assetrealizer

This assetrealizer object contains functions for realizing files (i.e. extracting files from an asset pool and placing them into the standard file directory).

assetrealizer IDL

interface AssetRealizer {
    constructor(AssetPool pool, String destinationPath);
    Promise<unsigned long long> estimateRealizedSize(AssetList assets);
    Promise<void> realize(AssetList assets);
    Promise<Array<ValidationResult>> validateFiles(AssetList assets, AssetValidationOptions options);
};
 
interface AssetValidationOptions {
    attribute deleteCorrupt;
};
 
interface ValidationResult {
    attribute String name;
    attribute String reason;
};

Object Creation

To create an assetrealizer object, you will first need to create an assetpool instance and download files to it using an assetpoolfetcher instance. Then, load the brightsign/assetrealizer module using the require() method, and create an instance of the assetrealizer class using the assetpool instance and the destination directory for realization.

const AssetPoolClass = require("@brightsign/assetpool");
let assetPool = new AssetPoolClass("SD:/pool");
   
const AssetRealizerClass = require("@brightsign/assetrealizer");
let assetRealizer = new AssetRealizerClass(assetPool, "SD:/");

AssetRealizer

Use this interface to copy assets out of the pool into real named files in the file system and perform related functions.

estimateRealizedSize()

Promise<unsigned long long> estimateRealizedSize(AssetList assets)

Returns the estimated amount of space (in megabytes) that would be taken up if the files specified in the AssetList object are realized.

realize()

Places the files into the destination directory specified in the passed AssetList object. If the pool does not contain the full set of required files, then this method will immediately fail before any files are changed (this method attempts to do as much work as possible before destructively modifying the file system). This method automatically checks the length of the file and that any hashes that match those specified. If there is a mismatch, then the affected file is deleted from the pool and realization fails. This method may cause unprotected assets to be pruned from the pool. The method indicates failure by rejecting the returned promise.

The pool and the destination must be on the same storage device in the same file system.

validateFiles()

Checks the hash of every file in the passed AssetList against the corresponding file in the destination path and returns a string list containing each mismatched file name mapped to the reason. This operation can take a long time and slow down access to the storage device. It is normally only useful if file system or storage corruption is suspected or for debugging. The options parameter is a string list, which can currently support a single option:

"deleteCorrupt": Automatically deletes any files that do not match the expected hash. By default, these files are not deleted.

ValidationResult

This interface is returned by the validateFiles() method to indicate the results of the realize operation.

name string: The name of the mismatched file (if the realize operation fails)
reason string: An explanation for a failed realize operation. See the roAssetRealizerEvent page for a list of possible reason strings.