1.5.2 集成小米FDS服务

当您在小米FDS上创建或删除了某个对象时，函数计算能够根据您创建的FDSTrigger自动检测到发生的事件，同时触发相关函数的执行。

目前函数计算同时支持新版及旧版FDS，在运行环境Python2及Python3中均可以使用。

如果您想要为上传到FDS中指定bucket的图像创建一个缩略图，可以参考如下代码：

from fds import GalaxyFDSClient,GalaxyFDSClientException,FDSClientConfiguration 
import os,sys
from PIL import Image

before_file = DOWNLOAD_IMAGE_FROM_FDS
after_file = UPLOAD_THUMBNAIL_TO_FDS

class FDSConfig:
    def __init__(self, AK, SK, ENDPOINT):
        self.AK = AK
        self.SK = SK
        self.ENDPOINT = ENDPOINT

def get_client():
    fds_config = _get_FDSConfig()
    config = FDSClientConfiguration()
    if fds_config.ENDPOINT == None:
        print "endpoint is None, please check env $XIAOMI_FDS_ENDPOINT"
        return
    config.set_endpoint(fds_config.ENDPOINT)
    return GalaxyFDSClient(fds_config.AK, fds_config.SK,config)

def _get_FDSConfig():
    AK = os.environ.get("AK")
    SK = os.environ.get("SK")
    ENDPOINT = os.environ.get("XIAOMI_FDS_ENDPOINT")
    return FDSConfig(AK, SK, ENDPOINT)

def get_image_from_fds(client,bucket):
    file = open(before_file, "w+")
    try:
        image_object = client.get_object(bucket,object)
        for chunk in image_object.stream:
            file.write(chunk)
    except GalaxyFDSClientException as e:
        print e.message
    finally:
        file.close()

def save_thumbnail():
    im = Image.open(before_file)
    size = (70,15)
    im.thumbnail(size)
    im.save(after_file,"png")
    im.close()

def put_image_to_fds(client,bucket):
    object_name = after_file.split("/")[-1]
    image = open(after_file)
    client.put_object(bucket,object_name,image)
    return object_name

def main(event):
    bucket = event['bucketName']
    object = event['objectName']
    print "start function"
    client = get_client()
    if not client.does_bucket_exist(bucket) :
        print "bucket [%s] not exist ,please create first" %bucket
        return False
    get_image_from_fds(client,bucket)
    save_thumbnail()
    after_object_name = put_image_to_fds(client,bucket)
    if client.does_object_exists(bucket, after_object_name):
        print "thunmbnail has uploaded to FDS , object is [%s]" %after_object_name
        return True
    return False

在您使用这个函数时，请参考下图设置环境变量AK，SK及XIAOMI_FDS_ENDPOINT，示例代码是通过这三个环境变量，调用FDS的sdk，完成获取及上传图片的功能，同时请修改代码中“before_file”，“after_file”这两个变量。

请注意AK/SK两个参数，如果您使用老版FDS，需要由dev.mi.com的密钥中心获取AK/SK,如果您使用新版FDS，请从用户管理中获取AK/SK event参数为dict类型，内容如下，请根据您的需求进行编码，其中action字段有两种取值：“PutObject”，“DeleteObject”：

{
     "bucketName":"test-fds",
     "objectName":"image.png",
     "action":"ACTION",
     "uuid":"3535a4ce-010b-42f2-bce9-ffb46d421aa5",
     "timestamp":1506305123069,
     "versionId":"12345"
 }