Cleanup of project structure

I am sorry in advance for the big commits. Compilation
of the project will fail between commits and the changes
done here should probably have been separated into smaller
commits, but this project is still very fresh so I hope its fine.

Delete fileStore as it never worked anyway.
Remove lineprotocol package as it only made things more complicated
than they need to be.

lineprotocol_test.go

@@ -0,0 +1,89 @@
+package main
+
+import (
+	"bufio"
+	"reflect"
+	"strings"
+	"testing"
+)
+
+var raw = "node,host=lousxps,cluster=test mem_used=4692.252,proc_total=1083,load_five=0.91,cpu_user=1.424336e+06,cpu_guest_nice=0,cpu_guest=0,mem_available=9829.848,mem_slab=514.796,mem_free=4537.956,proc_run=2,cpu_idle=2.1589764e+07,swap_total=0,mem_cached=6368.5,swap_free=0,load_fifteen=0.93,cpu_nice=196,cpu_softirq=41456,mem_buffers=489.992,mem_total=16088.7,load_one=0.84,cpu_system=517223,cpu_iowait=8994,cpu_steal=0,cpu_irq=113265,mem_sreclaimable=362.452 1629356936\n"
+var expectedMeasurement = `node`
+var expectedTags = map[string]string{
+	"host":    "lousxps",
+	"cluster": "test",
+}
+var expectedFields = []Metric{
+	{"mem_used", 4692.252},
+	{"proc_total", 1083},
+	{"load_five", 0.91},
+	{"cpu_user", 1.424336e+06},
+	{"cpu_guest_nice", 0},
+	{"cpu_guest", 0},
+	{"mem_available", 9829.848},
+	{"mem_slab", 514.796},
+	{"mem_free", 4537.956},
+	{"proc_run", 2},
+	{"cpu_idle", 2.1589764e+07},
+	{"swap_total", 0},
+	{"mem_cached", 6368.5},
+	{"swap_free", 0},
+	{"load_fifteen", 0.93},
+	{"cpu_nice", 196},
+	{"cpu_softirq", 41456},
+	{"mem_buffers", 489.992},
+	{"mem_total", 16088.7},
+	{"load_one", 0.84},
+	{"cpu_system", 517223},
+	{"cpu_iowait", 8994},
+	{"cpu_steal", 0},
+	{"cpu_irq", 113265},
+	{"mem_sreclaimable", 362.452},
+}
+var expectedTimestamp int64 = 1629356936
+
+func TestParseLine(t *testing.T) {
+	line, err := Parse(raw)
+	if err != nil {
+		t.Error(err)
+	}
+
+	if line.Measurement != expectedMeasurement {
+		t.Error("measurement not as expected")
+	}
+
+	if line.Ts.Unix() != int64(expectedTimestamp) {
+		t.Error("timestamp not as expected")
+	}
+
+	if !reflect.DeepEqual(line.Tags, expectedTags) {
+		t.Error("tags not as expected")
+	}
+
+	if !reflect.DeepEqual(line.Fields, expectedFields) {
+		t.Error("fields not as expected")
+	}
+}
+
+func BenchmarkParseLine(b *testing.B) {
+	b.StopTimer()
+	lines := strings.Repeat(raw, b.N)
+	scanner := bufio.NewScanner(strings.NewReader(lines))
+	scanner.Split(bufio.ScanLines)
+
+	b.StartTimer()
+	for i := 0; i < b.N; i++ {
+		ok := scanner.Scan()
+		if !ok {
+			b.Error("woops")
+			return
+		}
+
+		line := scanner.Text()
+		_, err := Parse(line)
+		if err != nil {
+			b.Error(err)
+			return
+		}
+	}
+}