feat: introduce the JobWrapperOfflineTemplate

src/DIRAC/Resources/Computing/SingularityComputingElement.py

@@ -269,7 +269,7 @@ def __createWorkArea(self, jobDesc=None, log=None, logLevel="INFO", proxy=None):
         )
         if not result["OK"]:
             return result
-        wrapperPath = result["Value"]["JobExecutableRelocatedPath"]
+        wrapperPath = result["Value"].get("JobExecutableRelocatedPath")
 
         if self.__installDIRACInContainer:
             infoDict = None

src/DIRAC/WorkloadManagementSystem/JobWrapper/JobWrapper.py

@@ -394,8 +394,6 @@ def process(self, command: str, output: str, error: str, env: dict):
             # Job specifies memory in GB, internally use KB
             jobMemory = int(self.jobArgs["Memory"]) * 1024.0 * 1024.0
 
-        # The actual executable is not yet running: it will be in few lines
-        self.__report(minorStatus=JobMinorStatus.APPLICATION, sendFlag=True)
         spObject = Subprocess(timeout=False, bufferLimit=int(self.bufferLimit))
         exeThread = ExecutionThread(spObject, command, self.maxPeekLines, output, error, env, self.executionResults)
         exeThread.start()
@@ -574,6 +572,9 @@ def execute(self):
             return result
         payloadParams = result["Value"]
 
+        # The actual executable is not yet running: it will be in few lines
+        self.__report(minorStatus=JobMinorStatus.APPLICATION, sendFlag=True)
+
         result = self.process(
             command=payloadParams["command"],
             output=payloadParams["output"],

src/DIRAC/WorkloadManagementSystem/JobWrapper/JobWrapperOfflineTemplate.py

@@ -0,0 +1,86 @@
+#!/usr/bin/env python
+""" This template will become the job wrapper that's actually executed.
+
+The JobWrapperOfflineTemplate is completed and invoked by the PushJobAgent and uses functionalities from JobWrapper module.
+It is executed in environment where external connections are not allowed.
+We assume this script is executed in a specific environment where DIRAC is available.
+"""
+import hashlib
+import sys
+import json
+import os
+
+sitePython = os.path.realpath("@SITEPYTHON@")
+if sitePython:
+    sys.path.insert(0, sitePython)
+
+from DIRAC.Core.Base.Script import Script
+
+Script.parseCommandLine()
+
+from DIRAC import gLogger
+from DIRAC.WorkloadManagementSystem.JobWrapper.JobWrapper import JobWrapper
+
+os.umask(0o22)
+
+
+def execute(jobID: str, arguments: dict):
+    """The only real function executed here"""
+    payloadParams = arguments.pop("Payload", {})
+    if not payloadParams:
+        return 1
+
+    if not "PayloadResults" in arguments["Job"] or not "Checksum" in arguments["Job"]:
+        return 1
+
+    try:
+        job = JobWrapper(jobID)
+        job.initialize(arguments)  # initialize doesn't return S_OK/S_ERROR
+    except Exception as exc:  # pylint: disable=broad-except
+        gLogger.exception("JobWrapper failed the initialization phase", lException=exc)
+        return 1
+
+    payloadResult = job.process(**payloadParams)
+    if not payloadResult["OK"]:
+        return 1
+
+    # Store the payload result
+    with open(arguments["Job"]["PayloadResults"], "w") as f:
+        json.dump(payloadResult, f)
+
+    # Generate the checksum of the files present in the current directory
+    checksums = {}
+    for file in os.listdir("."):
+        if not os.path.isfile(file):
+            continue
+        with open(file, "rb") as f:
+            digest = hashlib.file_digest(f, "sha256")
+        checksums[file] = digest.hexdigest()
+
+    with open(arguments["Job"]["Checksum"], "w") as f:
+        json.dump(checksums, f)
+
+    return 0
+
+
+##########################################################
+
+
+ret = -3
+try:
+    jsonFileName = os.path.realpath(__file__) + ".json"
+    with open(jsonFileName) as f:
+        jobArgs = json.load(f)
+    if not isinstance(jobArgs, dict):
+        raise TypeError(f"jobArgs is of type {type(jobArgs)}")
+    if "Job" not in jobArgs:
+        raise ValueError(f"jobArgs does not contain 'Job' key: {str(jobArgs)}")
+
+    jobID = jobArgs["Job"].get("JobID", 0)
+    jobID = int(jobID)
+
+    ret = execute(jobID, jobArgs)
+except Exception as exc:  # pylint: disable=broad-except
+    gLogger.exception("JobWrapperTemplate exception")
+
+sys.exit(ret)

src/DIRAC/WorkloadManagementSystem/JobWrapper/JobWrapperTemplate.py

@@ -13,7 +13,6 @@
 """
 import sys
 import json
-import ast
 import os
 import errno
 import time

src/DIRAC/WorkloadManagementSystem/JobWrapper/test/Test_JobWrapperTemplate.py

@@ -149,7 +149,7 @@ def test_createAndExecuteJobWrapperTemplate_success(extraOptions):
 
     # This is the default wrapper path
     assert os.path.exists(os.path.join(os.getcwd(), "job/Wrapper"))
-    shutil.rmtree(os.path.join(os.getcwd(), "job/Wrapper"))
+    shutil.rmtree(os.path.join(os.getcwd(), "job"))
 
 
 def test_createAndExecuteJobWrapperTemplate_missingExtraOptions():
@@ -211,7 +211,7 @@ def test_createAndExecuteJobWrapperTemplate_missingExtraOptions():
 
     # This is the default wrapper path
     assert os.path.exists(os.path.join(os.getcwd(), "job/Wrapper"))
-    shutil.rmtree(os.path.join(os.getcwd(), "job/Wrapper"))
+    shutil.rmtree(os.path.join(os.getcwd(), "job"))
 
 
 def test_createAndExecuteRelocatedJobWrapperTemplate_success(extraOptions):
@@ -332,3 +332,212 @@ def test_createAndExecuteRelocatedJobWrapperTemplate_success(extraOptions):
 
     shutil.rmtree(rootLocation)
     shutil.rmtree(wrapperPath)
+
+
+def test_createAndExecuteJobWrapperOfflineTemplate_success(extraOptions):
+    """Test the creation of an offline job wrapper and its execution:
+    This is generally used when pre/post processing operations are executed locally,
+    while the workflow itself is executed on a remote computing resource (PushJobAgent).
+    """
+    # Working directory on the remote resource
+    rootLocation = "."
+    numberOfFiles = len(os.listdir(rootLocation))
+
+    # Create relocated job wrapper
+    res = createJobWrapper(
+        jobID=1,
+        jobParams=jobParams,
+        resourceParams=resourceParams,
+        optimizerParams=optimizerParams,
+        # This is the interesting part
+        defaultWrapperLocation="DIRAC/WorkloadManagementSystem/JobWrapper/JobWrapperOfflineTemplate.py",
+        pythonPath="python",
+        rootLocation=rootLocation,
+        extraOptions=extraOptions,
+    )
+    assert res["OK"], res.get("Message")
+
+    # Test job wrapper content
+    jobWrapperPath = res["Value"].get("JobWrapperPath")
+    assert jobWrapperPath
+    assert os.path.exists(jobWrapperPath)
+    assert not os.path.exists(os.path.join(rootLocation, os.path.basename(jobWrapperPath)))
+
+    with open(jobWrapperPath) as f:
+        jobWrapperContent = f.read()
+
+    assert "@SITEPYTHON@" not in jobWrapperContent
+    assert f"sys.path.insert(0, sitePython)" in jobWrapperContent
+
+    # Test job wrapper configuration path
+    jobWrapperConfigPath = res["Value"].get("JobWrapperConfigPath")
+    assert jobWrapperConfigPath
+    assert os.path.exists(jobWrapperConfigPath)
+    assert not os.path.exists(os.path.join(rootLocation, os.path.basename(jobWrapperConfigPath)))
+
+    with open(jobWrapperConfigPath) as f:
+        jobWrapperConfigContent = json.load(f)
+
+    assert jobWrapperConfigContent["Job"] == jobParams
+    assert jobWrapperConfigContent["CE"] == resourceParams
+    assert jobWrapperConfigContent["Optimizer"] == optimizerParams
+    assert "Payload" not in jobWrapperConfigContent
+
+    # Test job executable path
+    jobExecutablePath = res["Value"].get("JobExecutablePath")
+    assert jobExecutablePath
+    assert os.path.exists(jobExecutablePath)
+    assert not os.path.exists(os.path.join(rootLocation, os.path.basename(jobExecutablePath)))
+
+    with open(jobExecutablePath) as f:
+        jobExecutableContent = f.read()
+
+    assert os.path.realpath(sys.executable) not in jobExecutableContent
+    assert "python" in jobExecutableContent
+
+    assert jobWrapperPath not in jobExecutableContent
+    assert os.path.join(rootLocation, os.path.basename(jobWrapperPath)) in jobExecutableContent
+    assert extraOptions in jobExecutableContent
+    assert "-o LogLevel=INFO" in jobExecutableContent
+    assert "-o /DIRAC/Security/UseServerCertificate=no" in jobExecutableContent
+
+    # Test job executable relocated path
+    jobExecutableRelocatedPath = res["Value"].get("JobExecutableRelocatedPath")
+    assert jobExecutableRelocatedPath
+    assert jobExecutablePath != jobExecutableRelocatedPath
+    assert os.path.basename(jobExecutablePath) == os.path.basename(jobExecutableRelocatedPath)
+    assert not os.path.exists(jobExecutableRelocatedPath)
+
+    # 1. Execute the executable file in a subprocess without relocating the files as if they were on the remote resource
+    # We expect it to fail because the job wrapper is not in the expected location
+    os.chmod(jobExecutablePath, 0o755)
+    result = subprocess.run(jobExecutablePath, shell=True, capture_output=True)
+
+    assert result.returncode == 2, result.stderr
+    assert result.stdout == b"", result.stdout
+    assert b"can't open file" in result.stderr, result.stderr
+
+    # 2. Execute the relocated executable file in a subprocess without relocating the files as they would be on the remote resource
+    # We expect it to fail because the relocated executable should not exist
+    os.chmod(jobExecutablePath, 0o755)
+    result = subprocess.run(jobExecutableRelocatedPath, shell=True, capture_output=True)
+
+    assert result.returncode == 127, result.stderr
+    assert result.stdout == b"", result.stdout
+    assert f"{jobExecutableRelocatedPath}: not found".encode() in result.stderr, result.stderr
+
+    # 3. Now we relocate the files as if they were on a remote resource and execute the relocated executable file in a subprocess
+    # We expect it to fail because the payload parameters are not available
+    shutil.copy(jobWrapperPath, rootLocation)
+    shutil.copy(jobWrapperConfigPath, rootLocation)
+    shutil.copy(jobExecutablePath, rootLocation)
+    os.chmod(jobExecutablePath, 0o755)
+
+    result = subprocess.run(jobExecutableRelocatedPath, shell=True, capture_output=True)
+
+    assert result.returncode == 1, result.stderr
+    assert b"Starting Job Wrapper Initialization for Job 1" not in result.stdout, result.stdout
+    assert result.stderr == b"", result.stderr
+
+    # 4. We recreate the job wrapper offline template with the payload params now
+    # We did not specify where the results and checksum should be stored, so we expect it to fail
+    res = createJobWrapper(
+        jobID=1,
+        jobParams=jobParams,
+        resourceParams=resourceParams,
+        optimizerParams=optimizerParams,
+        # This is the interesting part
+        defaultWrapperLocation="DIRAC/WorkloadManagementSystem/JobWrapper/JobWrapperOfflineTemplate.py",
+        pythonPath="python",
+        rootLocation=rootLocation,
+        extraOptions=extraOptions,
+        payloadParams=payloadParams,
+    )
+    assert res["OK"], res.get("Message")
+    jobWrapperPath = res["Value"].get("JobWrapperPath")
+    jobWrapperConfigPath = res["Value"].get("JobWrapperConfigPath")
+    jobExecutablePath = res["Value"].get("JobExecutablePath")
+
+    shutil.copy(jobWrapperPath, rootLocation)
+    shutil.copy(jobWrapperConfigPath, rootLocation)
+    shutil.copy(jobExecutablePath, rootLocation)
+    os.chmod(jobExecutablePath, 0o755)
+
+    result = subprocess.run(jobExecutableRelocatedPath, shell=True, capture_output=True)
+
+    assert result.returncode == 1, result.stderr
+    assert b"Starting Job Wrapper Initialization for Job 1" not in result.stdout, result.stdout
+    assert result.stderr == b"", result.stderr
+
+    # The root location should contain:
+    # - the job wrapper
+    # - the job wrapper configuration
+    # - the job executable
+    # - the job/Wrapper directory
+    print(os.listdir(rootLocation))
+    assert len(os.listdir(rootLocation)) == numberOfFiles + 4
+
+    # 5. We recreate the job wrapper offline template with the payload params and the additional job params
+    # It should work fine now
+    jobParams["PayloadResults"] = "payloadResults.json"
+    jobParams["Checksum"] = "checksum.json"
+
+    res = createJobWrapper(
+        jobID=1,
+        jobParams=jobParams,
+        resourceParams=resourceParams,
+        optimizerParams=optimizerParams,
+        # This is the interesting part
+        defaultWrapperLocation="DIRAC/WorkloadManagementSystem/JobWrapper/JobWrapperOfflineTemplate.py",
+        pythonPath="python",
+        rootLocation=rootLocation,
+        extraOptions=extraOptions,
+        payloadParams=payloadParams,
+    )
+    assert res["OK"], res.get("Message")
+    jobWrapperPath = res["Value"].get("JobWrapperPath")
+    jobWrapperConfigPath = res["Value"].get("JobWrapperConfigPath")
+    jobExecutablePath = res["Value"].get("JobExecutablePath")
+
+    shutil.copy(jobWrapperPath, rootLocation)
+    shutil.copy(jobWrapperConfigPath, rootLocation)
+    shutil.copy(jobExecutablePath, rootLocation)
+    os.chmod(jobExecutablePath, 0o755)
+
+    result = subprocess.run(jobExecutableRelocatedPath, shell=True, capture_output=True)
+
+    assert result.returncode == 0, result.stderr
+    assert b"Starting Job Wrapper Initialization for Job 1" in result.stdout, result.stdout
+    assert b"Job Wrapper is starting the processing phase for job" in result.stdout, result.stdout
+    assert result.stderr == b"", result.stderr
+
+    # The root location should contain:
+    # - the job wrapper
+    # - the job wrapper configuration
+    # - the job executable
+    # - the job/Wrapper directory
+    # - the <jobID> directory
+    assert len(os.listdir(rootLocation)) == numberOfFiles + 5
+    assert os.path.exists(os.path.join(rootLocation, "1"))
+    assert os.path.exists(os.path.join(rootLocation, "1", "payloadResults.json"))
+    assert os.path.exists(os.path.join(rootLocation, "1", "checksum.json"))
+
+    with open(os.path.join(rootLocation, "1", "payloadResults.json")) as f:
+        payloadResults = json.load(f)
+
+    assert payloadResults["OK"]
+    assert "cpuTimeConsumed" in payloadResults["Value"]
+    assert "payloadExecutorError" in payloadResults["Value"]
+    assert "payloadOutput" in payloadResults["Value"]
+    assert "payloadStatus" in payloadResults["Value"]
+
+    with open(os.path.join(rootLocation, "1", "checksum.json")) as f:
+        checksums = json.load(f)
+
+    assert jobParams["PayloadResults"] in checksums
+
+    os.unlink(os.path.join(rootLocation, os.path.basename(jobWrapperPath)))
+    os.unlink(os.path.join(rootLocation, os.path.basename(jobWrapperConfigPath)))
+    os.unlink(os.path.join(rootLocation, os.path.basename(jobExecutablePath)))
+    shutil.rmtree(os.path.join(rootLocation, "1"))
+    shutil.rmtree(os.path.join(os.getcwd(), "job"))

src/DIRAC/WorkloadManagementSystem/Utilities/Utils.py

@@ -14,6 +14,7 @@ def createJobWrapper(
     jobParams: dict,
     resourceParams: dict,
     optimizerParams: dict,
+    payloadParams: dict | None = None,
     extraOptions: str | None = None,
     wrapperPath: str | None = None,
     rootLocation: str | None = None,
@@ -29,11 +30,12 @@ def createJobWrapper(
     :param jobParams: Job parameters
     :param resourceParams: CE parameters
     :param optimizerParams: Optimizer parameters
+    :param payloadParams: Payload parameters
     :param extraOptions: Extra options to be passed to the job wrapper
     :param wrapperPath: Path where the job wrapper will be created
     :param rootLocation: Location where the job wrapper will be executed
-    :param defaultWrapperLocation: Location of the default job wrapper template
     :param pythonPath: Path to the python executable
+    :param defaultWrapperLocation: Location of the default job wrapper template
     :param log: Logger
     :param logLevel: Log level
     :return: S_OK with the path to the job wrapper and the path to the job wrapper json file
@@ -42,6 +44,8 @@ def createJobWrapper(
         extraOptions = f"--cfg {extraOptions}"
 
     arguments = {"Job": jobParams, "CE": resourceParams, "Optimizer": optimizerParams}
+    if payloadParams:
+        arguments["Payload"] = payloadParams
     log.verbose(f"Job arguments are: \n {arguments}")
 
     if not wrapperPath: