mirror of
https://github.com/mimblewimble/grin.git
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66 lines
2.5 KiB
Rust
66 lines
2.5 KiB
Rust
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// Copyright 2016 The Grin Developers
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! High level JSON/HTTP client API
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use hyper;
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use hyper::client::Response;
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use hyper::status::StatusClass;
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use serde::{Serialize, Deserialize};
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use serde_json;
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use rest::Error;
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/// Helper function to easily issue a HTTP GET request against a given URL that
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/// returns a JSON object. Handles request building, JSON deserialization and
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/// response code checking.
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pub fn get<'a, T>(url: &'a str) -> Result<T, Error>
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where T: Deserialize
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{
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let client = hyper::Client::new();
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let res = check_error(client.get(url).send())?;
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serde_json::from_reader(res)
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.map_err(|e| Error::Internal(format!("Server returned invalid JSON: {}", e)))
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}
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/// Helper function to easily issue a HTTP POST request with the provided JSON
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/// object as body on a given URL that returns a JSON object. Handles request
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/// building, JSON serialization and deserialization, and response code
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/// checking.
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pub fn post<'a, IN, OUT>(url: &'a str, input: &IN) -> Result<OUT, Error>
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where IN: Serialize,
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OUT: Deserialize
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{
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let in_json = serde_json::to_string(input)
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.map_err(|e| Error::Internal(format!("Could not serialize data to JSON: {}", e)))?;
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let client = hyper::Client::new();
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let res = check_error(client.post(url).body(&mut in_json.as_bytes()).send())?;
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serde_json::from_reader(res)
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.map_err(|e| Error::Internal(format!("Server returned invalid JSON: {}", e)))
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}
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// convert hyper error and check for non success response codes
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fn check_error(res: hyper::Result<Response>) -> Result<Response, Error> {
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if let Err(e) = res {
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return Err(Error::Internal(format!("Error during request: {}", e)));
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}
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let response = res.unwrap();
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match response.status.class() {
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StatusClass::Success => Ok(response),
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StatusClass::ServerError => Err(Error::Internal(format!("Server error."))),
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StatusClass::ClientError => Err(Error::Argument(format!("Argument error"))),
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_ => Err(Error::Internal(format!("Unrecognized error."))),
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}
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}
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