gptcli 0.1.0

A small CLI tool and Library for interacting with OpenAI APIs
Documentation 
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use std::error::Error;
use std::fmt;
use serde::{Deserialize, Serialize};

const URL_COMPLETION: &str = "https://api.openai.com/v1/chat/completions";

#[derive(Debug, Deserialize, Serialize)]
struct Config {
    openai: OpenAI
}

#[derive(Debug, Deserialize, Serialize)]
struct OpenAI{
    model: String,
    access_key: String
}

#[derive(Debug, Deserialize, Serialize)]
pub enum Role {
    System,
    User,
    Assistant
}

impl fmt::Display for Role {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            Role::System => write!(f, "system"),
            Role::User => write!(f, "user"),
            Role::Assistant => write!(f, "assistant"),
        }
    }
}


#[derive(Debug, Deserialize, Serialize)]
struct CompletionBody {
    model: String,
    messages: Vec<Message>
}

#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct CompletionResponse{
    pub id: String,
    pub object: String,
    pub created: i64,
    pub model: String,
    pub usage: UsageStats,
    pub choices: Vec<CompletionChoice>,
}

#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct UsageStats {
    #[serde(rename = "prompt_tokens")]
    pub prompt_tokens: i64,
    #[serde(rename = "completion_tokens")]
    pub completion_tokens: i64,
    #[serde(rename = "total_tokens")]
    pub total_tokens: i64,
}

#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct CompletionChoice {
    pub message: Message,
    #[serde(rename = "finish_reason")]
    pub finish_reason: String,
    pub index: i64,
}

#[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct Message {
    pub role: String,
    pub content: String,
}

pub struct Gptcli {
    config: Config,
}

impl Gptcli {
    pub fn new(config_file: String) -> Gptcli {
        let config = Gptcli::load_config(&config_file);
        Gptcli {
            config
        }
    }

    fn load_config(config_file: &str) -> Config {
        let config = match std::fs::read_to_string(config_file) {
            Ok(c) => c,
            Err(e) => {
                println!("Error: {}", e);
                std::process::exit(1);
            }
        };

        let config: Config = match toml::from_str(&config) {
            Ok(c) => c,
            Err(e) => {
                println!("Error: {}", e);
                std::process::exit(1);
            }
        };

        config
    }

    pub fn submit_messages(&self, messages: Vec<Message>) -> Result<CompletionResponse, Box<dyn Error>> {
        let cb = CompletionBody {
            model: self.config.openai.model.to_string(),
            messages
        };

        let client = reqwest::blocking::Client::new();
        let res = client.post(URL_COMPLETION)
            .header("Authorization", format!("Bearer {}", self.config.openai.access_key))
            .json(&cb)
            .send()?
            .text()?;

        let res: CompletionResponse = match serde_json::from_str(&res) {
            Ok(m) => m,
            Err(e) => {
                println!("Message: {}", res);
                println!("Error: {}", e);
                return Err(Box::new(e));
            }
        };

        Ok(res)
    }
}