blockstore-core
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Contains various implementations of the API contract described in interface-blockstore
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# blockstore-core
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> Contains various implementations of the API contract described in interface-blockstore
# About
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Various Blockstore implementations are available.
## BaseBlockstore
Provides a complete implementation of the Blockstore interface. You must implement `.get`, `.put`, etc.
## Example
```js
import { BaseBlockstore } from 'blockstore-core'
class MyCustomBlockstore extends BaseBlockstore {
put (key, val, options) {
// store a block
}
get (key, options) {
// retrieve a block
}
// ...etc
}
```
## MemoryBlockstore
A simple Blockstore that stores blocks in memory.
## Example
```js
import { MemoryBlockstore } from 'blockstore-core'
const store = new MemoryBlockstore()
```
## BlackHoleBlockstore
A Blockstore that does not store any blocks.
## Example
```js
import { BlackHoleBlockstore } from 'blockstore-core'
const store = new BlackHoleBlockstore()
```
## TieredBlockstore
A tiered blockstore wraps one or more blockstores and will query each in parallel to retrieve a block - the operation will succeed if any wrapped store has the block.
Writes are invoked on all wrapped blockstores.
## Example
```js
import { TieredBlockstore } from 'blockstore-core'
const store = new TieredBlockstore([
store1,
store2,
// ...etc
])
```
## IdentityBlockstore
An identity blockstore is one that deals exclusively in Identity CIDs - this is a special CID with the codec [0x00](https://github.com/multiformats/multicodec/blob/d06fc6194710e8909bac64273c43f16b56ca4c34/table.csv#L2) where the multihash digest is the data that makes up the block.
## Example
```TypeScript
import { IdentityBlockstore } from 'blockstore-core'
import { CID } from 'multiformats/cid'
const blockstore = new IdentityBlockstore()
blockstore.has(CID.parse('QmFoo')) // false
blockstore.has(CID.parse('bafkqac3imvwgy3zao5xxe3de')) // true
```
# Install
```console
$ npm i blockstore-core
```
## Browser `<script>` tag
Loading this module through a script tag will make its exports available as `BlockstoreCore` in the global namespace.
```html
<script src="https://unpkg.com/blockstore-core/dist/index.min.js"></script>
```
# API Docs
- <https://ipfs.github.io/js-stores/modules/blockstore-core.html>
# License
Licensed under either of
- Apache 2.0, ([LICENSE-APACHE](https://github.com/ipfs/js-stores/blob/main/packages/blockstore-core/LICENSE-APACHE) / <http://www.apache.org/licenses/LICENSE-2.0>)
- MIT ([LICENSE-MIT](https://github.com/ipfs/js-stores/blob/main/packages/blockstore-core/LICENSE-MIT) / <http://opensource.org/licenses/MIT>)
# Contribute
Contributions welcome! Please check out [the issues](https://github.com/ipfs/js-stores/issues).
Also see our [contributing document](https://github.com/ipfs/community/blob/master/CONTRIBUTING_JS.md) for more information on how we work, and about contributing in general.
Please be aware that all interactions related to this repo are subject to the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
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