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RawTables

Struct RawTables 

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pub struct RawTables { /* private fields */ }
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Разобранные верхнеуровневые 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 верхнеуровневых блоков в payload-е.

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pub fn is_empty(&self) -> bool

Проверить, что payload не содержит верхнеуровневых блоков.

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

Имена верхнеуровневых 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 AsRef<str>, ) -> Result<Vec<T>, MoexError>

Декодировать строки выбранной таблицы и удалить её из кэша.

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

Examples found in repository?
examples/actual_indexes_dump.rs (line 234)
229fn parse_board_snapshots_page(
230    payload: &str,
231    endpoint: &str,
232) -> Result<(Vec<SecuritySnapshot>, Option<SecId>), MoexError> {
233    let mut tables = decode::raw_tables_json(payload, endpoint)?;
234    let security_rows: Vec<RawSecuritySnapshotRow> = tables.take_rows("securities")?;
235    let marketdata_rows: Vec<RawMarketdataSnapshotRow> = tables.take_rows("marketdata")?;
236
237    let mut marketdata_by_secid = HashMap::with_capacity(marketdata_rows.len());
238    for (row, marketdata) in marketdata_rows.into_iter().enumerate() {
239        marketdata_by_secid.insert(marketdata.secid, (row, marketdata.last));
240    }
241
242    let mut first_secid_on_page = None;
243    let mut snapshots = Vec::with_capacity(security_rows.len().max(marketdata_by_secid.len()));
244
245    for (row, security) in security_rows.into_iter().enumerate() {
246        let last = marketdata_by_secid
247            .remove(security.secid.as_str())
248            .and_then(|(_, last)| last);
249        let snapshot = SecuritySnapshot::try_new(security.secid, security.lot_size, last).map_err(
250            |source| MoexError::InvalidSecuritySnapshot {
251                endpoint: endpoint.to_owned().into_boxed_str(),
252                table: "securities",
253                row,
254                source,
255            },
256        )?;
257        if first_secid_on_page.is_none() {
258            first_secid_on_page = Some(snapshot.secid().clone());
259        }
260        snapshots.push(snapshot);
261    }
262
263    for (secid, (row, last)) in marketdata_by_secid {
264        let snapshot = SecuritySnapshot::try_new(secid, None, last).map_err(|source| {
265            MoexError::InvalidSecuritySnapshot {
266                endpoint: endpoint.to_owned().into_boxed_str(),
267                table: "marketdata",
268                row,
269                source,
270            }
271        })?;
272        if first_secid_on_page.is_none() {
273            first_secid_on_page = Some(snapshot.secid().clone());
274        }
275        snapshots.push(snapshot);
276    }
277
278    Ok((snapshots, first_secid_on_page))
279}

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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