fixed error logging, insecure skip verify, go mod

Signed-off-by: Sean Porter <portertech@gmail.com>

.travis.yml

@@ -1,6 +1,6 @@
 language: go
 go:
-- 1.10.x
+- 1.13.x
 install:
 - go get gopkg.in/alecthomas/gometalinter.v1
 - go get github.com/gordonklaus/ineffassign

go.mod

@@ -0,0 +1,18 @@
+module github.com/sensu/sensu-prometheus-collector
+
+go 1.13
+
+require (
+	github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973
+	github.com/davecgh/go-spew v1.1.1
+	github.com/golang/protobuf v1.2.0
+	github.com/kelseyhightower/envconfig v1.3.0
+	github.com/matttproud/golang_protobuf_extensions v1.0.1
+	github.com/pmezard/go-difflib v1.0.0
+	github.com/prometheus/client_golang v0.8.0
+	github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910
+	github.com/prometheus/common v0.0.0-20181126121408-4724e9255275
+	github.com/prometheus/procfs v0.0.0-20181204211112-1dc9a6cbc91a
+	github.com/stretchr/testify v1.2.2
+	golang.org/x/net v0.0.0-20181207154023-610586996380
+)

go.sum

@@ -0,0 +1,19 @@
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/kelseyhightower/envconfig v1.3.0 h1:IvRS4f2VcIQy6j4ORGIf9145T/AsUB+oY8LyvN8BXNM=
+github.com/kelseyhightower/envconfig v1.3.0/go.mod h1:cccZRl6mQpaq41TPp5QxidR+Sa3axMbJDNb//FQX6Gg=
+github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
+github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/prometheus/client_golang v0.8.0 h1:1921Yw9Gc3iSc4VQh3PIoOqgPCZS7G/4xQNVUp8Mda8=
+github.com/prometheus/client_golang v0.8.0/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=
+github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910 h1:idejC8f05m9MGOsuEi1ATq9shN03HrxNkD/luQvxCv8=
+github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
+github.com/prometheus/common v0.0.0-20181126121408-4724e9255275 h1:PnBWHBf+6L0jOqq0gIVUe6Yk0/QMZ640k6NvkxcBf+8=
+github.com/prometheus/common v0.0.0-20181126121408-4724e9255275/go.mod h1:daVV7qP5qjZbuso7PdcryaAu0sAZbrN9i7WWcTMWvro=
+github.com/prometheus/procfs v0.0.0-20181204211112-1dc9a6cbc91a/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
+golang.org/x/net v0.0.0-20181207154023-610586996380 h1:zPQexyRtNYBc7bcHmehl1dH6TB3qn8zytv8cBGLDNY0=
+golang.org/x/net v0.0.0-20181207154023-610586996380/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=

main.go

@@ -2,10 +2,12 @@ package main
 
 import (
 	"context"
+	"crypto/tls"
 	"encoding/json"
 	"errors"
 	"flag"
 	"fmt"
+	"log"
 	"net/http"
 	"os"
 	"strconv"
@@ -158,8 +160,11 @@ func QueryPrometheus(promURL string, queryString string) (model.Vector, error) {
 	return nil, errors.New("unexpected response type")
 }
 
-func QueryExporter(exporterURL string, auth ExporterAuth) (model.Vector, error) {
-	client := &http.Client{}
+func QueryExporter(exporterURL string, auth ExporterAuth, insecureSkipVerify bool) (model.Vector, error) {
+	tr := &http.Transport{
+		TLSClientConfig: &tls.Config{InsecureSkipVerify: insecureSkipVerify},
+	}
+	client := &http.Client{Transport: tr}
 	req, err := http.NewRequest("GET", exporterURL, nil)
 
 	if err != nil {
@@ -235,6 +240,7 @@ func main() {
 	queryString := flag.String("prom-query", "up", "Prometheus API query string.")
 	outputFormat := flag.String("output-format", "influx", "The check output format to use for metrics {influx|graphite|json}.")
 	metricPrefix := flag.String("metric-prefix", "", "Metric name prefix, only supported by line protocol output formats.")
+	insecureSkipVerify := flag.Bool("insecure-skip-verify", false, "Skip TLS peer verification.")
 	flag.Parse()
 
 	var samples model.Vector
@@ -244,30 +250,30 @@ func main() {
 		auth, err := setExporterAuth(*exporterUser, *exporterPassword, *exporterAuthorizationHeader)
 
 		if err != nil {
-			_ = fmt.Errorf("%v", err)
+			log.Fatal(err)
 			os.Exit(2)
 		}
 
-		samples, err = QueryExporter(*exporterURL, auth)
+		samples, err = QueryExporter(*exporterURL, auth, *insecureSkipVerify)
 
 		if err != nil {
-			_ = fmt.Errorf("%v", err)
+			log.Fatal(err)
 			os.Exit(2)
 		}
 
 	} else {
 		samples, err = QueryPrometheus(*promURL, *queryString)
 
 		if err != nil {
-			_ = fmt.Errorf("%v", err)
+			log.Fatal(err)
 			os.Exit(2)
 		}
 	}
 
 	err = OutputMetrics(samples, *outputFormat, *metricPrefix)
 
 	if err != nil {
-		_ = fmt.Errorf("%v", err)
+		_ = fmt.Errorf("error %v", err)
 		os.Exit(2)
 	}
 }