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fix(sftp): cache SFTP channel per session to prevent channel exhaustion

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This commit is contained in:
Vantz Stockwell 2026-03-14 04:18:29 -04:00
parent 3b1c1aeda1
commit e3a978b639
1 changed files with 13 additions and 1 deletions
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14
backend/src/terminal/ssh-connection.service.ts
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@ -157,6 +157,7 @@ export class SshConnectionService {
session.stream?.close();
session.client.end();
this.sessions.delete(sessionId);
this.sftpChannels.delete(sessionId);
// Update connection log with disconnect time
this.prisma.connectionLog.updateMany({
@ -170,21 +171,32 @@ export class SshConnectionService {
return this.sessions.get(sessionId);
}
private sftpChannels = new Map<string, any>();
getSftpChannel(sessionId: string): Promise<any> {
const logger = this.logger;
const cached = this.sftpChannels.get(sessionId);
if (cached) {
return Promise.resolve(cached);
}
return new Promise((resolve, reject) => {
const session = this.sessions.get(sessionId);
if (!session) {
logger.error(`[SFTP] Session ${sessionId} not found in sessions map (${this.sessions.size} active sessions)`);
return reject(new Error('Session not found'));
}
logger.log(`[SFTP] Requesting SFTP subsystem on session ${sessionId}, client connected: ${(session.client as any)._sock?.readable ?? 'unknown'}`);
logger.log(`[SFTP] Requesting SFTP subsystem on session ${sessionId}`);
session.client.sftp((err, sftp) => {
if (err) {
logger.error(`[SFTP] client.sftp() callback error: ${err.message}`);
return reject(err);
}
logger.log(`[SFTP] SFTP subsystem opened successfully for session ${sessionId}`);
sftp.on('close', () => {
this.sftpChannels.delete(sessionId);
logger.log(`[SFTP] Channel closed for session ${sessionId}`);
});
this.sftpChannels.set(sessionId, sftp);
resolve(sftp);
});
});