/// <reference types="node" />
import FetchResult from '../common/models/FetchResult';
/**
 * Class that implements the IPFS Storage functionality.
 */
export default class IpfsStorage {
    /**  IPFS node instance  */
    private node;
    /**  IPFS Storage class object  */
    static ipfsStorageInstance: IpfsStorage;
    /**
     * Static method to have a single instance of class and mock in unit tests
     */
    static create(repo?: any): IpfsStorage;
    private constructor();
    /**
     * Reads the stored content of the content identifier.
     * @param hash Content identifier to fetch the content.
     * @param maxSizeInBytes The maximum allowed size limit of the content.
     * @returns The fetch result containg the content buffer if found.
     *          The result `code` is set to `FetchResultCode.NotFound` if the content is not found.
     *          The result `code` is set to `FetchResultCode.MaxSizeExceeded` if the content exceeds the specified max size.
     *          The result `code` is set to `FetchResultCode.NotAFile` if the content being downloaded is not a file (e.g. a directory).
     */
    read(hash: string, maxSizeInBytes: number): Promise<FetchResult>;
    /**
     * Fetch the content from IPFS.
     * This method also allows easy mocking in tests.
     */
    private fetchContent;
    /**
     * Writes the passed content to the IPFS storage.
     * @param content Sidetree content to write to IPFS storage.
     * @returns The multihash content identifier of the stored content.
     */
    write(content: Buffer): Promise<string>;
    /**
     * Stops this IPFS store.
     */
    stop(): void;
}