cloudflare/pint
Publicmirrored from https://github.com/cloudflare/pintAvailable
internal/promapi/errors.go
133lines · modecode
| 1 | package promapi |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "encoding/json" |
| 6 | "errors" |
| 7 | "fmt" |
| 8 | "log/slog" |
| 9 | "net" |
| 10 | "net/http" |
| 11 | "strings" |
| 12 | "syscall" |
| 13 | |
| 14 | v1 "github.com/prometheus/client_golang/api/prometheus/v1" |
| 15 | "github.com/prymitive/current" |
| 16 | ) |
| 17 | |
| 18 | func IsUnavailableError(err error) bool { |
| 19 | var e1 APIError |
| 20 | if ok := errors.As(err, &e1); ok { |
| 21 | return e1.ErrorType == v1.ErrServer |
| 22 | } |
| 23 | return true |
| 24 | } |
| 25 | |
| 26 | func IsQueryTooExpensive(err error) bool { |
| 27 | var e1 APIError |
| 28 | if ok := errors.As(err, &e1); ok { |
| 29 | if e1.ErrorType != v1.ErrExec { |
| 30 | return false |
| 31 | } |
| 32 | if strings.HasPrefix(e1.Err, "query processing would load too many samples into memory in ") { |
| 33 | return true |
| 34 | } |
| 35 | if strings.HasSuffix(e1.Err, "expanding series: context deadline exceeded") { |
| 36 | return true |
| 37 | } |
| 38 | } |
| 39 | return false |
| 40 | } |
| 41 | |
| 42 | type APIError struct { |
| 43 | Status string `json:"status"` |
| 44 | ErrorType v1.ErrorType `json:"errorType"` |
| 45 | Err string `json:"error"` |
| 46 | } |
| 47 | |
| 48 | func (e APIError) Error() string { |
| 49 | return e.Err |
| 50 | } |
| 51 | |
| 52 | const ( |
| 53 | ErrUnknown v1.ErrorType = "unknown" |
| 54 | ErrJSONStream v1.ErrorType = "json_stream" |
| 55 | ) |
| 56 | |
| 57 | func decodeErrorType(s string) v1.ErrorType { |
| 58 | switch s { |
| 59 | case string(v1.ErrBadData): |
| 60 | return v1.ErrBadData |
| 61 | case string(v1.ErrTimeout): |
| 62 | return v1.ErrTimeout |
| 63 | case string(v1.ErrCanceled): |
| 64 | return v1.ErrCanceled |
| 65 | case string(v1.ErrExec): |
| 66 | return v1.ErrExec |
| 67 | case string(v1.ErrBadResponse): |
| 68 | return v1.ErrBadResponse |
| 69 | case string(v1.ErrServer): |
| 70 | return v1.ErrServer |
| 71 | case string(v1.ErrClient): |
| 72 | return v1.ErrClient |
| 73 | default: |
| 74 | return ErrUnknown |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | const ( |
| 79 | errConnRefused = "connection refused" |
| 80 | errConnTimeout = "connection timeout" |
| 81 | ) |
| 82 | |
| 83 | func decodeError(err error) string { |
| 84 | if errors.Is(err, context.Canceled) { |
| 85 | return context.Canceled.Error() |
| 86 | } |
| 87 | |
| 88 | if errors.Is(err, syscall.ECONNREFUSED) { |
| 89 | return errConnRefused |
| 90 | } |
| 91 | |
| 92 | var neterr net.Error |
| 93 | if ok := errors.As(err, &neterr); ok && neterr.Timeout() { |
| 94 | return errConnTimeout |
| 95 | } |
| 96 | |
| 97 | var e1 APIError |
| 98 | if ok := errors.As(err, &e1); ok { |
| 99 | return fmt.Sprintf("%s: %s", e1.ErrorType, e1.Err) |
| 100 | } |
| 101 | |
| 102 | return err.Error() |
| 103 | } |
| 104 | |
| 105 | func tryDecodingAPIError(resp *http.Response) error { |
| 106 | slog.Debug("Trying to parse Prometheus error response", slog.Int("code", resp.StatusCode)) |
| 107 | |
| 108 | var status, errType, errText string |
| 109 | decoder := current.Object( |
| 110 | current.Key("status", current.Value(func(s string, _ bool) { |
| 111 | status = s |
| 112 | })), |
| 113 | current.Key("error", current.Value(func(s string, _ bool) { |
| 114 | errText = s |
| 115 | })), |
| 116 | current.Key("errorType", current.Value(func(s string, _ bool) { |
| 117 | errType = s |
| 118 | })), |
| 119 | ) |
| 120 | |
| 121 | dec := json.NewDecoder(resp.Body) |
| 122 | if err := decoder.Stream(dec); err != nil { |
| 123 | switch resp.StatusCode / 100 { |
| 124 | case 4: |
| 125 | return APIError{Status: "error", ErrorType: v1.ErrClient, Err: fmt.Sprintf("client error: %d", resp.StatusCode)} |
| 126 | case 5: |
| 127 | return APIError{Status: "error", ErrorType: v1.ErrServer, Err: fmt.Sprintf("server error: %d", resp.StatusCode)} |
| 128 | } |
| 129 | return APIError{Status: "error", ErrorType: v1.ErrBadResponse, Err: fmt.Sprintf("bad response code: %d", resp.StatusCode)} |
| 130 | } |
| 131 | |
| 132 | return APIError{Status: status, ErrorType: decodeErrorType(errType), Err: errText} |
| 133 | } |
| 134 | |