使用Python API Client for Grakn加载数据时出现问题

问题描述

我正在使用Grakn 1.8.1，python 3.6.8，grakn-client 1.8.1和grpcio 1.24.1。

我定义了一个简单的架构（schema.gql）来执行测试：

define

nome sub attribute,value string;

cpf_srfb sub attribute,value string;

id_srfb sub attribute,value string;

hops_de_contraparte sub attribute,value string;

pessoa_fisica sub entity,has nome,has cpf_srfb,has id_srfb,has hops_de_contraparte;

此方案已使用grakn控制台正确加载，并且键空间称为“ srfb”。

之后，我创建了一个仅包含一个实例的数据文件（data.sql）：

insert $pf isa pessoa_fisica,has nome "GUSTAVO RIBEIRO SOARES PINTO",has cpf_srfb "***106887**",has id_srfb "***106887**GUSTAVO RIBEIRO SOARES PINTO",has hops_de_contraparte "5";

同样，使用grakn-console可以完美地进行数据加载。

当我通过控制台加载架构，然后尝试通过python api加载数据时，会发生问题。

我的python脚本就是：

from grakn.client import GraknClient

uri = "localhost:48555"
keyspace = 'srfb'
filepath = 'C:\grakn\grakn_181\data.gql'

with open(filepath,mode='r') as file:
    insert_query = file.read()

with GraknClient(uri) as client:
    with client.session(keyspace) as session:
        with session.transaction().write() as transaction:
            transaction.query(insert_query)
            transaction.commit()

那时，发生了我无法纠正的错误：

Traceback (most recent call last):
  File "C:\Users\jorge\AppData\Local\Programs\Python\Python36\lib\site-packages\grakn\service\Session\util\Communicator.py",line 166,in _block_for_next
    response = next(self._response_iterator)
  File "C:\Users\jorge\AppData\Local\Programs\Python\Python36\lib\site-packages\grpc\_channel.py",line 388,in __next__
    return self._next()
  File "C:\Users\jorge\AppData\Local\Programs\Python\Python36\lib\site-packages\grpc\_channel.py",line 382,in _next
    raise self
grpc._channel._Rendezvous: <_Rendezvous of RPC that terminated with:
        status = StatusCode.UNKNOWN
        details = "grakn.core.kb.graql.exception.GraqlSemanticException: hops_de_contraparte doesn't have an 'isa',a 'sub' or an 'id'. Please check server logs for the stack trace."
        debug_error_string = "{"created":"@1603911191.241000000","description":"Error received from peer ipv6:[::1]:48555","file":"src/core/lib/surface/call.cc","file_line":1055,"grpc_message":"grakn.core.kb.graql.exception.GraqlSemanticException: hops_de_contraparte doesn't have an 'isa',a 'sub' or an 'id'. Please check server logs for the stack trace.","grpc_status":2}"
>

During handling of the above exception,another exception occurred:

Traceback (most recent call last):
  File "teste.py",line 17,in <module>
    transaction.commit()
  File "C:\Users\jorge\AppData\Local\Programs\Python\Python36\lib\site-packages\grakn\client.py",line 160,in commit
    self._tx_service.commit()
  File "C:\Users\jorge\AppData\Local\Programs\Python\Python36\lib\site-packages\grakn\service\Session\TransactionService.py",line 54,in commit
    self._communicator.single_request(request)
  File "C:\Users\jorge\AppData\Local\Programs\Python\Python36\lib\site-packages\grakn\service\Session\util\Communicator.py",line 192,in single_request
    return SingleResolver(self,request).get()
  File "C:\Users\jorge\AppData\Local\Programs\Python\Python36\lib\site-packages\grakn\service\Session\util\Communicator.py",line 70,in get
    response = self._communicator._block_for_next(self)
  File "C:\Users\jorge\AppData\Local\Programs\Python\Python36\lib\site-packages\grakn\service\Session\util\Communicator.py",line 184,in _block_for_next
    raise self._error
grakn.exception.GraknError.GraknError: Server/network error: <_Rendezvous of RPC that terminated with:
        status = StatusCode.UNKNOWN
        details = "grakn.core.kb.graql.exception.GraqlSemanticException: hops_de_contraparte doesn't have an 'isa',"grpc_status":2}"
>

 generated from request: iter_req {
  options {
  }
  query_iter_req {
    query: "insert $pf isa pessoa_fisica,has nome \"GUSTAVO RIBEIRO SOARES PINTO\",has cpf_srfb \"***106887**\",has id_srfb \"***106887**GUSTAVO RIBEIRO SOARES PINTO\",has hops_de_contraparte \"5\";"
    options {
    }
  }
}

grakn日志显示以下记录：

2020-10-28 15:15:45,615 [grpc-request-handler-3] ERROR g.c.s.r.SessionService$TransactionListener - Runtime Exception in RPC TransactionListener: 
java.util.concurrent.ExecutionException: grakn.core.kb.graql.exception.GraqlSemanticException: hops_de_contraparte doesn't have an 'isa',a 'sub' or an 'id'
    at java.util.concurrent.FutureTask.report(Unknown Source)
    at java.util.concurrent.FutureTask.get(Unknown Source)
    at grakn.core.server.rpc.SessionService$TransactionListener.process(SessionService.java:319)
    at grakn.core.server.rpc.SessionService$TransactionListener.onNext(SessionService.java:196)
    at grakn.core.server.rpc.SessionService$TransactionListener.onNext(SessionService.java:156)
    at io.grpc.stub.ServerCalls$StreamingServerCallHandler$StreamingServerCallListener.onMessage(ServerCalls.java:251)
    at io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.messagesAvailableInternal(ServerCallImpl.java:309)
    at io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.messagesAvailable(ServerCallImpl.java:292)
    at io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1MessagesAvailable.runInContext(ServerImpl.java:779)
    at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
    at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: grakn.core.kb.graql.exception.GraqlSemanticException: hops_de_contraparte doesn't have an 'isa',a 'sub' or an 'id'

最初，我认为属性的声明存在问题，但事实并非如此，因为同一插入可以通过控制台完美地工作。

我该怎么做才能使用python API？有人知道我可能在做错什么吗？

解决方法

如果您不从文件中读取文件，而直接设置插入查询，是否可以正常工作？

insert_query ="insert $pf isa pessoa_fisica,has nome \"GUSTAVO RIBEIRO SOARES PINTO\",has cpf_srfb \"***106887**\",has id_srfb \"***106887**GUSTAVO RIBEIRO SOARES PINTO\",has hops_de_contraparte \"5\";"

,

从已经通过控制台正确加载所有内容的事实中已经知道，您没有做任何明显的错误！

此消息：

hops_de_contraparte doesn't have an 'isa',a 'sub' or an 'id'

可以肯定地表明您从python客户端访问的键空间没有定义为hops_de_contraparte的类型。您从控制台访问的键空间可能与从客户端访问的键空间不同。因此，请仔细检查以确保在使用控制台加载架构时，您正在使用-k参数来提供键空间，例如：.\grakn console -k srfb -f 'C:\grakn\grakn_181\schema.gql，以便它与用于客户端的键空间匹配。 / p>

如果失败，请尝试更改您要删除的hops_de_contraparte查询，以查看是否是未定义的特定类型。按照Banjo的建议进行操作，然后尝试首先从Python字符串传递查询。

,

我清理了键空间，重新启动了所有过程，脚本正常运行。我不知道问题是什么，但问题已解决。感谢James和Banjo的帮助。