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07135290c1rest: allow reading partial block data from storage (Roman Zeyde)4e2af1c065blockstorage: allow reading partial block data from storage (Roman Zeyde)f2fd1aa21cblockstorage: return an error code from `ReadRawBlock()` (Roman Zeyde) Pull request description: It allows fetching specific transactions using an external index, following https://github.com/bitcoin/bitcoin/pull/32541#issuecomment-3267485313. Currently, electrs and other indexers map between an address/scripthash to the list of the relevant transactions. However, in order to fetch those transactions from bitcoind, electrs relies on reading the whole block and post-filtering for a specific transaction[^1]. Other indexers use a `txindex` to fetch a transaction using its txid [^2][^3][^4]. The above approach has significant storage and CPU overhead, since the `txid` is a pseudo-random 32-byte value. Also, mainnet `txindex` takes ~60GB today. This PR is adding support for using the transaction's position within its block to be able to fetch it directly using [REST API](https://github.com/bitcoin/bitcoin/blob/master/doc/REST-interface.md), using the following HTTP request: ``` GET /rest/blockpart/BLOCKHASH.bin?offset=OFFSET&size=SIZE ``` - The offsets' index can be encoded much more efficiently ([~1.3GB today](https://github.com/romanz/bindex-rs/pull/66#issuecomment-3508476436)). - Address history query performance can be tested on mainnet using [1BitcoinEaterAddressDontSendf59kuE](https://mempool.space/address/1BitcoinEaterAddressDontSendf59kuE) - assuming warm OS block cache, [it takes <1s to fetch 5200 txs, i.e. <0.2ms per tx](https://github.com/romanz/bindex-rs/pull/66#issuecomment-3508476436) with [bindex](https://github.com/romanz/bindex-rs). - Only binary and hex response formats are supported. [^1]: https://github.com/romanz/electrs/blob/master/doc/schema.md [^2]: https://github.com/Blockstream/electrs/blob/new-index/doc/schema.md#txstore [^3]: https://github.com/spesmilo/electrumx/blob/master/docs/HOWTO.rst#prerequisites [^4]: https://github.com/cculianu/Fulcrum/blob/master/README.md#requirements ACKs for top commit: maflcko: review ACK07135290c1🏪 l0rinc: ACK07135290c1hodlinator: re-ACK07135290c1Tree-SHA512: bcce7bf4b9a3e5e920ab5a83e656f50d5d7840cdde6b7147d329cf578f8a2db555fc1aa5334e8ee64d5630d25839ece77a2cf421c6c3ac1fa379bb453163bd4f