Questions tagged [offchain-worker]
Oracle-like capabilities for Substrate chains.
80
questions
3
votes
0
answers
26
views
Access protected API from off-chain worker
Is it possible to access a protected API from an off-chain worker, e.g. using an API Key? Hard coding the API Key would be possible, but that's obviously a security risk. Is there a safe mechanism to ...
- 189
2
votes
0
answers
84
views
How should I add offchain worker(OCW) in frontier when using AccountId20?
In order to add an offchain worker with using AccountId20 as the runtime account type I did following things.
add associated type type AuthorityId: AppCrypto<Self::Public, Self::Signature>; in ...
- 21
3
votes
1
answer
87
views
Offchain indexing storage overwrites during forks
We are using offchain indexing to store some value that will be read in offchain worker .
The keys that we are using to store data via offchain indexing is as following:
key = some_prefix + ...
- 151
0
votes
0
answers
64
views
How to execute smart contract from offchain-worker?
Would it be possible to execute smart contract call from an offchain-worker, either using ink! or pallet-contracts?
Can someone please help me to provide the solution? is there any example?
- 535
1
vote
0
answers
34
views
How to create web socket server through off chain worker?
I need to establish a web socket connection through off chain worker. I asked here How to establish web socket connection in offchain_worker but didn't get any response.
Is there any way/example to ...
- 535
1
vote
1
answer
157
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How to establish web socket connection in offchain_worker
Is there any way/example to establish web socket connection through off chain worker? There are many Rust examples but I can't use standard library.
Can someone please help me?
- 535
4
votes
1
answer
130
views
Facing issue in adding offchain worker
I'm using pow substrate chain.
I'm running 3 validators by using these commands:
For bob
./target/release/node-template \
--base-path /tmp/bob \
--chain local \
--bob \
--port 30335 \
--rpc-port 9944 \...
- 1,950
1
vote
1
answer
67
views
Iterating on a storage from Offchain Worker Concerns
I have a StorageMap named PublicKeyToMsaId which has around 300K inserted items and I want to iterate on all of those keys-values in offchain-worker to create a reverse map in offchain storage.
To ...
- 151
2
votes
1
answer
68
views
How to fetch data through api?
I want to fetch the data through an api in our chain. More specifically, I have an api which gives me the latest news. How can i implement this in our substrate chain?
can we have any doc or resources ...
- 1,950
2
votes
1
answer
44
views
How to register a custom extension for offchain workers?
I have the following code.
#[cfg(feature = "std")]
use sp_externalities::ExternalitiesExt;
#[cfg(feature = "std")]
sp_externalities::decl_extension! {
pub struct CustomExt(u32)...
- 61
1
vote
0
answers
28
views
offchain worker choose key to sign and send
I have multiple keys in my node storage with offchain worker running, there are currently 2 ways to sign and send transactions, it is done either for all of the keys stored locally, or 1 unspecified ...
- 165
0
votes
1
answer
70
views
Is runtime upgrade needed when changing offchain worker?
Suppose I have a blockchain that has been running for some time, and at a certain point, I need to update the offchain worker code. What is the recommended approach for updating the blockchain: ...
- 3
2
votes
0
answers
31
views
Are onchain storage reads cheaper from offchain worker versus from extrinsic?
Are reads from offchain workers less expensive than reads from extrinsics? I am determining how to do some large, asynchronous processing of data and determining whether the reads in this process see ...
- 556
1
vote
0
answers
106
views
Is 'Ran out of free Wasm instances' a bad symptom?
I develop a custom chain based on Substrate.
The chain business logic involves stateful sessions where the state is managed through
Http and unsigned transactions submitted via Offchain workers.
Until ...
- 181
1
vote
1
answer
77
views
How to use Offchain Workers to create HTTP POST requests with JSON-RPC body?
Too my knowledge there are no guides on how to write HTTP POST requests to a JSON-RPC API with http utilities that are available to Substrate offchain workers. What I understand currently is that the ...
