ks3sdk 1.0.8

Kingsoft Standard Storage Service SDK

# KS3 SDK for python使用指南
---

## 开发前准备
### 安装依赖模块

pip install six


### 安装python sdk
#### 在线安装

pip install ks3sdk

#### 本地安装
1、通过git下载SDK到本地

git clone https://github.com/ks3sdk/ks3-python-sdk.git


2、进入ks3-python-sdk目录

cd ks3-python-sdk

3、安装SDK

python setup.py install

### 初始化connection

from ks3.connection import Connection
ak = 'YOUR_ACCESS_KEY'
sk = 'YOUR_SECRET_KEY'
c = Connection(ak, sk, host='YOUR_REGION_ENDPOINT', is_secure=False, domain_mode=False)

*常用参数说明*

+ ak：金山云提供的ACCESS KEY ID
+ sk：金山云提供的SECRET KEY ID
+ host：金山云提供的各个Region的域名（例 ks3-cn-beijing.ksyun.com）,具体定义可参考 [API接口文档-Region(区域)](https://docs.ksyun.com/read/latest/65/_book/index.html)
+ is_secure：是否通过HTTPS协议访问Ks3，True:启用 False:关闭
+ domain_mode：是否使用自定义域名访问Ks3（host填写自定义域名），True:是 False:否

### 运行环境
适用于2.6、2.7的Python版本

## SDK介绍及使用
### 资源管理操作
* [List Buckets](#list-buckets) 列出客户所有的Bucket信息
* [Create Bucket](#create-bucket) 创建一个新的Bucket
* [Delete Bucket](#delete-bucket) 删除指定Bucket
* [Get Bucket ACL](#get-bucket-acl) 获取Bucket的ACL
* [Put Bucket ACL](#put-bucket-acl) 设置Bucket的ACL
* [Head Object](#head-object) 获取Object元信息
* [Get Object](#get-object) 下载Object数据
* [Put Object](#put-object) 上传Object数据
* [Put Object Copy](#put-object-copy) 复制Object数据
* [Delete Object](#delete-object) 删除Object数据
* [List Objects](#list-objects) 列举Bucket内的Object
* [Get Object ACL](#get-object-acl) 获得Bucket的acl
* [Put Object ACL](#put-object-acl) 上传object的acl
* [Upload Part](#upload-part) 上传分块
* [Generate URL](#generate-url) 生成下载外链

### Service操作

#### List Buckets：

*列出客户所有的 Bucket 信息*

buckets = c.get_all_buckets()
for b in buckets:
print b.name

### Bucket操作

#### Create Bucket：

*创建一个新的Bucket*

在建立了连接后，可以创建一个bucket。bucket在s3中是一个用于储存key/value的容器。用户可以将所有的数据存储在一个bucket里，也可以为不同种类数据创建相应的bucket。

bucket_name = "YOUR_BUCKET_NAME"
b = c.create_bucket(bucket_name)

注：这里如果出现409 conflict错误，说明请求的bucket name有冲突，因为bucket name是全局唯一的

#### Delete Bucket:

*删除指定Bucket*

删除一个bucket可以通过delete_bucket方法实现。

c.delete_bucket(bucket_name)

如果bucket下面存在key，那么需要首先删除所有key

b = c.get_bucket(bucket_name)
for k in b.list():
k.delete()
c.delete_bucket(bucket_name)

#### Get Bucket ACL:

*获取Bucket的ACL*

acp = b.get_acl()
>>> acp
<Policy: MTM1OTk4ODE= (owner) = FULL_CONTROL>
>>> acp.acl
<ks3.acl.ACL object at 0x23cf750>
>>> acp.acl.grants
[<ks3.acl.Grant object at 0xf63810>]
>>> for grant in acp.acl.grants:
... print grant.permission, grant.display_name, grant.email_address, grant.id
...

#### Put Bucket ACL:

*设置Bucket的ACL*

#设置bucket的权限, private or public-read or public-read-write
b.set_acl("public-read")

### Object操作

#### Head Object:
*获取Object元信息*

获取Object元数据信息（大小、最后更新时间等）

from ks3.connection import Connection

bucket_name = "YOUR_BUCKET_NAME"
key_name = "YOUR_KEY_NAME"
b = c.get_bucket(bucket_name)
try:
k = b.get_key(key_name)
if k:
print k.name, k.size, k.last_modified
#print k.__dict__
except:
pass # 异常处理

#### Get Object：
*下载该Object数据*

下载object，并且作为字符串返回

from ks3.connection import Connection

bucket_name = "YOUR_BUCKET_NAME"
key_name = "YOUR_KEY_NAME"
b = c.get_bucket(bucket_name)
try:
k = b.get_key(key_name)
s = k.get_contents_as_string()
print s
except:
pass # 异常处理

下载object，并且保存到文件中

#保存到文件
k.get_contents_to_filename("/tmp/KS3SDK_download_test")
#保存到文件句柄
f=open("/tmp/test_file","rb")
k.set_contents_from_file(f)

#### Put Object
*上传Object数据*

将指定目录的文件上传，同时可以指定文件ACL

bucket_name = "YOUR_BUCKET_NAME"
key_name = "YOUR_KEY_NAME"
try:
b = c.get_bucket(bucket_name)
k = b.new_key(key_name)
#object policy : 'private' or 'public-read'
ret=k.set_contents_from_filename("/root/KS3SDK_upload_test", policy="private")
if ret and ret.status == 200:
print "上传成功"
except:
pass #异常处理

将字符串所谓value上传

k.set_contents_from_string('This is a test of S3')

#### Put Object Copy
*复制Object数据*

将指定Bucket下的文件复制到本Bucket下（需要对源Bucket下的文件具有读权限）

bucket_name = "YOUR_DST_BUCKET_NAME"
key_name = "YOUR_DST_KEY_NAME"
try:
b = c.get_bucket(bucket_name)
b.copy_key(key_name,"YOUR_SRC_BUCKET_NAME","YOUR_SRC_KEY_NAME")
except:
pass #异常处理

#### Delete Object
*删除Object数据*

try:
b=conn.get_bucket(YOUR_BUCKET_NAME)
b.delete_key(YOUR_KEY_NAME)
except:
pass #异常处理

#### List Objects
*列举Bucket内的文件或者目录*

from ks3.prefix import Prefix
from ks3.key import Key

b = c.get_bucket(bucket_name)
keys = b.list(delimiter='/')
for k in keys:
if isinstance(k,Key):
print 'file:%s' % k.name
elif isinstance(k,Prefix):
print 'dir:%s' % k.name

*列举Bucket内指定前缀的文件*

keys = b.list(prefix="PREFIX")

#### Get Object ACL
*获得Object的acl*

b = c.get_bucket(bucket_name)
policy = b.get_acl(key_name)
print policy.to_xml()

#### Put Object ACL

#object policy : 'private' or 'public-read'
b.set_acl("public-read", test_key)

#### Upload Part：
*分块上传*

如果你想上传一个大文件，你可以将它分成几个小份，逐个上传，s3会按照顺序把它们合成一个最终的object。整个过程需要几步来完成，下面的demo程序是通过python的FileChunkIO模块来实现的。所以可能需要首先运行pip install FileChunkIO来安装。

>>> import math, os
>>> from ks3.connection import Connection
>>> from filechunkio import FileChunkIO

# Connect to S3
>>> bucket_name = "YOUR_BUCKET_NAME"
>>> c = Connection(ak, sk)
>>> b = c.get_bucket(bucket_name)

# Get file info
>>> source_path = 'path/to/your/file.ext'
>>> source_size = os.stat(source_path).st_size

# Create a multipart upload request
>>> mp = b.initiate_multipart_upload(os.path.basename(source_path))

# Use a chunk size of 50 MiB (feel free to change this)
>>> chunk_size = 52428800
>>> chunk_count = int(math.ceil(source_size / chunk_size))

# Send the file parts, using FileChunkIO to create a file-like object
# that points to a certain byte range within the original file. We
# set bytes to never exceed the original file size.
>>> for i in range(chunk_count + 1):
>>> offset = chunk_size * i
>>> bytes = min(chunk_size, source_size - offset)
>>> with FileChunkIO(source_path, 'r', offset=offset,
bytes=bytes) as fp:
>>> mp.upload_part_from_file(fp, part_num=i + 1)

# Finish the upload
>>> mp.complete_upload()

*获取已上传分块列表*

bucket = conn.get_bucket(bucket_name)
for p in bucket.list_multipart_uploads():
print 'uploadId:%s,key:%s' % (p.id, p.key_name)
for i in p:
print i.part_number, i.size, i.etag, i.last_modified

#### Generate URL
*生成下载外链地址*

对私密属性的文件生成下载外链（该链接具有时效性）

b = conn.get_bucket(bucket_name)
k = b.get_key(obj_key)
if k:
url = k.generate_url(60) # 60s 后该链接过期
print url

指定时间过期

k.generate_url(1492073594,expires_in_absolute=True) # 1492073594为Unix Time