Prepare v0.9.0 release for bumped MSRV and dependency updates

Create a new minor release because the MSRV has been raised from
1.85.0 to 1.90.0. A downstream dependency silently raised its MSRV,
which would cause build failures for users relying on our previously
announced MSRV. Bumps all crate versions from 0.8.0 to 0.9.0, fixes
new clippy lints (collapsible_if, manual_is_multiple_of) introduced
in Rust 1.90, and adds release notes.

Fixes #91

Author: tillrohrmann

Cargo.toml

@@ -1,11 +1,11 @@
 [package]
 name = "restate-sdk"
-version = "0.8.0"
+version = "0.9.0"
 edition = "2024"
 description = "Restate SDK for Rust"
 license = "MIT"
 repository = "https://github.com/restatedev/sdk-rust"
-rust-version = "1.85.0"
+rust-version = "1.90.0"
 
 [[example]]
 name = "tracing"
@@ -35,8 +35,8 @@ hyper-util = { version = "0.1", features = ["tokio", "server", "server-graceful"
 pin-project-lite = "0.2"
 rand = { version = "0.10", optional = true }
 regress = "0.10"
-restate-sdk-macros = { version = "0.8", path = "macros" }
-restate-sdk-shared-core = { version = "=0.7.1", features = ["request_identity", "sha2_random_seed", "http"] }
+restate-sdk-macros = { version = "0.9", path = "macros" }
+restate-sdk-shared-core = { version = "=0.9.0", features = ["request_identity", "sha2_random_seed", "http"] }
 schemars = { version = "1.2", optional = true }
 serde = "1.0"
 serde_json = "1.0"

README.md

@@ -190,13 +190,13 @@ The Rust SDK is currently in active development, and might break across releases
 
 The compatibility with Restate is described in the following table:
 
-| Restate Server\sdk-rust | < 0.4            | 0.4 - 0.5 | 0.6              | 0.7              | 0.8              |
-|-------------------------|------------------|-----------|------------------|------------------|------------------|
-| < 1.3                   | ✅                | ❌         | ❌                | ❌                | ❌                |
-| 1.3                     | ✅                | ✅         | ✅ <sup>(1)</sup> | ✅ <sup>(2)</sup> | ✅ <sup>(2)</sup> |
-| 1.4                     | ✅                | ✅         | ✅                | ✅ <sup>(2)</sup> | ✅ <sup>(2)</sup> |
-| 1.5                     | ⚠ <sup>(3)</sup> | ✅         | ✅                | ✅                | ✅                |
-| 1.6                     | ❌ <sup>(4)</sup> | ✅         | ✅                | ✅                | ✅                |
+| Restate Server\sdk-rust | < 0.4            | 0.4 - 0.5 | 0.6              | 0.7 - 0.9        |
+|-------------------------|------------------|-----------|------------------|------------------|
+| < 1.3                   | ✅                | ❌         | ❌                | ❌                |
+| 1.3                     | ✅                | ✅         | ✅ <sup>(1)</sup> | ✅ <sup>(2)</sup> |
+| 1.4                     | ✅                | ✅         | ✅                | ✅ <sup>(2)</sup> |
+| 1.5                     | ⚠ <sup>(3)</sup> | ✅         | ✅                | ✅                |
+| 1.6                     | ❌ <sup>(4)</sup> | ✅         | ✅                | ✅                |
 
 <sup>(1)</sup> **Note** `bind_with_options` works only from Restate 1.4 onward.
 

examples/failures.rs

@@ -17,7 +17,7 @@ impl FailureExample for FailureExampleImpl {
     async fn do_run(&self, context: Context<'_>) -> Result<(), TerminalError> {
         context
             .run::<_, _, ()>(|| async move {
-                if rand::rng().next_u32() % 4 == 0 {
+                if rand::rng().next_u32().is_multiple_of(4) {
                     Err(TerminalError::new("Failed!!!"))?
                 }
 

macros/Cargo.toml

@@ -1,11 +1,11 @@
 [package]
 name = "restate-sdk-macros"
-version = "0.8.0"
+version = "0.9.0"
 edition = "2024"
 description = "Restate SDK for Rust macros"
 license = "MIT"
 repository = "https://github.com/restatedev/sdk-rust"
-rust-version = "1.85.0"
+rust-version = "1.90.0"
 
 [lib]
 proc-macro = true

release-notes/README.md

@@ -8,7 +8,7 @@ This directory contains release notes for the Restate Rust SDK, organized to tra
 release-notes/
 ├── README.md          # This file
 ├── v0.8.0.md          # Consolidated release notes for v0.8.0
-├── v0.9.0.md          # (future releases follow the same pattern)
+├── v0.9.0.md          # Consolidated release notes for v0.9.0
 └── unreleased/        # Release notes for changes not yet released
     └── *.md           # Individual release note files
 ```

release-notes/v0.9.0.md

@@ -0,0 +1,99 @@
+# Restate Rust SDK v0.9.0 Release Notes
+
+## Highlights
+
+- **MSRV raised to 1.90.0** — a downstream dependency silently raised its MSRV, which would cause build failures for users relying on our previously announced MSRV
+- **`#[lazy_state]` handler attribute** — opt into lazy state loading on a per-handler basis
+
+## Table of Contents
+
+- [Breaking Changes](#breaking-changes)
+- [New Features](#new-features)
+
+## Breaking Changes
+
+### Dependency bumps with user-facing API changes
+
+Several dependencies have been bumped. Most are transparent, but the following affect user code:
+
+#### `rand` 0.9 → 0.10
+
+The `rand()` method on context types returns `&mut rand::prelude::StdRng`. In rand 0.10, the trait that provides convenience methods like `.random()` and `.random_range()` was renamed from `Rng` to `RngExt`. If you import this trait, update your code:
+
+```diff
+- use rand::Rng;
++ use rand::RngExt;
+```
+
+Additionally, the low-level trait `RngCore` (providing `next_u32()`, `next_u64()`, `fill_bytes()`) was renamed to `Rng`:
+
+```diff
+- use rand::RngCore;
++ use rand::Rng;
+```
+
+`StdRng` no longer implements `Clone`. If you were cloning the RNG returned by `ctx.rand()`, this is no longer possible.
+
+#### Other dependency bumps (no user-facing changes)
+
+The following dependencies were also bumped but require no changes to user code:
+
+| Dependency | Old | New |
+|---|---|---|
+| `restate-sdk-shared-core` | `0.6.0` | `0.9.0` |
+| `aws_lambda_events` | `0.16.1` | `1.0` |
+| `lambda_runtime` | `0.14.2` | `1.0` |
+| `typify` | `0.1.0` | `0.6` |
+| `jsonptr` | `0.5.1` | `0.7` |
+| `regress` | `0.10.3` | `0.10` |
+| `bytes` | `1.10` | `1.11` |
+| `http` | `1.3` | `1.4` |
+| `hyper` | `1.6` | `1.8` |
+| `tokio` | `1.44` | `1.49` |
+| `uuid` | `1.16.0` | `1.20` |
+| `schemars` | `1.0.0` | `1.2` |
+| `reqwest` (dev) | `0.12` | `0.13` |
+| `testcontainers` | `0.23.3` | `0.27` |
+
+### MSRV raised to 1.90.0
+
+The minimum supported Rust version (MSRV) has been raised from **1.85.0** to **1.90.0**.
+
+This bump was necessary because a downstream dependency raised its own MSRV without announcing it. Without this change, users relying on our previously announced MSRV of 1.85.0 would encounter build failures. Any user building with a toolchain between 1.85.0 and 1.87.x is affected. Rather than pinning to an older version of the dependency, we chose to follow the ecosystem forward.
+
+**Impact on Users:**
+- Projects using a Rust toolchain older than 1.90.0 will fail to compile against this version of the SDK
+- Your own crate's `edition` field does not need to change, but your installed Rust toolchain must be >= 1.90.0
+
+**Migration Guidance:**
+
+Update your Rust toolchain:
+
+```bash
+rustup update stable
+```
+
+Verify your version:
+
+```bash
+rustc --version  # Must be >= 1.90.0
+```
+
+## New Features
+
+### `#[lazy_state]` handler attribute
+
+You can now annotate individual handlers with `#[lazy_state]` to enable lazy state loading for that handler. When enabled, state is fetched on demand rather than eagerly loaded when the handler is invoked.
+
+**Example:**
+
+```rust
+#[restate_sdk::object]
+pub trait MyObject {
+    #[lazy_state]
+    async fn my_handler(name: String) -> Result<String, HandlerError>;
+}
+```
+
+**Related Issues:**
+- PR [#90](https://github.com/restatedev/sdk-rust/pull/90)

src/endpoint/context.rs

@@ -402,7 +402,7 @@ impl ContextInternal {
             .and_then(|input| {
                 inner_lock
                     .vm
-                    .sys_call(target, input, PayloadOptions::stable())
+                    .sys_call(target, input, None, PayloadOptions::stable())
                     .map_err(Into::into)
             });
 
@@ -500,6 +500,7 @@ impl ContextInternal {
                     .expect("Duration since unix epoch cannot fail")
                     + delay
             }),
+            None,
             PayloadOptions::stable(),
         ) {
             Ok(h) => h,
@@ -755,10 +756,10 @@ impl ContextInternal {
         let mut inner_lock = must_lock!(self.inner);
 
         let out = inner_lock.vm.take_output();
-        if let TakeOutputResult::Buffer(b) = out {
-            if !inner_lock.write.send(b) {
-                // Nothing we can do anymore here
-            }
+        if let TakeOutputResult::Buffer(b) = out
+            && !inner_lock.write.send(b)
+        {
+            // Nothing we can do anymore here
         }
     }
 

src/filter.rs

@@ -54,35 +54,35 @@ impl<S: Subscriber + for<'lookup> LookupSpan<'lookup>> Filter<S> for ReplayAware
         if let Some(scope) = cx.event_scope(event) {
             let iterator = scope.from_root();
             for span in iterator {
-                if span.name() == "restate_sdk_endpoint_handle" {
-                    if let Some(replay) = span.extensions().get::<ReplayField>() {
-                        return !replay.0;
-                    }
+                if span.name() == "restate_sdk_endpoint_handle"
+                    && let Some(replay) = span.extensions().get::<ReplayField>()
+                {
+                    return !replay.0;
                 }
             }
         }
         true
     }
 
     fn on_new_span(&self, attrs: &Attributes<'_>, id: &Id, ctx: Context<'_, S>) {
-        if let Some(span) = ctx.span(id) {
-            if span.name() == "restate_sdk_endpoint_handle" {
-                let mut visitor = ReplayFieldVisitor(false);
-                attrs.record(&mut visitor);
-                let mut extensions = span.extensions_mut();
-                extensions.replace::<ReplayField>(ReplayField(visitor.0));
-            }
+        if let Some(span) = ctx.span(id)
+            && span.name() == "restate_sdk_endpoint_handle"
+        {
+            let mut visitor = ReplayFieldVisitor(false);
+            attrs.record(&mut visitor);
+            let mut extensions = span.extensions_mut();
+            extensions.replace::<ReplayField>(ReplayField(visitor.0));
         }
     }
 
     fn on_record(&self, id: &Id, values: &Record<'_>, ctx: Context<'_, S>) {
-        if let Some(span) = ctx.span(id) {
-            if span.name() == "restate_sdk_endpoint_handle" {
-                let mut visitor = ReplayFieldVisitor(false);
-                values.record(&mut visitor);
-                let mut extensions = span.extensions_mut();
-                extensions.replace::<ReplayField>(ReplayField(visitor.0));
-            }
+        if let Some(span) = ctx.span(id)
+            && span.name() == "restate_sdk_endpoint_handle"
+        {
+            let mut visitor = ReplayFieldVisitor(false);
+            values.record(&mut visitor);
+            let mut extensions = span.extensions_mut();
+            extensions.replace::<ReplayField>(ReplayField(visitor.0));
         }
     }
 }

test-services/Cargo.toml

@@ -3,7 +3,7 @@ name = "test-services"
 version = "0.1.0"
 edition = "2024"
 publish = false
-rust-version = "1.85.0"
+rust-version = "1.90.0"
 
 [dependencies]
 anyhow = "1.0"

testcontainers/Cargo.toml

@@ -1,18 +1,18 @@
 [package]
 name = "restate-sdk-testcontainers"
-version = "0.8.0"
+version = "0.9.0"
 edition = "2024"
 description = "Restate SDK Testcontainers utilities"
 license = "MIT"
 repository = "https://github.com/restatedev/sdk-rust"
-rust-version = "1.85.0"
+rust-version = "1.90.0"
 
 
 [dependencies]
 anyhow = "1.0"
 futures = "0.3"
 reqwest = { version= "0.13", features = ["json"] }
-restate-sdk = { version = "0.8.0", path = "../" }
+restate-sdk = { version = "0.9.0", path = "../" }
 serde = "1.0"
 testcontainers = { version = "0.27", features = ["http_wait"] }
 tokio = "1.49"