move: log parsers

logparser/testing/report/result.go

@@ -0,0 +1,60 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package report
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+// always put all the related things together as in here
+
+// Result stores metrics for a domain
+// it uses the value mechanics,
+// because it doesn't have to update anything
+type Result struct {
+	Domain    string `json:"domain"`
+	Visits    int    `json:"visits"`
+	TimeSpent int    `json:"time_spent"`
+	// add more metrics if needed
+}
+
+// add adds the metrics of another Result to itself and returns a new Result
+func (r Result) add(other Result) Result {
+	return Result{
+		Domain:    r.Domain,
+		Visits:    r.Visits + other.Visits,
+		TimeSpent: r.TimeSpent + other.TimeSpent,
+	}
+}
+
+// parse parses a single log line
+func parse(line string) (r Result, err error) {
+	fields := strings.Fields(line)
+	if len(fields) != 3 {
+		return r, fmt.Errorf("missing fields: %v", fields)
+	}
+
+	f := new(field)
+	r.Domain = fields[0]
+	r.Visits = f.atoi("visits", fields[1])
+	r.TimeSpent = f.atoi("time spent", fields[2])
+	return r, f.err
+}
+
+// field helps for field parsing
+type field struct{ err error }
+
+func (f *field) atoi(name, val string) int {
+	n, err := strconv.Atoi(val)
+	if n < 0 || err != nil {
+		f.err = fmt.Errorf("incorrect %s: %q", name, val)
+	}
+	return n
+}