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docs: add check to atomic op in kv example #1147

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merged 6 commits into from
Nov 19, 2024
Merged

docs: add check to atomic op in kv example #1147

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a36ea4c
fix: add `check` to atomic op + error handling
adit-bala Nov 15, 2024
fb8db49
Merge branch 'main' into main
thisisjofrank Nov 16, 2024
480d198
fix: add `versionstamp` to enforce atomicity
adit-bala Nov 19, 2024
9b4e921
Merge branch 'main' of https://github.com/adit-bala/docs
adit-bala Nov 19, 2024
509caa1
deno fmt
adit-bala Nov 19, 2024
183e811
Merge branch 'main' into main
adit-bala Nov 19, 2024
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fix: add versionstamp to enforce atomicity
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@adit-bala
adit-bala committed Nov 19, 2024
commit 480d1989fd5eb825446c1d764d3c4ba1fad60a7a
12 changes: 11 additions & 1 deletion examples/kv.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -72,9 +72,19 @@ await kv.delete(["players", "carlos"]);
const aliceScoreKey = ["scores", "alice"];
await kv.set(aliceScoreKey, new Deno.KvU64(0n));


// To prepare an atomic transaction to update the score, first we need to
// check if the score has been modified since we read it. We can use the
// versionstamp to check if the value has been modified since we read it.
const aliceScoreEntry = await kv.get<Deno.KvU64>(aliceScoreKey);
const atomicCheck = {
key: aliceScoreEntry.key,
versionstamp: aliceScoreEntry.versionstamp,
};

// Add 10 to the player's score in an atomic transaction
const res = await kv.atomic()
.check({ key: aliceScoreKey, versionstamp: null }) // Check if this key has been modified since we read it
.check(atomicCheck)
.mutate({
type: "sum",
key: aliceScoreKey,
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