func history(w http.ResponseWriter, r *http.Request) {
if !basicAuth(w, r) {
return
}
to := time.Now()
from := to.Add(-1 * time.Hour)
list := db.ReadDiffies(from, to)
reply(w, list)
}
func Graph(width int, height int) ([]Point, []Point, []Point, []Point) {
to := time.Now()
from := to.Add(-24 * time.Hour)
list := db.ReadDiffies(from, to)
user := make([]Point, 1)
iowait := make([]Point, 1)
temperature := make([]Point, 1)
t0 := list[0].Timestamp.Unix()
tf := list[len(list)-1].Timestamp.Unix()
d := int(tf - t0)
p0 := Point{x: 0, y: height}
user[0], iowait[0], temperature[0] = p0, p0, p0
xold := 0
for _, diff := range list {
xi := width * int(diff.Timestamp.Unix()-t0) / d
if xi-xold > 10 {
p1 := Point{x: xold, y: height}
user, iowait, temperature = append(user, p1), append(iowait, p1), append(temperature, p1)
p2 := Point{x: xi, y: height}
user, iowait, temperature = append(user, p2), append(iowait, p2), append(temperature, p2)
}
user = append(user, Point{x: xi, y: height - int(diff.User/100.0*float64(height))})
iowait = append(iowait, Point{x: xi, y: height - int(diff.Iowait/100.0*float64(height))})
temperature = append(temperature, Point{x: xi, y: height - int(diff.Temperature/100.0*float64(height))})
xold = xi
}
pf := Point{x: width, y: height}
user, iowait, temperature = append(user, pf), append(iowait, pf), append(temperature, pf)
box := []Point{Point{x: 0, y: 0}, Point{x: width, y: 0}, Point{x: width, y: height}, Point{x: 0, y: height}}
return box, user, temperature, iowait
}