mirror of
https://github.com/go-vikunja/vikunja.git
synced 2026-05-01 09:26:38 +00:00
125 lines
3.6 KiB
Go
125 lines
3.6 KiB
Go
// Vikunja is a to-do list application to facilitate your life.
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// Copyright 2018-present Vikunja and contributors. All rights reserved.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package migration
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import (
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"bytes"
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"context"
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"crypto/rand"
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"fmt"
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"io"
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"math"
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"math/big"
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"net/http"
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"net/url"
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"strings"
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"time"
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)
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// DownloadFile downloads a file and returns its contents
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func DownloadFile(url string) (buf *bytes.Buffer, err error) {
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return DownloadFileWithHeaders(url, nil)
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}
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// DownloadFileWithHeaders downloads a file and allows you to pass in headers
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func DownloadFileWithHeaders(url string, headers http.Header) (buf *bytes.Buffer, err error) {
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req, err := http.NewRequestWithContext(context.Background(), http.MethodGet, url, nil)
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if err != nil {
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return nil, err
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}
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for key, h := range headers {
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for _, hh := range h {
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req.Header.Add(key, hh)
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}
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}
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hc := http.Client{}
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resp, err := hc.Do(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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buf = &bytes.Buffer{}
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_, err = buf.ReadFrom(resp.Body)
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return
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}
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// DoPost makes a form encoded post request
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func DoPost(url string, form url.Values) (resp *http.Response, err error) {
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return DoPostWithHeaders(url, form, map[string]string{})
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}
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// DoPostWithHeaders does an api request and allows to pass in arbitrary headers
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func DoPostWithHeaders(url string, form url.Values, headers map[string]string) (resp *http.Response, err error) {
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const maxRetries = 3
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const baseDelay = 100 * time.Millisecond
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hc := http.Client{}
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for attempt := 0; attempt < maxRetries; attempt++ {
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req, err := http.NewRequestWithContext(context.Background(), http.MethodPost, url, strings.NewReader(form.Encode()))
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if err != nil {
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return nil, err
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}
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req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
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for key, value := range headers {
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req.Header.Add(key, value)
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}
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resp, err = hc.Do(req)
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if err != nil {
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return nil, err
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}
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// Don't retry on non-5xx status codes
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if resp.StatusCode < 500 {
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return resp, nil
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}
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// Return error on last attempt if still getting 5xx
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if attempt == maxRetries-1 {
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bodyBytes, readErr := io.ReadAll(resp.Body)
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resp.Body.Close()
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// Re-create the body so the caller can still read it if needed
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resp.Body = io.NopCloser(bytes.NewBuffer(bodyBytes))
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if readErr != nil {
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return resp, fmt.Errorf("request failed after %d attempts with status code %d (could not read response body: %w)", maxRetries, resp.StatusCode, readErr)
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}
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return resp, fmt.Errorf("request failed after %d attempts with status code %d: %s", maxRetries, resp.StatusCode, string(bodyBytes))
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}
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// Close the body before retrying
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resp.Body.Close()
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// Exponential backoff with jitter
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delay := baseDelay * time.Duration(math.Pow(2, float64(attempt)))
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maxJitter := int64(delay / 2)
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jitterBig, _ := rand.Int(rand.Reader, big.NewInt(maxJitter))
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jitter := time.Duration(jitterBig.Int64())
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time.Sleep(delay + jitter)
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}
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return nil, fmt.Errorf("request failed after %d attempts", maxRetries)
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}
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