{"record":{"id":"c66ef063e11b6d83","repo":"astrid-runtime/astrid","slug":"region-as-str-c66ef0","errorCode":null,"errorMessage":"region.as_str()","messagePattern":"region\\.as_str\\(\\)","errorType":"error_code","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/astrid-storage/src/volume/hosted/stream.rs","lineNumber":34,"sourceCode":"\n/// Bounce buffer for payload copy and checksum. Not an operator policy knob:\n/// it does not cap blob size or change the record grammar.\nconst STREAM_BUFFER_BYTES: usize = 64 * 1024;\nconst RECORD_CHECKSUM_OFFSET: u64 = 43;\n\npub(super) fn write_region_from(\n    volume: &HostedFileVolume,\n    region: &VolumeRegion,\n    offset: u64,\n    payload_len: u64,\n    payload: &mut dyn Read,\n) -> io::Result<()> {\n    if payload_len == 0 {\n        return Ok(());\n    }\n    let mut state = volume.state.lock();\n    if !state.regions.contains_key(region) {\n        return Err(io::Error::new(io::ErrorKind::NotFound, region.as_str()));\n    }\n    let end = offset\n        .checked_add(payload_len)\n        .ok_or_else(|| io::Error::other(\"volume write range overflow\"))?;\n    let (physical, _) = append_from(\n        &mut state,\n        Operation::Write,\n        region,\n        offset,\n        payload_len,\n        payload,\n    )?;\n    let region_state = state\n        .regions\n        .get_mut(region)\n        .ok_or_else(|| io::Error::new(io::ErrorKind::NotFound, region.as_str()))?;\n    overlay_extent(&mut region_state.extents, offset, end, physical);\n    region_state.length = region_state.length.max(end);","sourceCodeStart":16,"sourceCodeEnd":52,"githubUrl":"https://github.com/astrid-runtime/astrid/blob/affd8760f44190dbdfbec23403f4c4b642c33112/crates/astrid-storage/src/volume/hosted/stream.rs#L16-L52","documentation":"write_region_from looks up the target region in the volume's locked state before appending. If state.regions does not contain the requested region, the write is rejected with io::ErrorKind::NotFound whose message is simply the region name — the caller is writing to a region that was never created/opened on this volume.","triggerScenarios":"write_region_from is called with a region handle/key absent from volume.state.regions — writing to a region name that was never created, after the region was removed, or on a volume object that hasn't loaded/registered its regions yet.","commonSituations":"A typo'd or differently-cased region name; the caller skipped the create/open-region step; application logic assumed a region exists after a failed create; regions were dropped on volume reload and the caller reused a stale handle.","solutions":["Create or open the region on the volume before writing to it (verify the region-registration API is called first).","Print/compare the exact region name in the error message against the names your code uses — check for typos and case differences.","Confirm the volume instance is the same one where the region was created (not a freshly re-opened volume whose regions weren't loaded).","Check whether the region was deleted or the volume state was reset earlier in the program's lifetime."],"exampleFix":"// before\nvolume.write_region_from(&region, offset, payload).await?;\n// after\nif !volume.has_region(&region) {\n    volume.create_region(&region).await?;\n}\nvolume.write_region_from(&region, offset, payload).await?;","handlingStrategy":"validation","validationCode":"// Rust: check region existence before writing\nif !volume.region_names().contains(&region.to_string()) {\n    volume.create_region(&region).await?;\n}","typeGuard":null,"tryCatchPattern":"match volume.write_region_from(&region, offset, payload).await {\n    Err(e) if e.kind() == io::ErrorKind::NotFound => {\n        volume.create_region(&region).await?;\n        volume.write_region_from(&region, offset, payload).await?;\n    }\n    other => other?,\n}","preventionTips":["Always create/open the region before the first write.","Centralize region-name constants; never hand-type names at call sites.","Track region lifecycle (created/deleted) in application state to avoid stale handles.","Log the region name from the NotFound error to spot typos quickly."],"tags":["storage","not-found","region","volume"],"backgroundTag":"resource-not-found","analyzedSha":"affd8760f44190dbdfbec23403f4c4b642c33112","analyzedAt":"2026-09-09T21:28:12.402Z","contentChangedAt":"2026-09-09T21:28:12.402Z","schemaVersion":2},"datasetVersion":"2026-09-17T15:17:12.973Z"}