{"record":{"id":"16419c3f555de2c0","repo":"astrid-runtime/astrid","slug":"region-as-str","errorCode":null,"errorMessage":"region.as_str()","messagePattern":"region\\.as_str\\(\\)","errorType":"exception","errorClass":"io::Error","httpStatus":null,"severity":"error","filePath":"crates/astrid-storage/src/volume.rs","lineNumber":280,"sourceCode":"            .finish_non_exhaustive()\n    }\n}\n\nimpl VolumeFile {\n    /// Open or create a volume region.\n    ///\n    /// # Errors\n    ///\n    /// Returns a namespace or underlying volume error.\n    pub fn open(\n        volume: Arc<dyn AstridVolume>,\n        region: VolumeRegion,\n        create: bool,\n    ) -> io::Result<Self> {\n        if create {\n            volume.create_region(&region, false)?;\n        } else if !volume.region_exists(&region)? {\n            return Err(io::Error::new(io::ErrorKind::NotFound, region.as_str()));\n        }\n        Ok(Self {\n            volume,\n            region,\n            cursor: 0,\n        })\n    }\n\n    /// Exclusively create a new region.\n    ///\n    /// # Errors\n    ///\n    /// Returns `AlreadyExists` or an underlying volume error.\n    pub fn create_new(volume: Arc<dyn AstridVolume>, region: VolumeRegion) -> io::Result<Self> {\n        volume.create_region(&region, true)?;\n        Ok(Self {\n            volume,\n            region,","sourceCodeStart":262,"sourceCodeEnd":298,"githubUrl":"https://github.com/astrid-runtime/astrid/blob/affd8760f44190dbdfbec23403f4c4b642c33112/crates/astrid-storage/src/volume.rs#L262-L298","documentation":"Opening a volume region in read mode fails with io::ErrorKind::NotFound when the region does not exist and create=false. The error message is the region name itself, so the missing region is identified directly in the error.","triggerScenarios":"Calling the open constructor with create=false for a region name that was never created (create_region was never called, or a different name was used).","commonSituations":"Typo or case mismatch in region names; opening a volume from a fresh/other storage directory where the region was never initialized; racing an open before the create path ran.","solutions":["Pass create=true if the region should be created on first open","Call volume.create_region(&region, false) before opening","Verify the region name matches the one used at creation exactly","Check you are pointed at the same volume/storage directory where the region exists"],"exampleFix":"// before\nlet v = VolumeReader::open(volume, VolumeRegion::new(\"data\")?, false)?; // NotFound on fresh volume\n// after\nlet v = VolumeReader::open(volume, VolumeRegion::new(\"data\")?, true)?; // create if missing","handlingStrategy":"try-catch","validationCode":"if !volume.region_exists(&region)? {\n    volume.create_region(&region, false)?; // or propagate a friendly error\n}","typeGuard":"fn region_available(v: &Volume, r: &VolumeRegion) -> bool { v.region_exists(r).unwrap_or(false) }","tryCatchPattern":"match VolumeReader::open(volume, region.clone(), false) {\n    Err(e) if e.kind() == std::io::ErrorKind::NotFound => {\n        eprintln!(\"region missing: {}\", e); VolumeReader::open(volume, region, true)\n    }\n    other => other,\n}","preventionTips":["Centralize region-name constants to avoid typos","Use create=true for first-open semantics in bootstrap code","Log the region name from the error payload (it is the name itself)","Verify the storage directory/volume identity matches across processes"],"tags":["not-found","storage","io"],"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"}