69 lines
2.5 KiB
Go
69 lines
2.5 KiB
Go
// Copyright 2026 Alibaba Group
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package event
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import (
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"os"
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"path/filepath"
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"runtime"
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)
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// MaxUnixSocketPath returns the longest Unix socket path accepted by
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// bind/connect on this OS (Go rejects longer names with EINVAL before
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// the syscall). sockaddr_un.sun_path is 104 bytes on darwin and the
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// BSDs and 108 on Linux; the usable budget is one less.
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func MaxUnixSocketPath() int {
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return maxUnixSocketPath(runtime.GOOS)
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}
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func maxUnixSocketPath(goos string) int {
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if goos == "linux" {
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return 107
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}
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return 103
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}
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// IPCEndpoint returns the bus IPC endpoint for one identity: a Named Pipe
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// name on Windows, otherwise bus.sock inside workDir.
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//
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// The canonical Unix location is <workDir>/bus.sock, but workDir derives
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// from the config dir, which can be arbitrarily deep (e.g. dwssb sandboxes
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// use ~/.dwssb/sandboxes/<name>/config/...). When the canonical path would
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// exceed the OS sun_path limit, the socket falls back to a short
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// deterministic path under os.TempDir keyed by a hash of workDir, so every
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// process (consume parent, forked _bus child, status/stop tooling) that
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// derives the endpoint from the same workDir agrees on the location.
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// bus.lock / bus.meta / bus.log always stay in workDir — only the socket
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// moves.
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//
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// This is the single source of truth for endpoint derivation; the cobra
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// layer and busctl must not re-implement the shape.
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func IPCEndpoint(workDir, editionName string, sourceKind SourceKind, identityHash string) string {
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return ipcEndpointForOS(runtime.GOOS, workDir, editionName, sourceKind, identityHash)
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}
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func ipcEndpointForOS(goos, workDir, editionName string, sourceKind SourceKind, identityHash string) string {
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if sourceKind == "" {
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sourceKind = SourceKindAppStream
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}
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if goos == "windows" {
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return `\\.\pipe\dws-event-` + editionName + "-" + string(sourceKind) + "-" + identityHash
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}
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sock := filepath.Join(workDir, "bus.sock")
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if len(sock) <= maxUnixSocketPath(goos) {
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return sock
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}
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return filepath.Join(os.TempDir(), "dws-evt-"+IdentityHash(workDir)+".sock")
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}
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