fix: aggregation spec to use height instead of size #66

vasco-santos · 2023-07-17T12:15:24Z

Renames size to height for piece/aggregate based on described in storacha/data-segment#13

Note that:

given piece and aggregate are both perfect binary trees, leaf count of can be derived as 2 ** height, and the size of the tree can be derived by leafCount * Node.Size (32).

vasco-santos · 2023-07-17T12:17:03Z

w3-aggregation.md

 # https://github.com/filecoin-project/go-state-types/blob/1e6cf0d47cdda75383ef036fc2725d1cf51dbde8/abi/piece.go#L47-L50
+# Uses `height` field instead of `size`. `height` field can be used to derive `leafCount` and consequently `size`, while
+# allowing the usage of smaller numbers instead of `bigint`.
 type PieceInfo {


@Gozala by this change, I am considering to just rename PieceInfo to PieceProof instead.

Motivation would be to create a new name instead of relying on PieceInfo that is already known to have cid + size. We could just name it PieceProof and add comment saying it can be used to derive PieceInfo. What do you think?

IMO it's fine to leave as PieceInfo, the point is for this information to now be the "piece information" as we'd not materialize and pass around a size value unless for display.

I really don't want to call it a PieceProof as it can be confused with InclusionProof (in fact that's how it a appears in the go implementation).

If you want to rename perhaps call it a PieceDetail, personally I don't have strong feelings about the name. In fact it is a mistake that height is not part of the CID, but I'm not sure it's worth trying to fix that.

vasco-santos · 2023-07-17T12:17:32Z

w3-aggregation.md

@@ -132,7 +132,7 @@ A Storefront principal can invoke a capabilty to offer an aggregate that is read
      "offer": { "/": "bafy...many-cars" }, /* dag-cbor CID with offer content */
      "piece": {


should this be pieceProof or even just proof? See rationale on other review comment

Please lets not use term proof as we'll have inclusion proofs and ucans have their own proofs and it's going to get very confusing. I'm open to different name, but proof is just too confusing

Actually can we just call this an aggregate instead ? Alternatively we could change it all to

"pieces": { "/": "bafy...pieces" } // dag-cbor containing pieces "aggregate": { "/": "bafy...aggregate-cid" }, "height": 4 // height of the aggregate tree

Also it's kind of a mistake that height / size is not part of the CID itself.

@vasco-santos we should also check with spade team if they even need or care about the pieces here, I suspect they are not.

Actually can we just call this an aggregate instead ?

we previously went back from aggregate to piece given they by the end of the day are the same. Have height and cid, and perhaps in the future they could be encoded in the CID as you say.

alanshaw

LGTM - I think a minor clarification on "perfect" binary tree would help but I think the meaning is obvious so not a blocker.

alanshaw · 2023-07-17T14:55:33Z

w3-aggregation.md

@@ -132,7 +132,7 @@ A Storefront principal can invoke a capabilty to offer an aggregate that is read
      "offer": { "/": "bafy...many-cars" }, /* dag-cbor CID with offer content */
      "piece": {
        "link": { "/": "commitment...aggregate-proof" },
-        "size": 10102020203013342343
+        "height": 4 /* height of the perfect binary tree for the aggregate */


Is "perfect" the right word? "Perfectly balanced" perhaps?

According to the wikipedia

A perfect binary tree is a binary tree in which all interior nodes have two children and all leaves have the same depth or same level

Which is why I use that term in data-segment lib

alanshaw · 2023-07-17T15:03:12Z

w3-aggregation.md

 # https://github.com/filecoin-project/go-state-types/blob/1e6cf0d47cdda75383ef036fc2725d1cf51dbde8/abi/piece.go#L47-L50
+# Uses `height` field instead of `size`. `height` field can be used to derive `leafCount` and consequently `size`, while
+# allowing the usage of smaller numbers instead of `bigint`.
 type PieceInfo {


IMO it's fine to leave as PieceInfo, the point is for this information to now be the "piece information" as we'd not materialize and pass around a size value unless for display.

Gozala · 2023-07-17T22:52:39Z

w3-aggregation.md

@@ -132,7 +132,7 @@ A Storefront principal can invoke a capabilty to offer an aggregate that is read
      "offer": { "/": "bafy...many-cars" }, /* dag-cbor CID with offer content */
      "piece": {
        "link": { "/": "commitment...aggregate-proof" },
-        "size": 10102020203013342343
+        "height": 4 /* height of the perfect binary tree for the aggregate */


According to the wikipedia

A perfect binary tree is a binary tree in which all interior nodes have two children and all leaves have the same depth or same level

Which is why I use that term in data-segment lib

Gozala · 2023-07-17T22:54:04Z

w3-aggregation.md

@@ -132,7 +132,7 @@ A Storefront principal can invoke a capabilty to offer an aggregate that is read
      "offer": { "/": "bafy...many-cars" }, /* dag-cbor CID with offer content */
      "piece": {


Please lets not use term proof as we'll have inclusion proofs and ucans have their own proofs and it's going to get very confusing. I'm open to different name, but proof is just too confusing

Gozala · 2023-07-17T22:57:29Z

w3-aggregation.md

@@ -132,7 +132,7 @@ A Storefront principal can invoke a capabilty to offer an aggregate that is read
      "offer": { "/": "bafy...many-cars" }, /* dag-cbor CID with offer content */
      "piece": {


Actually can we just call this an aggregate instead ? Alternatively we could change it all to

"pieces": { "/": "bafy...pieces" } // dag-cbor containing pieces "aggregate": { "/": "bafy...aggregate-cid" }, "height": 4 // height of the aggregate tree

Gozala · 2023-07-17T22:58:29Z

w3-aggregation.md

@@ -132,7 +132,7 @@ A Storefront principal can invoke a capabilty to offer an aggregate that is read
      "offer": { "/": "bafy...many-cars" }, /* dag-cbor CID with offer content */
      "piece": {


Also it's kind of a mistake that height / size is not part of the CID itself.

Gozala · 2023-07-17T22:59:54Z

w3-aggregation.md

@@ -132,7 +132,7 @@ A Storefront principal can invoke a capabilty to offer an aggregate that is read
      "offer": { "/": "bafy...many-cars" }, /* dag-cbor CID with offer content */
      "piece": {


@vasco-santos we should also check with spade team if they even need or care about the pieces here, I suspect they are not.

Gozala · 2023-07-17T23:09:18Z

w3-aggregation.md

-Invoking `aggregate/offer` capability submits an aggregate to a broker service for inclusion in one or more Filecoin deals. The `nb.offer` field represents a "Ferry" aggregate offer that is ready for a Filecoin deal. Its value is the DAG-CBOR CID that refers to a "Ferry" offer. It encodes a dag-cbor block with an array of entries representing all the CAR files to include in the aggregated deal. This block MUST be included in the CAR file that transports the invocation. Its format is:
+Invoking `aggregate/offer` capability submits an aggregate to a broker service for inclusion in one or more Filecoin deals. The `nb.piece` field represents the proof of the `piece` to be offered for the deal. It contains the proof CID `piece.link` together with the `piece.height` of the perfect binary tree computed for this aggregate. The `height` can be used to derive the leaf count (`2 ** height`), which can then be used to derive the `size` of the piece (`leafCount * Node.Size` where `Node.Size` is 32).
+
+The `nb.offer` field represents a "Ferry" aggregate offer that is ready for a Filecoin deal. Its value is the DAG-CBOR CID that refers to a "Ferry" offer. It encodes a dag-cbor block with an array of entries representing all the CAR files to include in the aggregated deal. This block MUST be included in the CAR file that transports the invocation. Its format is:


Do we expect CARs in offer to be in same order as they appear in the aggregate ? I think we need a note whether they SHOULD, MUST, MAY or are RECOMMENDED to follow the order.

yes, they MUST because other party might intend to validate before submitting . I will add

Gozala · 2023-07-17T23:14:00Z

w3-aggregation.md

 # https://github.com/filecoin-project/go-state-types/blob/1e6cf0d47cdda75383ef036fc2725d1cf51dbde8/abi/piece.go#L47-L50
+# Uses `height` field instead of `size`. `height` field can be used to derive `leafCount` and consequently `size`, while
+# allowing the usage of smaller numbers instead of `bigint`.
 type PieceInfo {


I really don't want to call it a PieceProof as it can be confused with InclusionProof (in fact that's how it a appears in the go implementation).

If you want to rename perhaps call it a PieceDetail, personally I don't have strong feelings about the name. In fact it is a mistake that height is not part of the CID, but I'm not sure it's worth trying to fix that.

…together with client and api (#831) Renames `size` to `height` for `piece`/`aggregate` based on described in storacha/data-segment#13 Note that: - took the opportunity to update this to finally rely on `data-segment` lib as it is now ready to be used (both in tests, and to validate aggregate) - given `piece` and `aggregate` are both perfect binary trees, leaf count of can be derived as `2 ** height`, and the size of the tree can be derived by `leafCount * Node.Size` (32). Needs storacha/specs#66

fix: aggregation spec to use height instead of size

50b2822

vasco-santos commented Jul 17, 2023

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vasco-santos requested a review from Gozala July 17, 2023 12:18

vasco-santos mentioned this pull request Jul 17, 2023

fix!: update aggregation capabilitites to use height instead of size together with client and api storacha/w3up#831

Merged

alanshaw approved these changes Jul 17, 2023

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Gozala approved these changes Jul 17, 2023

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fix: mention that order must be the same as computed aggregate

079f7aa

vasco-santos merged commit b2ba739 into main Jul 18, 2023
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vasco-santos deleted the fix/aggregation-spec-to-use-height-instead-of-size branch July 18, 2023 07:58

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fix: aggregation spec to use height instead of size #66

fix: aggregation spec to use height instead of size #66

vasco-santos commented Jul 17, 2023

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Gozala Jul 17, 2023

		@@ -132,7 +132,7 @@ A Storefront principal can invoke a capabilty to offer an aggregate that is read
		"offer": { "/": "bafy...many-cars" }, /* dag-cbor CID with offer content */
		"piece": {

fix: aggregation spec to use height instead of size #66

fix: aggregation spec to use height instead of size #66

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vasco-santos commented Jul 17, 2023

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