如何在python中的Google Cloud Firestore中创建条目以作为时间戳

debugcn 发表于 Dev

网skink

我有一个基于python 3.7的云功能。自纪元以来，我有一个秒数的值。我可以为文档添加一系列条目，例如字符串，整数等。但是我无法添加时间戳。

这是一个简单的代码片段。

db = firestore.Client(project=project_id)

# the event dictionary already has some values in it.  Add a timestamp.
#

# This is a reference to javascript api.  Oddly enough this page does not have
# python listed.
# https://firebase.google.com/docs/reference/js/firebase.firestore.Timestamp
#
# This will add a timestamp as a string value.
event['mqtt_timestamp_rfc3339'] = mqtt_timestamp_rfc3339 # add the timestamp as a string

# this adds a the value as a number of seconds since epoch
event['timestamp_secs'] = mqtt_timestamp  # add the timestamp as timestamp class

# This fails.
# firestore.types.Value.timestamp_value(seconds=mqtt_timestamp.timestamp())  

# This actually updates the collection
doc_ref = db.collection(u'sensor-data').add(event)

到目前为止，与示例代码相比，我唯一看到的就是添加一个时间戳，该时间戳似乎是服务器时间。在这种情况下，我有一个将其信息中继到第二个设备的设备，第二个设备又将其更新为pub / sub。我真的不在乎何时调用云函数。我想知道第一台设备何时生成了事件，而这可能要花几分钟的时间。

网skink

此方法适用于使用python 3.7的云功能。

doit():

    # stuff snipped for brevity

    # unpack timestamp as string from buffer
    mqtt_timestamp_str = mqtt_timestamp_bytes.decode("utf-8")
    # generate timestamp from string
    mqtt_timestamp = datetime.fromisoformat(mqtt_timestamp_str)
    # create as RFC339 string
    mqtt_timestamp_rfc3339 = rfc3339(mqtt_timestamp, utc=True, use_system_timezone=False)

    # stuff snipped. event is a dictionary with stuff to put in firebase

    # add the timestamp as RFC339 String
    event['mqtt_timestamp_rfc3339'] = mqtt_timestamp_rfc3339 
    event['timestamp'] = mqtt_timestamp  

    # update firebase
    doc_ref = db.collection(u'sensor-data').add(event)

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