{"record":{"id":"b89a22156f9b3ed0","repo":"astrid-runtime/astrid","slug":"region-as-str-b89a22","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/hosted/mod.rs","lineNumber":223,"sourceCode":"        state.footer_pending = false;\n        state.flush_state = FlushState::Confirmed;\n        Ok(())\n    }\n}\nimpl Drop for HostedFileVolume {\n    fn drop(&mut self) {\n        let state = self.state.get_mut();\n        let _ = Self::make_durable(state);\n        let _ = fs2::FileExt::unlock(&state.file);\n    }\n}\n\nimpl AstridVolume for HostedFileVolume {\n    fn create_region(&self, region: &VolumeRegion, create_new: bool) -> io::Result<()> {\n        let mut state = self.state.lock();\n        if state.regions.contains_key(region) {\n            return if create_new {\n                Err(io::Error::new(\n                    io::ErrorKind::AlreadyExists,\n                    region.as_str(),\n                ))\n            } else {\n                Ok(())\n            };\n        }\n        Self::append(&mut state, Operation::Create, region, 0, &[])?;\n        state.regions.insert(region.clone(), RegionState::default());\n        Ok(())\n    }\n\n    fn region_exists(&self, region: &VolumeRegion) -> io::Result<bool> {\n        Ok(self.state.lock().regions.contains_key(region))\n    }\n\n    fn region_len(&self, region: &VolumeRegion) -> io::Result<u64> {\n        self.state","sourceCodeStart":205,"sourceCodeEnd":241,"githubUrl":"https://github.com/astrid-runtime/astrid/blob/affd8760f44190dbdfbec23403f4c4b642c33112/crates/astrid-storage/src/volume/hosted/mod.rs#L205-L241","documentation":"create_region with create_new=true returns AlreadyExists when the region is already present; the error payload is the region name. It signals an exclusive-create request collided with an existing region.","triggerScenarios":"Calling create_region(&region, true) on a region that already exists, e.g. re-running initialization code that uses exclusive create semantics on every startup.","commonSituations":"Idempotent-init code wrongly passing create_new=true; two workers racing to create the same region; retry logic re-issuing a create after a timeout though the first succeeded.","solutions":["Pass create_new=false if the region existing is acceptable (idempotent create)","Check region_exists() first when you need to distinguish fresh vs existing","Treat io::ErrorKind::AlreadyExists as success in idempotent initialization paths","Fix double-initialization logic so exclusive create runs only once"],"exampleFix":"// before\nvolume.create_region(&region, true)?; // fails on restart\n// after\nvolume.create_region(&region, false)?; // idempotent","handlingStrategy":"try-catch","validationCode":"if volume.region_exists(&region)? && create_new {\n    // decide: skip or surface a controlled conflict before calling\n}","typeGuard":"fn ensure_region(v: &Volume, r: &VolumeRegion) -> io::Result<()> {\n    if v.region_exists(r)? { Ok(()) } else { v.create_region(r, false) }\n}","tryCatchPattern":"match volume.create_region(&region, true) {\n    Err(e) if e.kind() == std::io::ErrorKind::AlreadyExists => Ok(()), // idempotent init\n    other => other,\n}","preventionTips":["Use create_new=false for idempotent initialization","Reserve create_new=true for exclusive-create flows that handle the collision","Guard concurrent creation with an external lock if needed"],"tags":["storage","already-exists","io"],"backgroundTag":"file-already-exists","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"}