32, relPath string) string {
 	return common.HostSys(fmt.Sprintf("devices/system/cpu/cpu%d", cpu), relPath)
 }
 
-func finishCPUInfo(c *InfoStat) error {
+func finishCPUInfo(c *InfoStat) {
 	var lines []string
 	var err error
 	var value float64
@@ -82,17 +83,16 @@ func finishCPUInfo(c *InfoStat) error {
 	// if we encounter errors below such as there are no cpuinfo_max_freq file,
 	// we just ignore. so let Mhz is 0.
 	if err != nil || len(lines) == 0 {
-		return nil
+		return
 	}
 	value, err = strconv.ParseFloat(lines[0], 64)
 	if err != nil {
-		return nil
+		return
 	}
 	c.Mhz = value / 1000.0 // value is in kHz
 	if c.Mhz > 9999 {
 		c.Mhz = c.Mhz / 1000.0 // value in Hz
 	}
-	return nil
 }
 
 // CPUInfo on linux will return 1 item per physical thread.
@@ -127,10 +127,7 @@ func InfoWithContext(ctx context.Context) ([]InfoStat, error) {
 			processorName = value
 		case "processor":
 			if c.CPU >= 0 {
-				err := finishCPUInfo(&c)
-				if err != nil {
-					return ret, err
-				}
+				finishCPUInfo(&c)
 				ret = append(ret, c)
 			}
 			c = InfoStat{Cores: 1, ModelName: processorName}
@@ -224,10 +221,7 @@ func InfoWithContext(ctx context.Context) ([]InfoStat, error) {
 		}
 	}
 	if c.CPU >= 0 {
-		err := finishCPUInfo(&c)
-		if err != nil {
-			return ret, err
-		}
+		finishCPUInfo(&c)
 		ret = append(ret, c)
 	}
 	return ret, nil
@@ -345,7 +339,7 @@ func CountsWithContext(ctx context.Context, logical bool) (int, error) {
 	}
 	// physical cores
 	// https://github.com/giampaolo/psutil/blob/8415355c8badc9c94418b19bdf26e622f06f0cce/psutil/_pslinux.py#L615-L628
-	var threadSiblingsLists = make(map[string]bool)
+	threadSiblingsLists := make(map[string]bool)
 	// These 2 files are the same but */core_cpus_list is newer while */thread_siblings_list is deprecated and may disappear in the future.
 	// https://www.kernel.org/doc/Documentation/admin-guide/cputopology.rst
 	// https://github.com/giampaolo/psutil/pull/1727#issuecomment-707624964

cpu/cpu_openbsd.go

@@ -1,3 +1,4 @@
+//go:build openbsd
 // +build openbsd
 
 package cpu
@@ -108,7 +109,7 @@ func TimesWithContext(ctx context.Context, percpu bool) ([]TimesStat, error) {
 			j *= 2
 		}
 
-		var cpuTimes = make([]int32, cpUStates)
+		cpuTimes := make([]int32, cpUStates)
 		var mib []int32
 		if percpu {
 			mib = []int32{ctlKern, kernCptime2, int32(j)}

cpu/cpu_plan9.go

@@ -1,3 +1,4 @@
+//go:build plan9
 // +build plan9
 
 package cpu

cpu/cpu_plan9_test.go

@@ -1,3 +1,4 @@
+//go:build plan9
 // +build plan9
 
 package cpu

cpu/cpu_solaris.go

@@ -24,7 +24,7 @@ func init() {
 	}
 }
 
-//sum all values in a float64 map with float64 keys
+// sum all values in a float64 map with float64 keys
 func msum(x map[float64]float64) float64 {
 	total := 0.0
 	for _, y := range x {
@@ -47,7 +47,7 @@ func TimesWithContext(ctx context.Context, percpu bool) ([]TimesStat, error) {
 	user := make(map[float64]float64)
 	kern := make(map[float64]float64)
 	iowt := make(map[float64]float64)
-	//swap := make(map[float64]float64)
+	// swap := make(map[float64]float64)
 	kstatSysOut, err := invoke.CommandWithContext(ctx, kstatSys, "-p", "cpu_stat:*:*:/^idle$|^user$|^kernel$|^iowait$|^swap$/")
 	if err != nil {
 		return nil, fmt.Errorf("cannot execute kstat: %s", err)

cpu/cpu_solaris_test.go

@@ -15,28 +15,36 @@ func TestParseISAInfo(t *testing.T) {
 	}{
 		{
 			"1cpu_1core_isainfo.txt",
-			[]string{"rdseed", "adx", "avx2", "fma", "bmi2", "bmi1", "rdrand", "f16c", "vmx",
+			[]string{
+				"rdseed", "adx", "avx2", "fma", "bmi2", "bmi1", "rdrand", "f16c", "vmx",
 				"avx", "xsave", "pclmulqdq", "aes", "movbe", "sse4.2", "sse4.1", "ssse3", "popcnt",
 				"tscp", "cx16", "sse3", "sse2", "sse", "fxsr", "mmx", "cmov", "amd_sysc", "cx8",
-				"tsc", "fpu"},
+				"tsc", "fpu",
+			},
 		},
 		{
 			"2cpu_1core_isainfo.txt",
-			[]string{"rdseed", "adx", "avx2", "fma", "bmi2", "bmi1", "rdrand", "f16c", "vmx",
+			[]string{
+				"rdseed", "adx", "avx2", "fma", "bmi2", "bmi1", "rdrand", "f16c", "vmx",
 				"avx", "xsave", "pclmulqdq", "aes", "movbe", "sse4.2", "sse4.1", "ssse3", "popcnt",
 				"tscp", "cx16", "sse3", "sse2", "sse", "fxsr", "mmx", "cmov", "amd_sysc", "cx8",
-				"tsc", "fpu"},
+				"tsc", "fpu",
+			},
 		},
 		{
 			"2cpu_8core_isainfo.txt",
-			[]string{"vmx", "avx", "xsave", "pclmulqdq", "aes", "sse4.2", "sse4.1", "ssse3", "popcnt",
+			[]string{
+				"vmx", "avx", "xsave", "pclmulqdq", "aes", "sse4.2", "sse4.1", "ssse3", "popcnt",
 				"tscp", "cx16", "sse3", "sse2", "sse", "fxsr", "mmx", "cmov", "amd_sysc", "cx8",
-				"tsc", "fpu"},
+				"tsc", "fpu",
+			},
 		},
 		{
 			"2cpu_12core_isainfo.txt",
-			[]string{"amd_svm", "amd_lzcnt", "popcnt", "amd_sse4a", "tscp", "ahf", "cx16", "sse3", "sse2",
-				"sse", "fxsr", "amd_3dnowx", "amd_3dnow", "amd_mmx", "mmx", "cmov", "amd_sysc", "cx8", "tsc", "fpu"},
+			[]string{
+				"amd_svm", "amd_lzcnt", "popcnt", "amd_sse4a", "tscp", "ahf", "cx16", "sse3", "sse2",
+				"sse", "fxsr", "amd_3dnowx", "amd_3dnow", "amd_mmx", "mmx", "cmov", "amd_sysc", "cx8", "tsc", "fpu",
+			},
 		},
 	}