@ chunkd/ 来源
用于所有源的基础接口 @chunkd
export interface Source {
/**
* human friendly name of the source type
* @example "aws:s3", "file", "memory"
*/
type: string;
/**
* URL to the source
*
* @example "s3://linz-imagery/catalog.json" or "file:///home/blacha/18_126359_137603.webp"
*/
url: URL;
/** Metadata about the object the source represents */
metadata?: SourceMetadata;
/** Read the metadata before a fetch request */
head(): Promise<SourceMetadata>;
/** close the source, sources like files sometimes have open file handles that need to be closed */
close?(): Promise<void>;
/**
* Directly read bytes from the source
*
* @example
* ```typescript
* source.fetch(0, 1024) // load the first 1024 bytes
* source.fetch(1024, 20) // read 20 bytes at offset 1024
* source.fetch(-1024) // load the last 1024 bytes
*```
* @param offset Byte to start reading form
* @param length optional number of bytes to read
*/
fetch(offset: number, length?: number): Promise<ArrayBuffer>;
}
实例
示例来源