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56 lines
2.2 KiB
JavaScript
56 lines
2.2 KiB
JavaScript
8 months ago
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"use strict";
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var __importDefault = (this && this.__importDefault) || function (mod) {
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return (mod && mod.__esModule) ? mod : { "default": mod };
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.unixRead = void 0;
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const util_1 = require("util");
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const fs_1 = require("fs");
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const errors_1 = require("./errors");
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const debug_1 = __importDefault(require("debug"));
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const logger = (0, debug_1.default)('serialport/bindings-cpp/unixRead');
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const readAsync = (0, util_1.promisify)(fs_1.read);
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const readable = (binding) => {
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return new Promise((resolve, reject) => {
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if (!binding.poller) {
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throw new Error('No poller on bindings');
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}
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binding.poller.once('readable', err => (err ? reject(err) : resolve()));
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});
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};
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const unixRead = async ({ binding, buffer, offset, length, fsReadAsync = readAsync, }) => {
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logger('Starting read');
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if (!binding.isOpen || !binding.fd) {
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throw new errors_1.BindingsError('Port is not open', { canceled: true });
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}
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try {
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const { bytesRead } = await fsReadAsync(binding.fd, buffer, offset, length, null);
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if (bytesRead === 0) {
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return (0, exports.unixRead)({ binding, buffer, offset, length, fsReadAsync });
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}
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logger('Finished read', bytesRead, 'bytes');
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return { bytesRead, buffer };
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}
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catch (err) {
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logger('read error', err);
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if (err.code === 'EAGAIN' || err.code === 'EWOULDBLOCK' || err.code === 'EINTR') {
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if (!binding.isOpen) {
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throw new errors_1.BindingsError('Port is not open', { canceled: true });
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}
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logger('waiting for readable because of code:', err.code);
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await readable(binding);
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return (0, exports.unixRead)({ binding, buffer, offset, length, fsReadAsync });
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}
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const disconnectError = err.code === 'EBADF' || // Bad file number means we got closed
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err.code === 'ENXIO' || // No such device or address probably usb disconnect
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err.code === 'UNKNOWN' ||
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err.errno === -1; // generic error
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if (disconnectError) {
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err.disconnect = true;
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logger('disconnecting', err);
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}
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throw err;
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}
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};
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exports.unixRead = unixRead;
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