upload.go

Documentation: cmd/vendor/golang.org/x/telemetry/internal/upload

     1  // Copyright 2023 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package upload
     6  
     7  import (
     8  	"bytes"
     9  	"net/http"
    10  	"os"
    11  	"path/filepath"
    12  	"regexp"
    13  	"strings"
    14  	"time"
    15  )
    16  
    17  var (
    18  	dateRE     = regexp.MustCompile(`(\d\d\d\d-\d\d-\d\d)[.]json$`)
    19  	dateFormat = time.DateOnly
    20  	// TODO(rfindley): use dateFormat throughout.
    21  )
    22  
    23  // uploadReportDate returns the date component of the upload file name, or "" if the
    24  // date was unmatched.
    25  func (u *uploader) uploadReportDate(fname string) time.Time {
    26  	match := dateRE.FindStringSubmatch(fname)
    27  	if match == nil || len(match) < 2 {
    28  		u.logger.Printf("malformed report name: missing date: %q", filepath.Base(fname))
    29  		return time.Time{}
    30  	}
    31  	d, err := time.Parse(dateFormat, match[1])
    32  	if err != nil {
    33  		u.logger.Printf("malformed report name: bad date: %q", filepath.Base(fname))
    34  		return time.Time{}
    35  	}
    36  	return d
    37  }
    38  
    39  func (u *uploader) uploadReport(fname string) {
    40  	thisInstant := u.startTime
    41  	// TODO(rfindley): use uploadReportDate here, once we've done a gopls release.
    42  
    43  	// first make sure it is not in the future
    44  	today := thisInstant.Format(time.DateOnly)
    45  	match := dateRE.FindStringSubmatch(fname)
    46  	if match == nil || len(match) < 2 {
    47  		u.logger.Printf("Report name %q missing date", filepath.Base(fname))
    48  	} else if match[1] > today {
    49  		u.logger.Printf("Report date for %q is later than today (%s)", filepath.Base(fname), today)
    50  		return // report is in the future, which shouldn't happen
    51  	}
    52  	buf, err := os.ReadFile(fname)
    53  	if err != nil {
    54  		u.logger.Printf("%v reading %s", err, fname)
    55  		return
    56  	}
    57  	if u.uploadReportContents(fname, buf) {
    58  		// anything left to do?
    59  	}
    60  }
    61  
    62  // try to upload the report, 'true' if successful
    63  func (u *uploader) uploadReportContents(fname string, buf []byte) bool {
    64  	fdate := strings.TrimSuffix(filepath.Base(fname), ".json")
    65  	fdate = fdate[len(fdate)-len(time.DateOnly):]
    66  
    67  	newname := filepath.Join(u.dir.UploadDir(), fdate+".json")
    68  
    69  	// Lock the upload, to prevent duplicate uploads.
    70  	{
    71  		lockname := newname + ".lock"
    72  		lockfile, err := os.OpenFile(lockname, os.O_CREATE|os.O_EXCL, 0666)
    73  		if err != nil {
    74  			u.logger.Printf("Failed to acquire lock %s: %v", lockname, err)
    75  			return false
    76  		}
    77  		_ = lockfile.Close()
    78  		defer os.Remove(lockname)
    79  	}
    80  
    81  	if _, err := os.Stat(newname); err == nil {
    82  		// Another process uploaded but failed to clean up (or hasn't yet cleaned
    83  		// up). Ensure that cleanup occurs.
    84  		u.logger.Printf("After acquire: report already uploaded")
    85  		_ = os.Remove(fname)
    86  		return false
    87  	}
    88  
    89  	endpoint := u.uploadServerURL + "/" + fdate
    90  	b := bytes.NewReader(buf)
    91  	resp, err := http.Post(endpoint, "application/json", b)
    92  	if err != nil {
    93  		u.logger.Printf("Error upload %s to %s: %v", filepath.Base(fname), endpoint, err)
    94  		return false
    95  	}
    96  	// hope for a 200, remove file on a 4xx, otherwise it will be retried by another process
    97  	if resp.StatusCode != 200 {
    98  		u.logger.Printf("Failed to upload %s to %s: %s", filepath.Base(fname), endpoint, resp.Status)
    99  		if resp.StatusCode >= 400 && resp.StatusCode < 500 {
   100  			err := os.Remove(fname)
   101  			if err == nil {
   102  				u.logger.Printf("Removed local/%s", filepath.Base(fname))
   103  			} else {
   104  				u.logger.Printf("Error removing local/%s: %v", filepath.Base(fname), err)
   105  			}
   106  		}
   107  		return false
   108  	}
   109  	// Store a copy of the uploaded report in the uploaded directory.
   110  	if err := os.WriteFile(newname, buf, 0644); err == nil {
   111  		os.Remove(fname) // if it exists
   112  	}
   113  	u.logger.Printf("Uploaded %s to %q", fdate+".json", endpoint)
   114  	return true
   115  }
   116
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