From d18d72b64672aecfa2753840cf9198fc4e8029f9 Mon Sep 17 00:00:00 2001
From: Josh Kuhn <deontologician@gmail.com>
Date: Wed, 25 Nov 2020 21:28:03 -0800
Subject: [PATCH] Basic functionality implemented

---
 .gitignore |    5 +-
 Cargo.lock | 1463 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml |   19 +
 src/lib.rs |  493 ++++++++++++++++++
 4 files changed, 1977 insertions(+), 3 deletions(-)
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/lib.rs

diff --git a/.gitignore b/.gitignore
index 088ba6b..2be6c91 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,10 +1,9 @@
-# Generated by Cargo
 # will have compiled files and executables
 /target/
 
-# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
-# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
 Cargo.lock
 
 # These are backup files generated by rustfmt
 **/*.rs.bk
+.vscode/
+Notes.md
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..b507d54
--- /dev/null
+++ b/Cargo.lock
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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(())
+    }
+}