Questions tagged [offchain-worker]
Oracle-like capabilities for Substrate chains.
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Is it expected that Offchain Workers do not have access to the DispatchResultWithPostInfo return when calling extrinsics?
I have an offchain worker which does various things offline and then calls an online extrinsic.
Here's the line where I call the extrinsic from the offchain worker:
let result = signer....
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How to get on-chain data on pallet?
I want to get some 'trustful' on-chain data on the pallet, for example, get transaction data by transaction hash. I found Offchain Workers might do that job but is it really trustful because the API ...
- 347
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offchain http issue
I have integrated offchain http cal to fetch ibfo from infura as below
'''
fn fetch_block(block: &str) -> Result<BlockHeader, http::Error> {
// debug::native::debug!("INFURA: ...
- 121
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Calling CLI subcommand through different terminal after running the node
I'm trying to set some off-chain storage through a different terminal using a custom subcommand after starting up the node.
Question here is:
Is there any way to call the custom CLI subcommand in the ...
- 361
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How to ensure call was made by Offchain Worker
Feels like a very newbie question but, whilst I've found hints of how to implement this, I can't find the recommended solution.
I have an offchain worker that does some validation of remote data and ...
- 85
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To run subprocess from substrate-node ocw-context
I am trying to execute shell script which will check for some custom required process if it is not running then it will restart the process.
For that I have below snippet code(Inside fn ...
- 121
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How to get the Peer count in an Off Chain Worker?
I have an Off Chain Worker that validates some data in IPFS and then calls a function on chain to set the status to valid or invalid. That's all working fine.
However, I do not need all nodes to ...
- 85
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Accessing On-Chain Data In an Off-Chain Worker
I am looking to aggregate On-Chain data in an Off-Chain Worker, e.g. summing transaction fees included in blocks from the last 24 hrs. This is listed as one of the main use cases for Off-Chain Workers....
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When does an off-chain worker get executed?
I have a scenario where I want to execute a scheduled call via the scheduler pallet at block number n. This call will change certain storage items of pallet.
So before this storage changes, I want to ...
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How can a OCW determine if a node is fully synced?
Is there a status-call/api that a OCW could invoke in order to establish if the actual running node instance is fully synced? Maybe listening to a frame_system event? Or knowing the total blocks ...
- 582
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Is it possible to query an OCW's Off-chain storage via RPC from an external service?
I'm off-chain indexing some pallet events into my off-chain local storage using an OCW. Now, I want to be able to retrieve this data via RPC from an external service.
Is this possible? Does it require ...
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Persistent Offchain Worker Storage
Offchain workers storage comes in two flavors: Persistent and Local.
pub enum StorageKind {
/// Persistent storage is non-revertible and not fork-aware. It means that any value
/// set by the ...
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2
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50
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How to avoid multiple OCWs duplicating work?
We are running 2 OCWs each in separate instances and we have an extrinsic which mutates a storage in runtime which is done twice from the 2 OCWs but we want only one OCW to sign. How to do that?
For ...
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How to create a transaction that calls an offchain worker?
Is it possible to create a transaction that calls an offchain worker to write data to the offchain worker?
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Process ethereum transactions in an offchain worker
I need to process Ethereum transactions in a substrate offchain worker. I already include EVM and Ethereum pallets, but I also need to do some communications with runtime code running as solidity ...
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Can I call external APIs inside my pallet?
How can I call external APIs from the chain then use that data to implement further logic
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