{
 "number": 35728,
 "input_hash": "ac55828218a9ec01",
 "model": "openrouter/google/gemini-3.8-flash",
 "batch": false,
 "created": "2026-09-17T21:38:27+00:00",
 "provider": "Google",
 "stop_reason": "end_turn",
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  "display": {
   "goal": [
    "Distinguish disk I/O and deserialization errors from missing transactions in transaction lookups.",
    "Prevent RPC and REST callers from falsely concluding a transaction does not exist when disk reads fail."
   ],
   "reviewability": [
    "Needs rebase due to merge conflicts.",
    "The PR has also been waiting on an author reply to a review question for over 60 days."
   ],
   "agreement": [
    "Concept support for separating disk errors from missing transactions (yuvicc, musaHaruna).",
    "Unaddressed objection: pruned blocks erroneously report an I/O error instead of 'Block not available' with no author reply (yuvicc)."
   ],
   "categories": [
    {
     "name": "rpc",
     "why": [
      "P3 because reporting missing transactions during disk failures misleads client applications and indexers.",
      "This fixes edge-case error reporting across getrawtransaction, gettxoutproof, and REST endpoints."
     ]
    },
    {
     "name": "indexes",
     "why": [
      "P3 because it improves the TxIndex::FindTx interface to explicitly surface disk errors.",
      "It allows consumers to reliably separate index misses from underlying database or block file corruption."
     ]
    }
   ]
  },
  "summary": "This PR refactors `TxIndex::FindTx` and `node::GetTransaction` to return `util::Expected<CTransactionRef, std::string>` instead of flattening failures to `nullptr` or `false`. RPC and REST callers (`getrawtransaction`, `gettxoutproof`, `ProcessPSBT`, `rest_tx`) are updated to throw internal errors on disk or deserialization failures rather than reporting the transaction as not found.",
  "problem": "When reading a transaction from disk fails due to an I/O or deserialization error, `GetTransaction` returns `nullptr`, making callers believe the transaction does not exist. Downstream services and wallets can misinterpret node I/O corruption as an unconfirmed or nonexistent transaction.",
  "discussion": {
   "open_concerns": [
    "yuvicc pointed out that for pruned blocks, `getrawtransaction <txid> <blockhash>` returns 'I/O error reading block data' instead of 'Block not available'."
   ],
   "resolved_concerns": [],
   "author_status": "silent since 2026-07-16"
  },
  "reviewability": {
   "state": "Stale",
   "label": "Needs rebase",
   "reason": "The PR has merge conflicts with base branches, is in draft state, and the author has been inactive on the PR for over 60 days."
  },
  "agreement": {
   "participants": [
    {
     "login": "yuvicc",
     "stance": "objection",
     "note": "Concept ACK but raised a concern about pruned blocks returning an I/O error instead of 'Block not available'"
    },
    {
     "login": "musaHaruna",
     "stance": "support",
     "note": "Concept ACK and suggested wrapping test block restoration in try-finally"
    }
   ],
   "objections": [
    {
     "reviewer": "yuvicc",
     "kind": "correctness",
     "harm": "In pruned mode, requesting a pruned block returns 'I/O error reading block data' instead of 'Block not available'",
     "blocking": false,
     "author_replied": false,
     "fix_pushed": false,
     "status": "open",
     "evidence": "2026-07-16: 'In pruned mode when user calls getrawtransaction <txid> <blockhash> for the block that is pruned we return \"I/O error reading block data\" instead we should return \"Block not available\" which was done previously?'",
     "resolution_evidence": "",
     "sources": [
      "dossier",
      "thread"
     ]
    }
   ],
   "support": [
    {
     "reviewer": "yuvicc",
     "reason": "Distinguishing \u201ctransaction not found\u201d from internal read failures in TxIndex::FindTx/GetTransaction makes sense.",
     "substantive": true
    },
    {
     "reviewer": "musaHaruna",
     "reason": "Concept ACK on separating expected outcomes (\"transaction not found\") from unexpected failures (I/O errors).",
     "substantive": true
    }
   ],
   "state": "Mild",
   "summary": "Mild: yuvicc noted pruned blocks mistakenly report an I/O error instead of 'Block not available', open with no author reply.",
   "reason": "Reviewers support distinguishing I/O errors from missing transactions, but yuvicc noted a regression where pruned blocks report an I/O error, which remains unanswered by the author.",
   "evidence": [
    "yuvicc provided Concept ACK but flagged incorrect pruned block error handling",
    "musaHaruna gave Concept ACK and suggested minor functional test improvements"
   ],
   "model_state": "Mild",
   "derivation": "nonblocking objection open (yuvicc)",
   "corrections": [],
   "thread_read": {
    "state": "Mild",
    "derived": "Mild",
    "objections": [
     {
      "reviewer": "yuvicc",
      "kind": "interface",
      "harm": "calls to getrawtransaction on pruned blocks return misleading 'I/O error reading block data' instead of 'Block not available'",
      "blocking": false,
      "author_replied": false,
      "fix_pushed": false,
      "status": "open",
      "evidence": "2026-07-16: \"In pruned mode when user calls getrawtransaction <txid> <blockhash> for the block that is pruned we return \\\"I/O error reading block data\\\" instead we should return \\\"Block not available\\\" which was done previously?\"",
      "resolution_evidence": ""
     }
    ],
    "support": [
     {
      "reviewer": "musaHaruna",
      "reason": "separating expected outcomes (\"transaction not found\") from unexpected failures (I/O errors)",
      "substantive": true
     },
     {
      "reviewer": "yuvicc",
      "reason": "distinguishing \"transaction not found\" from internal read failures in TxIndex::FindTx/GetTransaction makes sense",
      "substantive": true
     }
    ],
    "participants": [
     {
      "login": "yuvicc",
      "stance": "objection",
      "note": "Concept ACK, but noted that pruned blocks may return misleading I/O error instead of 'Block not available'"
     },
     {
      "login": "musaHaruna",
      "stance": "support",
      "note": "Concept ACK, suggested test cleanup (try...finally)"
     }
    ],
    "corrections": [],
    "summary": "Mild; yuvicc notes pruned blocks may return misleading I/O error instead of 'Block not available', unaddressed by author",
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   "first_read": {
    "state": "Mild",
    "model_state": "Mild",
    "objections": [
     {
      "reviewer": "yuvicc",
      "kind": "correctness",
      "harm": "In pruned mode, requesting a pruned block returns 'I/O error reading block data' instead of 'Block not available'",
      "blocking": false,
      "author_replied": false,
      "fix_pushed": false,
      "status": "open",
      "evidence": "2026-07-16: 'In pruned mode when user calls getrawtransaction <txid> <blockhash> for the block that is pruned we return \"I/O error reading block data\" instead we should return \"Block not available\" which was done previously?'",
      "resolution_evidence": ""
     }
    ],
    "support": [
     {
      "reviewer": "yuvicc",
      "reason": "Distinguishing \u201ctransaction not found\u201d from internal read failures in TxIndex::FindTx/GetTransaction makes sense.",
      "substantive": true
     },
     {
      "reviewer": "musaHaruna",
      "reason": "Concept ACK on separating expected outcomes (\"transaction not found\") from unexpected failures (I/O errors).",
      "substantive": true
     }
    ]
   }
  },
  "dependencies": {
   "depends_on": [],
   "enables": []
  },
  "categories": [
   {
    "name": "rpc",
    "member": true,
    "evidence": "Changes error handling and return codes for getrawtransaction, gettxoutproof, and REST endpoints.",
    "band": "P3",
    "reason_tag": "bug fix",
    "score": 0.35,
    "factors": {
     "security_stability": 1,
     "bug_severity": 1,
     "performance": 0,
     "user_value": 1,
     "leverage": 0
    },
    "rationale": "Fixes an RPC error-reporting flaw where I/O errors are conflated with missing transactions, avoiding misinforming RPC consumers during disk corruption."
   },
   {
    "name": "indexes",
    "member": true,
    "evidence": "Modifies TxIndex::FindTx interface in src/index/txindex.cpp to return util::Expected.",
    "band": "P3",
    "reason_tag": "cleanup",
    "score": 0.3,
    "factors": {
     "security_stability": 1,
     "bug_severity": 1,
     "performance": 0,
     "user_value": 0,
     "leverage": 1
    },
    "rationale": "Improves txindex query interface by clearly signaling disk read failures rather than conflating them with missing tx entries."
   },
   {
    "name": "tests",
    "member": false,
    "evidence": "Functional test changes only test the new I/O error reporting functionality, not test framework infrastructure.",
    "band": "Unranked",
    "reason_tag": "",
    "score": 0.0,
    "factors": {
     "security_stability": 0,
     "bug_severity": 0,
     "performance": 0,
     "user_value": 0,
     "leverage": 0
    },
    "rationale": "The functional test addition test/functional/feature_io_errors.py merely covers the new RPC behavior."
   }
  ],
  "confidence": "high",
  "uncertainties": [],
  "needs": [],
  "card": "This draft PR updates GetTransaction and TxIndex::FindTx to return Expected types, differentiating internal I/O failures from missing transactions across RPC and REST endpoints. Currently, an I/O error reading block data falsely reports that a transaction does not exist. Both reviewers agree with the concept, but yuvicc noted an unresolved regression where pruned blocks return an internal I/O error instead of 'Block not available'. The PR has merge conflicts and has been waiting on the author for over two months."
 },
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