Initialize module and dependencies

vendor/golang.org/x/telemetry/internal/upload/date.go

@@ -0,0 +1,85 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package upload
+
+import (
+	"fmt"
+	"os"
+	"sync"
+	"time"
+
+	"golang.org/x/telemetry/internal/counter"
+	"golang.org/x/telemetry/internal/telemetry"
+)
+
+// time and date handling
+
+var distantPast = 21 * 24 * time.Hour
+
+// reports that are too old (21 days) are not uploaded
+func (u *uploader) tooOld(date string, uploadStartTime time.Time) bool {
+	t, err := time.Parse(telemetry.DateOnly, date)
+	if err != nil {
+		u.logger.Printf("tooOld: %v", err)
+		return false
+	}
+	age := uploadStartTime.Sub(t)
+	return age > distantPast
+}
+
+// counterDateSpan parses the counter file named fname and returns the (begin,
+// end) span recorded in its metadata, or an error if this data could not be
+// extracted.
+func (u *uploader) counterDateSpan(fname string) (begin, end time.Time, _ error) {
+	parsed, err := u.parseCountFile(fname)
+	if err != nil {
+		return time.Time{}, time.Time{}, err
+	}
+	timeBegin, ok := parsed.Meta["TimeBegin"]
+	if !ok {
+		return time.Time{}, time.Time{}, fmt.Errorf("missing counter metadata for TimeBegin")
+	}
+	begin, err = time.Parse(time.RFC3339, timeBegin)
+	if err != nil {
+		return time.Time{}, time.Time{}, fmt.Errorf("failed to parse TimeBegin: %v", err)
+	}
+	timeEnd, ok := parsed.Meta["TimeEnd"]
+	if !ok {
+		return time.Time{}, time.Time{}, fmt.Errorf("missing counter metadata for TimeEnd")
+	}
+	end, err = time.Parse(time.RFC3339, timeEnd)
+	if err != nil {
+		return time.Time{}, time.Time{}, fmt.Errorf("failed to parse TimeEnd: %v", err)
+	}
+	return begin, end, nil
+}
+
+// avoid parsing count files multiple times
+type parsedCache struct {
+	mu sync.Mutex
+	m  map[string]*counter.File
+}
+
+func (u *uploader) parseCountFile(fname string) (*counter.File, error) {
+	u.cache.mu.Lock()
+	defer u.cache.mu.Unlock()
+	if u.cache.m == nil {
+		u.cache.m = make(map[string]*counter.File)
+	}
+	if f, ok := u.cache.m[fname]; ok {
+		return f, nil
+	}
+	buf, err := os.ReadFile(fname)
+	if err != nil {
+		return nil, fmt.Errorf("parse ReadFile: %v for %s", err, fname)
+	}
+	f, err := counter.Parse(fname, buf)
+	if err != nil {
+
+		return nil, fmt.Errorf("parse Parse: %v for %s", err, fname)
+	}
+	u.cache.m[fname] = f
+	return f, nil
+}