rpc-alt: CoinMetadata data loader

[amnn]

Description

Use a DataLoader for fetching CoinMetadata, instead of issuing queries separately. This is fairly important as CoinMetadata queries will be quite common from Wallet clients.

The loader is built on top of the following query:

EXPLAIN ANALYZE SELECT DISTINCT ON (
    candidates.package,
    candidates.module,
    candidates.name,
    candidates.instantiation
)
    candidates.*
FROM
    obj_info candidates
LEFT JOIN
    obj_info newer
ON (
    candidates.object_id = newer.object_id
AND candidates.cp_sequence_number < newer.cp_sequence_number
)
WHERE
    newer.object_id IS NULL
AND candidates.package = '\x0000000000000000000000000000000000000000000000000000000000000002'::bytea
AND candidates.module = 'coin'
AND candidates.name = 'CoinMetadata'
AND candidates.instantiation IN (
    '\x01070000000000000000000000000000000000000000000000000000000000000002037375690353554900'::bytea,
    '\x010700008006563579284526db4e89d73f7bfe3180f0c00bb0e494845e9edbef29bb0a636174616c6f7269616e0a434154414c4f5249414e00'::bytea,
    '\x01070006f9c0b5fd4aed846466683df8c9ce67551715526951130219f2ddcb0806840d66697877616c6c657473706c730d46495857414c4c455453504c5300'::bytea,
    '\x0107000b0aa96d6a3ca2388cff30124761c2dae0759583c72efae600ed5c2df005de037775660357554600'::bytea,
    '\x0107000768051314fa31471f61e7dd0db5282724a1020c41b16f98f242f1875f3dec046d616761044d41474100'::bytea
)
ORDER BY
    candidates.package,
    candidates.module,
    candidates.name,
    candidates.instantiation,
    candidates.cp_sequence_number DESC,
    candidates.object_id DESC;

Test plan

Test that the aggregate query is efficient (check the query plan):

 Unique  (cost=3300.10..3302.50 rows=479 width=159) (actual time=23.142..23.149 rows=5 loops=1)
   ->  Sort  (cost=3300.10..3301.30 rows=479 width=159) (actual time=23.141..23.143 rows=5 loops=1)
         Sort Key: candidates.instantiation, candidates.cp_sequence_number DESC, candidates.object_id DESC
         Sort Method: quicksort  Memory: 25kB
         ->  Nested Loop Anti Join  (cost=1.52..3278.78 rows=479 width=159) (actual time=0.212..23.125 rows=5 loops=1)
               ->  Index Scan using obj_info_inst_object_id_desc on obj_info candidates  (cost=0.82..2585.72 rows=719 width=159) (actual time=0.198..23.046 rows=5 loops=1)
                     Index Cond: ((package = '\x0000000000000000000000000000000000000000000000000000000000000002'::bytea) AND (module = 'coin'::text) AND (name = 'CoinMetadata'::text) AND (instantiation = ANY ('{"\\x01070000000000000000000000000000000000000000000000000000000000000002037375690353554900","\\x010700008006563579284526db4e89d73f7bfe3180f0c00bb0e494845e9edbef29bb0a636174616c6f7269616e0a434154414c4f5249414e00","\\x01070006f9c0b5fd4aed846466683df8c9ce67551715526951130219f2ddcb0806840d66697877616c6c657473706c730d46495857414c4c455453504c5300","\\x0107000b0aa96d6a3ca2388cff30124761c2dae0759583c72efae600ed5c2df005de037775660357554600","\\x0107000768051314fa31471f61e7dd0db5282724a1020c41b16f98f242f1875f3dec046d616761044d41474100"}'::bytea[])))
               ->  Index Only Scan using obj_info_pkey on obj_info newer  (cost=0.70..5.01 rows=11 width=41) (actual time=0.011..0.011 rows=0 loops=5)
                     Index Cond: ((object_id = candidates.object_id) AND (cp_sequence_number > candidates.cp_sequence_number))
                     Heap Fetches: 0
 Planning Time: 6.832 ms
 Execution Time: 23.209 ms
(12 rows)

Existing tests to make sure behaviour is preserved

---

Release notes

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• Protocol:
• Nodes (Validators and Full nodes):
• gRPC:
• JSON-RPC:
• GraphQL:
• CLI:
• Rust SDK:

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