python rq - 如何在完成多个其他作业时触发作业？多工作依赖工作？

Question

我的 python redis 队列中有一个嵌套的作业结构。首先执行 rncopy 作业。完成后，接下来是 3 个相关的注册作业。当所有这 3 个作业的计算完成后，我想触发一个作业向我的前端发送 websocket 通知。

我目前的尝试:

    rncopy = redisqueue.enqueue(raw_nifti_copymachine, patientid, imagepath, timeout=6000)
    t1c_reg = redisqueue.enqueue(modality_registrator, patientid, "t1c", timeout=6000, depends_on=rncopy)
    t2_reg = redisqueue.enqueue(modality_registrator, patientid, "t2", timeout=6000, depends_on=rncopy)
    fla_reg = redisqueue.enqueue(modality_registrator, patientid, "fla", timeout=6000, depends_on=rncopy)
    notify = redisqueue.enqueue(print, patient_finished, patientid, timeout=6000, depends_on=(t1c_reg, t2_reg, fla_reg))

不幸的是，似乎多作业依赖功能从未合并到主版本中。我看到目前 git 上有两个拉取请求。有我可以使用的解决方法吗？

很抱歉未能提供可重现的示例。

Answer 1

我创建了一个“rq-manager”来解决具有多个和树状依赖项的类似问题:
https://github.com/crispyDyne/rq-manager
具有多个依赖项的项目结构如下所示。

def simpleTask(x):
    return 2*x

project = {'jobs':[
            {
                'blocking':True, # this job must finished before moving on.
                'func':simpleTask,'args': 0
            },
            {
                'blocking':True, # this job, and its child jobs, must finished before moving on.
                'jobs':[ # these child jobs will run in parallel
                    {'func':simpleTask,'args': 1},
                    {'func':simpleTask,'args': 2},
                    {'func':simpleTask,'args': 3}],
            },
            { # this job will only run when the blocking jobs above finish.
                'func':simpleTask,'args': 4
            }
        ]}

然后交给管理员完成。

from rq_manager import manager, getProjectResults

managerJob = q.enqueue(manager,project)
projectResults = getProjectResults(managerJob)

返回

projectResults = [0, [2, 4, 6], 8]

当依赖作业需要父级的结果时。我创建了一个执行第一个作业的函数，然后向项目添加其他作业。所以对于你的例子:

def firstTask(patientid,imagepath):

    raw_nifti_result  = raw_nifti_copymachine(patientid,imagepath)

    moreTasks = {'jobs':[
        {'func':modality_registrator,'args':(patientid, "t1c", raw_nifti_result)},
        {'func':modality_registrator,'args':(patientid, "t2", raw_nifti_result)},
        {'func':modality_registrator,'args':(patientid, "fla", raw_nifti_result)},
    ]}

    # returning a dictionary with an "addJobs" will add those tasks to the project. 
    return {'result':raw_nifti_result, 'addJobs':moreTasks}

该项目将如下所示:

project = {'jobs':[
            {'blocking':True, # this job, and its child jobs, must finished before moving on.
             'jobs':[
                {
                    'func':firstTask, 'args':(patientid, imagepath)
                    'blocking':True, # this job must finished before moving on.
                },
                # "moreTasks" will be added here
                ]
            }
            { # this job will only run when the blocking jobs above finish.
                'func':print,'args': (patient_finished, patientid)
            }
        ]}

如果最终作业需要先前作业的结果，则设置“previousJobArgs”标志。 “finalJob” 将接收一个包含先前结果的数组及其子作业结果的嵌套数组。

def finalJob(previousResults):
    # previousResults = [ 
    #     raw_nifti_copymachine(patientid,imagepath),
    #     [
    #         modality_registrator(patientid, "t1c", raw_nifti_result),
    #         modality_registrator(patientid, "t2", raw_nifti_result),
    #         modality_registrator(patientid, "fla", raw_nifti_result),
    #     ]
    # ]
    return doSomethingWith(previousResults)

然后项目看起来像这样

project = {'jobs':[
            {
             #'blocking':True, # Blocking not needed.
             'jobs':[
                {
                    'func':firstTask, 'args':(patientid, imagepath)
                    'blocking':True, # this job must finished before moving on.
                },
                # "moreTasks" will be added here
                ]
            }
            { # This job will wait, since it needs the previous job's results. 
                'func':finalJob, 'previousJobArgs': True # it gets all the previous jobs results
            }
        ]}

希望 https://github.com/rq/rq/issues/260已实现，我的解决方案将过时!