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* @file rpc connection built with http
* @author atom-yang
*/
import { stringify } from 'query-string';
const defaultHeaders = {
Accept: 'text/plain;v=1.0',
'Content-Type': 'application/json'
};
let RequestLibrary = {};
let RequestLibraryXMLOnly = null;
let isFetch = false;
let NodeHeaders;
if (process.env.RUNTIME_ENV === 'browser') {
// For browsers use DOM Api XMLHttpRequest
// serviceworker without window and document, only with self
// eslint-disable-next-line no-restricted-globals
const _self = typeof self === 'object' ? self : {};
const _window = typeof window === 'object' ? window : _self;
if (typeof _window.XMLHttpRequest !== 'undefined') {
RequestLibrary = _window.XMLHttpRequest;
isFetch = false;
} else Eif (typeof _window.fetch !== 'undefined') {
RequestLibrary = _window.fetch;
isFetch = true;
}
} else E{
// For node use xmlhttprequest
// eslint-disable-next-line global-require
RequestLibraryXMLOnly = require('xmlhttprequest').XMLHttpRequest;
// eslint-disable-next-line global-require
const NodeFetch = require('node-fetch');
RequestLibrary = NodeFetch.default;
NodeHeaders = NodeFetch.Headers;
isFetch = true;
}
export default class HttpProvider {
constructor(
host = 'http://localhost:8545',
timeout = 8000,
headers = defaultHeaders,
// support node-fetch options
options = {}
) {
this.host = host.replace(/\/$/, '');
this.timeout = timeout;
this.headers = {};
this.options = options;
if (Array.isArray(headers)) {
headers.forEach(({ name, value }) => {
this.headers[name] = value;
});
this.headers = {
...defaultHeaders,
...this.headers
};
} else {
this.headers = {
...defaultHeaders,
...headers
};
}
}
static formatResponse(response) {
let result;
try {
result = JSON.parse(response);
} catch (e) {
result = response;
}
return result;
}
static formatResponseText(request) {
let result;
try {
const parseRequest = request;
result = {
status: parseRequest.status,
error: parseRequest.status === 200 ? 0 : parseRequest.status,
Error: {
message: request.statusText
},
statusText: request.statusText
};
} catch (e) {
result = request;
}
return result;
}
static timeoutPromise(delay) {
return new Promise(_resolve => {
const ids = setTimeout(() => {
clearTimeout(ids);
// eslint-disable-next-line prefer-promise-reject-errors
_resolve({ type: 'timeout' });
}, delay);
});
}
requestSendByFetch(requestConfig, request) {
const { url, method = 'POST', params = {}, signal } = requestConfig;
const path = `/api/${url}`.replace(/\/\//g, '/');
let uri = `${this.host}${path}`.replace();
const myHeaders = process.env.RUNTIME_ENV === 'browser' ? new Headers() : new NodeHeaders();
let body = JSON.stringify(params);
if (method.toUpperCase() === 'GET' || method.toUpperCase() === 'DELETE') {
uri = Object.keys(params).length > 0 ? `${uri}?${stringify(params)}` : uri;
body = undefined;
}
Object.keys(this.headers).forEach(header => {
myHeaders.append(header, this.headers[header]);
});
return request(uri, {
...this.options,
method: method.toUpperCase(),
headers: myHeaders,
body,
signal
});
}
sendAsyncByFetch(requestConfig) {
const request = RequestLibrary;
const { timeout } = this;
const control = typeof AbortController === 'function' ? new AbortController() : {};
const config = { ...requestConfig, signal: control.signal, credentials: 'omit' };
// Simulation timeout
return Promise.race([this.requestSendByFetch(config, request), HttpProvider.timeoutPromise(timeout)]).then(
result =>
new Promise((resolve, reject) => {
// @deprecated unuse timeout=1
// if (timeout !== 1) {
try {
if (result.type === 'timeout') {
// Cancel timeout request
if (control.abort) control.abort();
reject(result);
} else {
result
.text()
.then(text => {
const res = HttpProvider.formatResponse(text);
if (result.status !== 200 || !result.ok) {
reject(res);
return;
}
resolve(res);
})
.catch(err => reject(err));
}
} catch (e) {
reject(e);
}
// }
})
);
}
requestSend(requestConfig, request, isAsync = false) {
const { url, method = 'POST', params = {} } = requestConfig;
const path = `/api/${url}`.replace(/\/\//g, '/');
let uri = `${this.host}${path}`.replace();
if (method.toUpperCase() === 'GET' || method.toUpperCase() === 'DELETE') {
uri = Object.keys(params).length > 0 ? `${uri}?${stringify(params)}` : uri;
}
request.open(method.toUpperCase(), uri, isAsync);
Object.keys(this.headers).forEach(header => {
request.setRequestHeader(header, this.headers[header]);
});
if (method.toUpperCase() === 'GET' || method.toUpperCase() === 'DELETE') {
request.send();
} else {
request.send(JSON.stringify(params));
}
}
send(requestConfig) {
let request;
if (isFetch) {
if (!RequestLibraryXMLOnly) {
// browser case, Chrome extension v3.
throw new Error("Can not get XMLHttpRequest, invalid parameter: 'sync'");
} else E{
request = new RequestLibraryXMLOnly();
}
} else {
request = new RequestLibrary();
}
request.withCredentials = false;
this.requestSend(requestConfig, request);
let result = request.responseText;
result = HttpProvider.formatResponse(result);
if (result.Error) {
throw result;
}
return result;
}
sendAsync(requestConfig) {
if (isFetch) return this.sendAsyncByFetch(requestConfig);
return this.sendAsyncByXMLHttp(requestConfig);
}
sendAsyncByXMLHttp(requestConfig) {
const request = RequestLibraryXMLOnly ? new RequestLibraryXMLOnly() : new RequestLibrary();
request.withCredentials = false;
request.timeout = this.timeout;
this.requestSend(requestConfig, request, true);
return new Promise((resolve, reject) => {
request.onreadystatechange = () => {
if (request.readyState === 4 && request.timeout !== 1) {
let result = request.responseText;
try {
result = HttpProvider.formatResponse(result);
if (request.status !== 200 || result.Error) {
reject(result);
} else {
resolve(result);
}
} catch (e) {
// todo: error handle
reject(e);
}
}
};
request.onerror = err => {
reject(err);
};
request.ontimeout = err => {
// todo: timeout error
reject(err);
};
});
}
isConnected() {
try {
this.send({
method: 'GET',
url: 'blockChain/chainStatus'
});
return true;
} catch (e) {
return false;
}
}
async isConnectedAsync() {
try {
return await this.sendAsyncByFetch({
method: 'GET',
url: 'blockChain/chainStatus'
});
} catch (e) {
return false;
}
}
}
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