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feat(market): per-pair candle cache — instant switch-back, no re-fetch

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The per-exchange chart used a single buffer keyed by the loaded pair, so
bouncing between venues (Ourbit <-> NonKYC) re-fetched every switch (loading
spinner each time). Add a per-pair cache: each venue's fetched candles (OHLC +
derived close series) are kept keyed by "<identifier>:<BASE>/<QUOTE>". Switching
back to a recently-viewed pair loads from the cache instantly — no fetch, no
spinner — while entries older than 30 min re-fetch to stay fresh. Bounded to 16
entries (irrelevant for DRGX's 2 venues, but safe if it lists more). Cache is
main-thread-only (populated by the worker's completion MainCb), so no races.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
DanS
2026-07-12 13:48:53 -05:00
parent bfe8b4d77d
commit 82da4af857
2 changed files with 38 additions and 10 deletions
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8
src/app.h
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@@ -687,6 +687,14 @@ private:
std::string exchange_chart_key_; // "<identifier>:<BASE>/<QUOTE>" of the loaded series ("" = none)
bool exchange_chart_fetch_in_flight_ = false;
std::chrono::steady_clock::time_point exchange_chart_last_fetch_{};
// Per-pair candle cache: switching back to a recently-viewed venue loads instantly (no re-fetch)
// instead of overwriting the single active buffer. Keyed like exchange_chart_key_.
struct ExchangeChartCache {
std::vector<std::pair<std::time_t, double>> closeIntraday, closeDaily;
std::vector<data::Candle> ohlcIntraday, ohlcDaily;
std::chrono::steady_clock::time_point fetchedAt{};
};
std::unordered_map<std::string, ExchangeChartCache> exchange_chart_cache_;
util::AsyncTaskManager async_tasks_;
bool pending_antivirus_dialog_ = false; // Show Windows Defender help dialog