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::

        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