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codegen: Fetch and decode metadata version then fallback (#1092)

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* codegen: Fetch and decode metadata version then fallback

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* cli: Add `unstable-metadata` attribute to the subxt macro

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* docs: Add missing comma

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* macro: Add `GenerateRuntimeApi`

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Update subxt/src/lib.rs

Co-authored-by: James Wilson <james@jsdw.me>

* Update macro/src/lib.rs

Co-authored-by: James Wilson <james@jsdw.me>

* subxt: Adjust docs

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* cli: Import `GenerateRuntimeApi`

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

---------

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
Co-authored-by: James Wilson <james@jsdw.me>
This commit is contained in:
Alexandru Vasile
2023-07-25 14:14:18 +03:00
committed by GitHub
parent 44b1690170
commit c6e4c7294d
5 changed files with 198 additions and 130 deletions
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subxt/src/lib.rs
+16
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@@ -279,6 +279,7 @@ pub mod ext {
/// )]
/// mod polkadot {}
/// ```
///
/// ## `no_default_derives`
///
/// By default, the macro will add all derives necessary for the generated code to play nicely with Subxt. Adding this attribute
@@ -298,4 +299,19 @@ pub mod ext {
/// `scale_decode::DecodeAsType` (because we add `#[codec(..)]` attributes on some fields/types during codegen), and you must use this
/// feature in conjunction with `runtime_types_only` (or manually specify a bunch of defaults to make codegen work properly when
/// generating the subxt interfaces).
///
/// ## `unstable_metadata`
///
/// This attribute works only in combination with `runtime_metadata_url`. By default, the macro will fetch the latest stable
/// version of the metadata from the target node. This attribute makes the codegen attempt to fetch the unstable version of
/// the metadata first. This is **not recommended** in production code, since the unstable metadata a node is providing is likely
/// to be incompatible with Subxt.
///
/// ```rust,no_run
/// #[subxt::subxt(
/// runtime_metadata_url = "wss://rpc.polkadot.io:443",
/// unstable_metadata
/// )]
/// mod polkadot {}
/// ```
pub use subxt_macro::subxt;