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feat(drive): compute what creating a document costs for the SDKs - #5159
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`drive::document::cost` prices a document create from the contract alone: the storage of every element the insert writes (exact: the elements the walkers build, priced with GroveDB's byte formulas, including a ranked index's secondary rows, preallocated trees and a ttl document's expiration entry), split by index into shared and own layers, under two scenarios (every index value new, every value already stored); the processing (the signature and identity fetch exact, the writes estimated for a number of stored documents, a ttl type's cleanup prepay); the contract's action fee, token cost and contest fund; and what a delete refunds. A document can be built from sizes rather than values (`sized_document`). wasm-sdk exposes it as `documentCreateCost(contract, documentTypeName, options, platformVersion)`, building rs-drive with `fee-distribution` for the refund. Shared helpers now also compile for `verify`, unchanged: the document reference builders, `index_only_member_key` and `bound_value_fits_referring_property` (moved), and the expiration module's pricing, paths and entry; `document_ttl_pricing` takes its per-byte price from the new `document_ttl_credit_per_byte`. A test requires the storage to equal what Drive charges on real inserts into 19 contracts, byte for byte. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. 📝 WalkthroughWalkthroughAdds a Drive document-creation cost estimator and a WASM/JavaScript ChangesDocument Creation Cost Estimation
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant JavaScriptCaller as JavaScript caller
participant documentCreateCost
participant document_type_create_cost
participant DocumentCreateCostJs
JavaScriptCaller->>documentCreateCost: contract, document type, options, platform version
documentCreateCost->>document_type_create_cost: field choices and cost assumptions
document_type_create_cost-->>documentCreateCost: document cost estimate
documentCreateCost-->>DocumentCreateCostJs: serialized WASM result
DocumentCreateCostJs-->>JavaScriptCaller: cost scenarios and breakdown
Suggested reviewers: Merge Risk: 🔵 Low · up to The new document-cost estimate may overstate deletion refunds for document types with ranked indexes. Actual fees are unaffected, so this can merge with a follow-up, though fixing it first would make the reported refunds accurate. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The new API calculates and returns estimates; the reviewed path does not submit documents or set the fees charged for them. Its main design risk is that callers may rely on estimates whose processing and conditional charges depend on assumptions. No material security issue was established, but review coverage is incomplete. Retained concerns Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 77.08% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 96 functions across 14 files. (4 skipped: 4 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
Review comments at @packages/rs-drive/src/drive/document/cost/mod.rs:
- Around line 489-495: Update the `PricedElement::Serialized` case in
`refundable_bytes` so ranking rows are excluded from refundable storage, using
`write.ranking` to identify them instead of relying only on `write.ephemeral`.
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📒 Files selected for processing (18)
book/src/SUMMARY.mdbook/src/fees/document-cost.mdpackages/js-evo-sdk/README.mdpackages/rs-drive/src/drive/document/cost/document.rspackages/rs-drive/src/drive/document/cost/grove_costs.rspackages/rs-drive/src/drive/document/cost/mod.rspackages/rs-drive/src/drive/document/cost/tests.rspackages/rs-drive/src/drive/document/cost/writes.rspackages/rs-drive/src/drive/document/expiration/mod.rspackages/rs-drive/src/drive/document/expiration/pricing.rspackages/rs-drive/src/drive/document/index_only.rspackages/rs-drive/src/drive/document/insert/add_preallocated_index_tree_operations/mod.rspackages/rs-drive/src/drive/document/layout.rspackages/rs-drive/src/drive/document/mod.rspackages/wasm-sdk/Cargo.tomlpackages/wasm-sdk/src/document_create_cost.rspackages/wasm-sdk/src/lib.rspackages/wasm-sdk/tests/unit/document-create-cost.spec.ts
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…t a delete refunds Review fixes for the document cost estimate: - The known-values scenario counts as new every tree keyed by the document's own id (a preallocated index's) with what is under it, and a ttl document's expiration entry. - The refund counts only elements carrying the owner's flags that a delete removes: not a ranked tree's rows, preallocated trees (kept on delete) or flagless items (each write now records its flags). - References under a time window with a ttl carry no flags, as Drive strips them; a new test covers such a window against a real insert. - The estimate refuses a platform version whose insert, reference, primary storage or expiration methods differ from those it mirrors, not only the index walkers. - The known-values processing counts a ranked row's move. - Transient fields are neither priced nor listed in `fields`. - The documentation says the storage is an uncontested create's (a contested value is stored in the vote poll, not priced) and when index trees carry flags. - Cleanups: the SDK value helpers and the 19 test contracts are shared with the layout (`sdk_value`, `fixture_contracts`); the document is serialized once; writes are deduplicated with a set; `platform_version` last in `fill`; no inline `crate::` paths; the processing test no longer skips failed inserts. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Pick up #5159 (compute what creating a document costs for the SDKs). Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
* docs: say what the example check runs: the parser, not the meta-schema @dashevo/evo-sdk is built without dpp's validation feature, so DataContract.fromJSON(json, true, 14) runs the contract parser but not the document meta-schema or the parser checks gated behind that feature. The README, the examples registry and the validation script claimed more. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * feat: show a document type's GroveDB layout, computed by Drive A "GroveDB layout" button in the inspector opens every tree and element Drive writes for the selected document type: the documents by id (and revisions), and for each index the property and value trees down to the [0] where it ends, with each layer's element (count, sum, ranked, ...), its zero-contribution wrapper, the indexes that use it, conditions (the null fallback of a unique index, skipIfAbsent, preallocated, time window overlap) and a link to that kind of layer in the GroveDB structure viewer. The layout comes from documentTypeLayout in @dashevo/evo-sdk (dashpay/platform#5153), so it follows Drive's own rules. It is feature-detected: with an SDK that predates it, the panel says so. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * test: refresh the layout fixtures from the merged documentTypeLayout dashpay/platform#5153 merged with a review fix: a unique index's null fallback no longer repeats the terminal's indexes and notes. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * feat: show what a document costs, in Dash and dollars, per index Selecting a document type shows about what one of its documents costs; Cost opens the breakdown, computed by Drive (documentCreateCost in @dashevo/evo-sdk, dashpay/platform#5159): the first document with a set of index values and a later one with the same values; the storage of the document itself and of each index on its own (the part it shares with other indexes, paid once, and its own); prepaid trees and a ttl type's expiration entry; the processing (exact parts marked, the rest estimated for a number of stored documents, a key type and a fee increase); the contract's action fee, token cost and contest fund; and the refund on delete. "Adjust the document" gives an on/off switch per optional field and a length per variable-size one; fixed-size fields need no input. The Dash price comes from CoinGecko (Coinbase if that fails), kept five minutes, and can be typed in. Feature-detected: with an SDK that predates documentCreateCost the inspector says so. The layout and cost loaders share one local SDK module. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Basic explanation
What this does: Creating a document costs credits: mostly storage (every byte the insert writes, 27,000 credits a byte), some processing, and whatever the contract adds (an action fee, a token cost, a contest's vote fund). Until now nobody could say what a document of a given type costs without inserting one on a node. This PR adds a function that computes it from the contract alone, with Drive's own rules:
document_create_costin rs-drive, exposed to JavaScript asdocumentCreateCost(contract, documentTypeName, options, platformVersion)in wasm-sdk, and so in@dashevo/evo-sdk. The contract visualizer uses it to show the cost of each document type in Dash and dollars.Value:
Risks: Low, and no consensus change.
verifybuild (the one wasm-sdk uses) can call them, unchanged: the document reference builders, the indexOnly member key, the preallocation width check, and the tier lookup ofdocument_ttl_pricing. The full rs-drive library suite passes.fee-distribution(for the refund), which addsrust_decimal: with the estimate, the compressed SDK is about 40 KB larger than the layout PR's build (12.80 MB to 12.84 MB).Issue being fixed or feature implemented
The contract visualizer needs to show what a document of each type costs, per index, in Dash and dollars, and let a reader refine it by the fields that matter. Drive's own fee estimation (
add_document_for_contractwithapply = false) needs GroveDB's RocksDB storage, so it cannot run in a browser.What was done?
drive::document::cost(new,serverorverify):document_create_cost(contract, document_type, document, assumptions, platform_version)anddocument_type_create_cost(.., choices, ..), which first builds a document of chosen sizes (sized_document).cost::writes), built with the functions the walkers use and shaped bydrive::document::layout: the document by id (or its revision tree withdocumentsKeepHistory); per index, the value trees, the[0]terminal and the reference or indexOnly entry; the rows a ranked index keeps in its secondary trees; the trees preallocated for other types'preallocatedindexes; attldocument's entry in the expirations tree. Storage flags follow the walkers: the document's elements carry them, index trees only when documents are mutable or deletable, none for attltype.cost::grove_costs), restated because grovedb-merk compiles them only with RocksDB: key bytes, item and layered value bytes, tree cost sizes, and the node feature and link bytes by the tree an element sits in. Tests pin each one to grovedb's own function.ttltype's cleanup prepay, exact; the fee increase.fee-distribution): the elements it removes that carry the owner's flags, not a ranked tree's rows or the preallocated trees a delete keeps.ttltype is priced by the lifetime tier (document_ttl_credit_per_byte), with its expiration entry and no refund.drive::document::sdk_value) and the 19 test contracts (drive::document::fixture_contracts).verifyas well, unchanged:make_document_reference,make_document_reference_with_sum_item,index_only_member_key(moved fromindex_only, re-exported there),bound_value_fits_referring_property(moved from the preallocation path), and theexpirationmodule'spricing,pathsandDocumentExpirationEntry(its other submodules stayserver).document_ttl_pricingnow takes its per-byte price from the newdocument_ttl_credit_per_byte.documentCreateCost(contract, documentTypeName, options?, platformVersion)withDocumentCreateCostandDocumentCreateCostOptionsTypeScript types:fields(per field,presentandlength),existingDocuments,signatureKeyType,userFeeIncrease,feeMultiplierPermille,contenders. Unknown option or field keys are refused. evo-sdk re-exports it.Before and after
documentCreateCost(contract, type, undefined, PlatformVersion.latest())for three bundled examples of the contract visualizer, each variable-size field at its middle size (1 DASH = 100,000,000,000 credits):domaintip(indexOnly, ranked, summed)listing(ttl, 24 overlapping time windows)For the listing, a later document costs slightly more than the first: its storage is cheap (priced by a month's lifetime), so processing dominates, and writing into existing trees rewrites a node more than creating them.
How Has This Been Tested?
cargo test -p drive --lib drive::document::cost: 13 tests.should_price_what_drive_charges: for each of 19 contracts fromtests/supporting_files(the onesdrive::document::layoutis held to), inserts 10 random documents per type, a document repeating the values of the one before, and the SDK's document of middle sizes, with the flags a create uses. Before each insert it reads from GroveDB which trees already exist; after it, each ranked value's aggregate. It requires the estimate to equal the storage fee Drive charged, exactly, for every insert. The first runs found the ranked rows, the rebilling of moved rows and the preallocated trees, which the estimate now models.should_price_a_document_with_a_ttl_by_its_lifetime: the same exact check for attltype, plus its cleanup prepay, its expiration entry counted with known values, and no refund.should_price_a_time_window_with_a_ttl_without_flags_as_processing: the references under a ttl'd window carry no flags, and the rest matches a real insert exactly.should_count_trees_keyed_by_the_document_id_as_new_and_unrefunded: a Yappr post's preallocated trees keyed by its id count with known values and are not refunded.should_estimate_the_processing_of_the_writes_within_a_factor_of_two: the writes' processing estimate against Drive's processing fee after 1, 10 and 100 documents in six contracts; a failed insert fails the test.should_split_the_storage_into_primary_storage_and_each_index,should_add_the_contract_charges(an action fee, the DPNS contest fund),should_charge_a_later_document_with_known_values_no_more_than_the_first(every type of the 19 contracts),should_refuse_an_earlier_protocol_version.grove_coststests pin the restated formulas to grovedb'sKVfunctions,TreeType::inner_node_typeandElement::specialized_costs_for_key_value, for every tree type.cargo test -p drive --lib: all pass.cargo clippy -p drive --all-targets,cargo clippy -p drive --no-default-features --features verify,cargo clippy -p wasm-sdk --target wasm32-unknown-unknown,cargo fmt --all -- --check: clean.yarn workspace @dashevo/wasm-sdk build, thenmocha tests/unit/document-create-cost.spec.ts: 6 passing (middle sizes, the index split, field lengths and presence, the action fee and processing by key type, attltype, unknown keys refused);eslintclean.Breaking Changes
None.
Checklist:
structure.rs, regeneratedgrovedb-structure.json, and checked the structure viewer link posted on this pull requestFor repository code-owners and collaborators only
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