ic-platform

Controlled Candid and executor dependencies. Enable candid for external protocol DTOs and bounded replies; enable executor for the selected CDK executor. ic_platform::Principal is unconditional; no features are enabled by default.

Enable icrc-ledger-types for ic_platform::icrc_ledger_types, selecting upstream 0.2.0 without default/storage features. The explicit flat surface is Account, MetadataValue, Value, ICRC3Value, TransferError, AllowanceArgs, Allowance, GetArchivesArgs, ICRC3ArchiveInfo, QueryArchiveFn, ArchivedBlocks, BlockWithId, GetBlocksRequest, GetBlocksResult, ICRC3DataCertificate and SupportedBlockType. These preserve upstream identities, external Candid formats, account/text semantics and value hashes. Select candid separately for Platform encoding/decoding; the ledger dependency itself brings transitive Candid. Native and Wasm are supported, without selecting an executor, parser, Agent or storage implementation. Consumers retain amount/fee policy, byte/work limits, ledger and archive admission, certificate verification, interpretation, deadlines and retries. Hashing a block or decoding certificate bytes does not authenticate either.

Enable management-canister-types for ic_platform::management_canister_types: upstream HttpRequestArgs, HttpRequestResult, HttpMethod, HttpHeader, TransformContext, TransformFunc and TransformArgs from exactly 0.11.0. The same feature explicitly exports Blob's history types: CanisterInfoArgs, CanisterInfoResult, ChangeDetails and CodeDeploymentMode. Backup's snapshot and status contract also exports CanisterIdRecord, CanisterStatusResult, CanisterStatusType, CanisterTimer, ChunkHash, DefiniteCanisterSettings, LoadCanisterSnapshotArgs, MemoryMetrics, OnLowWasmMemoryHookStatus, QueryStats, ReadCanisterSnapshotDataArgs, ReadCanisterSnapshotDataResult, ReadCanisterSnapshotMetadataArgs, ReadCanisterSnapshotMetadataResult, Snapshot, SnapshotDataKind, SnapshotDataOffset, SnapshotMetadataGlobal, SnapshotSource, StatusVisibility, TakeCanisterSnapshotArgs, UploadCanisterSnapshotDataArgs, UploadCanisterSnapshotMetadataArgs and UploadCanisterSnapshotMetadataResult. Canic's snapshot-delete request additionally uses the same feature's explicit DeleteCanisterSnapshotArgs export, with the original canister/snapshot fields. These retain the external Candid format and upstream type identity on native and Wasm targets. This feature brings transitive Candid; select Platform's candid feature separately for encoders/decoders. It selects no executor, Agent or parser. Consumers retain HTTP bounds, cycle pricing, transforms, call execution and retry policy. History consumers retain bounded calls, reply/work limits, change counts, instance-version checks and recovery fences. Decoding history does not establish continuity. Other management DTOs and call helpers are outside this explicit surface. Snapshot/status consumers retain target IDs, exact arity, controller/global/chunk bounds, reserved-marker refusal, journal evidence, finite spending and restore safety. These DTOs add no snapshot execution or storage/allocation owner. Upstream Reserved source payloads can consume skipping work: preserve zero-quota refusals and existing bounded projections instead of increasing quotas to decode a full DTO.

Enable agent on native hosts for ic_platform::agent: upstream Agent, AgentBuilder, AgentError, Identity, BasicIdentity, Secp256k1Identity, Prime256v1Identity, TransportError, HttpErrorPayload, Envelope, EnvelopeContent, SignedUpdate, RequestId, RequestStatusResponse, RejectCode, RejectResponse, ReplyResponse, lookup_value, to_request_id and signed_update_inspect, with PEM support. The module also exposes AnonymousIdentity, DelegatedIdentity, Delegation, SignedDelegation, CallResponse and TransportCallResponse. These retain upstream signed-chain validation and immediate/pending/rejected response formats. Unchecked delegation construction does not authenticate a chain or enforce expiry/target policy. Pending responses do not authorize polling or resubmission. The module and Agent dependency are absent on Wasm, including all-feature builds. No other Platform feature enables Agent, and Agent does not enable other Platform features. Its upstream Candid/certification dependencies remain transitive. Consumers own runtime, endpoint admission, TLS/client configuration, identity/root-key selection, query verification, byte limits, expiry, retries and durable effect policy. Use certification for certificate/hash-tree types, including SubtreeLookupResult and labeled_hash. Certificate lookup does not authenticate; signed-update inspection compares envelope fields without verifying signatures or authorizing replay. Existing Agent internal HTTP retries remain upstream.

ic_platform::candid::{DecodeLimits, DecodeError, decode_one, decode_args, decode_exactly_one} preserves Testkit's explicit limits and typed failures. decode_one and decode_args allow bounded skipping of additional arguments; decode_exactly_one requires one actual wire argument. All select compact Candid diagnostics, which are not a redaction guarantee. Callers retain raw bytes, aggregate accounting, trust, resource policy and domain errors.

Use ic_platform::candid::contract for Candid DTO derives and encoding. Add #[candid_path("ic_platform::candid::contract")] to derived types, and #[serde(crate = "ic_platform::candid::contract::serde")] when deriving Deserialize through the boundary's Serde export. These are external protocol types, not an application-wide requirement. Principal-only users import ic_platform::Principal without selecting a feature or declaring ic_principal directly. The root and Candid contract exports have the same upstream type identity.

ic_platform::PrincipalError is also unconditional and retains the upstream Principal parse-error identity used by public host APIs.

Use candid::decoder::{DecoderConfig, IDLDeserialize, decode_one_with_config, decode_args_with_config, decode_one, decode_args} for existing low-level configuration and staged decoding. These are direct upstream identities: optional/default ceilings, diagnostics, construction/value/finalization/drop boundaries and typed errors are unchanged. Callers retain pre-decoder byte admission and canonical re-encoding; the finite DecodeLimits helpers continue selecting compact diagnostics. The decoder module's decode_one and decode_args use upstream defaults, including diagnostics, and take no Platform DecodeLimits argument. Preserve existing caller byte admission; do not confuse them with the parent helpers.

The contract explicitly exports candid_method, export_service, Encode, Decode, TypeEnv, idl_hash, reflection/type equality/subtyping and printer machinery. It also exports DecoderConfig and decode_args_with_config with their original upstream identities for generated-code contracts. These preserve upstream defaults and selected configuration, independently of the finite-limit parent helpers. CDK 0.20.3 still hardcodes ::candid; these exports alone do not fix its macros. contract::types::subtype::subtype preserves upstream structural subtyping for narrowed reply projections; equality is a different relation. For service generation, write contract::export_service!(ic_platform::candid::contract); the upstream macro accepts this explicit generated path. Update generators too. Import contract::{Encode, Decode} by those names so their recursive macro calls resolve without a direct Candid crate. The candid feature selects upstream bignum and printer; it does not enable an executor or host parser.

Enable certification for ic_platform::certification: upstream Certificate, Delegation, HashTree, Label, LookupResult, empty, fork, labeled, leaf, pruned and fork_hash, with upstream Serde support. This feature is independent of Candid and the executor. Host retains its strict bounded CBOR decoder; consumers own trust roots, authentication, budgets and leaf meanings. Neither construction nor deserialization authenticates a certificate. This centralizes dependency control without removing upstream code or promising smaller Wasm artifacts.

Enable candid-parser on native hosts for ic_platform::candid_parser. It explicitly exports IDLProg, check_prog, TypeEnv, Type, TypeInner, FuncMode, Dec, IDLMergedProg, Error, Result, IDLArgs, parse_idl_args, CandidSource, instantiate_candid, service_equal, TypeContainer, type_equal, compile_javascript and compile_typescript. These retain upstream identities and semantics. The feature does not enable Platform's candid or executor; the upstream parser itself depends on Candid with full type/value support. On Wasm this module and parser dependency are absent even with all features. Callers own source/output limits, imports and diagnostics. check_prog ignores imports; inspect Dec first when requiring self-contained source. Parse IDLProg and call check_prog for silent in-memory checking. CandidSource::File reads files/imports; its loaders and service comparison can print parser diagnostics. Native refusal fixtures can also import IDLValue, IDLField, TypeSerialize and ValueSerializer from this module. Select candid too when using the contract's derives/reflection or configured decoders. These exports impose no automatic bounds and do not expose dynamic fixture APIs on Wasm.

The contract also exports ArgumentEncoder/ArgumentDecoder for generic call helpers, Nat/Int for arbitrary-precision external values, and Reserved for partial projections. The candid feature includes upstream big-number support. Use Result<T, contract::Error> for encoding errors and DecodeError for bounded decoding failures. Existing wire labels and caller-owned limits remain unchanged.

executor exports the exact selected task/context types and operations. It owns no independent task registry. Callers must preserve context placement, callbacks and trap cleanup; native compilation does not qualify installed IC behavior. Its published dependency constraint is ic-cdk-executor = "=2.0.0".

Enable ic0 for ic_platform::ic0: the explicit IC 1.2.0 calls used by Timers for time/version/counters/stable page count, one timer, self/caller/argument copying, replies/reject codes, cycles/costs and call submission/cleanup, plus Testkit's debug_print(&[u8]). Debug output retains upstream byte/trap behavior; marker formatting, labels and byte limits belong to the caller. The exact =1.2.0 dependency preserves upstream safe/unsafe callback signatures and traps. It selects neither Candid nor an executor and installs no exports, timer or storage owner. Timers must select both executor and ic0; changing either qualified identity requires renewed combined callback/trap/cancellation/upgrade evidence.

The same feature explicitly exports in_replicated_execution() -> u32, is_controller(&[u8]) -> u32, msg_reply_data_append(&[u8]) and msg_reject(&[u8]). These are the upstream safe signatures and integer results. Pass existing Principal bytes to the controller operation; append preserves slice order and still requires msg_reply() to finalize. Keep rejection bytes, early size refusal and authentication ordering unchanged. These exports do not replace CDK's Principal/Vec convenience helpers, macros or call/task lifecycle.

Until the full CDK frontend is qualified, existing canisters/probes may retain narrow direct ic-cdk 0.20.3 and macro-required Candid declarations for entrypoint, lifecycle, call/system and spawn APIs (runtime contract). Typed/default CDK expansion still emits absolute Candid paths. Re-exporting its macros or changing imports does not fix that expansion. CDK futures::spawn adds an unfinished-task drop panic outside trap recovery; executor::spawn_protected alone does not preserve that policy and must not replace it. Existing raw CDK 0.20.3 methods with zero Rust arguments, manual_reply = true and hidden = true avoid generated Candid references. hidden preserves callable exports but omits Candid service registration; retain supported DID metadata when required. This subset still uses direct CDK and is not a Platform runtime facade.

Published Testkit 0.52/0.53 call helpers still own distinct limits/error types. Existing native tests may retain ic-testkit-candid solely for that API until a published Testkit adopts Platform's identities and consumers qualify it (producer coordination). Do not add conversion/re-export packages or replacement simulator transport. CDK entrypoint macros and a full CDK call facade remain unsupported. Selected upstream dependencies remain transitive dependencies.