Cleanup linting issues

* Remove unused linting settings from golangci-lint config.
* Fixup linting issues.

Signed-off-by: SuperQ <superq@gmail.com>

Author: SuperQ

.golangci.yml

@@ -30,19 +30,11 @@ linters:
       - common-false-positives
       - legacy
       - std-error-handling
-    paths:
-      - third_party$
-      - builtin$
-      - examples$
     rules:
       - linters:
           - errcheck
         # Taken from the default exclusions in v1.
         text: Error return value of .((os\.)?std(out|err)\..*|.*Close|.*Flush|os\.Remove(All)?|.*print(f|ln)?|os\.(Un)?Setenv). is not checked
-      - linters:
-          - govet
-        # We use many Seek methods that do not follow the usual pattern.
-        text: "stdmethods: method Seek.* should have signature Seek"
       - linters:
           - revive
         # We have stopped at some point to write doc comments on exported symbols.
@@ -51,15 +43,6 @@ linters:
       - linters:
           - gocritic
         text: "appendAssign"
-      - linters:
-          - errcheck
-        path: _test.go
-      - linters:
-          - errorlint
-        path: "tsdb/head_wal.go"
-      - linters:
-          - godot
-        source: "^// ==="
     warn-unused: true
   settings:
     depguard:
@@ -182,7 +165,3 @@ formatters:
         - github.com/prometheus/common
   exclusions:
     generated: lax
-    paths:
-      - third_party$
-      - builtin$
-      - examples$

config/http_config.go

@@ -1508,19 +1508,19 @@ func (c *ProxyConfig) Proxy() (fn func(*http.Request) (*url.URL, error)) {
 		fn = c.proxyFunc
 	}()
 	if c.proxyFunc != nil {
-		return
+		return fn
 	}
 	if c.ProxyFromEnvironment {
 		proxyFn := httpproxy.FromEnvironment().ProxyFunc()
 		c.proxyFunc = func(req *http.Request) (*url.URL, error) {
 			return proxyFn(req.URL)
 		}
-		return
+		return fn
 	}
 	if c.ProxyURL.URL != nil && c.ProxyURL.String() != "" {
 		if c.NoProxy == "" {
 			c.proxyFunc = http.ProxyURL(c.ProxyURL.URL)
-			return
+			return fn
 		}
 		proxy := &httpproxy.Config{
 			HTTPProxy:  c.ProxyURL.String(),
@@ -1532,7 +1532,7 @@ func (c *ProxyConfig) Proxy() (fn func(*http.Request) (*url.URL, error)) {
 			return proxyFn(req.URL)
 		}
 	}
-	return
+	return fn
 }
 
 // ProxyConnectHeader() return the Proxy Connext Headers.

config/http_config_test.go

@@ -1977,7 +1977,7 @@ func TestTLSRoundTripper_NoCAConfigured(t *testing.T) {
 	defer os.RemoveAll(tmpDir)
 	cert, key := filepath.Join(tmpDir, "cert"), filepath.Join(tmpDir, "key")
 
-	handler := func(w http.ResponseWriter, r *http.Request) {
+	handler := func(w http.ResponseWriter, _ *http.Request) {
 		fmt.Fprint(w, ExpectedMessage)
 	}
 	testServer, err := newTestServer(handler)

expfmt/openmetrics_create.go

@@ -160,38 +160,38 @@ func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily, options ...E
 		n, err = w.WriteString("# HELP ")
 		written += n
 		if err != nil {
-			return
+			return written, err
 		}
 		n, err = writeName(w, compliantName)
 		written += n
 		if err != nil {
-			return
+			return written, err
 		}
 		err = w.WriteByte(' ')
 		written++
 		if err != nil {
-			return
+			return written, err
 		}
 		n, err = writeEscapedString(w, *in.Help, true)
 		written += n
 		if err != nil {
-			return
+			return written, err
 		}
 		err = w.WriteByte('\n')
 		written++
 		if err != nil {
-			return
+			return written, err
 		}
 	}
 	n, err = w.WriteString("# TYPE ")
 	written += n
 	if err != nil {
-		return
+		return written, err
 	}
 	n, err = writeName(w, compliantName)
 	written += n
 	if err != nil {
-		return
+		return written, err
 	}
 	switch metricType {
 	case dto.MetricType_COUNTER:
@@ -215,34 +215,34 @@ func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily, options ...E
 	}
 	written += n
 	if err != nil {
-		return
+		return written, err
 	}
 	if toOM.withUnit && in.Unit != nil {
 		n, err = w.WriteString("# UNIT ")
 		written += n
 		if err != nil {
-			return
+			return written, err
 		}
 		n, err = writeName(w, compliantName)
 		written += n
 		if err != nil {
-			return
+			return written, err
 		}
 
 		err = w.WriteByte(' ')
 		written++
 		if err != nil {
-			return
+			return written, err
 		}
 		n, err = writeEscapedString(w, *in.Unit, true)
 		written += n
 		if err != nil {
-			return
+			return written, err
 		}
 		err = w.WriteByte('\n')
 		written++
 		if err != nil {
-			return
+			return written, err
 		}
 	}
 
@@ -306,7 +306,7 @@ func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily, options ...E
 				)
 				written += n
 				if err != nil {
-					return
+					return written, err
 				}
 			}
 			n, err = writeOpenMetricsSample(
@@ -316,7 +316,7 @@ func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily, options ...E
 			)
 			written += n
 			if err != nil {
-				return
+				return written, err
 			}
 			n, err = writeOpenMetricsSample(
 				w, compliantName, "_count", metric, "", 0,
@@ -349,7 +349,7 @@ func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily, options ...E
 				)
 				written += n
 				if err != nil {
-					return
+					return written, err
 				}
 				if math.IsInf(b.GetUpperBound(), +1) {
 					infSeen = true
@@ -367,7 +367,7 @@ func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily, options ...E
 				// out if needed).
 				written += n
 				if err != nil {
-					return
+					return written, err
 				}
 			}
 			n, err = writeOpenMetricsSample(
@@ -377,7 +377,7 @@ func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily, options ...E
 			)
 			written += n
 			if err != nil {
-				return
+				return written, err
 			}
 			if metric.Histogram.GetSampleCountFloat() > 0 {
 				return written, fmt.Errorf(
@@ -401,10 +401,10 @@ func MetricFamilyToOpenMetrics(out io.Writer, in *dto.MetricFamily, options ...E
 		}
 		written += n
 		if err != nil {
-			return
+			return written, err
 		}
 	}
-	return
+	return written, err
 }
 
 // FinalizeOpenMetrics writes the final `# EOF\n` line required by OpenMetrics.

expfmt/text_create.go

@@ -108,38 +108,38 @@ func MetricFamilyToText(out io.Writer, in *dto.MetricFamily) (written int, err e
 		n, err = w.WriteString("# HELP ")
 		written += n
 		if err != nil {
-			return
+			return written, err
 		}
 		n, err = writeName(w, name)
 		written += n
 		if err != nil {
-			return
+			return written, err
 		}
 		err = w.WriteByte(' ')
 		written++
 		if err != nil {
-			return
+			return written, err
 		}
 		n, err = writeEscapedString(w, *in.Help, false)
 		written += n
 		if err != nil {
-			return
+			return written, err
 		}
 		err = w.WriteByte('\n')
 		written++
 		if err != nil {
-			return
+			return written, err
 		}
 	}
 	n, err = w.WriteString("# TYPE ")
 	written += n
 	if err != nil {
-		return
+		return written, err
 	}
 	n, err = writeName(w, name)
 	written += n
 	if err != nil {
-		return
+		return written, err
 	}
 	metricType := in.GetType()
 	switch metricType {
@@ -161,7 +161,7 @@ func MetricFamilyToText(out io.Writer, in *dto.MetricFamily) (written int, err e
 	}
 	written += n
 	if err != nil {
-		return
+		return written, err
 	}
 
 	// Finally the samples, one line for each.
@@ -211,7 +211,7 @@ func MetricFamilyToText(out io.Writer, in *dto.MetricFamily) (written int, err e
 				)
 				written += n
 				if err != nil {
-					return
+					return written, err
 				}
 			}
 			n, err = writeSample(
@@ -220,7 +220,7 @@ func MetricFamilyToText(out io.Writer, in *dto.MetricFamily) (written int, err e
 			)
 			written += n
 			if err != nil {
-				return
+				return written, err
 			}
 			n, err = writeSample(
 				w, name, "_count", metric, "", 0,
@@ -245,7 +245,7 @@ func MetricFamilyToText(out io.Writer, in *dto.MetricFamily) (written int, err e
 				)
 				written += n
 				if err != nil {
-					return
+					return written, err
 				}
 				if math.IsInf(b.GetUpperBound(), +1) {
 					infSeen = true
@@ -263,7 +263,7 @@ func MetricFamilyToText(out io.Writer, in *dto.MetricFamily) (written int, err e
 				)
 				written += n
 				if err != nil {
-					return
+					return written, err
 				}
 			}
 			n, err = writeSample(
@@ -272,7 +272,7 @@ func MetricFamilyToText(out io.Writer, in *dto.MetricFamily) (written int, err e
 			)
 			written += n
 			if err != nil {
-				return
+				return written, err
 			}
 			v := metric.Histogram.GetSampleCountFloat()
 			if v == 0 {
@@ -286,10 +286,10 @@ func MetricFamilyToText(out io.Writer, in *dto.MetricFamily) (written int, err e
 		}
 		written += n
 		if err != nil {
-			return
+			return written, err
 		}
 	}
-	return
+	return written, err
 }
 
 // writeSample writes a single sample in text format to w, given the metric