Added scripts to generate graphs.

bin/plotter.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+# Simple script to generate a timeseries graph from a data file.
+# Depencies: gnuplot
+
+# arg 1: path to file with the raw data
+# arg 2: path to file to save the graph in (.png will be appended)
+# arg 3: optional title to show on the graph
+
+gnuplot << EOF
+set datafile separator ","
+set xdata time
+set timefmt "%s" #time format of input data
+
+set terminal png size 800,200 transparent truecolor
+set output "$2.png"
+set format x "%d/%m" # format of output time
+set grid
+set title "$3" # If a second arg was supplied we show it as a title too
+unset key
+
+plot "$1" every 4 using 1:2 with lines linewidth 2
+EOF

bin/update_graphs.go

@@ -0,0 +1,93 @@
+package main
+
+import (
+	"crypto/sha256"
+	"database/sql"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"time"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+// TODO: change these to be cmd args instead!
+const db_file = "/home/lmas/projects/ss13_se/src/db.sqlite3"
+
+// Dir to save new graphs in
+const save_dir = "/home/lmas/projects/ss13_se/src/static/graphs"
+
+// How far back in time the graphs will go
+var last_week = time.Now().AddDate(0, 0, -7)
+
+func checkerror(err error) {
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+func main() {
+	// open a db connection
+	db, err := sql.Open("sqlite3", db_file)
+	checkerror(err)
+	defer db.Close()
+
+	// loop over each server in db
+	rows, err := db.Query("select id, title from gameservers_server")
+	checkerror(err)
+	defer rows.Close()
+
+	var (
+		id    int
+		title string
+	)
+	for rows.Next() {
+		err := rows.Scan(&id, &title)
+		checkerror(err)
+		creategraphs(db, id, title)
+	}
+	err = rows.Err()
+	checkerror(err)
+}
+
+func creategraphs(db *sql.DB, id int, title string) {
+	// create a tmp file
+	ifile, err := ioutil.TempFile("", "graph")
+	checkerror(err)
+	defer ifile.Close()
+	ifilename := ifile.Name()
+
+	// Make sure we have somewhere to save the stored graphs in
+	err = os.MkdirAll(save_dir, 0777)
+	checkerror(err)
+	hash := fmt.Sprintf("%x", sha256.Sum256([]byte(title)))
+	ofilename := filepath.Join(save_dir, hash)
+
+	// get the server's data and write it to the file
+	rows, err := db.Query("select created,players from gameservers_serverhistory where server_id = ? and created >= ? order by created asc", id, last_week)
+	checkerror(err)
+
+	var (
+		created time.Time
+		players int
+	)
+	for rows.Next() {
+		err := rows.Scan(&created, &players)
+		checkerror(err)
+		_, err = ifile.WriteString(fmt.Sprintf("%d, %d\n", created.Unix(), players))
+		checkerror(err)
+	}
+	err = rows.Err()
+	checkerror(err)
+
+	// run the plotter against the data file
+	err = exec.Command("./plotter.sh", ifilename, ofilename).Run()
+	checkerror(err)
+
+	// close and remove the tmp file
+	ifile.Close()
+	os.Remove(ifilename)
+}