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"""
Connection module for Amazon Kinesis
.. versionadded:: 2017.7.0
:configuration: This module accepts explicit Kinesis credentials but can also
utilize IAM roles assigned to the instance trough Instance Profiles.
Dynamic credentials are then automatically obtained from AWS API and no
further configuration is necessary. More Information available at:
.. code-block:: text
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/iam-roles-for-amazon-ec2.html
If IAM roles are not used you need to specify them either in a pillar or
in the minion's config file:
.. code-block:: yaml
kinesis.keyid: GKTADJGHEIQSXMKKRBJ08H
kinesis.key: askdjghsdfjkghWupUjasdflkdfklgjsdfjajkghs
A region may also be specified in the configuration:
.. code-block:: yaml
kinesis.region: us-east-1
If a region is not specified, the default is us-east-1.
It's also possible to specify key, keyid and region via a profile, either
as a passed in dict, or as a string to pull from pillars or minion config:
.. code-block:: yaml
myprofile:
keyid: GKTADJGHEIQSXMKKRBJ08H
key: askdjghsdfjkghWupUjasdflkdfklgjsdfjajkghs
region: us-east-1
:depends: boto3
"""
# keep lint from choking on _get_conn
# pylint: disable=E0602
import logging
import random
import time
import salt.utils.versions
# pylint: disable=unused-import
try:
import boto3
import botocore
logging.getLogger("boto3").setLevel(logging.CRITICAL)
HAS_BOTO = True
except ImportError:
HAS_BOTO = False
# pylint: enable=unused-import
log = logging.getLogger(__name__)
__virtualname__ = "boto_kinesis"
def __virtual__():
"""
Only load if boto3 libraries exist.
"""
has_boto_reqs = salt.utils.versions.check_boto_reqs()
if has_boto_reqs is True:
__utils__["boto3.assign_funcs"](__name__, "kinesis")
return __virtualname__
return has_boto_reqs
def _get_basic_stream(stream_name, conn):
"""
Stream info from AWS, via describe_stream
Only returns the first "page" of shards (up to 100); use _get_full_stream() for all shards.
CLI Example:
.. code-block:: bash
salt myminion boto_kinesis._get_basic_stream my_stream existing_conn
"""
return _execute_with_retries(conn, "describe_stream", StreamName=stream_name)
def _get_full_stream(stream_name, region=None, key=None, keyid=None, profile=None):
"""
Get complete stream info from AWS, via describe_stream, including all shards.
CLI Example:
.. code-block:: bash
salt myminion boto_kinesis._get_full_stream my_stream region=us-east-1
"""
conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
r = {}
stream = _get_basic_stream(stream_name, conn)["result"]
full_stream = stream
# iterate through if there are > 100 shards (max that AWS will return from describe_stream)
while stream["StreamDescription"]["HasMoreShards"]:
stream = _execute_with_retries(
conn,
"describe_stream",
StreamName=stream_name,
ExclusiveStartShardId=stream["StreamDescription"]["Shards"][-1]["ShardId"],
)
stream = stream["result"]
full_stream["StreamDescription"]["Shards"] += stream["StreamDescription"][
"Shards"
]
r["result"] = full_stream
return r
def get_stream_when_active(
stream_name, region=None, key=None, keyid=None, profile=None
):
"""
Get complete stream info from AWS, returning only when the stream is in the ACTIVE state.
Continues to retry when stream is updating or creating.
If the stream is deleted during retries, the loop will catch the error and break.
CLI Example:
.. code-block:: bash
salt myminion boto_kinesis.get_stream_when_active my_stream region=us-east-1
"""
conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
stream_status = None
# only get basic stream until it's active,
# so we don't pull the full list of shards repeatedly (in case of very large stream)
attempt = 0
max_retry_delay = 10
while stream_status != "ACTIVE":
time.sleep(_jittered_backoff(attempt, max_retry_delay))
attempt += 1
stream_response = _get_basic_stream(stream_name, conn)
if "error" in stream_response:
return stream_response
stream_status = stream_response["result"]["StreamDescription"]["StreamStatus"]
# now it's active, get the full stream if necessary
if stream_response["result"]["StreamDescription"]["HasMoreShards"]:
stream_response = _get_full_stream(stream_name, region, key, keyid, profile)
return stream_response
def exists(stream_name, region=None, key=None, keyid=None, profile=None):
"""
Check if the stream exists. Returns False and the error if it does not.
CLI Example:
.. code-block:: bash
salt myminion boto_kinesis.exists my_stream region=us-east-1
"""
conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
r = {}
stream = _get_basic_stream(stream_name, conn)
if "error" in stream:
r["result"] = False
r["error"] = stream["error"]
else:
r["result"] = True
return r
def create_stream(
stream_name, num_shards, region=None, key=None, keyid=None, profile=None
):
"""
Create a stream with name stream_name and initial number of shards num_shards.
CLI Example:
.. code-block:: bash
salt myminion boto_kinesis.create_stream my_stream N region=us-east-1
"""
conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
r = _execute_with_retries(
conn, "create_stream", ShardCount=num_shards, StreamName=stream_name
)
if "error" not in r:
r["result"] = True
return r
def delete_stream(stream_name, region=None, key=None, keyid=None, profile=None):
"""
Delete the stream with name stream_name. This cannot be undone! All data will be lost!!
CLI Example:
.. code-block:: bash
salt myminion boto_kinesis.delete_stream my_stream region=us-east-1
"""
conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
r = _execute_with_retries(conn, "delete_stream", StreamName=stream_name)
if "error" not in r:
r["result"] = True
return r
def increase_stream_retention_period(
stream_name, retention_hours, region=None, key=None, keyid=None, profile=None
):
"""
Increase stream retention period to retention_hours
CLI Example:
.. code-block:: bash
salt myminion boto_kinesis.increase_stream_retention_period my_stream N region=us-east-1
"""
conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
r = _execute_with_retries(
conn,
"increase_stream_retention_period",
StreamName=stream_name,
RetentionPeriodHours=retention_hours,
)
if "error" not in r:
r["result"] = True
return r
def decrease_stream_retention_period(
stream_name, retention_hours, region=None, key=None, keyid=None, profile=None
):
"""
Decrease stream retention period to retention_hours
CLI Example:
.. code-block:: bash
salt myminion boto_kinesis.decrease_stream_retention_period my_stream N region=us-east-1
"""
conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
r = _execute_with_retries(
conn,
"decrease_stream_retention_period",
StreamName=stream_name,
RetentionPeriodHours=retention_hours,
)
if "error" not in r:
r["result"] = True
return r
def enable_enhanced_monitoring(
stream_name, metrics, region=None, key=None, keyid=None, profile=None
):
"""
Enable enhanced monitoring for the specified shard-level metrics on stream stream_name
CLI Example:
.. code-block:: bash
salt myminion boto_kinesis.enable_enhanced_monitoring my_stream ["metrics", "to", "enable"] region=us-east-1
"""
conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
r = _execute_with_retries(
conn,
"enable_enhanced_monitoring",
StreamName=stream_name,
ShardLevelMetrics=metrics,
)
if "error" not in r:
r["result"] = True
return r
def disable_enhanced_monitoring(
stream_name, metrics, region=None, key=None, keyid=None, profile=None
):
"""
Disable enhanced monitoring for the specified shard-level metrics on stream stream_name
CLI Example:
.. code-block:: bash
salt myminion boto_kinesis.disable_enhanced_monitoring my_stream ["metrics", "to", "disable"] region=us-east-1
"""
conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
r = _execute_with_retries(
conn,
"disable_enhanced_monitoring",
StreamName=stream_name,
ShardLevelMetrics=metrics,
)
if "error" not in r:
r["result"] = True
return r
def get_info_for_reshard(stream_details):
"""
Collect some data: number of open shards, key range, etc.
Modifies stream_details to add a sorted list of OpenShards.
Returns (min_hash_key, max_hash_key, stream_details)
CLI Example:
.. code-block:: bash
salt myminion boto_kinesis.get_info_for_reshard existing_stream_details
"""
min_hash_key = 0
max_hash_key = 0
stream_details["OpenShards"] = []
for shard in stream_details["Shards"]:
shard_id = shard["ShardId"]
if "EndingSequenceNumber" in shard["SequenceNumberRange"]:
# EndingSequenceNumber is null for open shards, so this shard must be closed
log.debug("skipping closed shard %s", shard_id)
continue
stream_details["OpenShards"].append(shard)
shard["HashKeyRange"]["StartingHashKey"] = long_int(
shard["HashKeyRange"]["StartingHashKey"]
)
shard["HashKeyRange"]["EndingHashKey"] = long_int(
shard["HashKeyRange"]["EndingHashKey"]
)
if shard["HashKeyRange"]["StartingHashKey"] < min_hash_key:
min_hash_key = shard["HashKeyRange"]["StartingHashKey"]
if shard["HashKeyRange"]["EndingHashKey"] > max_hash_key:
max_hash_key = shard["HashKeyRange"]["EndingHashKey"]
stream_details["OpenShards"].sort(
key=lambda shard: long_int(shard["HashKeyRange"]["StartingHashKey"])
)
return min_hash_key, max_hash_key, stream_details
def long_int(hash_key):
"""
The hash key is a 128-bit int, sent as a string.
It's necessary to convert to int/long for comparison operations.
This helper method handles python 2/3 incompatibility
CLI Example:
.. code-block:: bash
salt myminion boto_kinesis.long_int some_MD5_hash_as_string
:return: long object if python 2.X, int object if python 3.X
"""
return int(hash_key)
def reshard(
stream_name,
desired_size,
force=False,
region=None,
key=None,
keyid=None,
profile=None,
):
"""
Reshard a kinesis stream. Each call to this function will wait until the stream is ACTIVE,
then make a single split or merge operation. This function decides where to split or merge
with the assumption that the ultimate goal is a balanced partition space.
For safety, user must past in force=True; otherwise, the function will dry run.
CLI Example:
.. code-block:: bash
salt myminion boto_kinesis.reshard my_stream N True region=us-east-1
:return: True if a split or merge was found/performed, False if nothing is needed
"""
conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
r = {}
stream_response = get_stream_when_active(stream_name, region, key, keyid, profile)
if "error" in stream_response:
return stream_response
stream_details = stream_response["result"]["StreamDescription"]
min_hash_key, max_hash_key, stream_details = get_info_for_reshard(stream_details)
log.debug(
"found %s open shards, min_hash_key %s max_hash_key %s",
len(stream_details["OpenShards"]),
min_hash_key,
max_hash_key,
)
# find the first open shard that doesn't match the desired pattern. When we find it,
# either split or merge (depending on if it's too big or too small), and then return.
for shard_num, shard in enumerate(stream_details["OpenShards"]):
shard_id = shard["ShardId"]
if "EndingSequenceNumber" in shard["SequenceNumberRange"]:
# something went wrong, there's a closed shard in our open shard list
log.debug("this should never happen! closed shard %s", shard_id)
continue
starting_hash_key = shard["HashKeyRange"]["StartingHashKey"]
ending_hash_key = shard["HashKeyRange"]["EndingHashKey"]
# this weird math matches what AWS does when you create a kinesis stream
# with an initial number of shards.
expected_starting_hash_key = (
max_hash_key - min_hash_key
) / desired_size * shard_num + shard_num
expected_ending_hash_key = (max_hash_key - min_hash_key) / desired_size * (
shard_num + 1
) + shard_num
# fix an off-by-one at the end
if expected_ending_hash_key > max_hash_key:
expected_ending_hash_key = max_hash_key
log.debug(
"Shard %s (%s) should start at %s: %s",
shard_num,
shard_id,
expected_starting_hash_key,
starting_hash_key == expected_starting_hash_key,
)
log.debug(
"Shard %s (%s) should end at %s: %s",
shard_num,
shard_id,
expected_ending_hash_key,
ending_hash_key == expected_ending_hash_key,
)
if starting_hash_key != expected_starting_hash_key:
r["error"] = "starting hash keys mismatch, don't know what to do!"
return r
if ending_hash_key == expected_ending_hash_key:
continue
if ending_hash_key > expected_ending_hash_key + 1:
# split at expected_ending_hash_key
if force:
log.debug(
"%s should end at %s, actual %s, splitting",
shard_id,
expected_ending_hash_key,
ending_hash_key,
)
r = _execute_with_retries(
conn,
"split_shard",
StreamName=stream_name,
ShardToSplit=shard_id,
NewStartingHashKey=str(expected_ending_hash_key + 1),
)
else:
log.debug(
"%s should end at %s, actual %s would split",
shard_id,
expected_ending_hash_key,
ending_hash_key,
)
if "error" not in r:
r["result"] = True
return r
else:
# merge
next_shard_id = _get_next_open_shard(stream_details, shard_id)
if not next_shard_id:
r["error"] = f"failed to find next shard after {shard_id}"
return r
if force:
log.debug(
"%s should continue past %s, merging with %s",
shard_id,
ending_hash_key,
next_shard_id,
)
r = _execute_with_retries(
conn,
"merge_shards",
StreamName=stream_name,
ShardToMerge=shard_id,
AdjacentShardToMerge=next_shard_id,
)
else:
log.debug(
"%s should continue past %s, would merge with %s",
shard_id,
ending_hash_key,
next_shard_id,
)
if "error" not in r:
r["result"] = True
return r
log.debug("No split or merge action necessary")
r["result"] = False
return r
def list_streams(region=None, key=None, keyid=None, profile=None):
"""
Return a list of all streams visible to the current account
CLI Example:
.. code-block:: bash
salt myminion boto_kinesis.list_streams
"""
conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
streams = []
exclusive_start_stream_name = ""
while exclusive_start_stream_name is not None:
args = (
{"ExclusiveStartStreamName": exclusive_start_stream_name}
if exclusive_start_stream_name
else {}
)
ret = _execute_with_retries(conn, "list_streams", **args)
if "error" in ret:
return ret
ret = ret["result"] if ret and ret.get("result") else {}
streams += ret.get("StreamNames", [])
exclusive_start_stream_name = (
streams[-1] if ret.get("HasMoreStreams", False) in (True, "true") else None
)
return {"result": streams}
def _get_next_open_shard(stream_details, shard_id):
"""
Return the next open shard after shard_id
CLI Example:
.. code-block:: bash
salt myminion boto_kinesis._get_next_open_shard existing_stream_details shard_id
"""
found = False
for shard in stream_details["OpenShards"]:
current_shard_id = shard["ShardId"]
if current_shard_id == shard_id:
found = True
continue
if found:
return current_shard_id
def _execute_with_retries(conn, function, **kwargs):
"""
Retry if we're rate limited by AWS or blocked by another call.
Give up and return error message if resource not found or argument is invalid.
conn
The connection established by the calling method via _get_conn()
function
The function to call on conn. i.e. create_stream
**kwargs
Any kwargs required by the above function, with their keywords
i.e. StreamName=stream_name
Returns:
The result dict with the HTTP response and JSON data if applicable
as 'result', or an error as 'error'
CLI Example:
.. code-block:: bash
salt myminion boto_kinesis._execute_with_retries existing_conn function_name function_kwargs
"""
r = {}
max_attempts = 18
max_retry_delay = 10
for attempt in range(max_attempts):
log.info("attempt: %s function: %s", attempt, function)
try:
fn = getattr(conn, function)
r["result"] = fn(**kwargs)
return r
except botocore.exceptions.ClientError as e:
error_code = e.response["Error"]["Code"]
if (
"LimitExceededException" in error_code
or "ResourceInUseException" in error_code
):
# could be rate limited by AWS or another command is blocking,
# retry with exponential backoff
log.debug("Retrying due to AWS exception", exc_info=True)
time.sleep(_jittered_backoff(attempt, max_retry_delay))
else:
# ResourceNotFoundException or InvalidArgumentException
r["error"] = e.response["Error"]
log.error(r["error"])
r["result"] = None
return r
r["error"] = "Tried to execute function {} {} times, but was unable".format(
function, max_attempts
)
log.error(r["error"])
return r
def _jittered_backoff(attempt, max_retry_delay):
"""
Basic exponential backoff
CLI Example:
.. code-block:: bash
salt myminion boto_kinesis._jittered_backoff current_attempt_number max_delay_in_seconds
"""
return min(random.random() * (2**attempt), max_retry_delay)