mint fixes for go1.14 (#10294)

add go.mod to ensure that mint can be
built with go1.14.x

mint/run/core/healthcheck/main.go

@@ -0,0 +1,219 @@
+/*
+*
+*  Mint, (C) 2019 Minio, Inc.
+*
+*  Licensed under the Apache License, Version 2.0 (the "License");
+*  you may not use this file except in compliance with the License.
+*  You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+*  Unless required by applicable law or agreed to in writing, software
+
+*  distributed under the License is distributed on an "AS IS" BASIS,
+*  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+*  See the License for the specific language governing permissions and
+*  limitations under the License.
+*
+ */
+
+package main
+
+import (
+	"crypto/tls"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+	"os"
+	"time"
+
+	jwtgo "github.com/dgrijalva/jwt-go"
+	log "github.com/sirupsen/logrus"
+)
+
+const (
+	pass           = "PASS" // Indicate that a test passed
+	fail           = "FAIL" // Indicate that a test failed
+	livenessPath   = "/minio/health/live"
+	readinessPath  = "/minio/health/ready"
+	prometheusPath = "/minio/prometheus/metrics"
+	timeout        = time.Duration(30 * time.Second)
+)
+
+type mintJSONFormatter struct {
+}
+
+func (f *mintJSONFormatter) Format(entry *log.Entry) ([]byte, error) {
+	data := make(log.Fields, len(entry.Data))
+	for k, v := range entry.Data {
+		switch v := v.(type) {
+		case error:
+			// Otherwise errors are ignored by `encoding/json`
+			// https://github.com/sirupsen/logrus/issues/137
+			data[k] = v.Error()
+		default:
+			data[k] = v
+		}
+	}
+
+	serialized, err := json.Marshal(data)
+	if err != nil {
+		return nil, fmt.Errorf("Failed to marshal fields to JSON, %w", err)
+	}
+	return append(serialized, '\n'), nil
+}
+
+// log successful test runs
+func successLogger(function string, args map[string]interface{}, startTime time.Time) *log.Entry {
+	// calculate the test case duration
+	duration := time.Since(startTime)
+	// log with the fields as per mint
+	fields := log.Fields{"name": "healthcheck", "function": function, "args": args, "duration": duration.Nanoseconds() / 1000000, "status": pass}
+	return log.WithFields(fields)
+}
+
+// log failed test runs
+func failureLog(function string, args map[string]interface{}, startTime time.Time, alert string, message string, err error) *log.Entry {
+	// calculate the test case duration
+	duration := time.Since(startTime)
+	var fields log.Fields
+	// log with the fields as per mint
+	if err != nil {
+		fields = log.Fields{"name": "healthcheck", "function": function, "args": args,
+			"duration": duration.Nanoseconds() / 1000000, "status": fail, "alert": alert, "message": message, "error": err}
+	} else {
+		fields = log.Fields{"name": "healthcheck", "function": function, "args": args,
+			"duration": duration.Nanoseconds() / 1000000, "status": fail, "alert": alert, "message": message}
+	}
+	return log.WithFields(fields)
+}
+
+func testLivenessEndpoint(endpoint string) {
+	startTime := time.Now()
+	function := "testLivenessEndpoint"
+
+	u, err := url.Parse(fmt.Sprintf("%s%s", endpoint, livenessPath))
+	if err != nil {
+		// Could not parse URL successfully
+		failureLog(function, nil, startTime, "", "URL Parsing for Healthcheck Liveness handler failed", err).Fatal()
+	}
+
+	tr := &http.Transport{
+		TLSClientConfig: &tls.Config{InsecureSkipVerify: u.Scheme == "https"},
+	}
+	client := &http.Client{Transport: tr, Timeout: timeout}
+	resp, err := client.Get(u.String())
+	if err != nil {
+		// GET request errored
+		failureLog(function, nil, startTime, "", "GET request failed", err).Fatal()
+	}
+	if resp.StatusCode != http.StatusOK {
+		// Status not 200 OK
+		failureLog(function, nil, startTime, "", fmt.Sprintf("GET /minio/health/live returned %s", resp.Status), err).Fatal()
+	}
+
+	defer resp.Body.Close()
+	defer successLogger(function, nil, startTime).Info()
+}
+
+func testReadinessEndpoint(endpoint string) {
+	startTime := time.Now()
+	function := "testReadinessEndpoint"
+
+	u, err := url.Parse(fmt.Sprintf("%s%s", endpoint, readinessPath))
+	if err != nil {
+		// Could not parse URL successfully
+		failureLog(function, nil, startTime, "", "URL Parsing for Healthcheck Readiness handler failed", err).Fatal()
+	}
+
+	tr := &http.Transport{
+		TLSClientConfig: &tls.Config{InsecureSkipVerify: u.Scheme == "https"},
+	}
+	client := &http.Client{Transport: tr, Timeout: timeout}
+	resp, err := client.Get(u.String())
+	if err != nil {
+		// GET request errored
+		failureLog(function, nil, startTime, "", "GET request to Readiness endpoint failed", err).Fatal()
+	}
+	if resp.StatusCode != http.StatusOK {
+		// Status not 200 OK
+		failureLog(function, nil, startTime, "", "GET /minio/health/ready returned non OK status", err).Fatal()
+	}
+
+	defer resp.Body.Close()
+	defer successLogger(function, nil, startTime).Info()
+}
+
+const (
+	defaultPrometheusJWTExpiry = 100 * 365 * 24 * time.Hour
+)
+
+func testPrometheusEndpoint(endpoint string) {
+	startTime := time.Now()
+	function := "testPrometheusEndpoint"
+
+	u, err := url.Parse(fmt.Sprintf("%s%s", endpoint, prometheusPath))
+	if err != nil {
+		// Could not parse URL successfully
+		failureLog(function, nil, startTime, "", "URL Parsing for Healthcheck Prometheus handler failed", err).Fatal()
+	}
+
+	jwt := jwtgo.NewWithClaims(jwtgo.SigningMethodHS512, jwtgo.StandardClaims{
+		ExpiresAt: time.Now().UTC().Add(defaultPrometheusJWTExpiry).Unix(),
+		Subject:   os.Getenv("ACCESS_KEY"),
+		Issuer:    "prometheus",
+	})
+
+	token, err := jwt.SignedString([]byte(os.Getenv("SECRET_KEY")))
+	if err != nil {
+		failureLog(function, nil, startTime, "", "jwt generation failed", err).Fatal()
+	}
+
+	tr := &http.Transport{
+		TLSClientConfig: &tls.Config{InsecureSkipVerify: u.Scheme == "https"},
+	}
+	client := &http.Client{Transport: tr, Timeout: timeout}
+
+	req, err := http.NewRequest(http.MethodGet, u.String(), nil)
+	if err != nil {
+		failureLog(function, nil, startTime, "", "Initializing GET request to Prometheus endpoint failed", err).Fatal()
+	}
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token))
+
+	resp, err := client.Do(req)
+	if err != nil {
+		// GET request errored
+		failureLog(function, nil, startTime, "", "GET request to Prometheus endpoint failed", err).Fatal()
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		// Status not 200 OK
+		failureLog(function, nil, startTime, "", "GET /minio/prometheus/metrics returned non OK status", err).Fatal()
+	}
+
+	defer resp.Body.Close()
+	defer successLogger(function, nil, startTime).Info()
+}
+
+func main() {
+	endpoint := os.Getenv("SERVER_ENDPOINT")
+	secure := os.Getenv("ENABLE_HTTPS")
+	endpoint = "http://" + endpoint
+	if secure == "1" {
+		endpoint = "https://" + endpoint
+	}
+
+	// Output to stdout instead of the default stderr
+	log.SetOutput(os.Stdout)
+	// create custom formatter
+	mintFormatter := mintJSONFormatter{}
+	// set custom formatter
+	log.SetFormatter(&mintFormatter)
+	// log Info or above -- success cases are Info level, failures are Fatal level
+	log.SetLevel(log.InfoLevel)
+	// execute tests
+	testLivenessEndpoint(endpoint)
+	testReadinessEndpoint(endpoint)
+	testPrometheusEndpoint(endpoint)
+}