39 lines
1.9 KiB
JavaScript
39 lines
1.9 KiB
JavaScript
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"use strict";
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// Keep ssh2's default 32KB request size. Some SFTP servers mishandle larger
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// requests and can silently produce truncated/corrupt files (GitHub #2022).
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const TRANSFER_CHUNK_SIZE = 32 * 1024;
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// Upload fanout: 64 parallel 32KB WRITE requests (~2MB in flight). Matches
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// Electerm transfer.js / ssh2-style defaults (concurrency 64, chunk 32KB) for
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// high-RTT body feel after #2449. Chunk size stays 32KB for server compatibility
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// (#2022 / #2030). Uploads still prefer an isolated SFTP channel / dedicated
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// transfer session so interactive terminal traffic is not starved (#1507).
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const UPLOAD_TRANSFER_CONCURRENCY = 64;
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// Downloads need a larger request window on high-latency proxy paths. 64 is
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// ssh2's fastGet default and, with the safe 32KB request size, restores the 2MB
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// in-flight window Netcatty used before the shared chunk-size fix in #2030.
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const DOWNLOAD_TRANSFER_CONCURRENCY = 64;
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// Prefix verification must fail closed when a server stops answering, but allow
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// slow links to make progress without imposing a whole-transfer deadline.
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const SFTP_OPEN_TIMEOUT_MS = 15_000;
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const SFTP_REQUEST_TIMEOUT_MS = 30_000;
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// Only one file per SFTP session holds the 64-request concurrent READ fanout
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// (isolated channel or shared/sudo browse path). Additional downloads wait for
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// a free slot rather than degrading to serial createReadStream (#2719 / #2449
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// fail-closed). Folder fan-out is capped in the renderer by
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// runSftpTransferWorkers (settings transfer concurrency). Multi-select
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// top-level downloads enqueue in parallel and share the same host scheduler /
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// channel pool caps - they must never fall back to serial body streams.
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const FAST_DOWNLOAD_CHANNELS_PER_SESSION = 1;
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module.exports = {
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DOWNLOAD_TRANSFER_CONCURRENCY,
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FAST_DOWNLOAD_CHANNELS_PER_SESSION,
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SFTP_OPEN_TIMEOUT_MS,
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SFTP_REQUEST_TIMEOUT_MS,
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TRANSFER_CHUNK_SIZE,
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UPLOAD_TRANSFER_CONCURRENCY,
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};
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