| 1 | package provider |
| 2 | |
| 3 | import ( |
| 4 | "errors" |
| 5 | "reflect" |
| 6 | |
| 7 | "golang.org/x/net/http2" |
| 8 | ) |
| 9 | |
| 10 | // HTTP2TransportCode classifies typed transport evidence without authorizing |
| 11 | // retries. API response bodies and arbitrary error wording are not evidence. |
| 12 | func HTTP2TransportCode(err error) string { |
| 13 | var response *APIError |
| 14 | if errors.As(err, &response) { |
| 15 | return "" |
| 16 | } |
| 17 | var connection http2.ConnectionError |
| 18 | var stream http2.StreamError |
| 19 | var goAway http2.GoAwayError |
| 20 | var connectionPtr *http2.ConnectionError |
| 21 | var streamPtr *http2.StreamError |
| 22 | var goAwayPtr *http2.GoAwayError |
| 23 | switch { |
| 24 | case errors.As(err, &connection): |
| 25 | return http2CodeName(uint64(connection)) |
| 26 | case errors.As(err, &stream): |
| 27 | return http2CodeName(uint64(stream.Code)) |
| 28 | case errors.As(err, &goAway): |
| 29 | return http2CodeName(uint64(goAway.ErrCode)) |
| 30 | case errors.As(err, &connectionPtr) && connectionPtr != nil: |
| 31 | return http2CodeName(uint64(*connectionPtr)) |
| 32 | case errors.As(err, &streamPtr) && streamPtr != nil: |
| 33 | return http2CodeName(uint64(streamPtr.Code)) |
| 34 | case errors.As(err, &goAwayPtr) && goAwayPtr != nil: |
| 35 | return http2CodeName(uint64(goAwayPtr.ErrCode)) |
| 36 | default: |
| 37 | return bundledHTTP2Code(err) |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | func http2CodeName(code uint64) string { |
| 42 | if code > uint64(http2.ErrCodeHTTP11Required) { |
| 43 | return "" |
| 44 | } |
| 45 | return http2.ErrCode(code).String() |
| 46 | } |
| 47 | |
| 48 | // net/http bundles private equivalents of x/net's types. Inspect only those |
| 49 | // exact package/type identities and uint32 fields; unknown layouts fail closed. |
| 50 | // Real TLS fixtures guard this adapter against Go toolchain changes. |
| 51 | func bundledHTTP2Code(err error) string { |
| 52 | if err == nil { |
| 53 | return "" |
| 54 | } |
| 55 | v := reflect.ValueOf(err) |
| 56 | if v.Kind() == reflect.Pointer && !v.IsNil() { |
| 57 | v = v.Elem() |
| 58 | } |
| 59 | if v.Type().PkgPath() == "net/http" { |
| 60 | switch v.Type().Name() { |
| 61 | case "http2ConnectionError": |
| 62 | if v.Kind() == reflect.Uint32 { |
| 63 | return http2CodeName(v.Uint()) |
| 64 | } |
| 65 | case "http2StreamError": |
| 66 | return bundledHTTP2Field(v, "Code") |
| 67 | case "http2GoAwayError": |
| 68 | return bundledHTTP2Field(v, "ErrCode") |
| 69 | } |
| 70 | } |
| 71 | if joined, ok := err.(interface{ Unwrap() []error }); ok { |
| 72 | for _, cause := range joined.Unwrap() { |
| 73 | if code := bundledHTTP2Code(cause); code != "" { |
| 74 | return code |
| 75 | } |
| 76 | } |
| 77 | return "" |
| 78 | } |
| 79 | return bundledHTTP2Code(errors.Unwrap(err)) |
| 80 | } |
| 81 | |
| 82 | func bundledHTTP2Field(v reflect.Value, name string) string { |
| 83 | if v.Kind() != reflect.Struct { |
| 84 | return "" |
| 85 | } |
| 86 | field := v.FieldByName(name) |
| 87 | if field.IsValid() && field.Kind() == reflect.Uint32 { |
| 88 | return http2CodeName(field.Uint()) |
| 89 | } |
| 90 | return "" |
| 91 | } |
| 92 |