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Jul 24, 2025
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Cadence WG updates #1610

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Cadence WG updates
j1010001 Jul 24, 2025
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typo fix
j1010001 Jul 24, 2025
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95 changes: 81 additions & 14 deletions agendas/2025/sprint-kickoff/Flow-Sprint-Kickoff-07-25-2025.md
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Expand Up @@ -3,6 +3,10 @@
### Team Wins 🎉

* React SDK is live with components
* Cadence compiler + VM - basically no features left to support, started testing user Tx execution, testing execution correctness of book-keeping functions passed verification of 115K blocks.
* Badger -> Pebble migration - all node types being tested on testnet right now - very promising results so far! CPU spikes are gone, memory usage dropped from ~50% to under 10% (we need to wait longer to verify it is stable).
* EVM Gateway - completed work to increase TPS for high-traffic accounts & optimized key release logic to reduce the time the key becomes available.
* Network stress testing - loader improvements made it possible to sustain 300TPS load for 3 hours, promising collection thsize throttling results.

---

Expand Down Expand Up @@ -84,35 +88,98 @@ Q2 2025 Cycle Objective(s):

**Cadence Language**

- Compiler / VM Testing:

- Improving AI understanding of Cadence:

- Bugfix

- [Compiler Milestone 11 - Execution of user transactions](https://github.com/onflow/cadence/issues/4059)
- [[Compiler] Enable more tests to be run with VM](https://github.com/onflow/cadence/pull/4085)
- [[Compiler] Fix second-value assignment for index-expressions](https://github.com/onflow/cadence/pull/4088)
- [[Compiler] Fix expression evaluation order of second value assignments](https://github.com/onflow/cadence/pull/4090)
- [[Compiler] Transaction pre/post conditions are already executed](https://github.com/onflow/cadence/pull/4094)
- [[Compiler] Enable computation metering / limiting tests to be run with compiler/VM](https://github.com/onflow/cadence/pull/4095)
- [[Compiler] Fix `TestRuntimeWrappedErrorHandling` when running with VM](https://github.com/onflow/cadence/pull/4093)
- [[Compiler] Fix contract deployment / initialization](https://github.com/onflow/cadence/pull/4092)
- [Interpreter: Evaluate and transfer invocation, array, and dictionary arguments immediately](https://github.com/onflow/cadence/pull/4089)
- [[Compiler] Enable contract update program caching test for VM](https://github.com/onflow/cadence/pull/4098)
- [Rework test to actual feature: checking return value type](https://github.com/onflow/cadence/pull/4091)
- [[Compiler] Update and enable test checking GetOrLoadProgram hits for VM](https://github.com/onflow/cadence/pull/4096)
- [[Compiler] Test construction of InclusiveRange with VM, resolve TODO](https://github.com/onflow/cadence/pull/4099)
- [[Compiler] Create an implicit reference for self variable](https://github.com/onflow/cadence/pull/4097)
- [[Compiler] Implement Context.RecoverErrors in VM](https://github.com/onflow/cadence/pull/4101)
- [[Compiler] Enable storage reference bound function tests](https://github.com/onflow/cadence/pull/4102)
- [[Compiler] Enable memory metering tests to be run with compiler/VM](https://github.com/onflow/cadence/pull/4100)
- [[Compiler] Add corresponding VM tests for missing interpreter test](https://github.com/onflow/cadence/pull/4106)
- [[Compiler] Run more tests with compiler/VM](https://github.com/onflow/cadence/pull/4109)
- [[Compiler] Fix optional binding expression evaluation order](https://github.com/onflow/cadence/pull/4110)
- [[Compiler] Fix compilation of for loops over non-reference array with reference values](https://github.com/onflow/cadence/pull/4114)
- [[Compiler] Create `SimpleCompositeValue`s for transactions](https://github.com/onflow/cadence/pull/4116)
- [Improve event emission](https://github.com/onflow/cadence/pull/4117)
- [[Compiler] Fix optional chaining in compiler](https://github.com/onflow/cadence/pull/4118)
- [Add a new tool to decode a single slab](https://github.com/onflow/cadence/pull/4119)
- [Compiler Milestone X - remaining known gaps](https://github.com/onflow/cadence/issues/3804)
- [Clean up test utils](https://github.com/onflow/cadence/pull/4084)
- [[Compiler] Refactor function invocation](https://github.com/onflow/cadence/pull/4103)
- [[Compiler] Pass the receiver separately to the builtin functions](https://github.com/onflow/cadence/pull/4104)
- [[Compiler] Fix external invocations of bound functions](https://github.com/onflow/cadence/pull/4105)
- [[Compiler] Remove outdated todo's in VM](https://github.com/onflow/cadence/pull/4113)
- [Fix Array.map and Array.filter](https://github.com/onflow/cadence/pull/4115)
- [[Compiler] Improve naming and meter UUID field and value creation in VM](https://github.com/onflow/cadence/pull/4120)
- tech-debt removal
- [Remove unused error](https://github.com/onflow/cadence/pull/4112)

**Cadence Execution**
- [Callback scheduler](https://github.com/onflow/flow-core-contracts/pull/485)
- Enabling Cadence VM: [Implement EVM functionality for Cadence VM](https://github.com/onflow/flow-go/pull/7559)
- Atree improvement: [Refactor to modernize and reduce code](https://github.com/onflow/atree/pull/557)

- Badger -> Pebble migration
- [[Storage] Use lockctx to store approvals](https://github.com/onflow/flow-go/pull/7406)
- TPS loader improvements - network stress testing
- [Use finalised block as reference block](https://github.com/onflow/flow-execution-effort-estimation/pull/60)
- [Change transaction expiry](https://github.com/onflow/flow-execution-effort-estimation/pull/62)
- [Retry on not executed error](https://github.com/onflow/flow-execution-effort-estimation/pull/63)
- [Allow multiple access nodes](https://github.com/onflow/flow-execution-effort-estimation/pull/64)
- [Fix bug when streaming from multiple ANs](https://github.com/onflow/flow-execution-effort-estimation/pull/66)
- [Revert "allow multiple access nodes"](https://github.com/onflow/flow-execution-effort-estimation/pull/67)
- [Retry account creation and update metrics](https://github.com/onflow/flow-execution-effort-estimation/pull/65)
- [Fix retry on get tx to short](https://github.com/onflow/flow-execution-effort-estimation/pull/69)
- [Tweak TX expiry handling](https://github.com/onflow/flow-execution-effort-estimation/pull/70)
- Tech-debt
- [[Storage] Optimize the IterFunction](https://github.com/onflow/flow-go/pull/7582)
- CBOR Improvement
- [Add TimeRFC3339NanoUTC option for encoding to CBOR time](https://github.com/fxamacker/cbor/issues/687)

**Flow EVM**
-

- [Integrate JSON-RPC API specification changes from Geth releases](https://github.com/onflow/flow-evm-gateway/issues/840)
- [Remove `totalDifficulty` field from `Block` type](https://github.com/onflow/flow-evm-gateway/pull/847]
- Bugfix:
- [Fix endpoint crashes due to non-replay protected EVM transactions](https://github.com/onflow/flow-evm-gateway/pull/846)
- [Problem when calculating tx's fee based on EIP-1559](https://github.com/onflow/flow-evm-gateway/issues/748)
- Improvements:
- [Improve release frequency for signing keys](https://github.com/onflow/flow-evm-gateway/pull/842)
- [Improve release frequency of signing keys for soft-finality](https://github.com/onflow/flow-evm-gateway/pull/850)
- [Add metric for the total number of dropped EVM transactions](https://github.com/onflow/flow-evm-gateway/pull/837)
- [Add metric to count the number of rate-limited transactions](https://github.com/onflow/flow-evm-gateway/pull/839)
- Chores:
- [Sync soft-finality with changes from `main` branch](https://github.com/onflow/flow-evm-gateway/pull/843)
- [Sync soft-finality branch with changes from main](https://github.com/onflow/flow-evm-gateway/pull/848)
- [Run Go modernize tool to simplify code-base](https://github.com/onflow/flow-evm-gateway/pull/844)


**This sprint**

- Cadence Language

- Continue [Compiler Milestone 11 - Execution of user transactions](https://github.com/onflow/cadence/issues/4059).
- Support any changes need to improve AI use of Cadence language server (reviewing / updating errors).
- Maybe start [Metering optimization](https://github.com/onflow/cadence/issues/4058).

- Cadence Execution

- Continue work on Badger -> Pebble DB [M4: remove dependency on Badger DB completely from ENs and ANs](https://github.com/onflow/flow-go/issues/7265).
- Continue [Execution Effort Calibration](https://github.com/onflow/flow-go/issues/5598).
- Continue [Scheduled callbacks](https://github.com/onflow/flow-go/issues/7482).

- EVM


- Continue: [Integrate JSON-RPC API specification changes from Geth releases](https://github.com/onflow/flow-evm-gateway/issues/840)
- Start EVM GW resilience improvements[1](https://github.com/onflow/flow-evm-gateway/issues/764), [2](https://github.com/onflow/flow-evm-gateway/issues/778)

**On Hold**
- New Trie research
- [EOA control delegation](https://github.com/onflow/flow-go/issues/7441).
- [Migration of EN version beacon to Dyn. Prot. State](https://github.com/onflow/flow-go/issues/6788)
- [Adding support for lazy decoding of registers](https://github.com/onflow/atree/issues/341)
- [Provide immutable settings for each CCF format](https://github.com/onflow/cadence/issues/3448)
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