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[FINAL] feat: wasm_memory_persistence option for canister upgrades #281
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Co-authored-by: Claudio Russo <claudio@dfinity.org>
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feat(IC-1635): Keep main memory on upgrade option Introducing a new upgrade option `wasm_memory_persistence` to retain the main memory on a canister upgrade. This is part of the required IC extension to support Motoko's enhanced orthogonal persistence (IC-1635, cf. dfinity/motoko#4225) and requires support for passive data segments (cf. https://gitlab.com/dfinity-lab/public/ic/-/merge_requests/17892). See dfinity/interface-spec#281 for the corresponding IC specification extension. Specific design aspects: * The option `wasm_memory_persistence` can be omitted for backwards compatibility. * A variant type has been chosen for `wasm_memory_persistence` to allow extendibility in the future, e.g. if multiple Wasm memories would be supported. * When set to `opt keep`, the upgrade retains both main memory and stable memory. Otherwise, the existing behavior of only retaining the stable memory and reinitializing the main memory is applied. * As a safety guard, programs with enhanced orthogonal persistence (i.e. Motoko) can add a custom section `enhanced-orthogonal-persistence` into the Wasm. When this is specified, the runtime system checks that the `wasm_memory_persistence` option is not omitted in error. This is to prevent accidental data loss for enhanced orthogonal persistence. Moreover, the system checks that `wasm_memory_persistence: opt keep` is only applied to canisters with enhanced orthogonal persistence. * For convenience, `drun` is adjusted to automatically apply `wasm_memory_persistence: opt keep` for canisters that have the `enhanced-orthogonal-persistence` section specified. See merge request dfinity-lab/public/ic!17893
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feat(IC-1635): Keep main memory on upgrade option Introducing a new upgrade option `wasm_memory_persistence` to retain the main memory on a canister upgrade. This is part of the required IC extension to support Motoko's enhanced orthogonal persistence (IC-1635, cf. dfinity/motoko#4225) and requires support for passive data segments (cf. https://gitlab.com/dfinity-lab/public/ic/-/merge_requests/17892). See dfinity/interface-spec#281 for the corresponding IC specification extension. Specific design aspects: * The option `wasm_memory_persistence` can be omitted for backwards compatibility. * A variant type has been chosen for `wasm_memory_persistence` to allow extendibility in the future, e.g. if multiple Wasm memories would be supported. * When set to `opt keep`, the upgrade retains both main memory and stable memory. Otherwise, the existing behavior of only retaining the stable memory and reinitializing the main memory is applied. * As a safety guard, programs with enhanced orthogonal persistence (i.e. Motoko) can add a custom section `enhanced-orthogonal-persistence` into the Wasm. When this is specified, the runtime system checks that the `wasm_memory_persistence` option is not omitted in error. This is to prevent accidental data loss for enhanced orthogonal persistence. Moreover, the system checks that `wasm_memory_persistence: opt keep` is only applied to canisters with enhanced orthogonal persistence. * For convenience, `drun` is adjusted to automatically apply `wasm_memory_persistence: opt keep` for canisters that have the `enhanced-orthogonal-persistence` section specified. See merge request dfinity-lab/public/ic!17893
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This PR adds an option (called
wasm_memory_persistence) for canister upgrades. If this option is set, then the WebAssembly memory of the old canister is preserved across the upgrade.