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Hello Substrate community

I've been trying to integrate an offchain worker capable of API calls on top of an existing Substrate cluster of 3 nodes I already have up and running successfully (based on Substrate Node Template)

I already:

  1. Went through https://docs.substrate.io/reference/how-to-guides/offchain-workers/
  2. Tried to integrate the Paritytech official offchain exemple pallet (reference from 1.)
  3. Tried to run this end-to-end demo (also a reference from 1.)
  4. Tried to integrate this exemple (also a reference from 1.)

But there's always a problem:

  • Either the code is few years old (point 4)
  • Or at least one year old and based on Substrate node template v3 instead of v4 (point 3, and it doesn't even start anyway..)
  • The reference pallet from Parity (point 2) is just the pallet, without the code for the runtime, so a lot of dependencies are broken...

enter image description here

Would anyone here able to share a working end-to-end exemple (runtime + pallet) based on node-template v4, or be able to guide me on how to successfully update the runtime for the pallet in point 3 to start working?

Any help is appreciated :)

Lucas

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  • "an offchain worker capable of API calls on top of an existing" What do you mean exactly by API calls? pallet-election-provider-multi-phase is a pallet that uses offchain workers and is compatible with substrate master, and it does submit transactions back to the chain.
    – kianenigma
    Oct 2, 2022 at 15:16
  • Thanks a lot @MrishoLukamba, I will take a look, I hope the runtime has all necessary dependencies to make that pallet works, or that the tutorial gives some clues on how to add these dependencies, thanks again
    – PoCk3T
    Oct 3, 2022 at 18:42
  • @kianenigma , I meant "calling an external service, outside of Substrate, through a HTTP GET or HTTP PUT call, from the off-chain worker"; it looks like the pallet you suggested is very thoroughly documented according to what I've found at crates.parity.io/src/pallet_election_provider_multi_phase/…, I will definitely sit down and go deeper in it as well, thank you!
    – PoCk3T
    Oct 3, 2022 at 18:47
  • Follow the How-to guides from the Substrate page: docs.substrate.io/reference/how-to-guides/offchain-workers/…
    – Alex Bean
    Oct 5, 2022 at 14:18

1 Answer 1

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Here I integrated the official example offchain-worker pallet into a v0.9.28 Substrate node template. Check last commit to see the integration through runtime/src/lib.rs, node/src/service.rs and Cargo files.

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  • Thanks a lot, just tried and it compiles! Makes it an easy base to start from.
    – PoCk3T
    Nov 6, 2022 at 2:08

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