@carimus/node-disks
v1.12.0
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An abstraction for local/remote disks for node inspired by The League of Extraordinary Packages's FlySystem.
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Node Disks
An abstraction for local/remote disks for node inspired by The League of Extraordinary Packages's FlySystem.
Prerequisites
- Node >= 10
Getting Started
Install the package in your project:
yarn add @carimus/node-disks
Or if you're using npm
:
npm install --save @carimus/node-disks
Usage
There's two way to utilize the abstract disk implementations that this library supports.
Option A: Use Disks Directly
You can create new instances of any of the exported *Disk
classes directly and use their
available Disk
methods to perform operations.
For example (in typescript):
import { Disk, LocalDisk, S3Disk, pipeStreams } from '@carimus/node-disks';
const foo: Disk = new LocalDisk({ root: '/tmp' });
const bar: Disk = new S3Disk({ bucket: 'test' });
// Wrap everything in a self-executing async function.
(async () => {
// Write a file to the foo disk
await foo.write('foo.txt', 'This is a foo file');
// Log out the contents of foo.txt
console.log(await foo.read('foo.txt'));
// Stream the file from the foo disk to the bar disk as bar.txt
const fooReadStream = await foo.createReadStream('foo.txt');
const barWriteStream = await bar.createWriteStream('bar.txt');
await pipeStreams(fooReadStream, barWriteStream);
// Get a listing of the bar disk contents and store it on the foo disk.
const s3Listing = await bar.list();
await foo.write('s3listing.json', JSON.stringify(s3Listing, null, 2));
// Delete the files we created
await foo.delete('foo.txt');
await foo.delete('s3listing.json');
await bar.delete('bar.txt');
})();
Option B: Use a Disk Manager
node-disks
also ships with a DiskManager
that you can provide a single, declarative
configuration up front and then load disks by name from that config.
For example, considering the two disks in Option A below, we could have instead done:
import { DiskManager, Disk, DiskDriver } from '@carimus/node-disks';
const diskManager = new DiskManager({
// `default` MUST be an alias to another disk. All other keys can be aliases (strings) or objects.
default: 'foo',
foo: {
driver: DiskDriver.Local,
config: {
root: '/tmp',
},
},
bar: {
driver: DiskDriver.S3,
config: {
bucket: 'test',
},
},
baz: 'bar', // Alias the baz disk name to the bar S3 disk.
});
const foo: Disk = diskManager.getDisk('foo');
const bar: Disk = diskManager.getDisk('bar');
// Use `foo` and `bar` not worrying about their implementation like in Option A.
Supported Drivers and Options
Common
All drivers inherit from and implement the abstract Disk
class and as such inherit some
default base functionality and options.
Common Disk Options
| Name | Type | Description |
| ---------------------- | ------- | ---------------------------------------------------------------------------------------------------------- |
| url
| string | Optional; If the disk supports URLs, this is the base URL to prepend to paths |
| temporaryUrlExpires
| number | Optional; If the disk supports temp URLs, how many seconds after generation do they expire? Default 1 day. |
| temporaryUrlFallback
| boolean | Optional; If the disk supports URLs but not temp URLs, should it by default fallback to permanent URLs? |
Memory
Driver name: 'memory'
(DiskDriver.Memory
)
Disk
class: MemoryDisk
DiskConfig
interface: DiskConfig
(no extra config outside of common DiskConfig
)
An in-memory disk whose contents will be forgotten when the node process ends. Each instance of the MemoryDisk
has
its own isolated filesystem.
Memory Disk Options
Takes no options.
Local
Driver name: 'local'
(DiskDriver.Local
)
Disk
class: LocalDisk
DiskConfig
interface: LocalDiskConfig
A disk that uses the local filesystem.
Local Disk Options
| Name | Type | Description |
| ------ | ------ | --------------------------------------------------------------------------------------------------- |
| root
| string | Required; The absolute path to thee directory where files should be stored on the local filesystem. |
S3
Driver name: 's3'
(DiskDriver.S3
)
Disk
class: S3Disk
DiskConfig
interface: S3DiskConfig
A disk that uses a remote AWS S3 bucket.
S3 Disk Options
| Name | Type | Description |
| ----------------- | ------ | ------------------------------------------------------------------------------------------------------------------------- |
| bucket
| string | Required; The S3 bucket to use. |
| root
| string | Optional; The prefix to use for storing objects in the bucket. Defaults to the root |
| pagingLimit
| number | Optional; Num of max results to fetch when paging through an S3 listObjectsV2
call. Defaults to 1000
, the max. |
| expires
| number | Optional; Number of seconds from time of upload to set Expires
and Cache-Control
for putObject
calls. |
| putParams
| object | Optional; Additional params to merge into all putObject
calls |
| clientConfig
| object | Optional; Options to pass to the AWS.S3
client constructor. Can be used to pass credentials if not using env variables. |
| autoContentType
| bool | Optional; Use the mime
library to guess ContentType
for write operations. Defaults to true
|
API
Disk
Abstract Class
Methods
async read(path: string): Promise<Buffer>
to read a file into memoryasync createReadStream(path: string): Promise<Readable>
to obtain a readable stream to a fileasync write(path: string, contents: Buffer): Promise<void>
to write to a fileasync createReadStream(path: string): Promise<Writable>
to obtain a writable stream to a fileasync delete(path: string): Promise<void>
to delete a file (not a directory)async list(path: string): Promise<DiskListingObject[]>
to obtain a list of objects in a directory on the disk.getName(): string | null
to get the name of the disk if it was created with one. TheDiskManager
will automatically and appropriately set this to the actual resolved name of the disk from the config.getUrl(path: string): string | null
to get a URL to an object if the disk supports it and is configured appropriately. If the disk doesn't support URLs,null
is returned.getTemporaryUrl(path: string, expires: number, fallback: boolean): string | null
to get a temporary URL to an object if the disk supports it and is configured appropriately. This method by default won't fallback to generating permanent URLs but can iffallback
is explicitly passed astrue
or if the disk is configured withtemporaryUrlFallback
set totrue
. If the disk doesn't support temporary URLs and can't fallback to permanent URLs,null
is returned.isTemporaryUrlValid(temporaryUrl: string, against: number | Date = Date.now()): boolean | null
to determine if a temporary URL generated withgetTemporaryUrl
is valid (i.e. unexpired). Will returnnull
if the URL can't be determined either way or if the disk does not support temporary URLs.async withTempFile(path: string, execute: ((path: string) => Promise<void> | void) | null, extraOptions?: import('tmp').FileOptions): Promise<string>
to stream the contents of a file from the disk to a temporary file on the local filesystem for performing operations that are easier (or more performant, etc.) to do with local data on the disk as opposed to in memory (e.g.disk.read(path)
).- The caller can pass an async
execute
callback which will get a string path to the temp file that contains the disk file's contents. Onceexecute
returns/resolves, the file will be automatically deleted. If anexecute
callback is not provided, the function will resolve with the path to the temp file. IMPORTANT: it's the caller's responsibility using this approach tounlink
the file when they're done with it. - This functionality is achieved using
tmp
. You can pass any additionalFileOptions
through totmp
(i.e.prefix
) using the third parameterextraOptions
.
- The caller can pass an async
MemoryDisk
Class (extends Disk
)
Methods
constructor(config: MemoryDiskConfig, name?: string)
to create the disk.- See Memory Disk Options above for a list of config options you can pass to this disk.
LocalDisk
Class (extends Disk
)
Methods
constructor(config: LocalDiskConfig, name?: string)
to create the disk.- See
LocalDiskConfig
Options above for a list of config options you can pass to this disk.
- See
S3Disk
Class (extends Disk
)
Methods
constructor(config: S3DiskConfig, name?: string, s3Client?: AWS.S3)
to create the disk, optionally taking a pre-initialized S3 client instead of creating a new one.- See
S3DiskConfig
Options above for a list of config options you can pass to this disk.
- See
DiskManager
Class
Methods
constructor(config: DiskManagerConfig)
create the disk manager with a map of disk names to their specification object containing at least adriver
property and then additionally aconfig
property containing whatever required config options that specific driver needs. Or a string, which is treated as an alias for another disk in theDiskManagerConfig
async getDisk(name: string, options: GetDiskOptions): Disk
to get a disk by name. Some disks require runtime options that aren't optimal to pass through config. Those are provided in the second argument here.
DiskListingObject
Interface
Properties
name
: the name of the file or directorytype
: the type (file or directory), seeDiskObjectType
DiskObjectType
Enum
Values
Indicates the type of an object on the disk.
DiskObjectType.File
: a fileDiskObjectType.Directory
: a directory
Utils
This library also exports some helper methods:
async pipeStreams(readable: Readable, writable: Writable): Promise<string>
pipes a readable stream into a writable stream and waits until it completes. It will reject if the pipe stream emits an error and will otherwise resolve with the name of the event that the stream closed with (i.e.'close'
or'finish'
).async streamToBuffer(stream: Readable): Promise<Buffer>
pipes a readable stream into a single buffer. Rejects if the stream emits an error.
TODO
- [ ] Make the
MemoryDisk
test generic to run on anyDisk
and figure out how to run it safely withLocalDisk
andS3Disk
:S3Disk
: credentials and bucket from environment with cleanupafterEach
and don't fail if env variables aren't there.LocalDisk
: just randomly generate a path to a tmp directory that doesn't exist inbeforeEach
and use that as the disk root and rimraf it inafterEach
- [ ] Improve tests to cover niche cases like:
Readable
stream passed toMemoryDisk
/LocalDisk
- Properly handled symlinks in directory listings for
MemoryDisk
/LocalDisk
- Proper errors from bad permissions for
MemoryDisk
/LocalDisk
- Multiple writes to the same file do truncate
- Listings always include directories first
- [ ] Wrap all unknown errors in an
UnknownDiskError
(maybe usingVError
?) - [ ] Ensure that when memfs is used, we always use the posix path module even on a win32 host FS (or otherwise verify that on win32, memfs uses win32 paths).
- [ ] Proxy read and write streams so that errors emitted on streams can be wrapped
- [ ] Upgrade
CodedError
to also contain a reference to the original system/driver error - [ ] LocalDisk config setting to filter directory listings by only accessible files/directories.
- [ ] Support additional basic filesystem operations:
- [ ] Copy
- [ ] Move
- [ ] Delete many (globs??)
- [ ] Delete directories (
rimraf
) - [ ] Support
force
delete option for not failing when file isn't found and does rimraf for directories.
Development
This project is based on the carimus-node-ts-package-template
. Check out the
README and docs there
for more up to date information on the development process and tools available.