Improve build

- inject git information into binary
- add lint

Signed-off-by: Markus Blaschke <[email protected]>

Author: mblaschke

Dockerfile

@@ -9,15 +9,14 @@ RUN go mod download
 
 # Compile
 COPY ./ /go/src/github.com/webdevops/azure-scheduledevents-exporter
-RUN go mod download \
-    && CGO_ENABLED=0 GOOS=linux go build -a -ldflags '-extldflags "-static"' -o /azure-scheduledevents-exporter \
-    && chmod +x /azure-scheduledevents-exporter
-RUN /azure-scheduledevents-exporter --help
+RUN make lint
+RUN make build
+RUN ./azure-scheduledevents-exporter --help
 
 #############################################
 # FINAL IMAGE
 #############################################
 FROM gcr.io/distroless/static
-COPY --from=build /azure-scheduledevents-exporter /
+COPY --from=build /go/src/github.com/webdevops/azure-scheduledevents-exporter/azure-scheduledevents-exporter /
 USER 1000
 ENTRYPOINT ["/azure-scheduledevents-exporter"]

Makefile

@@ -0,0 +1,39 @@
+.PHONY: all build clean image check vendor dependencies
+
+NAME				:= azure-scheduledevents-exporter
+GIT_TAG				:= $(shell git describe --dirty --tags --always)
+GIT_COMMIT			:= $(shell git rev-parse --short HEAD)
+LDFLAGS             := -X "main.gitTag=$(GIT_TAG)" -X "main.gitCommit=$(GIT_COMMIT)" -extldflags "-static"
+
+PKGS				:= $(shell go list ./... | grep -v -E '/vendor/|/test')
+FIRST_GOPATH		:= $(firstword $(subst :, ,$(shell go env GOPATH)))
+GOLANGCI_LINT_BIN	:= $(FIRST_GOPATH)/bin/golangci-lint
+
+
+all: build
+
+clean:
+	git clean -Xfd .
+
+build:
+	CGO_ENABLED=0 go build -a -ldflags '$(LDFLAGS)' -o $(NAME) .
+
+vendor:
+	go mod tidy
+	go mod vendor
+	go mod verify
+
+image: build
+	docker build -t $(NAME):$(TAG) .
+
+.PHONY: lint
+lint: $(GOLANGCI_LINT_BIN)
+	# megacheck fails to respect build flags, causing compilation failure during linting.
+	# instead, use the unused, gosimple, and staticcheck linters directly
+	$(GOLANGCI_LINT_BIN) run -D megacheck -E unused,gosimple,staticcheck --timeout=10m
+
+dependencies: $(GOLANGCI_LINT_BIN)
+
+$(GOLANGCI_LINT_BIN):
+	curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(FIRST_GOPATH)/bin v1.23.8
+

README.md

@@ -18,15 +18,27 @@ Configuration
 
 Normally no configuration is needed but can be customized using environment variables.
 
-| Environment variable   | DefaultValue                                                              | Description                                                       |
-|------------------------|---------------------------------------------------------------------------|-------------------------------------------------------------------|
-| `API_URL`              | `http://169.254.169.254/metadata/scheduledevents?api-version=2017-08-01`  | Azure API url                                                     |
-| `API_TIMEOUT`          | `30s` (time.Duration)                                                     | API call timeout                                                  |
-| `API_ERROR_THRESHOLD`  | `0` (disabled)                                                            | API error threshold after which app will panic (`0` = dislabed)   |
-| `SCRAPE_TIME`          | `1m` (time.Duration)                                                      | Time between API calls                                            |
-| `SERVER_BIND`          | `:8080`                                                                   | IP/Port binding                                                   |
-| `METRICS_REQUESTSTATS` | `empty`                                                                   | Enable metric `azure_scheduledevent_request`                      |
+```
+Usage:
+  azure-scheduledevents-exporter [OPTIONS]
+
+Application Options:
+      --bind=                 Server address (default: :8080) [$SERVER_BIND]
+      --scrape-time=          Scrape time in seconds (default: 1m)
+                              [$SCRAPE_TIME]
+  -v, --verbose               Verbose mode [$VERBOSE]
+      --api-url=              Azure ScheduledEvents API URL (default:
+                              http://169.254.169.254/metadata/scheduledevents?api-version=2017-11-01) [$API_URL]
+      --api-timeout=          Azure API timeout (seconds) (default: 30s)
+                              [$API_TIMEOUT]
+      --api-error-threshold=  Azure API error threshold (after which app will
+                              panic) (default: 0) [$API_ERROR_THRESHOLD]
+      --metrics-requeststats  Enable request stats metrics
+                              [$METRICS_REQUESTSTATS]
 
+Help Options:
+  -h, --help                  Show this help message
+```
 
 Metrics
 -------

go.mod

@@ -3,7 +3,6 @@ module github.com/webdevops/azure-scheduledevents-exporter
 go 1.13
 
 require (
-	github.com/cespare/xxhash/v2 v2.1.1 // indirect
 	github.com/golang/protobuf v1.3.4 // indirect
 	github.com/jessevdk/go-flags v1.4.1-0.20181221193153-c0795c8afcf4
 	github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369 // indirect

go.sum

@@ -7,8 +7,6 @@ github.com/beorn7/perks v1.0.0 h1:HWo1m869IqiPhD389kmkxeTalrjNbbJTC8LXupb+sl0=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
-github.com/cespare/xxhash/v2 v2.1.0 h1:yTUvW7Vhb89inJ+8irsUqiWjh8iT6sQPZiQzI6ReGkA=
-github.com/cespare/xxhash/v2 v2.1.0/go.mod h1:dgIUBU3pDso/gPgZ1osOZ0iQf77oPR28Tjxl5dIMyVM=
 github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY=
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -22,19 +20,16 @@ github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7a
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/golang/protobuf v1.3.3-0.20190827175835-822fe56949f5 h1:cPceVGuQtfj7nbUwDCVWus7qo91whQv/nWUCNnSjBlc=
-github.com/golang/protobuf v1.3.3-0.20190827175835-822fe56949f5/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw=
 github.com/golang/protobuf v1.3.4 h1:87PNWwrRvUSnqS4dlcBU/ftvOIBep4sYuBLlh6rX2wk=
 github.com/golang/protobuf v1.3.4/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw=
-github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1 h1:Xye71clBPdm5HgqGwUkwhbynsUJZhDbS20FvLhQ2izg=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/google/go-cmp v0.4.0 h1:xsAVV57WRhGj6kEIi8ReJzQlHHqcBYCElAvkovg3B/4=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/jessevdk/go-flags v1.4.1-0.20181221193153-c0795c8afcf4 h1:xKkUL6QBojwguhKKetf1SocCAKqc6W7S/mGm9xEGllo=
 github.com/jessevdk/go-flags v1.4.1-0.20181221193153-c0795c8afcf4/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
-github.com/json-iterator/go v1.1.7/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
 github.com/json-iterator/go v1.1.9/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
 github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
@@ -55,27 +50,19 @@ github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=
 github.com/prometheus/client_golang v1.0.0/go.mod h1:db9x61etRT2tGnBNRi70OPL5FsnadC4Ky3P0J6CfImo=
-github.com/prometheus/client_golang v1.2.1 h1:JnMpQc6ppsNgw9QPAGF6Dod479itz7lvlsMzzNayLOI=
-github.com/prometheus/client_golang v1.2.1/go.mod h1:XMU6Z2MjaRKVu/dC1qupJI9SiNkDYzz3xecMgSW/F+U=
 github.com/prometheus/client_golang v1.4.1 h1:FFSuS004yOQEtDdTq+TAOLP5xUq63KqAFYyOi8zA+Y8=
 github.com/prometheus/client_golang v1.4.1/go.mod h1:e9GMxYsXl05ICDXkRhurwBS4Q3OK1iX/F2sw+iXX5zU=
 github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
 github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90 h1:S/YWwWx/RA8rT8tKFRuGUZhuA90OyIBpPCXkcbwU8DE=
 github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
-github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
-github.com/prometheus/client_model v0.0.0-20191202183732-d1d2010b5bee h1:iBZPTYkGLvdu6+A5TsMUJQkQX9Ad4aCEnSQtdxPuTCQ=
-github.com/prometheus/client_model v0.0.0-20191202183732-d1d2010b5bee/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/prometheus/client_model v0.2.0 h1:uq5h0d+GuxiXLJLNABMgp2qUWDPiLvgCzz2dUR+/W/M=
 github.com/prometheus/client_model v0.2.0/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/prometheus/common v0.4.1 h1:K0MGApIoQvMw27RTdJkPbr3JZ7DNbtxQNyi5STVM6Kw=
 github.com/prometheus/common v0.4.1/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
-github.com/prometheus/common v0.7.0 h1:L+1lyG48J1zAQXA3RBX/nG/B3gjlHq0zTt2tlbJLyCY=
-github.com/prometheus/common v0.7.0/go.mod h1:DjGbpBbp5NYNiECxcL/VnbXCCaQpKd3tt26CguLLsqA=
 github.com/prometheus/common v0.9.1 h1:KOMtN28tlbam3/7ZKEYKHhKoJZYYj3gMH4uc62x7X7U=
 github.com/prometheus/common v0.9.1/go.mod h1:yhUN8i9wzaXS3w1O07YhxHEBxD+W35wd8bs7vj7HSQ4=
 github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
 github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
-github.com/prometheus/procfs v0.0.5/go.mod h1:4A/X28fw3Fc593LaREMrKMqOKvUAntwMDaekg4FpcdQ=
 github.com/prometheus/procfs v0.0.8 h1:+fpWZdT24pJBiqJdAwYBjPSk+5YmQzYNPYzQsdzLkt8=
 github.com/prometheus/procfs v0.0.8/go.mod h1:7Qr8sr6344vo1JqZ6HhLceV9o3AJ1Ff+GxbHq6oeK9A=
 github.com/prometheus/procfs v0.0.10 h1:QJQN3jYQhkamO4mhfUWqdDH2asK7ONOI9MTWjyAxNKM=
@@ -98,13 +85,11 @@ golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20191010194322-b09406accb47/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e h1:9vRrk9YW2BTzLP0VCB9ZDjU4cPqkg+IDWL7XgxA1yxQ=
-golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200122134326-e047566fdf82/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae h1:/WDfKMnPU+m5M4xB+6x4kaepxRw6jWvR5iDRdvjHgy8=
 golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

main.go

@@ -10,15 +10,17 @@ import (
 )
 
 const (
-	Author  = "webdevops.io"
-	Version = "1.8.0"
+	Author = "webdevops.io"
 )
 
 var (
 	argparser   *flags.Parser
-	args        []string
 	Logger      *DaemonLogger
 	ErrorLogger *DaemonLogger
+
+	// Git version information
+	gitCommit = "<unknown>"
+	gitTag    = "<unknown>"
 )
 
 var opts struct {
@@ -46,7 +48,7 @@ func main() {
 	// set verbosity
 	Verbose = len(opts.Verbose) >= 1
 
-	Logger.Messsage("Init Azure ScheduledEvents exporter v%s (written by %v)", Version, Author)
+	Logger.Messsage("Init Azure ScheduledEvents exporter v%s (%s; by %v)", gitTag, gitCommit, Author)
 
 	Logger.Messsage("Starting metrics collection")
 	Logger.Messsage("  API URL: %v", opts.ApiUrl)