Implement remote DFS support for LogicalFileListFiltered

[Copilot]

Adds remote DFS capability to LogicalFileListFiltered, enabling file listing across remote storage planes. Previously, the remoteDfs parameter threw "not supported yet" exception.

Changes

ESDL Interface (ws_dfs.ecm)

• Added DFSListFiltered method (version 1.02)
• Request: mask, filters (human-readable), fields, limits
• Response: compressed property tree with file metadata

Server Handler (ws_dfsservice.cpp)

• CWsDfsEx::onDFSListFiltered(): parses user-friendly filters server-side, queries Dali via getDFAttributesFilteredIterator(), returns LZ-compressed results
• parseUserFilterSyntax(): translates owner:jsmith, size>1000 to internal Dali filter format
• validateFileField(): field name validation with alias support (superfile→numsubfiles, rowcount→recordcount)

Client (ws_dfsclient.cpp)

• listFilteredDFSFiles(): discovers remote service via getRemoteStorage(), handles SSL/auth, sends human-readable parameters, decompresses response

Plugin (fileservices.cpp)

• fsLogicalFileListFiltered(): routes to remote service when remoteDfs specified, otherwise local Dali query unchanged

Usage

IMPORT Std;

files := Std.File.LogicalFileListFiltered(
    mask := 'production::*',
    filters := 'owner:analytics, size>1000000, modified>=2024-01-01',
    fields := 'name,size,modified,cluster',
    remoteDfs := 'backup-cluster'  // Now functional
);

Implementation Notes

• Filter parsing centralized on server to maintain single source of truth
• Follows existing lookupDFSFile pattern for remote communication, lease management, and retry logic
• Limits: 1M client-side, 10M server-side (validated at respective layers)
• Requires ESDL build to generate interface stubs before compilation

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• downloads.apache.org
  • Triggering command: /usr/bin/curl curl --fail --retry 3 -L REDACTED --create-dirs --output apr-1.7.6.tar.bz2.7325.part -H User-Agent: vcpkg/2025-09-03-4580816534ed8fd9634ac83d46471440edd82dfe (curl) u/13/cc1 --64�� -o conftest.o /snap/bin/as h include/antlr3commontoken.h include/antlr3commontree.h include/antlr3commontreeadaptor.h incl --global ild/vcpkg_downlo. as (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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