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sc-chain-spec: add support for custom host functions (#2190)

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Genesis building in runtime may involve calling some custom host
functions. This PR allows to pass `HostFunctions` into the `ChainSpec`
struct, which in turn are passed to `WasmExecutor`. The `ChainSpec` now
has extended host functions type parameter:
```
pub struct ChainSpec<G, E = NoExtension, EHF = ()>
```
which will be combined with the default set
(`sp_io::SubstrateHostFunctions`) in an instance of `WasmExecutor` used
to build the genesis config.

Fix for #2188

---------

Co-authored-by: Davide Galassi <davxy@datawok.net>
Co-authored-by: Bastian Köcher <git@kchr.de>
This commit is contained in:
Michal Kucharczyk
2023-11-08 17:31:37 +01:00
committed by GitHub
parent ffa0e30e58
commit b8acc57c50
3 changed files with 79 additions and 37 deletions
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substrate/bin/utils/chain-spec-builder/src/lib.rs
+2 -1
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@@ -338,7 +338,8 @@ pub fn generate_chain_spec_for_runtime(cmd: &RuntimeCmd) -> Result<String, Strin
)?)
},
GenesisBuildAction::Default(DefaultCmd { ref default_config_path }) => {
let caller = GenesisConfigBuilderRuntimeCaller::new(&code[..]);
let caller: GenesisConfigBuilderRuntimeCaller =
GenesisConfigBuilderRuntimeCaller::new(&code[..]);
let default_config = caller
.get_default_config()
.map_err(|e| format!("getting default config from runtime should work: {e}"))?;