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from 'smoldot';\n\n// Load a string chain specification.\nconst chainSpec = fs.readFileSync('./westend.json', 'utf8');\n\n// A single client can be used to initialize multiple chains.\nconst client = smoldot.start();\n\nconst chain = await client.addChain({ chainSpec });\n\nchain.sendJsonRpc('{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"system_name\",\"params\":[]}');\n\n// Wait for a JSON-RPC response to come back. This is typically done in a loop in the background.\nconst jsonRpcResponse = await chain.nextJsonRpcResponse();\nconsole.log(jsonRpcResponse)\n\n// Later:\n// chain.remove();\n```\n\n## Usage\n\nThe first thing to do is to initialize the client with the `start` function.\n\nOnce initialized, the client can be used to connect to one or more chains. Use `addChain` to add\na new chain that the client must be connected to. `addChain` must be passed the specification of\nthe chain (commonly known as \"chain spec\").\n\nThe `addChain` function returns a `Promise` that yields a chain once the chain specification has\nbeen successfully parsed and basic initialization is finished, but before Internet connections\nare opened towards the chains.\n\nIn order to de-initialize a chain, call `chain.remove()`. Any function called afterwards on this\nchain will throw an exception.\nIn order to de-initialize a client, call `client.terminate()`. Any function called afterwards on\nany of the chains of the client will throw an exception.\n\nAfter having obtained a chain, use `sendJsonRpc` to send a JSON-RPC request towards the node.\nThe function accepts as parameter a string request. See\n[the specification of the JSON-RPC protocol](https://www.jsonrpc.org/specification),\nand [the list of requests that smoldot is capable of serving](https://polkadot.js.org/docs/substrate/rpc/).\nSmoldot also has experimental support for an extra (still experimental at the time of writing of\nthis comment) set of JSON-RPC functions [found here](https://github.com/paritytech/json-rpc-interface-spec/).\n\nIf the request is well formatted, the client will generate a response. This response can be pulled\nusing the `nextJsonRpcResponse` asynchronous function. Calling this function waits until a response\nis available and returns it.\n\nIf the request is a subscription, the notifications will also be sent back using the same mechanism\nand can be pulled using `nextJsonRpcResponse`.\n\nIf the chain specification passed to `addChain` is a parachain, then the list of potential relay\nchains must be passed as parameter to `addChain` as well. In situations where the chain\nspecifications passed to `addChain` are not trusted, it is important for security reasons to not\nestablish a parachain-relay-chain link between two chains that aren't part of the same \"trust\nsandbox\".\n\n## Usage with a worker\n\nBy default, calling `start()` will run smoldot entirely in the current thread. This can cause\nperformance issues if other CPU-heavy operations are done in that thread.\n\nIn order to help with this, it is possible to use smoldot in conjunction with a worker.\nTo do so, you must first create a worker. Since creating a worker has some subtle differences\ndepending on the platform, this is outside of the responsibility of smoldot.\n\nOnce the worker is created, create two `MessagePort`s using `new MessageChannel`, and send one\nof them to the worker. Then, pass one port to the `ClientOptions.portToWorker` field and the\nother port to the `run()` function of smoldot, which can be imported with\n`import { run } from 'smoldot/worker';` (on Deno, it is found in `worker-deno.ts`).\n\nAnother optimization that is orthogonal to but is related to running smoldot in a worker consists\nin also loading the smoldot bytecode in that worker. The smoldot bytecode weights several\nmegabytes, and loading it in a worker rather than the main thread makes it possible to load the\nUI while smoldot is still initializing. This is especially important when smoldot is included in\nan application served over the web.\n\nIn order to load the smoldot bytecode in a worker, import `compileBytecode` with\n`import { compileBytecode } from 'smoldot/bytecode';` (on Deno: `bytecode-deno.ts`), then call the\nfunction and send the result to the main thread. From the main thread, rather than using the\n`start` function imported from `smoldot`, use the `startWithBytecode` function that can be imported\nusing `import { startWithBytecode } from 'smoldot/no-auto-bytecode';` (on Deno:\n`no-auto-bytecode-deno.ts`). The options provided to `startWithBytecode` are the same as the ones\npassed to `start`, except for an additional `bytecode` field that must be set to the bytecode\ncreated in the worker.\n\nHere is an example of all this, assuming a browser environment:\n\n```ts\nimport * as smoldot from 'smoldot/no-auto-bytecode';\n\nconst worker = new Worker(new URL('./worker.js', import.meta.url));\n\nconst bytecode = new Promise((resolve) => {\n    worker.onmessage = (event) => resolve(event.data);\n});\n\nconst { port1, port2 } = new MessageChannel();\nworker.postMessage(port1, [port1]);\n\nconst client = smoldot.startWithBytecode({\n    bytecode,\n    portToWorker: port2,\n});\n\n\n// `worker.ts`\n\nimport * as smoldot from 'smoldot/worker';\nimport { compileBytecode } from 'smoldot/bytecode';\n\ncompileBytecode().then((bytecode) => postMessage(bytecode))\nonmessage = (msg) => smoldot.run(msg.data);\n```\n\nNote that importing sub-paths (for example importing `smoldot/worker`) relies on a relatively\nmodern JavaScript feature. If you import a smoldot sub-path from a TypeScript file, you might have\nto configure TypeScript to use `\"moduleResolution\": \"node16\"`. [The official TypeScript\ndocumentation itself recommends setting this configuration option to\n`node`](https://www.typescriptlang.org/docs/handbook/module-resolution.html#module-resolution-strategies),\nand it is likely that `node16` becomes the go-to module resolution scheme in the future.\n","readmeFilename":"README.md"}