[elixir] Fix eppo_core package import (#254)

Author: schmit

.changeset/chilly-rings-wave.md

@@ -0,0 +1,5 @@
+---
+"elixir-sdk": patch
+---
+
+Fix eppo_core import

elixir-sdk/.cargo/config.toml

@@ -2,4 +2,4 @@
 rustflags = [
     "-C", "link-arg=-undefined",
     "-C", "link-arg=dynamic_lookup",
-]
+]

elixir-sdk/.cargo/config.toml.template

@@ -0,0 +1,10 @@
+[target.'cfg(target_os = "macos")']
+rustflags = [
+    "-C", "link-arg=-undefined",
+    "-C", "link-arg=dynamic_lookup",
+]
+
+# Copy this file to .cargo/config.toml (without the .template extension)
+# to use the local eppo_core package during development.
+[patch.crates-io]
+eppo_core = { path = "../eppo_core" } 

elixir-sdk/Cargo.lock

@@ -110,9 +110,34 @@ Or you can use the client directly:
 EppoSdk.Client.wait_for_initialization(client)
 ```
 
-## Development
+
+
+### Local Development with eppo_core
+
+When developing the Elixir SDK alongside eppo_core, you can configure Cargo to use the local eppo_core package instead of the published version:
+
+1. Copy the template configuration file:
+   ```bash
+   cp .cargo/config.toml.template .cargo/config.toml
+   ```
+
+2. This will configure Cargo to use the local eppo_core package located at `../eppo_core` relative to the elixir-sdk directory.
+
+3. Compile the SDK to use your local eppo_core version:
+   ```bash
+   mix compile
+   ```
+
+4. Any changes to the local eppo_core package will now be reflected when you recompile the Elixir SDK.
+
+For publishing releases, make sure to:
+1. Test with the published eppo_core version (remove the .cargo/config.toml)
+2. Ensure the version in native/sdk_core/Cargo.toml matches the published eppo_core version
+
+### Testing
 
 To run the tests:
 ```bash
 mix test
 ```
+

elixir-sdk/README.md

@@ -10,7 +10,7 @@ crate-type = ["cdylib"]
 
 [dependencies]
 rustler = { version = "0.36.1", features = ["serde"] }
-eppo_core = { version = "=9.1.1", path = "../../../eppo_core", features = ["rustler"] }
+eppo_core = { version = "=9.1.1", features = ["rustler"] }
 serde_json = "1.0.138"
 tokio = { version = "1.44.1", default-features = false, features = ["time"] }
 log = "0.4.21"