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| // Available variables: | |
| // - Machine | |
| // - interpret | |
| // - assign | |
| // - send | |
| // - sendParent | |
| // - spawn | |
| // - raise | |
| // - actions | |
| // - XState (all XState exports) | |
| // We should move the defaults in (if possible, delays and guards), but only if this helps readability | |
| // We should know how to get / override arguments (maxRetries, time??, see useQuery). Some are needed and some have a default | |
| // We should remove resolve / reject and just pass a Promise as argument | |
| // We should have a real exponential backoff algo | |
| // We should allow cancellation? | |
| // Maybe START / PAUSE events? | |
| const fetchMachine = Machine({ | |
| id: 'linear_backoff', | |
| initial: 'idle', | |
| context: { | |
| attempts: 0 | |
| }, | |
| states: { | |
| idle: { | |
| on: { '': [ | |
| { target: 'loading', cond: 'canRetry'}, | |
| { target: 'failure' } | |
| ]} | |
| }, | |
| loading: { | |
| invoke: { | |
| id: 'getUser', | |
| src: (context, event) => new Promise((_, reject) => reject("rejected")), | |
| onDone: { | |
| target: 'success', | |
| actions: assign({ user: (context, event) => event.data }) | |
| }, | |
| onError: { | |
| target: 'wait', | |
| actions: [assign({ error: (context, event) => event.data }), | |
| assign({ | |
| attempts: (context, event) => context.attempts + 1 | |
| }) | |
| ] | |
| } | |
| } | |
| }, | |
| success: { | |
| type: 'final' | |
| }, | |
| failure: { | |
| type: 'final' | |
| }, | |
| wait: { | |
| after: { | |
| LINEAR_DELAY: { | |
| target: 'idle', | |
| } | |
| } | |
| } | |
| } | |
| }, { | |
| delays: { | |
| LINEAR_DELAY: (context, event) => { | |
| return (context.attempts + 1) * 500; | |
| }, | |
| }, | |
| guards: { | |
| canRetry: (context, event) => { | |
| return context.attempts < 5; | |
| } | |
| } | |
| }); | |
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