Return an error when scheduling a reducer with a long delay #77
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Prior to this commit, it was possible for a module to crash SpacetimeDB by scheduling a reducer with a delay longer than ~2yrs. This was due to our use of `tokio_utils::time::DelayQueue` to handle scheduling. `DelayQueue`'s internal data structure imposes a limit of 64^6 ms on delays, a little more than two years. Attempting to insert with a delay longer than that panics. With this commit, we avoid the panic by checking ourselves that the requested delay is not longer than 64^6 ms. This requires bubbling a `ScheduleError` up from `Scheduler::schedule` to `WasmInstanceEnv::schedule`, where it is converted into a `RuntimeError` which crashes the module. `Scheduler::schedule` could also fail because its transaction to compute a new id was fallible. This seems unlikely to ever fail, and if it does, we have bigger problems, so `unwrap`ping might still be reasonable for that case, but this commit converts it into a handle-able `Err`or anyway, as there's essentially no cost in complexity to doing so.
jdetter
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Jul 13, 2023
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Tested, SpacetimeDB no longer crashes. We don't really get a meaningful error in the case of using spacetime call from the command line:
Error: Response text: The Wasm instance encountered a fatal error.
Caused by:
HTTP status server error (530 <unknown status code>) for url (http://localhost:3000/database/call/93dda09db9a56d8fa6c024d843e805d8/test)
And also it appears that the module logs are empty. I think this error is going to be extremely uncommon so this is fine for now.
cloutiertyler
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Prior to this commit, it was possible for a module to crash SpacetimeDB by scheduling a reducer with a delay longer than ~2yrs. This was due to our use of `tokio_utils::time::DelayQueue` to handle scheduling. `DelayQueue`'s internal data structure imposes a limit of 64^6 ms on delays, a little more than two years. Attempting to insert with a delay longer than that panics. With this commit, we avoid the panic by checking ourselves that the requested delay is not longer than 64^6 ms. This requires bubbling a `ScheduleError` up from `Scheduler::schedule` to `WasmInstanceEnv::schedule`, where it is converted into a `RuntimeError` which crashes the module. `Scheduler::schedule` could also fail because its transaction to compute a new id was fallible. This seems unlikely to ever fail, and if it does, we have bigger problems, so `unwrap`ping might still be reasonable for that case, but this commit converts it into a handle-able `Err`or anyway, as there's essentially no cost in complexity to doing so.
cloutiertyler
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Aug 1, 2023
Prior to this commit, it was possible for a module to crash SpacetimeDB by scheduling a reducer with a delay longer than ~2yrs. This was due to our use of `tokio_utils::time::DelayQueue` to handle scheduling. `DelayQueue`'s internal data structure imposes a limit of 64^6 ms on delays, a little more than two years. Attempting to insert with a delay longer than that panics. With this commit, we avoid the panic by checking ourselves that the requested delay is not longer than 64^6 ms. This requires bubbling a `ScheduleError` up from `Scheduler::schedule` to `WasmInstanceEnv::schedule`, where it is converted into a `RuntimeError` which crashes the module. `Scheduler::schedule` could also fail because its transaction to compute a new id was fallible. This seems unlikely to ever fail, and if it does, we have bigger problems, so `unwrap`ping might still be reasonable for that case, but this commit converts it into a handle-able `Err`or anyway, as there's essentially no cost in complexity to doing so.
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* Lint script * modernize: pnpm & prettier (#51) * Push * Push * Run prettier * Prettier stuff * modernize: Remove Husky & pre-commit (#53) * modernize: tsup (#54) * Push * jest * modernize: jest to vitest (#55) * modernize: pnpm workspace (#56) * Monorepo * Readme * Move tsconfig * Fix test * modernize: CRA -> Vite apps (#57) * Quickstart * test app too * Run pnpm * Remove eslint files * Format * modernize: ES2017 classes (#58) * modernize: in-house EventEmitter (#64) * Push * Undo min change * modernize: undici for WebSocket in Node (#59) * Use undici, remove other unneeded dependencies * pnpm install * Bundle everything * Move everything to devDependency * headers object * Bump version to 0.11.0 * Push * Hmm not working still * Add undici to peerDependencies * Measure size * Push * Fix formatting * Working on node!! --------- Co-authored-by: Zeke Foppa <github.com/bfops> Co-authored-by: Zeke Foppa <[email protected]> * modernize: Single output (#68) * modernize: quickstart, move server into client (#69) * Push * Run pnpm install * modernize: Engines field (#70) * modernize: Continuous Releases (#71) * Add pkg.pr.new * Fix directory * modernize: Changesets;provenance (#72) * Push * Push * pnpm install * Any update * modernize: Split lint and test GH actions (#73) * Push * Forgot to rename * We only care about Lint at commit level * modernize: pkg.pr.new compact mode (#75) * modernize: tweak prettier configuration (#74) * docs: Undici as peerDependency * modernize: webpackIgnore undici (#77) * Push * Webpackignore * modernize: Conditional browser build (#79) * Push * Remove webpackIgnore * fix: Remove obsolete comment * modernize: isolatedDeclarations;de-cyclic imports (#81) * Push * Fix test --------- Co-authored-by: Zeke Foppa <[email protected]>
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* Lint script * modernize: pnpm & prettier (#51) * Push * Push * Run prettier * Prettier stuff * modernize: Remove Husky & pre-commit (#53) * modernize: tsup (#54) * Push * jest * modernize: jest to vitest (#55) * modernize: pnpm workspace (#56) * Monorepo * Readme * Move tsconfig * Fix test * modernize: CRA -> Vite apps (#57) * Quickstart * test app too * Run pnpm * Remove eslint files * Format * modernize: ES2017 classes (#58) * modernize: in-house EventEmitter (#64) * Push * Undo min change * modernize: undici for WebSocket in Node (#59) * Use undici, remove other unneeded dependencies * pnpm install * Bundle everything * Move everything to devDependency * headers object * Bump version to 0.11.0 * Push * Hmm not working still * Add undici to peerDependencies * Measure size * Push * Fix formatting * Working on node!! --------- Co-authored-by: Zeke Foppa <github.com/bfops> Co-authored-by: Zeke Foppa <[email protected]> * modernize: Single output (#68) * modernize: quickstart, move server into client (#69) * Push * Run pnpm install * modernize: Engines field (#70) * modernize: Continuous Releases (#71) * Add pkg.pr.new * Fix directory * modernize: Changesets;provenance (#72) * Push * Push * pnpm install * Any update * modernize: Split lint and test GH actions (#73) * Push * Forgot to rename * We only care about Lint at commit level * modernize: pkg.pr.new compact mode (#75) * modernize: tweak prettier configuration (#74) * docs: Undici as peerDependency * modernize: webpackIgnore undici (#77) * Push * Webpackignore * modernize: Conditional browser build (#79) * Push * Remove webpackIgnore * fix: Remove obsolete comment * modernize: isolatedDeclarations;de-cyclic imports (#81) * Push * Fix test --------- Co-authored-by: Zeke Foppa <[email protected]>
bfops
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Description of Changes
Prior to this commit, it was possible for a module to crash SpacetimeDB by scheduling a reducer with a delay longer than ~2yrs. This was due to our use of
tokio_utils::time::DelayQueueto handle scheduling.DelayQueue's internal data structure imposes a limit of 64^6 ms on delays, a little more than two years.Attempting to insert with a delay longer than that panics.
With this commit, we avoid the panic by checking ourselves that the requested delay is not longer than 64^6 ms.
This requires bubbling a
ScheduleErrorup fromScheduler::scheduletoWasmInstanceEnv::schedule, where it is converted into aRuntimeErrorwhich crashes the module.Scheduler::schedulecould also fail because its transaction to compute a new id was fallible. This seems unlikely to ever fail, and if it does, we have bigger problems, sounwrapping might still be reasonable for that case, but this commit converts it into a handle-ableError anyway, as there's essentially no cost in complexity to doing so.API
If the API is breaking, please state below what will break