Payload retries #2999
Payload retries #2999
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| // but maybe this is leaking information to the users? But it also might be good | ||
| // to allow that? Think about this harder maybe ask app sec about if this is an okay | ||
| // design choice |
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We always want to return the original encoded value if decoding fails
| {:then decoded} | ||
| {@render children(decoded)} | ||
| {:catch err} | ||
| {@render error?.(() => decodePayloads(value), err)} |
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This... confuses me?
So you'd pass something like
{#snippet error(retry, err)}
{#await retry} ...
{:catch}
{err}
{/await}
{/snippet}
| {#await decodeValuePromise} | ||
| {@render loading?.(keyedValue)} | ||
| {:then decoded} | ||
| {@render children(decoded)} | ||
| {:catch err} | ||
| {@render error?.(() => decodePayloads(value), err)} | ||
| {/await} |
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Claude finished @Alex-Tideman's task —— View job
Explanation of line 105
The code at line 105 (actually the entire block from lines 99-105) is using Svelte 5's {#await} block syntax to handle the asynchronous decoding operation. Here's what's happening:
The Pattern:
{#await decodeValuePromise}
{@render loading?.(keyedValue)}
{:then decoded}
{@render children(decoded)}
{:catch err}
{@render error?.(() => decodePayloads(value), err)}
{/await}Breaking it down:
-
Line 99-100 (Pending state): While
decodeValuePromiseis still loading, it renders theloadingsnippet, passing the originalkeyedValue(the stringified unencoded value) -
Line 101-102 (Success state): When the promise resolves successfully, it renders the
childrensnippet with thedecodedvalue -
Line 103-104 (Error state): If decoding fails, it renders the
errorsnippet with two parameters:- First param: A retry function
() => decodePayloads(value)- This is an arrow function that, when called, will re-attempt the decode operation - Second param: The error object
err
- First param: A retry function
Why pass a function instead of calling it?
The key insight is that line 104 passes () => decodePayloads(value) (a function) rather than calling it immediately. This gives control to the error snippet to decide when to retry. The default errorSnip (lines 93-97) calls this function when the user clicks the "Retry Decoding" button:
{#snippet errorSnip(retry, error)}
<div>{error}</div>
<Button on:click={retry}>Retry Decoding</Button>
{/snippet}This pattern allows consumers to provide their own error UI with custom retry behavior while keeping the retry logic (calling decodePayloads) encapsulated in the component.
Description & motivation 💭
Screenshots (if applicable) 📸
Design Considerations 🎨
Testing 🧪
How was this tested 👻
Steps for others to test: 🚶🏽♂️🚶🏽♀️
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Draft Checklist
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Issue(s) closed
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Any docs updates needed?