Merge pull request #5 from peschmae/feature/merge-kully

Feature/merge kully

.github/workflows/go.yml

@@ -12,13 +12,19 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Set up Go
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v3
       with:
         go-version: 1.17
 
+    - name: install stringer
+      run: go install golang.org/x/tools/cmd/stringer@latest
+
+    - name: Generate
+      run: go generate ./...
+
     - name: Build
       run: go build -v ./...
 

.gitignore

@@ -1,5 +1,6 @@
 mystrom-exporter
 output/*
+*_string.go
 
 # Created by https://www.toptal.com/developers/gitignore/api/osx,intellij+all,windows
 # Edit at https://www.toptal.com/developers/gitignore?templates=osx,intellij+all,windows
@@ -148,4 +149,4 @@ $RECYCLE.BIN/
 # Windows shortcuts
 *.lnk
 
-# End of https://www.toptal.com/developers/gitignore/api/osx,intellij+all,windows
+# End of https://www.toptal.com/developers/gitignore/api/osx,intellij+all,windows

Dockerfile

@@ -2,7 +2,7 @@ FROM golang:alpine as build
 
 WORKDIR /root
 COPY . /root
-RUN go build .
+RUN go install golang.org/x/tools/cmd/stringer@latest && go generate ./... && go build .
 
 FROM alpine:latest
 

Makefile

@@ -1,13 +1,56 @@
-.PHONY: clean run
+##
+#
+.DEFAULT_GOAL := help
+.PHONY: generate go-tools
 
-linux:
+version    := $(shell git describe --tags --always)
-	GOOS=linux GOARCH=amd64 go build -o output/mystrom-exporter_linux-amd64
+revision   := $(shell git rev-parse HEAD)
-mac:
+branch     := $(shell git rev-parse --abbrev-ref HEAD)
-	GOOS=darwin GOARCH=amd64 go build -o output/mystrom-exporter_mac-amd64
+builduser  := $(shell whoami)
-arm64:
+builddate  := $(shell date '+%FT%T_%Z')
-	GOOS=linux GOARCH=arm64 go build -o output/mystrom-exporter_linux-arm64
+
-arm:
+versionPkgPrefix := mystrom-exporter/pkg/version
-	GOOS=linux GOARCH=arm go build -o output/mystrom-exporter_linux-arm
+
+BINDIR    := $(CURDIR)/output
+GO        ?= go
+GOPATH    ?= $(shell $(GO) env GOPATH)
+LDFLAGS   := -w -s \
+	-X $(versionPkgPrefix).Version=${version} \
+	-X $(versionPkgPrefix).Revision=${revision} \
+	-X $(versionPkgPrefix).Branch=${branch} \
+	-X $(versionPkgPrefix).BuildUser=${builduser} \
+	-X $(versionPkgPrefix).BuildDate=${builddate}
+GOFLAGS   := -v
+GOX_FLAGS          := -mod=vendor
+GO_BUILD_FLAGS     := -v
+export GO111MODULE := on
+
+build: go-tools generate ## builds the all platform binaries of the exporter
+	$(GOPATH)/bin/gox \
+			-os="darwin linux" \
+			-arch="amd64 arm arm64" \
+			-osarch="!darwin/arm" \
+			-output "${BINDIR}/{{.Dir}}-{{.OS}}-{{.Arch}}" \
+			-gcflags "$(GO_BUILD_FLAGS)" \
+			-ldflags '$(LDFLAGS)' \
+			-tags '$(TAGS)' \
+			./...
+
+run:
+	${BINDIR}/mystrom-exporter-$(shell $(GO) env GOOS)-$(shell $(GO) env GOARCH)
 
 
-all: linux mac arm64 arm
+generate: go-tools
+	$(GO) generate ./...
+
+go-tools: $(GOPATH)/bin/stringer $(GOPATH)/bin/gox
+
+# -- see more info on https://pkg.go.dev/golang.org/x/tools/cmd/stringer
+$(GOPATH)/bin/stringer:
+	$(GO) install golang.org/x/tools/cmd/stringer@latest
+
+$(GOPATH)/bin/gox:
+	$(GO) install github.com/mitchellh/gox@latest
+# --
+help:
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST)  | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'

README.md

@@ -28,9 +28,31 @@ $ ./mystrom-exporter --help
 ```
 | Flag | Description | Default |
 | ---- | ----------- | ------- |
-| switch.ip-address | IP address of the switch you try to monitor | `` |
 | web.listen-address | Address to listen on | `:9452` |
-| web.metrics-path | Path under which to expose metrics | `/metrics` |
+| web.metrics-path | Path under which to expose exporters own metrics | `/metrics` |
+| web.device-path | Path under which the metrics of the devices are fetched | `/device` |
+
+## Prometheus configuration
+A enhancement has been made to have only one exporter which can scrape multiple devices. This is configured in 
+Prometheus as follows assuming we have 4 mystrom devices and the exporter is running locally on the smae machine as 
+the Prometheus.
+```yaml
+ - job_name: mystrom
+   scrape_interval: 30s
+   metrics_path: /device
+   honor_labels: true
+   static_configs:
+   - targets:
+     - '192.168.105.11'
+     - '192.168.105.12'
+     - '192.168.105.13'
+     - '192.168.105.14'
+   relabel_configs:
+     - source_labels: [__address__]
+       target_label: __param_target
+     - target_label: __address__
+       replacement: 127.0.0.1:9452
+```
 
 ## Supported architectures
 Using the make file, you can easily build for the following architectures, those can also be considered the tested ones:
@@ -40,6 +62,7 @@ Using the make file, you can easily build for the following architectures, those
 | Linux | arm64 |
 | Linux | arm |
 | Mac | amd64 |
+| Mac | arm64 |
 
 Since go is cross compatible with windows, and mac arm as well, you should be able to build the binary for those as well, but they aren't tested.  
 The docker image is only built & tested for amd64.

go.mod

@@ -2,4 +2,10 @@ module mystrom-exporter
 
 go 1.15
 
-require github.com/prometheus/client_golang v1.10.0
+require (
+	github.com/gorilla/mux v1.7.3
+	github.com/prometheus/client_golang v1.10.0
+	github.com/prometheus/common v0.18.0
+	golang.org/x/sys v0.0.0-20220825204002-c680a09ffe64 // indirect
+	golang.org/x/tools v0.1.12
+)

go.sum

@@ -7,9 +7,11 @@ github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMx
 github.com/VividCortex/gohistogram v1.0.0/go.mod h1:Pf5mBqqDxYaXu3hDrrU+w6nw50o/4+TcAqDqk/vUH7g=
 github.com/afex/hystrix-go v0.0.0-20180502004556-fa1af6a1f4f5/go.mod h1:SkGFH1ia65gfNATL8TAiHDNxPzPdmEL5uirI2Uyuz6c=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 h1:JYp7IbQjafoB+tBA3gMyHYHrpOtNuDiK/uB5uXxq5wM=
 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d h1:UQZhZ2O0vMHr2cI+DC1Mbh0TJxzA3RcLoMsFw+aXw7E=
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
 github.com/apache/thrift v0.12.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
 github.com/apache/thrift v0.13.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
@@ -40,6 +42,7 @@ github.com/coreos/pkg v0.0.0-20160727233714-3ac0863d7acf/go.mod h1:E3G3o1h8I7cfc
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
 github.com/dustin/go-humanize v0.0.0-20171111073723-bb3d318650d4/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
@@ -89,6 +92,7 @@ github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5a
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.4 h1:L8R9j+yAqZuZjsqh/z+F1NCffTKKLShY6zXTItVIZ8M=
 github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
@@ -96,6 +100,7 @@ github.com/google/uuid v1.0.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+
 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
 github.com/gorilla/context v1.1.1/go.mod h1:kBGZzfjB9CEq2AlWe17Uuf7NDRt0dE0s8S51q0aT7Yg=
 github.com/gorilla/mux v1.6.2/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
+github.com/gorilla/mux v1.7.3 h1:gnP5JzjVOuiZD07fKKToCAOjS0yOpj/qPETTXCCS6hw=
 github.com/gorilla/mux v1.7.3/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
 github.com/gorilla/websocket v0.0.0-20170926233335-4201258b820c/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
 github.com/grpc-ecosystem/go-grpc-middleware v1.0.1-0.20190118093823-f849b5445de4/go.mod h1:FiyG127CGDf3tlThmgyCl78X/SZQqEOJBCDaAfeWzPs=
@@ -138,10 +143,13 @@ github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8
 github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvWXihfKN4Q=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
+github.com/konsorten/go-windows-terminal-sequences v1.0.3 h1:CE8S1cTafDpPvMhIxNJKvHsGVBgn1xWYf1NbHQhywc8=
 github.com/konsorten/go-windows-terminal-sequences v1.0.3/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
+github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/lightstep/lightstep-tracer-common/golang/gogo v0.0.0-20190605223551-bc2310a04743/go.mod h1:qklhhLq1aX+mtWk9cPHPzaBjWImj5ULL6C7HFJtXQMM=
 github.com/lightstep/lightstep-tracer-go v0.18.1/go.mod h1:jlF1pusYV4pidLvZ+XD0UBX0ZE6WURAspgAczcDHrL4=
@@ -198,6 +206,7 @@ github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/profile v1.2.1/go.mod h1:hJw3o1OdXxsrSjjVksARp5W95eeEaEfptyVZyv6JUPA=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/posener/complete v1.1.1/go.mod h1:em0nMJCgc9GFtwrmVmEMR/ZL6WyhyjMBndrE9hABlRI=
 github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=
@@ -237,6 +246,7 @@ github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529/go.mod h1:DxrIzT+xaE7yg
 github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
 github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
+github.com/sirupsen/logrus v1.6.0 h1:UBcNElsrwanuuMsnGSlYmtmgbb23qDR5dG+6X6Oo89I=
 github.com/sirupsen/logrus v1.6.0/go.mod h1:7uNnSEd1DgxDLC74fIahvMZmmYsHGZGEOFrfsX/uA88=
 github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d/go.mod h1:OnSkiWE9lh6wB0YB77sQom3nweQdgAjqCqsofrRNTgc=
 github.com/smartystreets/goconvey v1.6.4/go.mod h1:syvi0/a8iFYH4r/RixwvyeAJjdLS9QV7WQ/tjFTllLA=
@@ -251,11 +261,13 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20170815181823-89b8d40f7ca8/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
 github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
 github.com/urfave/cli v1.22.1/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
 github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 go.etcd.io/bbolt v1.3.3/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
 go.etcd.io/etcd v0.0.0-20191023171146-3cf2f69b5738/go.mod h1:dnLIgRNXwCJa5e+c6mIZCrds/GIG4ncV9HhK5PX7jPg=
 go.opencensus.io v0.20.1/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
@@ -275,6 +287,7 @@ golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8U
 golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
 golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
@@ -283,6 +296,8 @@ golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHl
 golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
 golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc=
 golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 h1:6zppjxzCulZykYSLyVDYbneBfbaBIQPYMevg0bEwv2s=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -300,6 +315,8 @@ golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200625001655-4c5254603344/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -309,6 +326,7 @@ golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180823144017-11551d06cbcc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -328,11 +346,20 @@ golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210309074719-68d13333faf2 h1:46ULzRKLh1CwgRq2dC5SlBzEqqNCi8rreOZnNrbqcIY=
 golang.org/x/sys v0.0.0-20210309074719-68d13333faf2/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220825204002-c680a09ffe64 h1:UiNENfZ8gDvpiWw7IpOMQ27spWmThO1RwwdQVbJahJM=
+golang.org/x/sys v0.0.0-20220825204002-c680a09ffe64/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
@@ -347,9 +374,13 @@ golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBn
 golang.org/x/tools v0.0.0-20190621195816-6e04913cbbac/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
 golang.org/x/tools v0.0.0-20191029041327-9cc4af7d6b2c/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191029190741-b9c20aec41a5/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20200103221440-774c71fcf114/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
+golang.org/x/tools v0.1.12 h1:VveCTK38A2rkS8ZqFY25HIDFscX5X9OoEhJd3quQmXU=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+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=
 google.golang.org/api v0.3.1/go.mod h1:6wY9I6uQWHQ8EM57III9mq/AjF+i8G65rmVagqKMtkk=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
@@ -376,9 +407,11 @@ google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miE
 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
 google.golang.org/protobuf v1.23.0 h1:4MY060fB1DLGMB/7MBTLnwQUY6+F09GEiz6SsrNqyzM=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6 h1:jMFz6MfLP0/4fUyZle81rXUoxOBFi19VUFKVDOQfozc=
 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=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/cheggaaa/pb.v1 v1.0.25/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
@@ -392,6 +425,7 @@ gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

main.go

@@ -1,199 +1,155 @@
+//go:generate stringer -type MystromReqStatus main.go
 package main
 
 import (
-	"encoding/json"
 	"flag"
 	"fmt"
-	"io/ioutil"
-	"log"
 	"net/http"
 	"os"
+	"strings"
 	"time"
 
+	"github.com/gorilla/mux"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"github.com/prometheus/common/log"
+
+	"mystrom-exporter/pkg/mystrom"
+	"mystrom-exporter/pkg/version"
 )
 
-type switchReport struct {
+// -- MystromRequestStatusType represents the request to MyStrom device status
-	Power       float64 `json:"power"`
+type MystromReqStatus uint32
-	WattPerSec  float64 `json:"Ws"`
-	Relay       bool    `json:relay`
-	Temperature float64 `json:"temperature`
-}
 
-const namespace = "mystrom"
+const (
+	OK MystromReqStatus = iota
+	ERROR_SOCKET
+	ERROR_TIMEOUT
+	ERROR_PARSING_VALUE
+)
+
+const namespace = "mystrom_exporter"
 
 var (
 	listenAddress = flag.String("web.listen-address", ":9452",
 		"Address to listen on")
 	metricsPath = flag.String("web.metrics-path", "/metrics",
-		"Path under which to expose metrics")
+		"Path under which to expose exporters own metrics")
-	switchIP = flag.String("switch.ip-address", "",
+	devicePath = flag.String("web.device-path", "/device",
-		"IP address of the switch you try to monitor")
+		"Path under which the metrics of the devices are fetched")
-
+	showVersion = flag.Bool("version", false,
-	up = prometheus.NewDesc(
+		"Show version information.")
-		prometheus.BuildFQName(namespace, "", "up"),
-		"Was the last myStrom query successful.",
-		nil, nil,
-	)
-	myStromPower = prometheus.NewDesc(
-		prometheus.BuildFQName(namespace, "", "report_power"),
-		"The current power consumed by devices attached to the switch",
-		nil, nil,
-	)
-
-	myStromRelay = prometheus.NewDesc(
-		prometheus.BuildFQName(namespace, "", "report_relay"),
-		"The current state of the relay (wether or not the relay is currently turned on)",
-		nil, nil,
-	)
-
-	myStromTemperature = prometheus.NewDesc(
-		prometheus.BuildFQName(namespace, "", "report_temperatur"),
-		"The currently measured temperature by the switch. (Might initially be wrong, but will automatically correct itself over the span of a few hours)",
-		nil, nil,
-	)
-
-	myStromWattPerSec = prometheus.NewDesc(
-		prometheus.BuildFQName(namespace, "", "report_watt_per_sec"),
-		"The average of energy consumed per second from last call this request",
-		nil, nil,
-	)
 )
-
+var (
-type Exporter struct {
+	mystromDurationCounterVec *prometheus.CounterVec
-	myStromSwitchIp string
+	mystromRequestsCounterVec *prometheus.CounterVec
-}
+)
-
+var landingPage = []byte(`<html>
-func NewExporter(myStromSwitchIp string) *Exporter {
+<head><title>myStrom switch report Exporter</title></head>
-	return &Exporter{
+<body>
-		myStromSwitchIp: myStromSwitchIp,
+<h1>myStrom Exporter</h1>
-	}
+<p><a href='` + *metricsPath + `'>Metrics</a></p>
-}
+</body>
-
+</html>`)
-func (e *Exporter) Describe(ch chan<- *prometheus.Desc) {
-	ch <- up
-	ch <- myStromPower
-	ch <- myStromRelay
-	ch <- myStromTemperature
-	ch <- myStromWattPerSec
-}
-
-func (e *Exporter) Collect(ch chan<- prometheus.Metric) {
-	ch <- prometheus.MustNewConstMetric(
-		up, prometheus.GaugeValue, 1,
-	)
-
-	e.FetchSwitchMetrics(e.myStromSwitchIp, ch)
-}
-
-func (e *Exporter) FetchSwitchMetrics(switchIP string, ch chan<- prometheus.Metric) {
-
-	report, err := FetchReport(switchIP)
-
-	if err != nil {
-		log.Printf("Error occured, while fetching metrics: %s", err)
-		ch <- prometheus.MustNewConstMetric(
-			up, prometheus.GaugeValue, 0,
-		)
-		return
-	}
-
-	ch <- prometheus.MustNewConstMetric(
-		myStromPower, prometheus.GaugeValue, report.Power,
-	)
-
-	if report.Relay {
-		ch <- prometheus.MustNewConstMetric(
-			myStromRelay, prometheus.GaugeValue, 1,
-		)
-	} else {
-		ch <- prometheus.MustNewConstMetric(
-			myStromRelay, prometheus.GaugeValue, 0,
-		)
-	}
-
-	ch <- prometheus.MustNewConstMetric(
-		myStromWattPerSec, prometheus.GaugeValue, report.WattPerSec,
-	)
-
-	ch <- prometheus.MustNewConstMetric(
-		myStromTemperature, prometheus.GaugeValue, report.Temperature,
-	)
-
-}
-
-func FetchReport(switchIP string) (*switchReport, error) {
-	log.Printf("Trying to connect to switch at: %s\n", switchIP)
-	url := "http://" + switchIP + "/report"
-
-	switchClient := http.Client{
-		Timeout: time.Second * 5, // 3 second timeout, might need to be increased
-	}
-
-	req, err := http.NewRequest(http.MethodGet, url, nil)
-	if err != nil {
-		return nil, err
-	}
-
-	req.Header.Set("User-Agent", "myStrom-exporter")
-
-	res, getErr := switchClient.Do(req)
-	if getErr != nil {
-		log.Printf("Error while trying to connect to switch: %s\n", getErr)
-		return nil, getErr
-
-	}
-
-	if res.Body != nil {
-		defer res.Body.Close()
-	}
-
-	body, readErr := ioutil.ReadAll(res.Body)
-	if readErr != nil {
-		log.Printf("Error while reading body: %s\n", readErr)
-		return nil, readErr
-	}
-
-	report := switchReport{}
-	err = json.Unmarshal(body, &report)
-	if err != nil {
-		log.Printf("Error while unmarshaling report: %s\n", err)
-		return nil, err
-	}
-
-	return &report, nil
-}
 
 func main() {
 
 	flag.Parse()
 
-	if *switchIP == "" {
+	// -- show version information
-		flag.Usage()
+	if *showVersion {
-		fmt.Println("\nNo switch.ip-address provided")
+		v, err := version.Print("mystrom_exporter")
-		os.Exit(1)
+		if err != nil {
+			log.Fatalf("Failed to print version information: %#v", err)
+		}
+
+		fmt.Fprintln(os.Stdout, v)
+		os.Exit(0)
 	}
 
-	exporter := NewExporter(*switchIP)
+	// -- create a new registry for the exporter telemetry
-	prometheus.MustRegister(exporter)
+	telemetryRegistry := setupMetrics()
 
-	http.Handle(*metricsPath, promhttp.Handler())
+	router := mux.NewRouter()
-	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+	router.Handle(*metricsPath, promhttp.HandlerFor(telemetryRegistry, promhttp.HandlerOpts{}))
-		w.Write([]byte(`<html>
+	router.HandleFunc(*devicePath, scrapeHandler)
-             <head><title>myStrom switch report Exporter</title></head>
+	router.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
-             <body>
+		w.Write(landingPage)
-             <h1>myStrom Exporter</h1>
-             <p><a href='` + *metricsPath + `'>Metrics</a></p>
-             </body>
-             </html>`))
 	})
+	log.Infoln("Listening on address " + *listenAddress)
+	log.Fatal(http.ListenAndServe(*listenAddress, router))
+}
 
-	_, err := FetchReport(*switchIP)
+func scrapeHandler(w http.ResponseWriter, r *http.Request) {
-	if err != nil {
+	target := r.URL.Query().Get("target")
-		log.Fatalf("Switch at address %s couldn't be reached. Ensure it is reachable before starting the exporter", *switchIP)
+	if target == "" {
+		http.Error(w, "'target' parameter must be specified", http.StatusBadRequest)
+		return
 	}
 
-	log.Printf("Starting listener on %s\n", *listenAddress)
+	log.Infof("got scrape request for target '%v'", target)
-	log.Fatal(http.ListenAndServe(*listenAddress, nil))
+	exporter := mystrom.NewExporter(target)
+
+	start := time.Now()
+	gatherer, err := exporter.Scrape()
+	duration := time.Since(start).Seconds()
+	if err != nil {
+		if strings.Contains(fmt.Sprintf("%v", err), "unable to connect with target") {
+			mystromRequestsCounterVec.WithLabelValues(target, ERROR_SOCKET.String()).Inc()
+		} else if strings.Contains(fmt.Sprintf("%v", err), "i/o timeout") {
+			mystromRequestsCounterVec.WithLabelValues(target, ERROR_TIMEOUT.String()).Inc()
+		} else {
+			mystromRequestsCounterVec.WithLabelValues(target, ERROR_PARSING_VALUE.String()).Inc()
+		}
+		http.Error(
+			w,
+			fmt.Sprintf("failed to scrape target '%v': %v", target, err),
+			http.StatusInternalServerError,
+		)
+		log.Error(err)
+		return
+	}
+	mystromDurationCounterVec.WithLabelValues(target).Add(duration)
+	mystromRequestsCounterVec.WithLabelValues(target, OK.String()).Inc()
+
+	promhttp.HandlerFor(gatherer, promhttp.HandlerOpts{}).ServeHTTP(w, r)
+}
+
+// -- setupMetrics creates a new registry for the exporter telemetry
+func setupMetrics() *prometheus.Registry {
+	registry := prometheus.NewRegistry()
+	registry.MustRegister(prometheus.NewGoCollector())
+	registry.MustRegister(prometheus.NewProcessCollector(prometheus.ProcessCollectorOpts{}))
+
+	mystromDurationCounterVec = prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Namespace: namespace,
+			Name:      "request_duration_seconds_total",
+			Help:      "Total duration of mystrom successful requests by target in seconds",
+		},
+		[]string{"target"})
+	registry.MustRegister(mystromDurationCounterVec)
+
+	mystromRequestsCounterVec = prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Namespace: namespace,
+			Name:      "requests_total",
+			Help:      "Number of mystrom request by status and target",
+		},
+		[]string{"target", "status"})
+	registry.MustRegister(mystromRequestsCounterVec)
+
+	// -- make the build information is available through a metric
+	buildInfo := prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Namespace: namespace,
+			Name:      "build_info",
+			Help:      "A metric with a constant '1' value labeled by build information.",
+		},
+		[]string{"version", "revision", "branch", "goversion", "builddate", "builduser"},
+	)
+	buildInfo.WithLabelValues(version.Version, version.Revision, version.Branch, version.GoVersion, version.BuildDate, version.BuildUser).Set(1)
+	registry.MustRegister(buildInfo)
+
+	return registry
 }

pkg/mystrom/mystrom.go

@@ -0,0 +1,214 @@
+package mystrom
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"time"
+
+	"github.com/prometheus/common/log"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+const namespace = "mystrom"
+
+// 5 second timeout, might need to be increased
+const reqTimeout = time.Second * 5
+
+type switchReport struct {
+	Power       float64 `json:"power"`
+	WattPerSec  float64 `json:"Ws"`
+	Relay       bool    `json:"relay"`
+	Temperature float64 `json:"temperature"`
+}
+
+type switchInfo struct {
+	Version   string  `json:"version"`
+	Mac       string  `json:"mac"`
+	SwType    float64 `json:"type"`
+	SSID      string  `json:"ssid"`
+	Static    bool    `json:"static"`
+	Connected bool    `json:"connected"`
+}
+
+// Exporter --
+type Exporter struct {
+	myStromSwitchIp string
+	switchType      float64
+}
+
+// NewExporter --
+func NewExporter(switchIP string) *Exporter {
+	return &Exporter{
+		myStromSwitchIp: switchIP,
+	}
+}
+
+// Scrape --
+func (e *Exporter) Scrape() (prometheus.Gatherer, error) {
+	reg := prometheus.NewRegistry()
+
+	// --
+	bodyInfo, err := e.fetchData("/api/v1/info")
+	if err != nil {
+	}
+
+	info := switchInfo{}
+	err = json.Unmarshal(bodyInfo, &info)
+	if err != nil {
+		// fmt.Println(err)
+		// ch <- prometheus.MustNewConstMetric(
+		// 	up, prometheus.GaugeValue, 0,
+		// )
+		return reg, fmt.Errorf("unable to decode switchReport: %v", err.Error())
+	}
+	log.Debugf("info: %#v", info)
+	e.switchType = info.SwType
+
+	if err := registerInfoMetrics(reg, info, e.myStromSwitchIp); err != nil {
+		return nil, fmt.Errorf("failed to register metrics : %v", err.Error())
+	}
+
+	// --
+	bodyData, err := e.fetchData("/report")
+	if err != nil {
+	}
+
+	report := switchReport{}
+	err = json.Unmarshal(bodyData, &report)
+	if err != nil {
+		// fmt.Println(err)
+		// ch <- prometheus.MustNewConstMetric(
+		// 	up, prometheus.GaugeValue, 0,
+		// )
+		return reg, fmt.Errorf("unable to decode switchReport: %v", err.Error())
+	}
+	log.Debugf("report: %#v", report)
+
+	if err := registerMetrics(reg, report, e.myStromSwitchIp, e.switchType); err != nil {
+		return nil, fmt.Errorf("failed to register metrics : %v", err.Error())
+	}
+
+	return reg, nil
+}
+
+// fetchData -- get the data from the switch under the given path
+func (e *Exporter) fetchData(urlpath string) ([]byte, error) {
+	url := "http://" + e.myStromSwitchIp + urlpath
+
+	switchClient := http.Client{
+		Timeout: reqTimeout,
+		Transport: &http.Transport{
+			DisableCompression: true,
+		},
+	}
+
+	req, err := http.NewRequest(http.MethodGet, url, nil)
+	if err != nil {
+		// ch <- prometheus.MustNewConstMetric(
+		// 	up, prometheus.GaugeValue, 0,
+		// )
+	}
+	req.Header.Set("User-Agent", "myStrom-exporter")
+
+	res, getErr := switchClient.Do(req)
+	if getErr != nil {
+		// ch <- prometheus.MustNewConstMetric(
+		// 	up, prometheus.GaugeValue, 0,
+		// )
+	}
+	if res.Body != nil {
+		defer res.Body.Close()
+	}
+
+	body, readErr := ioutil.ReadAll(res.Body)
+	if readErr != nil {
+		// ch <- prometheus.MustNewConstMetric(
+		// 	up, prometheus.GaugeValue, 0,
+		// )
+		return []byte{}, fmt.Errorf("unable to read body: %v", readErr.Error())
+	}
+
+	return body, nil
+}
+
+// registerMetrics --
+func registerMetrics(reg prometheus.Registerer, data switchReport, target string, st float64) error {
+
+	// --
+	collectorRelay := prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Namespace: namespace,
+			Name:      "relay",
+			Help:      "The current state of the relay (wether or not the relay is currently turned on)",
+		},
+		[]string{"instance"})
+
+	if err := reg.Register(collectorRelay); err != nil {
+		return fmt.Errorf("failed to register metric %v: %v", "relay", err.Error())
+	}
+
+	if data.Relay {
+		collectorRelay.WithLabelValues(target).Set(1)
+	} else {
+		collectorRelay.WithLabelValues(target).Set(0)
+	}
+
+	if st != 114 {
+		// --
+		collectorPower := prometheus.NewGaugeVec(
+			prometheus.GaugeOpts{
+				Namespace: namespace,
+				Name:      "power",
+				Help:      "The current power consumed by devices attached to the switch",
+			},
+			[]string{"instance"})
+
+		if err := reg.Register(collectorPower); err != nil {
+			return fmt.Errorf("failed to register metric %v: %v", "power", err.Error())
+		}
+
+		collectorPower.WithLabelValues(target).Set(data.Power)
+
+		// --
+		collectorTemperature := prometheus.NewGaugeVec(
+			prometheus.GaugeOpts{
+				Namespace: namespace,
+				Name:      "temperature",
+				Help:      "The currently measured temperature by the switch. (Might initially be wrong, but will automatically correct itself over the span of a few hours)",
+			},
+			[]string{"instance"})
+
+		if err := reg.Register(collectorTemperature); err != nil {
+			return fmt.Errorf("failed to register metric %v: %v", "temperature", err.Error())
+		}
+
+		collectorTemperature.WithLabelValues(target).Set(data.Temperature)
+
+	}
+
+	return nil
+}
+
+// registerMetrics --
+func registerInfoMetrics(reg prometheus.Registerer, data switchInfo, target string) error {
+
+	// --
+	collectorInfo := prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Namespace: namespace,
+			Name:      "info",
+			Help:      "general information about the device",
+		},
+		[]string{"instance", "version", "mac", "type", "ssid"})
+
+	if err := reg.Register(collectorInfo); err != nil {
+		return fmt.Errorf("failed to register metric %v: %v", "info", err.Error())
+	}
+
+	collectorInfo.WithLabelValues(target, data.Version, data.Mac, fmt.Sprintf("%v", data.SwType), data.SSID).Set(1)
+
+	return nil
+}

pkg/version/version.go

@@ -0,0 +1,60 @@
+package version
+
+import (
+	"bytes"
+	"fmt"
+	"runtime"
+	"strings"
+	"text/template"
+)
+
+// Build information. Populated at build-time.
+var (
+	Version   string
+	Revision  string
+	Branch    string
+	BuildUser string
+	BuildDate string
+	GoVersion = runtime.Version()
+)
+
+// versionInfoTmpl contains the template used by Print.
+var versionInfoTmpl = `
+{{.program}}, version {{.version}} (branch: {{.branch}}, revision: {{.revision}})
+  build user:       {{.buildUser}}
+  build date:       {{.buildDate}}
+  go version:       {{.goVersion}}
+`
+
+// Print returns version information.
+func Print(program string) (string, error) {
+	m := map[string]string{
+		"program":   program,
+		"version":   Version,
+		"revision":  Revision,
+		"branch":    Branch,
+		"buildUser": BuildUser,
+		"buildDate": BuildDate,
+		"goVersion": GoVersion,
+	}
+	t, err := template.New("version").Parse(versionInfoTmpl)
+	if err != nil {
+		return "", err
+	}
+
+	var buf bytes.Buffer
+	if err := t.ExecuteTemplate(&buf, "version", m); err != nil {
+		return "", err
+	}
+	return strings.TrimSpace(buf.String()), nil
+}
+
+// Info returns version, branch and revision information.
+func Info() string {
+	return fmt.Sprintf("(version=%s, branch=%s, revision=%s)", Version, Branch, Revision)
+}
+
+// BuildContext returns goVersion, buildUser and buildDate information.
+func BuildContext() string {
+	return fmt.Sprintf("(go=%s, user=%s, date=%s)", GoVersion, BuildUser, BuildDate)
+}

tools.go

@@ -0,0 +1,7 @@
+// +build tools
+
+package main
+
+import (
+	_ "golang.org/x/tools/cmd/stringer"
+)