Uptime HTTP server, displays uptime information as response to HTTP r…

…equest

.gitignore

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+bin

Makefile

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+BINARY	= bin/uptime-httpd
+GO	= env GOPATH="$(PWD)/vendor:$(PWD)" go
+
+all:
+	@echo "make release   # Build a release version"
+	@echo "make run       # Run a development version"
+
+release: clean
+	@env GOOS=linux GOARCH=amd64 $(GO) build -o $(BINARY) uptime-httpd.go
+
+run: clean
+	@$(GO) build -o $(BINARY) uptime-httpd.go
+	@./$(BINARY)
+
+clean:
+	rm -fr bin pkg vendor/pkg

init.d/uptime-httpd

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+#! /bin/sh
+
+### BEGIN INIT INFO
+# Provides:				uptime-httpd
+# Required-Start:		$remote_fs $syslog
+# Required-Stop:		$remote_fs $syslog
+# Should-Start:			$network
+# Should-Stop:			$network
+# Default-Start:		2 3 4 5
+# Default-Stop:			0 1 6
+# Short-Description:	Uptime HTTPd
+# Description:			Starts the Uptime HTTPd service in the background
+### END INIT INFO
+
+PATH=/sbin:/usr/sbin:/bin:/usr/bin
+
+GOPATH="/path/to/this/project"
+
+UHTTPD="$GOPATH/bin/uptime-httpd"
+UHTTPD_NAME="uptime-httpd"
+UHTTPD_PID="/var/run/$UHTTPD_NAME.pid"
+UHTTPD_LOG_DIR="$/var/log/$UHTTPD_NAME" ; mkdir -p $UHTTPD_LOG_DIR
+UHTTPD_LOG_FILE="$UHTTPD_LOG_DIR/$UHTTPD_NAME.log"
+
+SSD_PARAMS="--quiet --oknodo --pidfile $UHTTPD_PID"
+
+set -e
+test -x $UHTTPD || exit 0
+
+. /lib/lsb/init-functions
+
+case "$1" in
+	start)
+		log_daemon_msg "Starting Uptime HTTPd service" "$UHTTPD_NAME" || true
+		if start-stop-daemon --start $SSD_PARAMS --make-pidfile --background --no-close --exec $UHTTPD >> $UHTTPD_LOG_FILE 2>&1; then
+			log_end_msg 0 || true
+		else
+			log_end_msg 1 || true
+		fi
+		;;
+
+	stop)
+		log_daemon_msg "Stopping Uptime HTTPd service" "$UHTTPD_NAME" || true
+		if start-stop-daemon --stop --retry 10 $SSD_PARAMS; then
+			log_end_msg 0 || true
+		else
+			log_end_msg 1 || true
+		fi
+		;;
+
+	restart)
+		$0 stop
+		$0 start
+		;;
+
+	status)
+		status_of_proc -p $UHTTPD_PID $UHTTPD $UHTTPD_NAME && exit 0 || exit $?
+		;;
+
+	*)
+		log_action_msg "Usage: /etc/init.d/$UHTTPD_NAME {start|stop|restart|status}" || true
+		exit 1
+esac
+
+exit 0

readme.md

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+# _uptime_ HTTP server
+
+## Features
+* Returns _uptime_ of server running the uptime-http-server
+* Define listening socket using _-socket_
+
+## Usage
+```
+./uptime-httpd [-socket=":80"]
+```
+
+## Todo (someday)
+* Request logging
+
+## Author
+* [René Feiner](http://feiner.nu) for internal usage at [MessageBird](https://www.messagebird.com)
+
+## Thanks to
+* [Maurice Nonnekes](https://github.com/prep)

uptime-httpd.go

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+package main
+
+import (
+    "fmt"
+    "net/http"
+    "log"
+    "flag"
+    "os/exec"
+)
+
+var bindSocket = flag.String("socket", ":80", "Define socket where to listen for the HTTP requests")
+
+func handler(w http.ResponseWriter, r *http.Request) {
+    out, err := exec.Command("/usr/bin/uptime").Output()
+    if err != nil {
+        fmt.Fprintf(w, "Error, unable to retrieve uptime: %s", err)
+        log.Fatal(err)
+    }
+    fmt.Fprintf(w, "%s", out)
+}
+
+func main() {
+    flag.Parse()
+    fmt.Printf("Starting server at %s\n", *bindSocket)
+
+    http.HandleFunc("/", handler)
+    http.ListenAndServe(*bindSocket, nil)
+}