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RawTables

Struct RawTables 

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pub struct RawTables { /* private fields */ }
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Разобранные top-level блоки ISS payload-а для декодирования нескольких таблиц.

Позволяет один раз разобрать payload и затем извлекать таблицы через RawTables::take_rows без повторного разбора всего JSON-документа.

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impl RawTables

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pub fn len(&self) -> usize

Количество top-level блоков в payload-е.

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pub fn is_empty(&self) -> bool

Проверить, что payload не содержит top-level блоков.

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pub fn table_names(&self) -> impl Iterator<Item = &str>

Имена top-level блоков payload-а.

Итератор отражает текущее состояние кэша: после take_rows(...) соответствующее имя больше не возвращается.

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pub fn take_rows<T>( &mut self, table: impl Into<String>, ) -> Result<Vec<T>, MoexError>

Декодировать строки выбранной таблицы и удалить её из кэша.

Метод потребляет только выбранный top-level блок и не вызывает повторный разбор всего payload-а.

Examples found in repository?
examples/actual_indexes_dump.rs (line 218)
213fn parse_board_snapshots_page(
214    payload: &str,
215    endpoint: &str,
216) -> Result<(Vec<SecuritySnapshot>, Option<SecId>), MoexError> {
217    let mut tables = decode::raw_tables_json(payload, endpoint)?;
218    let security_rows: Vec<RawSecuritySnapshotRow> = tables.take_rows("securities")?;
219    let marketdata_rows: Vec<RawMarketdataSnapshotRow> = tables.take_rows("marketdata")?;
220
221    let mut marketdata_by_secid = HashMap::with_capacity(marketdata_rows.len());
222    for (row, marketdata) in marketdata_rows.into_iter().enumerate() {
223        marketdata_by_secid.insert(marketdata.secid, (row, marketdata.last));
224    }
225
226    let mut first_secid_on_page = None;
227    let mut snapshots = Vec::with_capacity(security_rows.len().max(marketdata_by_secid.len()));
228
229    for (row, security) in security_rows.into_iter().enumerate() {
230        let last = marketdata_by_secid
231            .remove(security.secid.as_str())
232            .and_then(|(_, last)| last);
233        let snapshot = SecuritySnapshot::try_new(security.secid, security.lot_size, last).map_err(
234            |source| MoexError::InvalidSecuritySnapshot {
235                endpoint: endpoint.to_owned().into_boxed_str(),
236                table: "securities",
237                row,
238                source,
239            },
240        )?;
241        if first_secid_on_page.is_none() {
242            first_secid_on_page = Some(snapshot.secid().clone());
243        }
244        snapshots.push(snapshot);
245    }
246
247    for (secid, (row, last)) in marketdata_by_secid {
248        let snapshot = SecuritySnapshot::try_new(secid, None, last).map_err(|source| {
249            MoexError::InvalidSecuritySnapshot {
250                endpoint: endpoint.to_owned().into_boxed_str(),
251                table: "marketdata",
252                row,
253                source,
254            }
255        })?;
256        if first_secid_on_page.is_none() {
257            first_secid_on_page = Some(snapshot.secid().clone());
258        }
259        snapshots.push(snapshot);
260    }
261
262    Ok((snapshots, first_secid_on_page))
263}

Trait Implementations§

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impl Debug for RawTables

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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