本文整理匯總了TypeScript中dns.lookup函數的典型用法代碼示例。如果您正苦於以下問題：TypeScript lookup函數的具體用法？TypeScript lookup怎麽用？TypeScript lookup使用的例子？那麽, 這裏精選的函數代碼示例或許可以為您提供幫助。
在下文中一共展示了lookup函數的7個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的TypeScript代碼示例。
示例1: reject
new Promise<string>((fulfill, reject) => {
dns.lookup(hostname, 4, (e, address) => {
if (e) {
return reject(new errors.ServerUnreachable('could not resolve proxy server hostname'));
}
fulfill(address);
});
}),示例2: fqdn
function fqdn(callback: (err: Error | null, fqdn?: string) => void) {
const uqdn = os.hostname();
dns.lookup(uqdn, { hints: dns.ADDRCONFIG }, (err1: Error | null, ip: string) => {
if (err1) {
return callback(err1);
}
dns.lookupService(ip, 0, (err2: Error | null, _fqdn: string) => {
if (err2) {
return callback(err2);
}
_fqdn = _fqdn.replace(".localdomain", "");
callback(null, _fqdn);
});
});
}示例3:
namespace net_tests {
{
// Make sure .listen() and .close() retuern a Server instance
net.createServer().listen(0).close().address();
}
}
///////////////////////////////////////////////////
/// DNS Tests : https://nodejs.org/api/dns.html ///
///////////////////////////////////////////////////
namespace dns_tests {
dns.lookup("nodejs.org", (err, address, family) => {
const _err: NodeJS.ErrnoException = err;
const _address: string = address;
const _family: number = family;
});
dns.lookup("nodejs.org", 4, (err, address, family) => {
const _err: NodeJS.ErrnoException = err;
const _address: string = address;
const _family: number = family;
});
dns.lookup("nodejs.org", 6, (err, address, family) => {
const _err: NodeJS.ErrnoException = err;
const _address: string = address;
const _family: number = family;
});
dns.lookup("nodejs.org", {}, (err, address, family) => {
const _err: NodeJS.ErrnoException = err;
const _address: string = address;示例4: lookup
export const networkEnabled: Promise<boolean> = new Promise<boolean>((r, j) => {
lookup("8.8.8.8", 4, (err, address, family) => {
r(err ? false : true);
});
});示例5: Promise
return new Promise(resolve => {
dns.lookup('registry.yarnpkg.com', err => {
resolve(err === null)
})
})示例6: getRelayCell
/**
* Returns a cell of type RELAY. Appropriate body members can be stored in "extras", where they will be safely added to the cell.
* @param {number} the circuit ID
* @param {number} the stream ID
* @param {number} the digest
* @param {RelayCommand} the relay command
* @param {any} extras - a JSON object containing anything to be put in
* the body. The valid keys for this object are "host", "agentID", and
* "data".
* @param {Function} callback
*/
public getRelayCell(circuitID : number, streamID : number, cmd : RelayCommand, extras : any, callback : Function) {
var buf : Buffer = new Buffer(Constant.CELL_SIZE);
buf.writeUInt16BE(circuitID, 0);
buf.writeUInt8(CellType.RELAY, 2);
buf.writeUInt16BE(streamID, 3);
buf.writeUInt16BE(0, 5);
buf.writeUInt32BE(0, 7);
buf.writeUInt8(cmd, 13);
// process the aditional parameters
switch (cmd) {
case RelayCommand.BEGIN:
var host : string = extras["host"];
if (typeof(host) == "undefined" || host.indexOf(':') == -1) {
this.aEmit('error', ErrorType.CELL_FORMAT, "RELAY->BEGIN cell creation: host is undefined");
callback(null);
return;
}
var hostname = host.split(':')[0];
var port = host.split(':')[1];
if (!this.checkIsIP(hostname)) {
dns.lookup(hostname, 4, ((err, address) => {
var finalAddress = address + ':' + port;
buf.writeUInt16BE(finalAddress.length + 1, 11);
buf.write(finalAddress, Constant.RELAY_HEADER_SIZE, finalAddress.length, 'ascii');
// write the null terminator
buf.writeUInt8(0, Constant.RELAY_HEADER_SIZE + finalAddress.length);
callback(buf);
}));
return;
} else {
var finalAddress = host;
buf.writeUInt16BE(finalAddress.length + 1, 11);
buf.write(finalAddress, Constant.RELAY_HEADER_SIZE, finalAddress.length, 'ascii');
// write the null terminator
buf.writeUInt8(0, Constant.RELAY_HEADER_SIZE + finalAddress.length);
}
break;
case RelayCommand.DATA:
var data : Buffer = extras["data"];
if (typeof(data) == "undefined") {
this.aEmit('error', ErrorType.CELL_FORMAT, "RELAY->DATA cell creation: Data is undefined");
callback(null);
return;
} else if (data.length > Constant.CELL_SIZE - Constant.RELAY_HEADER_SIZE) {
this.aEmit('error', ErrorType.CELL_SIZE, "RELAY->DATA cell creation: Data too long for cell");
callback(null);
return;
}
buf.writeUInt16BE(data.length, 11);
data.copy(buf, Constant.RELAY_HEADER_SIZE, 0, data.length);
break;
case RelayCommand.EXTEND:
var host : string = extras["host"];
var agentID : number = extras["agentID"];
if (typeof(host) == "undefined") {
this.aEmit('error', ErrorType.CELL_FORMAT, "RELAY->EXTEND cell creation: host is undefined");
callback(null);
return;
} else if (typeof(agentID) == "undefined") {
this.aEmit('error', ErrorType.CELL_FORMAT, "RELAY->EXTEND cell creation: agentID is undefined");
callback(null);
return;
}
buf.write(host, Constant.RELAY_HEADER_SIZE, host.length, 'ascii');
buf.writeUInt8(0, Constant.RELAY_HEADER_SIZE + host.length);
buf.writeUInt32BE(agentID, Constant.RELAY_HEADER_SIZE + host.length + 1);
buf.writeUInt16BE(host.length + 5, 11);
break;
default:
buf.writeUInt16BE(0, 11);
break;
}
callback(buf);
}示例7: lookup
return new Promise<string>((resolve, error) => {
lookup(hostname(), (err, add, fam) => {
resolve(add);
});
});