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reduce memory footprint by reusing object instances

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Signed-off-by: Travis Glenn Hansen <travisghansen@yahoo.com>
This commit is contained in:
Travis Glenn Hansen
2022-04-06 11:14:39 -06:00
parent 1783aebb75
commit 1f2c8cf58d
19 changed files with 412 additions and 229 deletions
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src/utils/mount.js
+19 -10
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@@ -2,7 +2,7 @@ const cp = require("child_process");
const { Filesystem } = require("../utils/filesystem");
// avoid using avail,size,used as it causes hangs when the fs is stale
FINDMNT_COMMON_OPTIONS = [
const FINDMNT_COMMON_OPTIONS = [
"--output",
"source,target,fstype,label,options",
"-b",
@@ -43,6 +43,14 @@ class Mount {
spawn: cp.spawn,
};
}
if (!options.filesystem) {
options.filesystem = new Filesystem();
}
}
async getFilesystemInstance() {
return this.options.filesystem;
}
/**
@@ -51,12 +59,12 @@ class Mount {
* @param {*} device
*/
async deviceIsMounted(device) {
const filesystem = new Filesystem();
const mount = this;
const filesystem = await mount.getFilesystemInstance();
if (device.startsWith("/")) {
device = await filesystem.realpath(device);
}
const mount = this;
let args = [];
args = args.concat(["--source", device]);
args = args.concat(FINDMNT_COMMON_OPTIONS);
@@ -114,12 +122,12 @@ class Mount {
* @param {*} device
*/
async deviceIsMountedAtPath(device, path) {
const filesystem = new Filesystem();
const mount = this;
const filesystem = await mount.getFilesystemInstance();
if (device.startsWith("/") && !device.startsWith("//")) {
device = await filesystem.realpath(device);
}
const mount = this;
let args = [];
args = args.concat(["--source", device]);
args = args.concat(["--mountpoint", path]);
@@ -282,8 +290,8 @@ class Mount {
* @param {*} path
*/
async isBindMountedBlockDevice(path) {
const filesystem = new Filesystem();
const mount = this;
const filesystem = await mount.getFilesystemInstance();
const is_mounted = await mount.pathIsMounted(path);
if (!is_mounted) {
@@ -385,9 +393,6 @@ class Mount {
const mount = this;
args = args || [];
let stdout = "";
let stderr = "";
if (mount.options.sudo) {
args.unshift(command);
command = mount.options.paths.sudo;
@@ -402,9 +407,13 @@ class Mount {
);
console.log("executing mount command: %s", cleansedLog);
const child = mount.options.executor.spawn(command, args, options);
return new Promise((resolve, reject) => {
const child = mount.options.executor.spawn(command, args, options);
let stdout = "";
let stderr = "";
child.stdout.on("data", function (data) {
stdout = stdout + data;
});