@windingtree/off-chain-adapter-swarm
v5.0.0
Published
Swarm-based storage that can be used as an off-chain data adapter in @windingtree/wt-js-libs
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Winding Tree Off Chain Data Adapter - Ethereum Swarm
Swarm-based storage that can be used in Winding Tree wt-js-libs.
Installation
npm install @windingtree/off-chain-adapter-swarm
# or
git clone https://github.com/windingtree/off-chain-adapter-swarm
nvm install
npm install
Usage
import { WtJsLibs } from '@windingtree/wt-js-libs';
import SwarmAdapter from '@windingtree/off-chain-adapter-swarm';
const libs = WtJsLibs.createInstance({
onChainDataOptions: {
provider: 'http://localhost:8545',
},
offChainDataOptions: {
adapters: {
'bzz-raw': {
options: {
swarmProviderUrl: 'http://localhost:8500',
},
create: (options) => {
return new SwarmAdapter(options);
},
},
},
},
});
Optionally, you can provide a caching backend for the adapter to avoid repeated requests. (Note: in this example, cache expiration is not specified as bzz-raw resources are immutable.)
import bluebird from 'bluebird';
import redis from 'redis';
bluebird.promisifyAll(redis.RedisClient.prototype);
const redisClient = redis.createClient();
const libs = WtJsLibs.createInstance({
onChainDataOptions: {
provider: 'http://localhost:8545',
},
offChainDataOptions: {
adapters: {
'bzz-raw': {
options: {
swarmProviderUrl: 'http://localhost:8500',
cache: {
set: (hash, dataJson) => redisClient.setAsync(hash, dataJson);
get: (hash) => redisClient.getAsync(hash);
}
}
create: (options) => {
return new SwarmAdapter(options);
},
},
},
},
});
You can also optionally specify a timeout in milliseconds for communication with Swarm gateway:
import { WtJsLibs } from '@windingtree/wt-js-libs';
import SwarmAdapter from '@windingtree/off-chain-adapter-swarm';
const libs = WtJsLibs.createInstance({
onChainDataOptions: {
provider: 'http://localhost:8545',
},
offChainDataOptions: {
adapters: {
'bzz-raw': {
options: {
swarmProviderUrl: 'http://localhost:8500',
timeout: 2000,
}
create: (options) => {
return new SwarmAdapter(options);
},
},
},
},
});