interfaces: refactor

interfaces/05-log-parser/refactor-notes/refactor-03/parser.go

@@ -0,0 +1,48 @@
+// 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 main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+// pipeline determines the behavior of log processing
+type pipeline struct {
+}
+
+// pipe the log lines through funcs and produce a result
+func pipe(opts pipeline) ([]result, error) {
+	var (
+		l   = 1
+		in  = bufio.NewScanner(os.Stdin)
+		sum = make(map[string]result)
+	)
+
+	// parse the log lines
+	for in.Scan() {
+		r, err := parseResult(in.Text())
+		if err != nil {
+			return nil, fmt.Errorf("line %d: %v", l, err)
+		}
+
+		l++
+
+		// group the log lines by domain
+		sum[r.domain] = addResult(r, sum[r.domain])
+	}
+
+	// collect the grouped results
+	res := make([]result, 0, len(sum))
+	for _, r := range sum {
+		res = append(res, r)
+	}
+
+	return res, in.Err()
+}