fix: injectable tunnel log label, honest truncate budget comment

packages/core/src/format.ts

@@ -32,7 +32,10 @@ export const sliceUtf8 = (s: string, maxBytes: number): string => {
 }
 
 // Serialize `value` to JSON and, if it exceeds `maxBytes` (UTF-8), return a
-// truncated marker object whose own serialization stays within `maxBytes`.
+// truncated marker object. A fixed 256-byte margin is reserved for the marker
+// metadata, so the marker's own serialization stays within `maxBytes` for any
+// budget at or above a few hundred bytes (esmole uses 100 KB). For
+// pathologically tiny budgets the marker may exceed `maxBytes`.
 export const truncateJsonBudget = (
     value: unknown,
     maxBytes: number

packages/core/src/net/tunnel.ts

@@ -50,7 +50,8 @@ export const buildSshAuth = (
 export const openTunnel = async (
     ssh: SshConfig,
     dstHost: string,
-    dstPort: number
+    dstPort: number,
+    logLabel: string = 'ssh-tunnel'
 ): Promise<Tunnel> => {
     const client = new Client()
 
@@ -67,7 +68,7 @@ export const openTunnel = async (
 
     // After 'ready' resolved, later ssh errors must not crash the process.
     client.on('error', (error) => {
-        console.error('ssh-tunnel: ssh tunnel error: ' + error.message)
+        console.error(logLabel + ': ssh tunnel error: ' + error.message)
     })
 
     let closed = false
@@ -140,7 +141,7 @@ export const openTunnel = async (
     // without a persistent one, a later listener error is swallowed and the
     // tunnel silently serves a dead socket. Mark it closed instead.
     server.on('error', (error) => {
-        console.error('ssh-tunnel: tunnel listener error: ' + error.message)
+        console.error(logLabel + ': tunnel listener error: ' + error.message)
         markClosed()
     })