def frame_callback(frame, binary):
if not binary:
frame = frame.encode("utf-8")
if command['kind'] == 'console':
console.write(frame)
console_publish(context['cluster'], {'job_id':command['test_id'], 'msg':frame})
console.flush()
else:
console_publish(context['cluster'], {'job_id':command['test_id'], 'ctl':'IN_PROGRESS'})
sha.update(frame)
tmp.write(frame)
def frame_callback(frame, binary):
if not binary:
frame = frame.encode("utf-8")
if command['kind'] == 'console':
console.write(frame)
console_publish(context['cluster'], {
'job_id': command['test_id'],
'msg': frame
})
console.flush()
else:
console_publish(context['cluster'], {
'job_id': command['test_id'],
'ctl': 'IN_PROGRESS'
})
sha.update(frame)
tmp.write(frame)
def cluster_comms(ws):
"""Websocket to communicate with the test clusters
Commands are logical actions one end of the socket wishes the
other end to take. Responses are follow ups to a command, which
there can be multiple, back and forth between client and server
until the receiving end marks a response as Done.
Command structure:
{type:'command',
command_id:'some unique string for this command',
message:'some message to the other end',
action:'some action for the receiver to take',
// Extra parameters:
foo: ...,
bar: ...,
}
Response structure:
{type:'response',
command_id:'the command id this is a response to',
message:'some message to the other end',
done: true/false (the responder considers the command complete)
// Extra parameters:
foo: ...,
bar: ...,
}
Possible commands:
* authenticate - server asks client to authenticate
* get_work - client asks for a test
* test_done - client is done with a test, and sending artifacts
* cancel_test - server asks client to cancel test
* shutdown - server asks client to shutdown service
Protocol:
Authentication:
* client initiates connection to this server
* server sends client a random challenge token
{type:'command', command_id='zzzz', action:'authenticate', token:'xxxxxxx'}
* client signs challenge token with it's private key ands sends the signature
{type:'response', command_id='zzz', cluster:'bdplab', signature:'xxxxxxxx'}
* server verifies the signature is against the token it sent and the public
key it has on file for the cluster.
* server sends a 'you are authenticated' response.
{type:'response', command_id='zzz', authenticated: true, done:true}
Task loop:
* client sends a 'give me work' request.
{type:'command', command_id='yyy', action:'get_work'}
* server sends a 'ok, wait for work' response.
{type:'response', command_id='yyy', action:'wait'}
* server sends a single test to the cluster
{type:'response', command_id='yyy', test:{...}}
* client responds 'ok, received test' response
{type:'response', command_id:'yyy', test_id:'xxxxxxx'}
* server updates status of test to in_progress in database
{type:'response', command_id:'yyy', message:'test_updated', done:true}
* client sends artifacts via streaming protocol (See below)
* client sends 'ok, test done, artifacts sent.' request.
{type:'command', command_id:'llll', action:'test_done', test_id:'xxxxxxx'}
* server updates status of test to completed
* server sends a 'ok, test updated' response
{type:'response', command_id:'llll', test_id:'xxxxxx', message='test_update', done:true}
Streaming:
protocol for streaming raw data: console output, binary artifacts etc.
* Sending peer sends a "I'm going to send binary data to you" request:
{type:'command', command_id='xxx', action:'stream', test_id='xxxxx',
kind:"[console|failure|chart|system_logs|stress_logs]", name='name',
eof='$$$EOF$$$', keepalive='$$$KEEPALIVE$$$'}
* Receiving peer sends response indicating it's ready to receive the stream:
{type:'response', command_id='xxx', action='ready'}
* Peer starts sending arbitrary binary data messages.
* The receiving peer reads binary data. If it encounters $$$KEEPALIVE$$$ as it's own message, it will
omit that data, as it's only meant to keep the socket open.
* Once $$$EOF$$$ is seen by the receiving peer, in it's own message, the receiving peer can respond:
{type:'response', command_id='xxx', message:'stream_received', done:true}
"""
context = {'apikey': APIKey.load(SERVER_KEY_PATH),
'cluster': None}
def authenticate():
token_to_sign = random_token()
cmd = Command.new(ws, action='authenticate', token=token_to_sign)
response = cmd.send()
context['cluster'] = cluster = response['cluster']
client_pubkey = db.get_pub_key(cluster)
client_apikey = APIKey(client_pubkey['pubkey'])
# Verify the client correctly signed the token:
try:
client_apikey.verify_message(token_to_sign, response.get('signature'))
except:
response.respond(message='Bad Signature of token for authentication', done=True)
log.error('client provided bad signature for auth token')
raise
response.respond(authenticated=True, done=True)
# Client will ask us to authenticate too:
command = receive_data(ws)
assert command.get('action') == 'authenticate'
data = {'signature' :context['apikey'].sign_message(command['token'])}
response = command.respond(**data)
if response.get('authenticated') != True:
raise UnauthenticatedError("Our peer could not validate our signed auth token")
def get_work(command):
# Mark any existing in_process jobs for this cluster as
# failed. If the cluster is asking for new work, then these
# got dropped on the floor:
for test in db.get_in_progress_tests(context['cluster']):
db.update_test_status(test['test_id'], 'failed')
# Find the next test scheduled for the client's cluster:
tests = db.get_scheduled_tests(context['cluster'], limit=1)
if len(tests) > 0:
test_id = tests[0]['test_id']
else:
# No tests are currently scheduled.
# Register a zmq listener of notifications of incoming tests, with a timeout.
# When we see any test scheduled notification for our cluster, redo the query.
# If timeout reached, redo the query anyway in case we missed the notification.
def setup_zmq():
zmq_context = zmq.Context()
zmq_socket = zmq_context.socket(zmq.SUB)
zmq_socket.connect('tcp://127.0.0.1:5557')
zmq_socket.setsockopt_string(
zmq.SUBSCRIBE,
unicode('scheduled {cluster} '.format(cluster=context['cluster'])))
zmq_socket.setsockopt(zmq.RCVTIMEO, 15000)
return zmq_socket
zmq_socket = setup_zmq()
while True:
try:
cluster, test_id = zmq_socket.recv_string().split()
except zmq.error.Again:
pass
except zmq.error.ZMQError, e:
if e.errno == zmq.POLLERR:
log.error(e)
# Interrupted zmq socket code, reinitialize:
# I get this when I resize my terminal.. WTF?
zmq_socket = setup_zmq()
finally:
tests = db.get_scheduled_tests(context['cluster'], limit=1)
if len(tests) > 0:
test_id = tests[0]['test_id']
break
else:
# Send no-work-yet message:
console_publish(context['cluster'], {'ctl':'WAIT'})
command.respond(action='wait', follow_up=False)
# responsibility to resend artifacts that failed.
db.update_test_artifact(command['test_id'], command['kind'], tmp, command['name'])
command.respond(message='stream_received', done=True, sha256=sha.hexdigest())
# Client and Server both authenticate to eachother:
authenticate()
try:
# Dispatch on client commands:
while True:
command = receive_data(ws)
assert command['type'] == 'command'
if command['action'] == 'get_work':
console_publish(context['cluster'], {'ctl':'WAIT'})
get_work(command)
elif command['action'] == 'test_done':
console_publish(context['cluster'], {'ctl':'DONE'})
test_done(command)
elif command['action'] == 'stream':
receive_stream(command)
elif command['action'] == 'chunk-stream-query':
receive_artifact_chunk_query(command)
elif command['action'] == 'chunk-stream':
receive_artifact_chunk_object(command)
elif command['action'] == 'chunk-stream-complete':
receive_artifact_chunk_complete(command)
elif command['action'] == 'good_bye':
log.info("client said good_bye. Closing socket.")
break
def cluster_comms(ws):
"""Websocket to communicate with the test clusters
Commands are logical actions one end of the socket wishes the
other end to take. Responses are follow ups to a command, which
there can be multiple, back and forth between client and server
until the receiving end marks a response as Done.
Command structure:
{type:'command',
command_id:'some unique string for this command',
message:'some message to the other end',
action:'some action for the receiver to take',
// Extra parameters:
foo: ...,
bar: ...,
}
Response structure:
{type:'response',
command_id:'the command id this is a response to',
message:'some message to the other end',
done: true/false (the responder considers the command complete)
// Extra parameters:
foo: ...,
bar: ...,
}
Possible commands:
* authenticate - server asks client to authenticate
* get_work - client asks for a test
* test_done - client is done with a test, and sending artifacts
* cancel_test - server asks client to cancel test
* shutdown - server asks client to shutdown service
Protocol:
Authentication:
* client initiates connection to this server
* server sends client a random challenge token
{type:'command', command_id='zzzz', action:'authenticate', token:'xxxxxxx'}
* client signs challenge token with it's private key ands sends the signature
{type:'response', command_id='zzz', cluster:'bdplab', signature:'xxxxxxxx'}
* server verifies the signature is against the token it sent and the public
key it has on file for the cluster.
* server sends a 'you are authenticated' response.
{type:'response', command_id='zzz', authenticated: true, done:true}
Task loop:
* client sends a 'give me work' request.
{type:'command', command_id='yyy', action:'get_work'}
* server sends a 'ok, wait for work' response.
{type:'response', command_id='yyy', action:'wait'}
* server sends a single test to the cluster
{type:'response', command_id='yyy', test:{...}}
* client responds 'ok, received test' response
{type:'response', command_id:'yyy', test_id:'xxxxxxx'}
* server updates status of test to in_progress in database
{type:'response', command_id:'yyy', message:'test_updated', done:true}
* client sends artifacts via streaming protocol (See below)
* client sends 'ok, test done, artifacts sent.' request.
{type:'command', command_id:'llll', action:'test_done', test_id:'xxxxxxx'}
* server updates status of test to completed
* server sends a 'ok, test updated' response
{type:'response', command_id:'llll', test_id:'xxxxxx', message='test_update', done:true}
Streaming:
protocol for streaming raw data: console output, binary artifacts etc.
* Sending peer sends a "I'm going to send binary data to you" request:
{type:'command', command_id='xxx', action:'stream', test_id='xxxxx',
kind:"[console|failure|chart|system_logs|stress_logs]", name='name',
eof='$$$EOF$$$', keepalive='$$$KEEPALIVE$$$'}
* Receiving peer sends response indicating it's ready to receive the stream:
{type:'response', command_id='xxx', action='ready'}
* Peer starts sending arbitrary binary data messages.
* The receiving peer reads binary data. If it encounters $$$KEEPALIVE$$$ as it's own message, it will
omit that data, as it's only meant to keep the socket open.
* Once $$$EOF$$$ is seen by the receiving peer, in it's own message, the receiving peer can respond:
{type:'response', command_id='xxx', message:'stream_received', done:true}
"""
context = {'apikey': APIKey.load(SERVER_KEY_PATH), 'cluster': None}
def authenticate():
token_to_sign = random_token()
cmd = Command.new(ws, action='authenticate', token=token_to_sign)
response = cmd.send()
context['cluster'] = cluster = response['cluster']
client_pubkey = db.get_pub_key(cluster)
client_apikey = APIKey(client_pubkey['pubkey'])
# Verify the client correctly signed the token:
try:
client_apikey.verify_message(token_to_sign,
response.get('signature'))
except:
response.respond(
message='Bad Signature of token for authentication', done=True)
log.error('client provided bad signature for auth token')
raise
response.respond(authenticated=True, done=True)
# Client will ask us to authenticate too:
command = receive_data(ws)
assert command.get('action') == 'authenticate'
data = {'signature': context['apikey'].sign_message(command['token'])}
response = command.respond(**data)
if response.get('authenticated') != True:
raise UnauthenticatedError(
"Our peer could not validate our signed auth token")
def get_work(command):
# Mark any existing in_process jobs for this cluster as
# failed. If the cluster is asking for new work, then these
# got dropped on the floor:
for test in db.get_in_progress_tests(context['cluster']):
db.update_test_status(test['test_id'], 'failed')
# Find the next test scheduled for the client's cluster:
tests = db.get_scheduled_tests(context['cluster'], limit=1)
if len(tests) > 0:
test_id = tests[0]['test_id']
else:
# No tests are currently scheduled.
# Register a zmq listener of notifications of incoming tests, with a timeout.
# When we see any test scheduled notification for our cluster, redo the query.
# If timeout reached, redo the query anyway in case we missed the notification.
def setup_zmq():
zmq_context = zmq.Context()
zmq_socket = zmq_context.socket(zmq.SUB)
zmq_socket.connect('tcp://127.0.0.1:5557')
zmq_socket.setsockopt_string(
zmq.SUBSCRIBE,
unicode('scheduled {cluster} '.format(
cluster=context['cluster'])))
zmq_socket.setsockopt(zmq.RCVTIMEO, 15000)
return zmq_socket
zmq_socket = setup_zmq()
while True:
try:
cluster, test_id = zmq_socket.recv_string().split()
except zmq.error.Again:
pass
except zmq.error.ZMQError, e:
if e.errno == zmq.POLLERR:
log.error(e)
# Interrupted zmq socket code, reinitialize:
# I get this when I resize my terminal.. WTF?
zmq_socket = setup_zmq()
finally:
tests = db.get_scheduled_tests(context['cluster'], limit=1)
if len(tests) > 0:
test_id = tests[0]['test_id']
break
else:
# Send no-work-yet message:
console_publish(context['cluster'], {'ctl': 'WAIT'})
command.respond(action='wait', follow_up=False)
# responsibility to resend artifacts that failed.
db.update_test_artifact(command['test_id'], command['kind'], tmp,
command['name'])
command.respond(message='stream_received',
done=True,
sha256=sha.hexdigest())
# Client and Server both authenticate to eachother:
authenticate()
try:
# Dispatch on client commands:
while True:
command = receive_data(ws)
assert command['type'] == 'command'
if command['action'] == 'get_work':
console_publish(context['cluster'], {'ctl': 'WAIT'})
get_work(command)
elif command['action'] == 'test_done':
console_publish(context['cluster'], {'ctl': 'DONE'})
test_done(command)
elif command['action'] == 'stream':
receive_stream(command)
elif command['action'] == 'good_bye':
log.info("client said good_bye. Closing socket.")
break
finally:
console_publish(context['cluster'], {'ctl': 'GOODBYE'})
