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module.js
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module.js
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const sharedMemoryAddon = require("./build/Release/sharedMemory");
const messagingAddon = require("./build/Release/messaging");
const sharedMemoryNameMaxLength = 32;
const machMessageMaxContentLength = 4096;
const machSendTimedout = 0x10000004;
const machReceiveTimedout = 0x10004003;
function isBuffer(value) {
return (
value &&
value.buffer instanceof ArrayBuffer &&
value.byteLength !== undefined
);
}
function strEncodeUTF16(str) {
var buf = new ArrayBuffer(str.length * 2);
var bufView = new Uint16Array(buf);
for (var i = 0, strLen = str.length; i < strLen; i++) {
bufView[i] = str.charCodeAt(i);
}
return bufView;
}
function bufferFromData(data, encoding) {
if (isBuffer(data)) {
return data;
} else if (data && typeof data === "string") {
if (encoding === "utf16") {
return strEncodeUTF16(data);
} else {
return Buffer.from(data, encoding || "utf8");
}
}
return Buffer.from(data);
}
// shared memory
function createSharedMemory(name, fileMode, memorySize) {
if (name.length > sharedMemoryNameMaxLength) {
throw `shared memory name length cannot be greater than ${sharedMemoryNameMaxLength}`;
}
const handle = Buffer.alloc(sharedMemoryAddon.sizeof_SharedMemoryHandle);
const res = sharedMemoryAddon.CreateSharedMemory(
name,
fileMode,
memorySize,
handle
);
if (res !== 0) {
throw `could not create shared memory ${name}: ${res}`;
}
return handle;
}
function openSharedMemory(name, memorySize) {
if (name.length > sharedMemoryNameMaxLength) {
throw `shared memory name length cannot be greater than ${sharedMemoryNameMaxLength}`;
}
const handle = Buffer.alloc(sharedMemoryAddon.sizeof_SharedMemoryHandle);
const res = sharedMemoryAddon.OpenSharedMemory(name, memorySize, handle);
if (res !== 0) {
throw `could not open shared memory ${name}: ${res}`;
}
return handle;
}
function writeSharedData(handle, data, encoding) {
const buf = bufferFromData(data, encoding);
const res = sharedMemoryAddon.WriteSharedData(handle, buf, buf.byteLength);
if (res === -1) {
throw `data size (${data.length()}) exceeded maximum shared memory size`;
}
}
function readSharedData(handle, encoding, bufferSize) {
const dataSize = bufferSize || sharedMemoryAddon.GetSharedMemorySize(handle);
const buf = Buffer.alloc(dataSize);
const res = sharedMemoryAddon.ReadSharedData(handle, buf, dataSize);
if (res === -1) {
throw `data size (${data.length()}) exceeded maximum shared memory size`;
}
if (encoding) {
// is a string
return buf.toString(encoding).replace(/\0/g, ""); // remove trailing \0 characters
}
return buf;
}
function closeSharedMemory(handle) {
sharedMemoryAddon.CloseSharedMemory(handle);
}
// messaging
function initializeMachPortSender(bootstrapPortName) {
const handle = Buffer.alloc(messagingAddon.sizeof_MachPortHandle);
const res = messagingAddon.InitializeMachPortSender(
bootstrapPortName,
handle
);
if (res !== 0) {
throw `could not initialize mach port sender ${bootstrapPortName}: ${res}`;
}
return handle;
}
function initializeMachPortReceiver(bootstrapPortName) {
const handle = Buffer.alloc(messagingAddon.sizeof_MachPortHandle);
const res = messagingAddon.InitializeMachPortReceiver(
bootstrapPortName,
handle
);
if (res !== 0) {
throw `could not initialize mach port receiver ${bootstrapPortName}: ${res}`;
}
return handle;
}
function sendMachPortMessage(handle, msgType, data, encoding, timeout) {
const buf = bufferFromData(data, encoding);
const res = messagingAddon.SendMachPortMessage(
handle,
msgType,
buf,
buf.byteLength,
timeout || 0
);
if (res === -1) {
throw `data size (${data.length()}) exceeded maximum msg content size (${machMessageMaxContentLength})`;
} else if (res === machSendTimedout) {
throw "timeout";
} else if (res !== 0) {
throw `could not send mach port message: ${res}`;
}
}
function waitMachPortMessage(handle, encoding, timeout) {
const buf = Buffer.alloc(machMessageMaxContentLength);
const msgTypeHandle = Buffer.alloc(messagingAddon.sizeof_MsgTypeHandle);
const res = messagingAddon.WaitMachPortMessage(
handle,
msgTypeHandle,
buf,
machMessageMaxContentLength,
timeout || 0
);
if (res === -1) {
throw `data buffer size is less than maximum content size (${machMessageMaxContentLength})`;
} else if (res === machReceiveTimedout) {
throw "timeout";
} else if (res !== 0) {
throw `could not wait mach port message: ${res}`;
}
return {
msgType: msgTypeHandle[0].valueOf(),
content: encoding
? buf.toString(encoding).replace(/\0/g, "") // is a string, remove trailing \0 characters
: buf,
};
}
function closeMachPort(handle) {
const res = messagingAddon.CloseMachPort(handle);
if (res !== 0) {
throw `could not close mach port: ${res}`;
}
}
module.exports = {
createSharedMemory,
openSharedMemory,
writeSharedData,
readSharedData,
closeSharedMemory,
initializeMachPortSender,
initializeMachPortReceiver,
sendMachPortMessage,
waitMachPortMessage,
closeMachPort,
sharedMemoryFileMode: {
S_IRWXU: 0000700 /* [XSI] RWX mask for owner */,
S_IRUSR: 0000400 /* [XSI] R for owner */,
S_IWUSR: 0000200 /* [XSI] W for owner */,
S_IXUSR: 0000100 /* [XSI] X for owner */,
/* Read, write, execute/search by group */
S_IRWXG: 0000070 /* [XSI] RWX mask for group */,
S_IRGRP: 0000040 /* [XSI] R for group */,
S_IWGRP: 0000020 /* [XSI] W for group */,
S_IXGRP: 0000010 /* [XSI] X for group */,
/* Read, write, execute/search by others */
S_IRWXO: 0000007 /* [XSI] RWX mask for other */,
S_IROTH: 0000004 /* [XSI] R for other */,
S_IWOTH: 0000002 /* [XSI] W for other */,
S_IXOTH: 0000001 /* [XSI] X for other */,
S_ISUID: 0004000 /* [XSI] set user id on execution */,
S_ISGID: 0002000 /* [XSI] set group id on execution */,
S_ISVTX: 0001000 /* [XSI] directory restrcted delete */,
},
};