qiniu_download

Struct RangeReader

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pub struct RangeReader(/* private fields */);
Expand description

对象范围下载器

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impl RangeReader

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pub fn builder( bucket: impl Into<String>, key: impl Into<String>, credential: Credential, io_urls: Vec<String>, ) -> RangeReaderBuilder

创建范围下载构建器

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pub fn from_config(key: impl Into<String>, config: &Config) -> Self

从配置创建范围下载器

§Arguments
  • key - 对象名称
  • config - 下载配置
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pub fn from_env(key: impl Into<String>) -> Option<Self>

从环境变量创建范围下载器

§Arguments
  • key - 对象名称
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pub fn update_urls(&self) -> bool

主动更新域名列表

如果返回为 true 表示更新成功，否则返回 false

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pub fn io_urls(&self) -> Vec<String>

获取当前可用的 IO 节点的域名

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pub fn read_multi_ranges( &self, ranges: &[(u64, u64)], ) -> IoResult<Vec<RangePart>>

读取文件的多个区域，返回每个区域对应的数据

§Arguments
  • range - 区域列表，每个区域有开始偏移量和区域长度组成
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pub fn exist(&self) -> IoResult<bool>

判定当前对象是否存在

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pub fn file_size(&self) -> IoResult<u64>

获取当前对象的文件大小

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pub fn download(&self) -> IoResult<Vec<u8>>

下载当前对象到内存缓冲区中

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pub fn download_to(&self, writer: &mut dyn WriteSeek) -> IoResult<u64>

下载当前对象到指定输出流中

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pub fn read_last_bytes(&self, buf: &mut [u8]) -> IoResult<(u64, u64)>

下载对象的最后指定个字节到缓冲区中，返回实际下载的字节数和整个文件的大小

Trait Implementations§

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impl Debug for RangeReader

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl ReadAt for RangeReader

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fn read_at(&self, pos: u64, buf: &mut [u8]) -> IoResult<usize>

Read bytes from an offset in this source into a buffer, returning how many bytes were read. Read more
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fn read_exact_at(&self, pos: u64, buf: &mut [u8]) -> Result<(), Error>

Read the exact number of bytes required to fill buf, from an offset. Read more

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fn read_u8_at(&self, pos: u64) -> Result<u8, Error>

Reads an unsigned 8-bit integer at an offset.
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fn read_i8_at(&self, pos: u64) -> Result<i8, Error>

Reads a signed 8-bit integer at an offset.
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fn read_u16_at<T>(&self, pos: u64) -> Result<u16, Error>
where T: ByteOrder,

Reads an unsigned 16-bit integer at an offset.
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fn read_i16_at<T>(&self, pos: u64) -> Result<i16, Error>
where T: ByteOrder,

Reads a signed 16-bit integer at an offset.
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fn read_u32_at<T>(&self, pos: u64) -> Result<u32, Error>
where T: ByteOrder,

Reads an unsigned 32-bit integer at an offset.
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fn read_i32_at<T>(&self, pos: u64) -> Result<i32, Error>
where T: ByteOrder,

Reads a signed 32-bit integer at an offset.
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fn read_u64_at<T>(&self, pos: u64) -> Result<u64, Error>
where T: ByteOrder,

Reads an unsigned 64-bit integer at an offset.
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fn read_i64_at<T>(&self, pos: u64) -> Result<i64, Error>
where T: ByteOrder,

Reads a signed 64-bit integer at an offset.
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fn read_uint_at<T>(&self, pos: u64, nbytes: usize) -> Result<u64, Error>
where T: ByteOrder,

Reads an unsigned nbytes-bit integer at an offset.
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fn read_int_at<T>(&self, pos: u64, nbytes: usize) -> Result<i64, Error>
where T: ByteOrder,

Reads a signed nbytes-bit integer at an offset.
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fn read_f32_at<T>(&self, pos: u64) -> Result<f32, Error>
where T: ByteOrder,

Reads a single-precision floating point number at an offset.
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fn read_f64_at<T>(&self, pos: u64) -> Result<f64, Error>
where T: ByteOrder,

Reads a double-precision floating point number at an offset.
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