obspy.clients.seedlink.easyseedlink.EasySeedLinkClient

class EasySeedLinkClient(server_url, autoconnect=True)

Bases: object

An easy-to-use SeedLink client.

This class is meant to be used as a base class, with a subclass implementing one or more of the callbacks (most usefully the on_data() callback). See the ObsPy Tutorial for a detailed example.

Example

# Subclass the client class
class MyClient(EasySeedLinkClient):
    # Implement the on_data callback
    def on_data(self, trace):
        print('Received trace:')
        print(trace)

# Connect to a SeedLink server
client = MyClient('geofon.gfz-potsdam.de:18000')

# Retrieve INFO:STREAMS
streams_xml = client.get_info('STREAMS')
print(streams_xml)

# Select a stream and start receiving data
client.select_stream('BW', 'RJOB', 'EHZ')
client.run()

Implementation

The EasySeedLinkClient uses the SeedLinkConnection object. (It is not based on SLClient.)

Parameters

• server_url (str) – The SeedLink server URL

• autoconnect (bool) – Connect to the server when the client object is created; default is True.

Warning

The SeedLink connection only fails on connection errors if the connection was started explicitly, either when autoconnect is True or by calling connect() explicitly. Otherwise the client might get stuck in an infinite reconnect loop if there are connection problems (e.g. connect, timeout, reconnect, timeout, …). This might be intended behavior in some situations.

Attributes

capabilities

The server's capabilities, parsed from INFO:CAPABILITIES (cached).

Public Methods

close	Close the SeedLink connection.
connect	Connect to the SeedLink server.
get_info	Send a SeedLink INFO command and retrieve response.
has_capability	Check if the SeedLink server has a certain capability.
has_info_capability	A shortcut for checking for INFO capabilities.
on_data	Callback for handling the reception of waveform data.
on_seedlink_error	Callback for handling SeedLink errors.
on_terminate	Callback for handling connection termination.
run	Start streaming data from the SeedLink server.
select_stream	Select a stream for data transfer.

Private Methods

Warning

Private methods are mainly for internal/developer use and their API might change without notice.

EasySeedLinkClient._get_cat()

Send the CAT command to a server and receive the answer.

This can potentially be used for older SeedLink servers that don’t support the INFO:STREAMS command yet.

EasySeedLinkClient._send_and_recv(bytes_, stop_on=[b'END'])

Send a command to the server and read the response.

The response is read until a packet is received that ends with one of the provided stop words.

Warning

If the server doesn’t send one of the stop words, this never returns!

Parameters

• bytes (bytes) – The bytes to send to the server

• stop_on (list[str]) – A list of strings that indicate the end of the server response.

Return type

bytes

Returns

The server’s response

Special Methods

EasySeedLinkClient.__delattr__(name, /)

Implement delattr(self, name).

EasySeedLinkClient.__dir__()

Default dir() implementation.

EasySeedLinkClient.__eq__(value, /)

Return self==value.

EasySeedLinkClient.__format__(format_spec, /)

Default object formatter.

EasySeedLinkClient.__ge__(value, /)

Return self>=value.

EasySeedLinkClient.__getattribute__(name, /)

Return getattr(self, name).

EasySeedLinkClient.__gt__(value, /)

Return self>value.

EasySeedLinkClient.__hash__()

Return hash(self).

EasySeedLinkClient.__init__(server_url, autoconnect=True)

EasySeedLinkClient.__init_subclass__()

This method is called when a class is subclassed.

The default implementation does nothing. It may be overridden to extend subclasses.

EasySeedLinkClient.__le__(value, /)

Return self<=value.

EasySeedLinkClient.__lt__(value, /)

Return self<value.

EasySeedLinkClient.__ne__(value, /)

Return self!=value.

EasySeedLinkClient.__new__(**kwargs)

EasySeedLinkClient.__reduce__()

Helper for pickle.

EasySeedLinkClient.__reduce_ex__(protocol, /)

Helper for pickle.

EasySeedLinkClient.__repr__()

Return repr(self).

EasySeedLinkClient.__setattr__(name, value, /)

Implement setattr(self, name, value).

EasySeedLinkClient.__sizeof__()

Size of object in memory, in bytes.

EasySeedLinkClient.__str__()

Return str(self).

EasySeedLinkClient.__subclasshook__()

Abstract classes can override this to customize issubclass().

This is invoked early on by abc.ABCMeta.__subclasscheck__(). It should return True, False or NotImplemented. If it returns NotImplemented, the normal algorithm is used. Otherwise, it overrides the normal algorithm (and the outcome is cached).