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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..40169f7
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "openai-api"
+version = "0.1.0"
+authors = ["Josh Kuhn <deontologician@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+reqwest = { version = "0.10.9", features = ["json"] }
+thiserror = "^1.0.22"
+serde = { version = "^1.0.117", features = ["derive"] }
+tokio = { version = "^0.2.5", features = ["full"]}
+serde_json = "*"
+derive_builder = "0.9.0"
+
+[dev-dependencies]
+mockito = "0.28.0"
+maplit = "1.0.2"
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..917b591
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,493 @@
+#[macro_use]
+extern crate derive_builder;
+
+use reqwest::header::HeaderMap;
+use thiserror::Error;
+
+type Result<T> = std::result::Result<T, OpenAIError>;
+
+#[allow(clippy::clippy::default_trait_access)]
+pub mod api {
+
+ use std::collections::HashMap;
+
+ use serde::{Deserialize, Serialize};
+
+ /// Container type. Used in the api, but not useful for clients of this library
+ #[derive(Deserialize, Debug)]
+ pub(super) struct Container<T> {
+ pub data: Vec<T>,
+ }
+
+ /// Engine description type
+ #[derive(Deserialize, Debug, Eq, PartialEq)]
+ pub struct EngineInfo {
+ pub id: Engine,
+ pub owner: String,
+ pub ready: bool,
+ }
+
+ /// Engine types, known and unknown
+ #[derive(Deserialize, Serialize, Debug, Ord, PartialOrd, Eq, PartialEq, Copy, Clone)]
+ #[serde(rename_all = "kebab-case")]
+ pub enum Engine {
+ Ada,
+ Babbage,
+ Curie,
+ Davinci,
+ #[serde(rename = "content-filter-alpha-c4")]
+ ContentFilter,
+ #[serde(other)]
+ Other,
+ }
+
+ // Custom Display to lowercase things
+ impl std::fmt::Display for Engine {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+ match self {
+ Engine::Ada => f.write_str("ada"),
+ Engine::Babbage => f.write_str("babbage"),
+ Engine::Curie => f.write_str("curie"),
+ Engine::Davinci => f.write_str("davinci"),
+ Engine::ContentFilter => f.write_str("content-filter-alpha-c4"),
+ _ => panic!("Can't write out Other engine id"),
+ }
+ }
+ }
+
+ /// Options that affect the result
+ #[derive(Serialize, Debug, Builder)]
+ pub struct CompletionArgs {
+ #[builder(setter(into), default = "\"<|endoftext|>\".into()")]
+ prompt: String,
+ #[builder(default = "16")]
+ max_tokens: u64,
+ #[builder(default = "1.0")]
+ temperature: f64,
+ #[builder(default = "1.0")]
+ top_p: f64,
+ #[builder(default = "1")]
+ n: u64,
+ #[builder(setter(strip_option), default)]
+ logprobs: Option<u64>,
+ #[builder(default = "false")]
+ echo: bool,
+ #[builder(setter(strip_option), default)]
+ stop: Option<Vec<String>>,
+ #[builder(default = "0.0")]
+ presence_penalty: f64,
+ #[builder(default = "0.0")]
+ frequency_penalty: f64,
+ #[builder(default)]
+ logit_bias: HashMap<String, f64>,
+ }
+ /* {
+ "stream": false, // SSE streams back results
+ "best_of": Option<u64>, //cant be used with stream
+ }
+ */
+ // TODO: add validators for the different arguments
+
+ impl Default for CompletionArgs {
+ fn default() -> Self {
+ CompletionArgsBuilder::default()
+ .build()
+ .expect("Client error, invalid defaults")
+ }
+ }
+
+ impl From<&str> for CompletionArgs {
+ fn from(prompt_string: &str) -> Self {
+ Self {
+ prompt: prompt_string.into(),
+ ..CompletionArgs::default()
+ }
+ }
+ }
+
+ /// Represents a non-streamed completion response
+ #[derive(Deserialize, Debug)]
+ pub struct Completion {
+ id: String,
+ object: String,
+ created: u64,
+ model: String,
+ choices: Vec<Choice>,
+ }
+
+ /// Represents a single choice
+ #[derive(Deserialize, Debug)]
+ pub struct Choice {
+ text: String,
+ index: u64,
+ logprobs: Option<LogProbs>,
+ finish_reason: FinishReason,
+ }
+
+ /// Represents a logprobs subdocument
+ #[derive(Deserialize, Debug)]
+ pub struct LogProbs {
+ tokens: Vec<String>,
+ token_logprobs: Vec<Option<f64>>,
+ top_logprobs: Vec<Option<HashMap<String, f64>>>,
+ text_offset: Vec<u64>,
+ }
+
+ #[derive(Deserialize, Debug)]
+ #[serde(rename_all = "kebab-case")]
+ pub enum FinishReason {
+ Length,
+ Stop,
+ }
+
+ #[derive(Deserialize, Debug, Eq, PartialEq)]
+ pub struct ErrorMessage {
+ pub message: String,
+ #[serde(rename = "type")]
+ pub error_type: String,
+ }
+
+ #[derive(Deserialize, Debug)]
+ pub struct ErrorWrapper {
+ pub error: ErrorMessage,
+ }
+}
+
+#[derive(Error, Debug)]
+pub enum OpenAIError {
+ #[error("Invalid secret key")]
+ InvalidAPIKey {
+ #[from]
+ source: reqwest::header::InvalidHeaderValue,
+ },
+ #[error("API Returned an Error document")]
+ APIError(api::ErrorMessage),
+}
+
+pub struct OpenAIClient {
+ client: reqwest::Client,
+ root: String,
+}
+
+impl OpenAIClient {
+ /// Creates a new `OpenAIClient`
+ ///
+ /// # Errors
+ /// `OpenAIError::InvalidAPIKey` if the api token has invalid characters
+ pub fn new(token: &str) -> Result<Self> {
+ let mut headers = HeaderMap::new();
+ headers.insert(
+ reqwest::header::AUTHORIZATION,
+ reqwest::header::HeaderValue::from_str(&format!("Bearer {}", token))?,
+ );
+ Ok(Self {
+ client: reqwest::Client::builder()
+ .default_headers(headers)
+ .build()
+ .expect("Client library error. Should have constructed a valid http client."),
+ root: "https://api.openai.com/v1".into(),
+ })
+ }
+
+ /// Private helper for making gets
+ async fn get<T: serde::de::DeserializeOwned>(&self, endpoint: &str) -> Result<T> {
+ let url = &format!("{}/{}", self.root, endpoint);
+ let response = self
+ .client
+ .get(url)
+ .send()
+ .await
+ .expect("Client error. Should have passed a valid url");
+ if response.status() != 200 {
+ return Err(OpenAIError::APIError(
+ response
+ .json::<api::ErrorWrapper>()
+ .await
+ .expect("The API has returned something funky")
+ .error,
+ ));
+ }
+ Ok(response.json::<T>().await.unwrap())
+ }
+
+ /// Lists the currently available engines.
+ ///
+ /// Provides basic information about each one such as the owner and availability.
+ ///
+ /// # Errors
+ /// - `OpenAIError::APIError` if the server returns an error
+ /// - `OpenAIError::ServerFormatError` if the json response wasn't parseable (most
+ /// likely a bug in this client, please report it)
+ pub async fn engines(&self) -> Result<Vec<api::EngineInfo>> {
+ self.get("engines").await.map(|r: api::Container<_>| r.data)
+ }
+
+ /// Retrieves an engine instance
+ /// Provides basic information about the engine such as the owner and availability.
+ ///
+ /// # Errors
+ /// - `OpenAIError::APIError` if the server returns an error
+ /// - `OpenAIError::ServerFormatError` if the json response wasn't parseable (most
+ /// likely a bug in this client, please report it)
+ pub async fn engine(&self, engine: api::Engine) -> Result<api::EngineInfo> {
+ self.get(&format!("engines/{}", engine)).await
+ }
+
+ // Private helper to generate post requests. Needs to be a bit more flexible than
+ // get because it should support SSE eventually
+ async fn post<B: serde::ser::Serialize>(
+ &self,
+ endpoint: &str,
+ body: B,
+ ) -> Result<reqwest::Response> {
+ let url = &format!("{}/{}", self.root, endpoint);
+ let response = self
+ .client
+ .post(url)
+ .json(&body)
+ .send()
+ .await
+ .expect("Client library error, json failed to parse");
+ if response.status() != 200 {
+ return Err(OpenAIError::APIError(
+ response
+ .json::<api::ErrorWrapper>()
+ .await
+ .expect("The API has returned something funky")
+ .error,
+ ));
+ }
+ Ok(response)
+ }
+ /// Get predicted completion of the prompt
+ ///
+ /// # Errors
+ /// - `OpenAIError::APIError` if the api returns an error
+ pub async fn complete(
+ &self,
+ engine: api::Engine,
+ prompt: impl Into<api::CompletionArgs>,
+ ) -> Result<api::Completion> {
+ Ok(self
+ .post(&format!("engines/{}/completions", engine), prompt.into())
+ .await?
+ //.text()
+ .json()
+ .await
+ .expect("Client error. JSON didn't parse correctly."))
+ }
+}
+
+#[cfg(test)]
+mod unit {
+
+ use crate::{api, OpenAIClient, OpenAIError};
+
+ fn mocked_client() -> OpenAIClient {
+ let mut client = OpenAIClient::new("bogus").unwrap();
+ client.root = mockito::server_url();
+ client
+ }
+
+ #[test]
+ fn can_create_client() {
+ let _c = mocked_client();
+ }
+
+ #[test]
+ fn parse_engine_info() -> Result<(), Box<dyn std::error::Error>> {
+ let example = r#"{
+ "id": "ada",
+ "object": "engine",
+ "owner": "openai",
+ "ready": true
+ }"#;
+ let ei: api::EngineInfo = serde_json::from_str(example)?;
+ assert_eq!(
+ ei,
+ api::EngineInfo {
+ id: api::Engine::Ada,
+ owner: "openai".into(),
+ ready: true,
+ }
+ );
+ Ok(())
+ }
+
+ #[tokio::test]
+ async fn parse_engines() -> crate::Result<()> {
+ use api::{Engine, EngineInfo};
+ let _m = mockito::mock("GET", "/engines")
+ .with_status(200)
+ .with_header("content-type", "text/json")
+ .with_body(
+ r#"{
+ "object": "list",
+ "data": [
+ {
+ "id": "ada",
+ "object": "engine",
+ "owner": "openai",
+ "ready": true
+ },
+ {
+ "id": "babbage",
+ "object": "engine",
+ "owner": "openai",
+ "ready": true
+ },
+ {
+ "id": "experimental-engine-v7",
+ "object": "engine",
+ "owner": "openai",
+ "ready": false
+ },
+ {
+ "id": "curie",
+ "object": "engine",
+ "owner": "openai",
+ "ready": true
+ },
+ {
+ "id": "davinci",
+ "object": "engine",
+ "owner": "openai",
+ "ready": true
+ },
+ {
+ "id": "content-filter-alpha-c4",
+ "object": "engine",
+ "owner": "openai",
+ "ready": true
+ }
+ ]
+ }"#,
+ )
+ .create();
+ let expected = vec![
+ EngineInfo {
+ id: Engine::Ada,
+ owner: "openai".into(),
+ ready: true,
+ },
+ EngineInfo {
+ id: Engine::Babbage,
+ owner: "openai".into(),
+ ready: true,
+ },
+ EngineInfo {
+ id: Engine::Other,
+ owner: "openai".into(),
+ ready: false,
+ },
+ EngineInfo {
+ id: Engine::Curie,
+ owner: "openai".into(),
+ ready: true,
+ },
+ EngineInfo {
+ id: Engine::Davinci,
+ owner: "openai".into(),
+ ready: true,
+ },
+ EngineInfo {
+ id: Engine::ContentFilter,
+ owner: "openai".into(),
+ ready: true,
+ },
+ ];
+ let response = mocked_client().engines().await?;
+ assert_eq!(response, expected);
+ Ok(())
+ }
+
+ #[tokio::test]
+ async fn engine_error_response() -> crate::Result<()> {
+ let _m = mockito::mock("GET", "/engines/davinci")
+ .with_status(404)
+ .with_header("content-type", "text/json")
+ .with_body(
+ r#"{
+ "error": {
+ "code": null,
+ "message": "Some kind of error happened",
+ "type": "some_error_type"
+ }
+ }"#,
+ )
+ .create();
+ let expected = api::ErrorMessage {
+ message: "Some kind of error happened".into(),
+ error_type: "some_error_type".into(),
+ };
+ let response = mocked_client().engine(api::Engine::Davinci).await;
+ if let Result::Err(OpenAIError::APIError(msg)) = response {
+ assert_eq!(expected, msg);
+ }
+ Ok(())
+ }
+}
+#[cfg(test)]
+mod integration {
+
+ use api::ErrorMessage;
+
+ use crate::{OpenAIClient, OpenAIError, api};
+
+ /// Used by tests to get a client to the actual api
+ fn get_client() -> OpenAIClient {
+ let sk = std::env::var("OPENAI_SK").expect(
+ "To run integration tests, you must put set the OPENAI_SK env var to your api token",
+ );
+ OpenAIClient::new(&sk).expect("client build failed")
+ }
+
+ #[tokio::test]
+ async fn can_get_engines() {
+ let client = get_client();
+ client.engines().await.unwrap();
+ }
+ #[tokio::test]
+ async fn can_get_engine() {
+ let client = get_client();
+ let result = client.engine(api::Engine::Ada).await;
+ match result {
+ Err(OpenAIError::APIError(ErrorMessage{message, error_type})) => {
+ assert_eq!(message, "No engine with that ID: ada");
+ assert_eq!(error_type, "invalid_request_error");
+ }
+ _ => {panic!("Expected an error message, got {:?}", result)}
+ }
+ }
+
+ #[tokio::test]
+ async fn complete_string() -> crate::Result<()> {
+ let client = get_client();
+ client.complete(api::Engine::Ada, "Hey there").await?;
+ Ok(())
+ }
+
+ #[tokio::test]
+ async fn complete_explicit_params() -> crate::Result<()> {
+ let client = get_client();
+ let args = api::CompletionArgsBuilder::default()
+ .prompt("Once upon a time,")
+ .max_tokens(10)
+ .temperature(0.5)
+ .top_p(0.5)
+ .n(1)
+ .logprobs(3)
+ .echo(false)
+ .stop(vec!["\n".into()])
+ .presence_penalty(0.5)
+ .frequency_penalty(0.5)
+ .logit_bias(maplit::hashmap! {
+ "1".into() => 1.0,
+ "23".into() => 0.0,
+ })
+ .build()
+ .expect("Build should have succeeded");
+ client.complete(api::Engine::Ada, args).await?;
+ Ok(())
+ }
+}