1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176


extern crate serde;
extern crate serde_json;
extern crate reqwest;
extern crate rand;

mod error;
mod space;

use std::collections::BTreeMap;
use serde::ser::Serialize;
use serde_json::Value;
use serde_json::value::from_value;

pub use self::error::{GymResult, GymError};
pub use self::space::Space;


#[derive(Debug)]
pub struct State {
    pub observation:    Vec<f64>,
    pub reward:         f64,
    pub done:           bool,
    pub info:           Value,
}

pub struct Environment {
    client:         GymClient,
    instance_id:    String,
    act_space:      Space,
    obs_space:      Space,
}

impl Environment {

    pub fn action_space(&self) -> &Space {
        &self.act_space
    }

    pub fn observation_space(&self) -> &Space {
        &self.obs_space
    }

    pub fn reset(&self) -> GymResult<Vec<f64>> {
        let path = "/v1/envs/".to_string() + &self.instance_id + "/reset/";
        let observation = self.client.post(path, &Value::Null)?;

        Ok(from_value(observation["observation"].clone())
            .expect("Should only panic if the API changes"))
    }

    pub fn step(&self, action: Vec<f64>, render: bool) -> GymResult<State> {
        let mut req = BTreeMap::new();
        req.insert("render", Value::Bool(render));
        match self.act_space {
            Space::DISCRETE{..} => {
                debug_assert_eq!(action.len(), 1);
                req.insert("action", (action[0] as u64).into());
            },
            Space::BOX{ref shape, ..} => {
                debug_assert_eq!(action.len(), shape.iter().map(|&x| x as usize).product::<usize>());
                req.insert("action", action.into());
            },
            Space::TUPLE{..} => panic!("Actions for Tuple spaces not implemented yet")
        }

        let path = "/v1/envs/".to_string() + &self.instance_id + "/step/";
        let state = self.client.post(path, &req)?;

        Ok(State {
            observation: from_value(state["observation"].clone()).unwrap(),
            reward: state["reward"].as_f64().unwrap(),
            done: state["done"].as_bool().unwrap(),
            info: state["info"].clone()
        })
    }

    pub fn monitor_start(&self, directory: String, force: bool, resume: bool) -> GymResult<Value> {
        let mut req = BTreeMap::new();
        req.insert("directory", Value::String(directory));
        req.insert("force", Value::Bool(force));
        req.insert("resume", Value::Bool(resume));

        let path = "/v1/envs/".to_string() + &self.instance_id + "/monitor/start/";
        self.client.post(path, &req)
    }

    pub fn monitor_stop(&self) -> GymResult<Value> {
        let path = "/v1/envs/".to_string() + &self.instance_id + "/monitor/close/";
        self.client.post(path, &Value::Null)
    }

    pub fn upload(&self, training_dir: String, api_key: String, algorithm_id: String) -> GymResult<Value> {
        let mut req = BTreeMap::new();
        req.insert("training_dir", training_dir);
        req.insert("api_key", api_key);
        req.insert("algorithm_id", algorithm_id);

        self.client.post("/v1/upload/".to_string(), &req)
    }
}

pub struct GymClient {
    address:    String,
    handle:     reqwest::Client,
    server:     std::process::Child,
}

impl GymClient {

    pub fn new(addr: String) -> GymResult<GymClient> {

        let child = std::thread::spawn(|| -> std::process::Child {
            std::process::Command::new("python")
                .arg("server.py")
                .spawn()
                .expect("Could not initiate server")
        });

        std::thread::sleep(std::time::Duration::from_millis(2000));

        let client = Ok(GymClient {
            address: addr,
            handle: reqwest::Client::new(),
            server: child.join().unwrap()
        });

        client
    }

    pub fn make(self, env_id: &str) -> GymResult<Environment> {
        let mut req: BTreeMap<&str, &str> = BTreeMap::new();
        req.insert("env_id", env_id);

        let instance_id = self.post("/v1/envs/".to_string(), &req)?;
        let instance_id = instance_id["instance_id"].as_str().unwrap();

        let obs_space = self.get("/v1/envs/".to_string() + instance_id + "/observation_space/")?;
        let act_space = self.get("/v1/envs/".to_string() + instance_id + "/action_space/")?;

        Ok(Environment {
            client: self,
            instance_id: instance_id.to_string(),
            act_space: Space::from_json(&act_space["info"])?,
            obs_space: Space::from_json(&obs_space["info"])?})
    }

    pub fn get_envs(&self) -> GymResult<BTreeMap<String, String>> {
        let json = self.get("/v1/envs/".to_string())?;
        Ok(from_value(json["all_envs"].clone()).unwrap())
    }

    fn post<T: Serialize>(&self, route: String, request: &T) -> GymResult<Value> {
        let url = self.address.clone() + &route;
        match self.handle.post(&url).json(request).send()?.json() {
            Ok(val) => Ok(val),
            Err(e)  => Err(e.into()),
        }

    }

    fn get(&self, route: String) -> GymResult<Value> {
        let url = self.address.clone() + &route;
        match self.handle.get(&url).send()?.json() {
            Ok(val) => Ok(val),
            Err(e)  => Err(e.into()),
        }
    }
}

impl Drop for GymClient {
    fn drop(&mut self) {
        self.server.kill()
            .expect("Error killing Python process (server.py)");
    }
}