✨ (cfenv) Pull config from Cloud Foundry environment if available (#7)

README.md

@@ -8,6 +8,7 @@ Tri Tra Trulla La!
 * Available as minimal container image (`FROM scratch`)
 * Prometheus endpoint availabe (`/metrics`)
 * Supports tracing
+* May use MongoDB as persistance layer to display a simple web counter (optional)
 
 ## Usage
 
@@ -28,6 +29,33 @@ Get metrics:
 curl localhost:8080/metrics
 ```
 
+### Running with enabled persistence
+
+You can run Caasperli with an optional persistance layer and it will display a
+simple hit counter with data from MongoDB.
+
+```bash
+potz-holzoepfel-und-zipfelchape \
+  --persistance
+  --mongodb-uri="mongodb://root:hunter2@localhost:27017"
+```
+
+### Persistence on Cloud Foundry
+
+If you are running on Cloud Foundry you can activate the persistence layer by
+attaching a MongoDB service called `mongodb` to the application.
+
+```
+cf push caasperli --no-start
+cf create-service mongodb <plan> mongodb
+cf bind-service caasperli mongodb
+cf start caasperli
+```
+
+Caasperli will detect that it is running on Cloud Foundry and automatically
+activate it's persistance layer if a service called `mongodb` is bound to the
+app.
+
 ## Development
 
 ### Statik

cmd/root.go

@@ -4,6 +4,9 @@ import (
 	"fmt"
 	"os"
 
+	log "github.com/sirupsen/logrus"
+
+	"github.com/cloudfoundry-community/go-cfenv"
 	homedir "github.com/mitchellh/go-homedir"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
@@ -81,4 +84,18 @@ func initConfig() {
 	if err := viper.ReadInConfig(); err == nil {
 		fmt.Println("Using config file:", viper.ConfigFileUsed())
 	}
+
+	if cfenv.IsRunningOnCF() {
+		log.Info("We are running on Cloud Foundry!")
+		appEnv, _ := cfenv.Current()
+		mongoService, err := appEnv.Services.WithName("mongodb")
+		if err != nil {
+			log.Warn(err)
+		} else {
+			mongodbURI, _ = mongoService.CredentialString("uri")
+			persistence = true
+			log.Info("MongoDB credentials detected in service mongodb, activating persistence layer.")
+		}
+	}
+
 }

go.mod

@@ -3,6 +3,7 @@ module github.com/adfinis-sygroup/potz-holzoepfel-und-zipfelchape
 go 1.13
 
 require (
+	github.com/cloudfoundry-community/go-cfenv v1.18.0
 	github.com/fsnotify/fsnotify v1.4.9 // indirect
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/mitchellh/mapstructure v1.3.3 // indirect

go.sum

@@ -54,6 +54,8 @@ github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/clbanning/x2j v0.0.0-20191024224557-825249438eec/go.mod h1:jMjuTZXRI4dUb/I5gc9Hdhagfvm9+RyrPryS/auMzxE=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cloudfoundry-community/go-cfenv v1.18.0 h1:dOIRSHUSaj4r6Q9Cx+nzz2OytHt+QNKqtOuKTQsa+zw=
+github.com/cloudfoundry-community/go-cfenv v1.18.0/go.mod h1:qGMSI6lygPzqugFs9M1NFjJBtEPgl0MgT6drMFZGUoU=
 github.com/cockroachdb/datadriven v0.0.0-20190809214429-80d97fb3cbaa/go.mod h1:zn76sxSg3SzpJ0PPJaLDCu+Bu0Lg3sKTORVIj19EIF8=
 github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd/go.mod h1:sE/e/2PUdi/liOCUjSTXgM1o87ZssimdTWN964YiIeI=
 github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
@@ -222,6 +224,7 @@ github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANyt
 github.com/influxdata/influxdb1-client v0.0.0-20191209144304-8bf82d3c094d/go.mod h1:qj24IKcXYK6Iy9ceXlo3Tc+vtHo9lIhSX5JddghvEPo=
 github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af h1:pmfjZENx5imkbgOkpRUYLnmbU7UEFbjtDA2hxJ1ichM=
 github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=
+github.com/joefitzgerald/rainbow-reporter v0.1.0/go.mod h1:481CNgqmVHQZzdIbN52CupLJyoVwB10FQ/IQlF1pdL8=
 github.com/joho/godotenv v1.3.0/go.mod h1:7hK45KPybAkOC6peb+G5yklZfMxEjkZhHbwpqxOKXbg=
 github.com/jonboulle/clockwork v0.1.0/go.mod h1:Ii8DK3G1RaLaWxj9trq07+26W01tbo22gdxWY5EU2bo=
 github.com/jpillora/backoff v1.0.0/go.mod h1:J/6gKK9jxlEcS3zixgDgUAsiuZ7yrSoa/FX5e0EB2j4=
@@ -309,7 +312,9 @@ github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn
 github.com/olekukonko/tablewriter v0.0.0-20170122224234-a0225b3f23b5/go.mod h1:vsDQFd/mU46D+Z4whnwzcISnGGzXWMclvtLoiIKAKIo=
 github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
 github.com/onsi/ginkgo v1.7.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
+github.com/onsi/ginkgo v1.8.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
 github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
+github.com/onsi/gomega v1.5.0/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
 github.com/op/go-logging v0.0.0-20160315200505-970db520ece7/go.mod h1:HzydrMdWErDVzsI23lYNej1Htcns9BCg93Dk0bBINWk=
 github.com/opentracing-contrib/go-observer v0.0.0-20170622124052-a52f23424492/go.mod h1:Ngi6UdF0k5OKD5t5wlmGhe/EDKPoUM3BXZSSfIuJbis=
 github.com/opentracing/basictracer-go v1.0.0/go.mod h1:QfBfYuafItcjQuMwinw9GhYKwFXS9KnPs5lxoYwgW74=
@@ -399,6 +404,7 @@ github.com/russross/blackfriday v1.5.2/go.mod h1:JO/DiYxRf+HjHt06OyowR9PTA263kcR
 github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/ryanuber/columnize v0.0.0-20160712163229-9b3edd62028f/go.mod h1:sm1tb6uqfes/u+d4ooFouqFdy9/2g9QGwK3SQygK0Ts=
 github.com/samuel/go-zookeeper v0.0.0-20190923202752-2cc03de413da/go.mod h1:gi+0XIa01GRL2eRQVjQkKGqKF3SF9vZR/HnPullcV2E=
+github.com/sclevine/spec v1.2.0/go.mod h1:W4J29eT/Kzv7/b9IWLB055Z+qvVC9vt0Arko24q7p+U=
 github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529/go.mod h1:DxrIzT+xaE7yg65j358z/aeFdxmN0P9QXhEzd20vsDc=
 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=

manifest.yml

@@ -5,4 +5,4 @@ applications:
   buildpacks:
     - go_buildpack
   env:
-    GOVERSION: go1.13
+    GOVERSION: go1.14