Quick summary of features/subsystems.
http,UDP replacment).open and do.npm install -g node-gypnpm install -g windows-build-tools - if these are not initially installed, it will require a system restart, without any visible notice; but the install will not complete until restarted.npm install -g cmake-js and cmake.ODBC connectivity is provided as an alternative to the sqlite interface, providing connectivity with all existing databases. It is not required; Sqlite itself is not 'required' but special steps have to be taken to disable it. When enabled, the SACK library uses it to configure some runtime options. Options may be controlled by an 'interface.conf' configuration file.
const sack = require( 'sack.vfs' );
import {SACK} from "sack.vfs";
{
ComPort(comport) - access to com ports.
JSOX - A jsox parser. (JSON5/6 input compatible)
parse(string) - result with a V8 object created from the json string.
stringify(obj [,stringifer [,formatter])
begin( cb ) - begin parsing JSOX stream; callback is called as each value is completed.
stringifier() - create a reusable stringifier which can be used for custom types
JSON6 - A json6 parser. (JSON5 input compatible)
parse(string [,reviver]) - result with a V8 object created from the json string.
begin( cb ) - begin parsing JSON6 stream; callback is called as each value is completed.
stringify(obj [,stringifer [,formatter])
JSON - A json parser.
parse(string) - result with a V8 object created from the json string.
begin( cb ) - begin parsing JSON stream; callback is called as each value is completed.
Sqlite(dbName) - an interface to sqlite which can open databases in the volume.
parameters - ( databaseName )
databaseName maybe a simple ODBC name; if the name ends with .db, it is assumed to be
a sqlite database. If ODBC is not available, it may be assumed that the name will
just be a sqlite database name. Extra syntax - if the name starts with a $, then the
next word after $ and before the next @ or $ is used to select a sqlite vfs name.
( https://sqlite.org/vfs.html )
if the name is 'sack' then after @ and before the next $ is specified a mounted filesystem name.
Sqlite has methods available on it to access native program options.
Sqlite.op( opName, defaultValue ) - read/write default option database option.
Sqlite.so( opName, newValue ) - write new value to default option database.
ObjectStorage( fileName [, version] ) - open a JS object storage database.
Volume([mountName,]fileName[,version]) - a virtual disk partition that holds files.
mountName - the mount name used to mount to volume as a filesystem; it may be referenced
later in the string passed to Sqlite. It may be `null` if it is anonymous mount.
if no parameters are passed, a Volume object representing the native filesystem is returned.
Volume.mkdir(pathname) - utility function to make directories which might not exist before volume does;
(Volume() auto creates directories now if specified path to filename does not exist)
parameters - (pathname)
path to create- will created missing parent path parts too.
Volume.readAsString( filename ) - memory map map a file from native filesystem as a utf8 string.
Volume.mapFile( filename, loaded_callback ) - memory map map a file from native filesystem as an arrayBuffer.
if loaded callback is specified, a thread is created that touches every page in the file, when it's done
the callback is called with no parameters.
File - some native filsystem utility methods(?)
FileMonitor - receive event notifications when files change
SaltyRNG(feed salt callback) - creates a random number generator
TLS - namespace for utilities to generate certificates/keys
genkey( length [,password]) - Generates a keypair
pubkey( {options} ) - gets public key of a keypair or certificate
gencert( { options } ) - Generates a self signed certificate.
genreq( {options} ) - Generates a certification request
signcert( {options} ) - uses a certificate to sign a certificate request
validate( {options} ) - validate a certificate against a certificate chain.
expiration( certificate ) - gets the expiration of a certificate as a Date().
WebSocket - Websocket interface
Client( ... ) - create a websocket client
Server( ... ) - create a websocket server
Thread - Helper functions to transport accepted clients to other threads.
post( accepted_socket, unique_destination_string ) - posts a socket to another thread
accept( unique_destination_string, ( newSocket )=>{} ) - receives posted accepted sockets
HTTP - HTTP Request Method
get( {options} ) - synchronous http request
HTTPS - HTTPS Request Method
get( {options} ) - synchronous https request
Network - Raw network utilities
Address( address [,port] ) - holder for network addresses.
UDP( ... ) - UDP Socket to send/received datagrams.
Config - Process configuration files; also streaming text parsing
(methods)[#Config_Methods]
ComPort - (see below)
System - Namespace for SACK system interface routines (The above methods should be moved into this namespace)
createMemory(name,byte size) - creates a named memory region; memory regions by name are shared on the system.
openMemory(name) - opens an existing names region; returns an ArrayBuffer which can be mapped to a typed array by application.
enableThreadFileSystem() - enables mounting file systems specifically for this thread
allowSpawn() - returns task allowed state
disallowSpawn() - disble task spawns for this thread
dumpRegisteredNames() - dumps internal procedure/interface registry
reboot() - on windows, trigger a reboot.
Task(options) - an interface for createing and monitoring tasks.
Task constructor takes an option object.
end() - cause a task to exit..
write() - send something to a task.
send() - send something to a task.
terminate() - terminate created task.
// windows only
registry - an interface to windows registry options
set( path, value ) - set a new value in the registry
get( path ) - get a value from the registry.
hid - raw keyboard interface, allows identification of different physical keyboard devices.
log(string) - log a string.
memDump() - log memory stats (track module memory leaks)
mkdir() - make a directory in the current path; handles recursive directory creation.
u8xor(s,k) - utility function to apply a string mask.
b64xor(s,k) - utility function to just xor a value into a base64 string without expanding the values.
id() - generate a unique ID (256 bits, 32 bytes, 44chars, trailing '=').
Id() - generate a short unique ID (12 bytes, 16chars).
loadComplete() - Indicate to SACK system that this is completed loading (task summoner support;linux;deprecated)
/* if( isolated )... */
setTimeout(fn,delay ) - same as JS function of same name (on sack object) (returns a number ID)
setInterval(fn,delay) - same as JS function of same name (returns a number ID)
clearTimeout( timeout_id )
clearInterval( timeout_id )
}
These are available when building the GUI version.
Http/Websocket - simple script to handle basic resource requests, and provide a websocket endpoint interface. User supplies accept() and connect() callbacks. Also includes basic express-like interface addon.
PRNG - Small seedable RNGs.
Events - Small event subscription/dispatch class
dbUtil - database utilities to read schema from database; builds JS objects representing table structures which can be queried for structure.
summoner - (experimental/example) this launches and tracks other tasks.
task-manager - Runs tasks, provides a simple UI which can get the tasks' logs and control run state of tasks.
Node loader hooks for .json6 and .jsox file types.
This loader does an import of sack.vfs and sets globalThis.SACK with the result; and then also assigns
globalThis.JSOX and globalThis.JSON6.
The loader hooks are loaded with the option
--experimental-loader=node_modules/sack.vfs/import.mjs
Previously support for .json6 and .jsox were only provided for require().
Loading either JS version of JSON6 or JSOX should be done after this, allowing them to replace the globalThis versions.
The sack.vfs version is still available via SACK.JSOX or SACK.JSON6.
Performance-wise the JS versions have advantages if the information to parse is sourced in JS, while the SACK versions can operate directly on the array buffers loaded from SACK databases, Volumes and files. Which limits the copy one side; otherwise there's a conversion to string from binary and a copy of that string from JS to C potentially.
Loader also supports fetching files over HTTP:// and HTTPS:// (or http:// and https://). This performs a request, and then sends the result as the loaded module.
As a further feature, since web files often just use .js as the extension for modules, and everything loaded from a type="module" script is loaded as a module,
the loader supports loading from module://./ (the '.' is important, since really the host is always this computer, and becomes part of the requests when a module loads another module).
The module://./ prefix is substituted, and uses environment variables RESOURCE_PATH for where to load default files, if the file path starts with /common then COMMON_PATH environment
variable is prepended to the file, and /node_modules file prefix uses NODE_MODULE_PATH environment variable to load modules; native modules will probably not load this way, but typical
javascript modules can be loaded this way.
There is a race condition, if http(s):// is used from the local server, then the loading might stall waiting for the server to become available; this is the reason
that module:// support was added. TODO: Fix stall, workaround, use module:// instead of http(s):// for local files loaded from a self contained server.
FAQs
SACK abstraction library exposed to JS to provide low level system services.
The npm package sack.vfs receives a total of 266 weekly downloads. As such, sack.vfs popularity was classified as not popular.
We found that sack.vfs demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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