openai/openai-dotnet
Publicmirrored from https://github.com/openai/openai-dotnetAvailable
src/Utility/ServerSentEventField.cs
55lines · modecode
| 1 | using System; |
| 2 | |
| 3 | #nullable enable |
| 4 | |
| 5 | namespace OpenAI; |
| 6 | |
| 7 | /// <summary> |
| 8 | /// Represents a field that can be composed into an SSE event. |
| 9 | /// See SSE specification: https://html.spec.whatwg.org/multipage/server-sent-events.html |
| 10 | /// </summary> |
| 11 | internal readonly struct ServerSentEventField |
| 12 | { |
| 13 | private static readonly ReadOnlyMemory<char> s_eventFieldName = "event".AsMemory(); |
| 14 | private static readonly ReadOnlyMemory<char> s_dataFieldName = "data".AsMemory(); |
| 15 | private static readonly ReadOnlyMemory<char> s_lastEventIdFieldName = "id".AsMemory(); |
| 16 | private static readonly ReadOnlyMemory<char> s_retryFieldName = "retry".AsMemory(); |
| 17 | |
| 18 | public ServerSentEventFieldKind FieldType { get; } |
| 19 | |
| 20 | // Note: we don't plan to expose UTF16 publicly |
| 21 | public ReadOnlyMemory<char> Value { get; } |
| 22 | |
| 23 | internal ServerSentEventField(string line) |
| 24 | { |
| 25 | int colonIndex = line.AsSpan().IndexOf(':'); |
| 26 | |
| 27 | ReadOnlyMemory<char> fieldName = colonIndex < 0 ? |
| 28 | line.AsMemory() : |
| 29 | line.AsMemory(0, colonIndex); |
| 30 | |
| 31 | FieldType = fieldName.Span switch |
| 32 | { |
| 33 | var x when x.SequenceEqual(s_eventFieldName.Span) => ServerSentEventFieldKind.Event, |
| 34 | var x when x.SequenceEqual(s_dataFieldName.Span) => ServerSentEventFieldKind.Data, |
| 35 | var x when x.SequenceEqual(s_lastEventIdFieldName.Span) => ServerSentEventFieldKind.Id, |
| 36 | var x when x.SequenceEqual(s_retryFieldName.Span) => ServerSentEventFieldKind.Retry, |
| 37 | _ => ServerSentEventFieldKind.Ignore, |
| 38 | }; |
| 39 | |
| 40 | if (colonIndex < 0) |
| 41 | { |
| 42 | Value = ReadOnlyMemory<char>.Empty; |
| 43 | } |
| 44 | else |
| 45 | { |
| 46 | Value = line.AsMemory(colonIndex + 1); |
| 47 | |
| 48 | // Per spec, remove a leading space if present. |
| 49 | if (Value.Length > 0 && Value.Span[0] == ' ') |
| 50 | { |
| 51 | Value = Value.Slice(1); |
| 52 | } |
| 53 | } |
| 54 | } |
| 55 | } |
| 56 | |