72 lines
2.7 KiB
Rust
72 lines
2.7 KiB
Rust
use std::fs::File;
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use std::io;
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use std::result::Result as StdResult;
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use concat_arrays::concat_arrays;
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use serde_json::Value;
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use super::helpers::{create_writer, writer_into_reader, GrenadParameters};
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use crate::error::GeoError;
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use crate::{FieldId, InternalError, Result};
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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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// since we only needs the primary key when we throw an error we create this getter to
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// lazily get it when needed
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let primary_key = || -> Value {
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let primary_key = obkv.get(primary_key_id).unwrap();
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serde_json::from_slice(primary_key).unwrap()
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};
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// first we get the two fields
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let lat = obkv.get(lat_fid);
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let lng = obkv.get(lng_fid);
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if let Some((lat, lng)) = lat.zip(lng) {
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// then we extract the values
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let lat = extract_float_from_value(
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serde_json::from_slice(lat).map_err(InternalError::SerdeJson)?,
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)
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.map_err(|lat| GeoError::BadLatitude { document_id: primary_key(), value: lat })?;
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let lng = extract_float_from_value(
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serde_json::from_slice(lng).map_err(InternalError::SerdeJson)?,
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)
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.map_err(|lng| GeoError::BadLongitude { document_id: primary_key(), value: lng })?;
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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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} else if lat.is_none() && lng.is_some() {
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return Err(GeoError::MissingLatitude { document_id: primary_key() })?;
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} else if lat.is_some() && lng.is_none() {
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return Err(GeoError::MissingLongitude { document_id: primary_key() })?;
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}
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}
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Ok(writer_into_reader(writer)?)
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}
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fn extract_float_from_value(value: Value) -> StdResult<f64, Value> {
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match value {
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Value::Number(ref n) => n.as_f64().ok_or(value),
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Value::String(ref s) => s.parse::<f64>().map_err(|_| value),
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value => Err(value),
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}
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}
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