| 1 | export type KeyedResourceStatus = "idle" | "refreshing" | "error"; |
| 2 | |
| 3 | export type KeyedResource<T> = { |
| 4 | key: string | null; |
| 5 | data: T | null; |
| 6 | status: KeyedResourceStatus; |
| 7 | requestSeq: number; |
| 8 | revision: number; |
| 9 | error: string; |
| 10 | }; |
| 11 | |
| 12 | export function emptyKeyedResource<T>(): KeyedResource<T> { |
| 13 | return { key: null, data: null, status: "idle", requestSeq: 0, revision: 0, error: "" }; |
| 14 | } |
| 15 | |
| 16 | export function beginKeyedResourceRequest<T>( |
| 17 | current: KeyedResource<T>, |
| 18 | key: string, |
| 19 | requestSeq: number, |
| 20 | revision = current.revision, |
| 21 | ): KeyedResource<T> { |
| 22 | const sameKey = current.key === key; |
| 23 | return { |
| 24 | key, |
| 25 | data: sameKey ? current.data : null, |
| 26 | status: "refreshing", |
| 27 | requestSeq, |
| 28 | revision, |
| 29 | error: "", |
| 30 | }; |
| 31 | } |
| 32 | |
| 33 | export function resolveKeyedResourceRequest<T>( |
| 34 | current: KeyedResource<T>, |
| 35 | key: string, |
| 36 | requestSeq: number, |
| 37 | data: T, |
| 38 | revision = current.revision, |
| 39 | ): KeyedResource<T> { |
| 40 | if (current.key !== key || current.requestSeq !== requestSeq) return current; |
| 41 | return { ...current, data, status: "idle", revision, error: "" }; |
| 42 | } |
| 43 | |
| 44 | export function rejectKeyedResourceRequest<T>( |
| 45 | current: KeyedResource<T>, |
| 46 | key: string, |
| 47 | requestSeq: number, |
| 48 | error: string, |
| 49 | ): KeyedResource<T> { |
| 50 | if (current.key !== key || current.requestSeq !== requestSeq) return current; |
| 51 | return { ...current, status: "error", error }; |
| 52 | } |
| 53 |