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vscode-java-debug/src/noConfigDebugInit.ts at main · tannerpace/vscode-java-debug · GitHub
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noConfigDebugInit.ts
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noConfigDebugInit.ts
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
import
*
as
fs
from
'fs'
;
import
*
as
path
from
'path'
;
import
*
as
crypto
from
'crypto'
;
import
*
as
vscode
from
'vscode'
;
import
{
sendInfo
,
sendError
}
from
"vscode-extension-telemetry-wrapper"
;
import
{
getJavaHome
}
from
"./utility"
;
/**
* Registers the configuration-less debugging setup for the extension.
*
* This function sets up environment variables and a file system watcher to
* facilitate debugging without requiring a pre-configured launch.json file.
*
*
@param
envVarCollection - The collection of environment variables to be modified.
*
@param
extPath - The path to the extension directory.
*
* Environment Variables:
* - `VSCODE_JDWP_ADAPTER_ENDPOINTS`: Path to the file containing the debugger adapter endpoint.
* - `JAVA_TOOL_OPTIONS`: JDWP configuration for automatic debugging.
* - `PATH`: Appends the path to the noConfigScripts directory.
*/
export
async
function
registerNoConfigDebug
(
envVarCollection
:
vscode
.
EnvironmentVariableCollection
,
extPath
:
string
,
)
:
Promise
<
vscode
.
Disposable
>
{
const
collection
=
envVarCollection
;
// create a temp directory for the noConfigDebugAdapterEndpoints
// file path format: extPath/.noConfigDebugAdapterEndpoints/endpoint-stableWorkspaceHash.txt
let
workspaceString
=
vscode
.
workspace
.
workspaceFile
?.
fsPath
;
if
(
!
workspaceString
)
{
workspaceString
=
vscode
.
workspace
.
workspaceFolders
?.
map
(
(
e
)
=>
e
.
uri
.
fsPath
)
.
join
(
';'
)
;
}
if
(
!
workspaceString
)
{
const
error
:
Error
=
{
name
:
"NoConfigDebugError"
,
message
:
'[Java Debug] No workspace folder found'
,
}
;
sendError
(
error
)
;
return
Promise
.
resolve
(
new
vscode
.
Disposable
(
(
)
=>
{
}
)
)
;
}
// create a stable hash for the workspace folder, reduce terminal variable churn
const
hash
=
crypto
.
createHash
(
'sha256'
)
;
hash
.
update
(
workspaceString
.
toString
(
)
)
;
const
stableWorkspaceHash
=
hash
.
digest
(
'hex'
)
.
slice
(
0
,
16
)
;
const
tempDirPath
=
path
.
join
(
extPath
,
'.noConfigDebugAdapterEndpoints'
)
;
const
tempFilePath
=
path
.
join
(
tempDirPath
,
`endpoint-
${
stableWorkspaceHash
}
.txt`
)
;
// create the temp directory if it doesn't exist
if
(
!
fs
.
existsSync
(
tempDirPath
)
)
{
fs
.
mkdirSync
(
tempDirPath
,
{
recursive
:
true
}
)
;
}
else
{
// remove endpoint file in the temp directory if it exists (async to avoid blocking)
if
(
fs
.
existsSync
(
tempFilePath
)
)
{
fs
.
promises
.
unlink
(
tempFilePath
)
.
catch
(
(
err
)
=>
{
const
error
:
Error
=
{
name
:
"NoConfigDebugError"
,
message
:
`[Java Debug] Failed to cleanup old endpoint file:
${
err
}
`
,
}
;
sendError
(
error
)
;
}
)
;
}
}
// clear the env var collection to remove any existing env vars
collection
.
clear
(
)
;
// Add env var for VSCODE_JDWP_ADAPTER_ENDPOINTS
// Note: We do NOT set JAVA_TOOL_OPTIONS globally to avoid affecting all Java processes
// (javac, maven, gradle, language server, etc.). Instead, JAVA_TOOL_OPTIONS is set
// only in the debugjava wrapper scripts (debugjava.ps1, debugjava.bat, debugjava)
collection
.
replace
(
'VSCODE_JDWP_ADAPTER_ENDPOINTS'
,
tempFilePath
)
;
// Try to get Java executable from Java Language Server
// This ensures we use the same Java version as the project is compiled with
try
{
const
javaHome
=
await
getJavaHome
(
)
;
if
(
javaHome
)
{
const
javaExec
=
path
.
join
(
javaHome
,
'bin'
,
'java'
)
;
collection
.
replace
(
'VSCODE_JAVA_EXEC'
,
javaExec
)
;
}
}
catch
(
error
)
{
// If we can't get Java from Language Server, that's okay
// The wrapper script will fall back to JAVA_HOME or PATH
}
const
noConfigScriptsDir
=
path
.
join
(
extPath
,
'bundled'
,
'scripts'
,
'noConfigScripts'
)
;
const
pathSeparator
=
process
.
platform
===
'win32'
?
';'
:
':'
;
// Check if the current PATH already ends with a path separator to avoid double separators
const
currentPath
=
process
.
env
.
PATH
||
''
;
const
needsSeparator
=
currentPath
.
length
>
0
&&
!
currentPath
.
endsWith
(
pathSeparator
)
;
const
pathValueToAppend
=
needsSeparator
?
`
${
pathSeparator
}
${
noConfigScriptsDir
}
`
:
noConfigScriptsDir
;
collection
.
append
(
'PATH'
,
pathValueToAppend
)
;
// create file system watcher for the debuggerAdapterEndpointFolder for when the communication port is written
const
fileSystemWatcher
=
vscode
.
workspace
.
createFileSystemWatcher
(
new
vscode
.
RelativePattern
(
tempDirPath
,
'**/*.txt'
)
)
;
// Track active debug sessions to prevent duplicates
const
activeDebugSessions
=
new
Set
<
number
>
(
)
;
// Handle both file creation and modification to support multiple runs
const
handleEndpointFile
=
async
(
uri
:
vscode
.
Uri
)
=>
{
const
filePath
=
uri
.
fsPath
;
// Add a small delay to ensure file is fully written
// File system events can fire before write is complete
await
new
Promise
(
resolve
=>
setTimeout
(
resolve
,
100
)
)
;
fs
.
readFile
(
filePath
,
(
err
,
data
)
=>
{
if
(
err
)
{
const
error
:
Error
=
{
name
:
"NoConfigDebugError"
,
message
:
`[Java Debug] No-config debug failed: file_read_error -
${
err
}
`
,
}
;
sendError
(
error
)
;
return
;
}
try
{
// parse the client port
const
dataParse
=
data
.
toString
(
)
;
const
jsonData
=
JSON
.
parse
(
dataParse
)
;
// Validate JSON structure
if
(
!
jsonData
||
typeof
jsonData
!==
'object'
||
!
jsonData
.
client
)
{
const
error
:
Error
=
{
name
:
"NoConfigDebugError"
,
message
:
`[Java Debug] No-config debug failed: invalid_format -
${
dataParse
}
`
,
}
;
sendError
(
error
)
;
return
;
}
const
clientPort
=
jsonData
.
client
.
port
;
// Validate port number
if
(
!
clientPort
||
typeof
clientPort
!==
'number'
||
clientPort
<
1
||
clientPort
>
65535
)
{
const
error
:
Error
=
{
name
:
"NoConfigDebugError"
,
message
:
`[Java Debug] No-config debug failed: invalid_port -
${
clientPort
}
`
,
}
;
sendError
(
error
)
;
return
;
}
// Check if we already have an active session for this port
if
(
activeDebugSessions
.
has
(
clientPort
)
)
{
// Skip duplicate session silently - this is expected behavior
return
;
}
// Mark this port as active
activeDebugSessions
.
add
(
clientPort
)
;
const
options
:
vscode
.
DebugSessionOptions
=
{
noDebug
:
false
,
}
;
// start debug session with the client port
vscode
.
debug
.
startDebugging
(
undefined
,
{
type
:
'java'
,
request
:
'attach'
,
name
:
'Attach to Java (No-Config)'
,
hostName
:
'localhost'
,
port
:
clientPort
,
}
,
options
,
)
.
then
(
(
started
)
=>
{
if
(
started
)
{
// Send telemetry only on successful session start with port info
sendInfo
(
''
,
{
message
:
'[Java Debug] No-config debug session started'
,
port
:
clientPort
}
)
;
// Clean up the endpoint file after successful debug session start (async)
if
(
fs
.
existsSync
(
filePath
)
)
{
fs
.
promises
.
unlink
(
filePath
)
.
catch
(
(
cleanupErr
)
=>
{
// Cleanup failure is non-critical, just log for debugging
const
error
:
Error
=
{
name
:
"NoConfigDebugError"
,
message
:
`[Java Debug] No-config debug failed: cleanup_error -
${
cleanupErr
}
`
,
}
;
sendError
(
error
)
;
}
)
;
}
}
else
{
const
error
:
Error
=
{
name
:
"NoConfigDebugError"
,
message
:
`[Java Debug] No-config debug failed: attach_failed - port
${
clientPort
}
`
,
}
;
sendError
(
error
)
;
// Remove from active sessions on failure
activeDebugSessions
.
delete
(
clientPort
)
;
}
}
,
(
error
)
=>
{
const
attachError
:
Error
=
{
name
:
"NoConfigDebugError"
,
message
:
`[Java Debug] No-config debug failed: attach_error - port
${
clientPort
}
-
${
error
}
`
,
}
;
sendError
(
attachError
)
;
// Remove from active sessions on error
activeDebugSessions
.
delete
(
clientPort
)
;
}
,
)
;
}
catch
(
parseErr
)
{
const
error
:
Error
=
{
name
:
"NoConfigDebugError"
,
message
:
`[Java Debug] No-config debug failed: parse_error -
${
parseErr
}
`
,
}
;
sendError
(
error
)
;
}
}
)
;
}
;
// Listen for both file creation and modification events
const
fileCreationEvent
=
fileSystemWatcher
.
onDidCreate
(
handleEndpointFile
)
;
const
fileChangeEvent
=
fileSystemWatcher
.
onDidChange
(
handleEndpointFile
)
;
// Clean up active sessions when debug session ends
const
debugSessionEndListener
=
vscode
.
debug
.
onDidTerminateDebugSession
(
(
session
)
=>
{
if
(
session
.
name
===
'Attach to Java (No-Config)'
&&
session
.
configuration
.
port
)
{
const
port
=
session
.
configuration
.
port
;
activeDebugSessions
.
delete
(
port
)
;
// Session end is normal operation, no telemetry needed
}
}
)
;
return
Promise
.
resolve
(
new
vscode
.
Disposable
(
(
)
=>
{
fileSystemWatcher
.
dispose
(
)
;
fileCreationEvent
.
dispose
(
)
;
fileChangeEvent
.
dispose
(
)
;
debugSessionEndListener
.
dispose
(
)
;
activeDebugSessions
.
clear
(
)
;
}
)
,
)
;
}
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