43 lines
1.6 KiB
Rust
43 lines
1.6 KiB
Rust
use std::fs::File;
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use std::io;
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use concat_arrays::concat_arrays;
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use super::helpers::{create_writer, writer_into_reader, GrenadParameters};
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use crate::{FieldId, InternalError, Result, UserError};
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/// Extracts the geographical coordinates contained in each document under the `_geo` field.
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///
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/// Returns the generated grenad reader containing the docid as key associated to the (latitude, longitude)
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pub fn extract_geo_points<R: io::Read + io::Seek>(
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obkv_documents: grenad::Reader<R>,
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indexer: GrenadParameters,
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primary_key_id: FieldId,
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(lat_fid, lng_fid): (FieldId, FieldId),
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) -> Result<grenad::Reader<File>> {
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let mut writer = create_writer(
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indexer.chunk_compression_type,
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indexer.chunk_compression_level,
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tempfile::tempfile()?,
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);
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let mut cursor = obkv_documents.into_cursor()?;
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while let Some((docid_bytes, value)) = cursor.move_on_next()? {
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let obkv = obkv::KvReader::new(value);
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let (lat, lng) = obkv.get(lat_fid).zip(obkv.get(lng_fid)).ok_or_else(|| {
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let primary_key = obkv.get(primary_key_id).unwrap();
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let primary_key = serde_json::from_slice(primary_key).unwrap();
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UserError::InvalidGeoField { document_id: primary_key }
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})?;
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let (lat, lng): (f64, f64) = (
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serde_json::from_slice(lat).map_err(InternalError::SerdeJson)?,
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serde_json::from_slice(lng).map_err(InternalError::SerdeJson)?,
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);
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let bytes: [u8; 16] = concat_arrays![lat.to_ne_bytes(), lng.to_ne_bytes()];
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writer.insert(docid_bytes, bytes)?;
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}
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Ok(writer_into_reader(writer)?)
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}
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