|
| 1 | +package client |
| 2 | + |
| 3 | +import ( |
| 4 | + "net/http" |
| 5 | + "regexp" |
| 6 | + "strconv" |
| 7 | + "time" |
| 8 | + |
| 9 | + "github.com/hashicorp/go-retryablehttp" |
| 10 | +) |
| 11 | + |
| 12 | +var ( |
| 13 | + rateLimitResetHeaders = []string{ |
| 14 | + "x-organization-rate-limit-reset", |
| 15 | + "x-instant-test-rate-limit-reset", |
| 16 | + } |
| 17 | + resetHeaderPattern = regexp.MustCompile(`^\s*[0-9]+\s*$`) |
| 18 | + timeNow = time.Now |
| 19 | +) |
| 20 | + |
| 21 | +// Custom backoff function |
| 22 | +func thousandEyesBackoff(min, max time.Duration, attemptNum int, resp *http.Response) time.Duration { |
| 23 | + if resp == nil { |
| 24 | + return 0 |
| 25 | + } |
| 26 | + |
| 27 | + if resp.StatusCode == http.StatusTooManyRequests || resp.StatusCode == http.StatusServiceUnavailable { |
| 28 | + if sleep, ok := parseRetryAfterHeader(resp.Header["Retry-After"]); ok { |
| 29 | + return sleep |
| 30 | + } |
| 31 | + } |
| 32 | + |
| 33 | + for _, header := range rateLimitResetHeaders { |
| 34 | + if resetTimeStr := resp.Header.Get(header); resetTimeStr != "" { |
| 35 | + if sleep, ok := parseResetHeader(&resetTimeStr); ok { |
| 36 | + return sleep |
| 37 | + } |
| 38 | + |
| 39 | + // Default backoff if no valid reset time is found |
| 40 | + return retryablehttp.DefaultBackoff(min, max, attemptNum, resp) |
| 41 | + } |
| 42 | + } |
| 43 | + |
| 44 | + // Default case for no Retry-After and rateLimitResetHeaders |
| 45 | + return retryablehttp.DefaultBackoff(min, max, attemptNum, resp) |
| 46 | +} |
| 47 | + |
| 48 | +func parseRetryAfterHeader(headers []string) (time.Duration, bool) { |
| 49 | + if len(headers) == 0 || headers[0] == "" { |
| 50 | + return 0, false |
| 51 | + } |
| 52 | + header := headers[0] |
| 53 | + // Retry-After: 120 |
| 54 | + if sleep, err := strconv.ParseInt(header, 10, 64); err == nil { |
| 55 | + if sleep < 0 { // a negative sleep doesn't make sense |
| 56 | + return 0, false |
| 57 | + } |
| 58 | + return time.Second * time.Duration(sleep), true |
| 59 | + } |
| 60 | + |
| 61 | + // Retry-After: Fri, 31 Dec 1999 23:59:59 GMT |
| 62 | + retryTime, err := time.Parse(time.RFC1123, header) |
| 63 | + if err != nil { |
| 64 | + return 0, false |
| 65 | + } |
| 66 | + if until := retryTime.Sub(timeNow()); until > 0 { |
| 67 | + return until, true |
| 68 | + } |
| 69 | + // date is in the past |
| 70 | + return 0, true |
| 71 | +} |
| 72 | + |
| 73 | +// Function to parse the reset header |
| 74 | +func parseResetHeader(value *string) (time.Duration, bool) { |
| 75 | + if value == nil || !resetHeaderPattern.MatchString(*value) { |
| 76 | + return 0, false |
| 77 | + } |
| 78 | + |
| 79 | + // Parse the header value to a Unix timestamp |
| 80 | + resetTimeUnix, err := strconv.ParseInt(*value, 10, 64) |
| 81 | + if err != nil { |
| 82 | + return 0, false |
| 83 | + } |
| 84 | + |
| 85 | + // Calculate the duration until the reset time |
| 86 | + resetTime := time.Unix(resetTimeUnix, 0) |
| 87 | + waitDuration := time.Until(resetTime) |
| 88 | + |
| 89 | + // Return 0 if the reset time has already passed |
| 90 | + if waitDuration < 0 { |
| 91 | + return 0, true |
| 92 | + } |
| 93 | + return waitDuration, true |
| 94 | +} |
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