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@dsnp/frequency-schemas
Advanced tools
Matching DSNP Version: v1.3.0
npm install @dsnp/frequency-schemas
import { dsnp } from "@dsnp/frequency-schemas";
console.log(dsnp.getSchema("broadcast"));
import { dsnp } from "@dsnp/frequency-schemas";
import { ApiPromise } from "@polkadot/api";
const api = ApiPromise.create(/* ... */);
console.log(dsnp.getSchemaId("broadcast", "1.3", api.genesisHash.toString()));
The API connection is used only to identify the chain by its genesis hash.
Frequency chains have well-known Ids defined in dsnp/index.ts
.
However, it is possible to configure a custom mapping if needed:
dsnp.setSchemaMapping(api.genesisHash.toString(), {
// format is dsnpName: { version: schemaId, ... }
"tombstone": { "1.2": 64 },
"broadcast": { "1.2": 67 },
// ...
});
console.log(dsnp.getSchemaId("broadcast", "1.2", api.genesisHash.toString())); // yields 67
npm install @dsnp/parquetjs
import { parquet } from "@dsnp/frequency-schemas";
import { ParquetWriter } from "@dsnp/parquetjs";
const [parquetSchema, writerOptions] = parquet.fromFrequencySchema("broadcast");
const writer = await ParquetWriter.openFile(parquetSchema, "./file.parquet", writerOptions);
writer.appendRow({
announcementType: 2,
contentHash: "0x1234567890abcdef0123456789abcdef0123456789abcdef0123456789abcdef",
fromId: 78187493520,
url: "https://spec.dsnp.org/DSNP/Types/Broadcast.html",
});
await writer.close();
npm install
e.g. To register the "profile-resources" schema
npm run deploy profile-resources
by default it will deploy to the localhost
node on port 9944 using the Alice sudo test account.
Two environment variables allow you to change these defaults:
DEPLOY_SCHEMA_ACCOUNT_URI="//Alice"
DEPLOY_SCHEMA_ENDPOINT_URL="ws://localhost:9944"
e.g.
DEPLOY_SCHEMA_ACCOUNT_URI="//Bob" DEPLOY_SCHEMA_ENDPOINT_URL="ws://127.0.0.1:9944" npm run deploy profile-resources
Note: Requires a sudo key if deploying to a testnet.
Mainnet will use the proposal system (proposeToCreateSchema
).
npm run deploy help
DEPLOY_SCHEMA_ENDPOINT_URL="ws://127.0.0.1:9944" npm run read
Will output various information about the schemas on the chain as well as attempt to match known DSNP schemas.
## Connection Information
┌─────────┬─────────────────────┬────────────────────────────────────────────┐
│ (index) │ key │ value │
├─────────┼─────────────────────┼────────────────────────────────────────────┤
│ 0 │ 'endpointUrl' │ 'wss://frequency-seal.liberti.social:9944' │
│ 1 │ 'clientVersion' │ '0.1.0-377bbe37fbe' │
│ 2 │ 'specName' │ 'frequency' │
│ 3 │ 'specVersion' │ '1' │
│ 4 │ 'latestBlockNumber' │ '16' │
└─────────┴─────────────────────┴────────────────────────────────────────────┘
## Schema Information
There are 8 schemas on the connected chain.
## Schema Id 1
┌─────────┬──────────────────────┬───────────────────────────────┐
│ (index) │ key │ value │
├─────────┼──────────────────────┼───────────────────────────────┤
│ 0 │ 'schema_id' │ '1' │
│ 1 │ 'model_type' │ 'Parquet' │
│ 2 │ 'payload_location' │ 'IPFS' │
│ 3 │ 'matchesDSNPSchemas' │ 'dsnp.broadcast' │
└─────────┴──────────────────────┴───────────────────────────────┘
## Schema Model
[
{
"name": "announcementType",
"column_type": {"INTEGER": {"bit_width": 32, "sign": true}},
"compression": "GZIP",
"bloom_filter": false
},
{
"name": "contentHash",
"column_type": "BYTE_ARRAY",
"compression": "GZIP",
"bloom_filter": true
},
{
"name": "fromId",
"column_type": {"INTEGER": {"bit_width": 64, "sign": false}},
"compression": "GZIP",
"bloom_filter": true
},
{
"name": "url",
"column_type": "STRING",
"compression": "GZIP",
"bloom_filter": false
}
]
...
This script will look up and verify schemas in the schema registry that match the DSNP names and versions defined in dsnp/index.ts
.
DEPLOY_SCHEMA_ENDPOINT_URL="ws://127.0.0.1:9944" npm run find
FAQs
Schemas for DSNP on Frequency
The npm package @dsnp/frequency-schemas receives a total of 6 weekly downloads. As such, @dsnp/frequency-schemas popularity was classified as not popular.
We found that @dsnp/frequency-schemas demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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