import { createHash } from "crypto";
import app from "../../sftp.app.mjs";
import { DEFAULT_POLLING_SOURCE_TIMER_INTERVAL } from "@pipedream/platform";
export default {
key: "sftp-watch-remote-directory",
name: "New Remote Directory Watcher",
description: "Emit new events when files get created, changed or deleted from a remote directory. [See the docs](https://github.com/theophilusx/ssh2-sftp-client#orgfac43d1)",
version: "0.1.1",
type: "source",
dedupe: "unique",
props: {
app,
timer: {
type: "$.interface.timer",
default: {
intervalSeconds: DEFAULT_POLLING_SOURCE_TIMER_INTERVAL,
},
},
db: "$.service.db",
rootDirectory: {
label: "Root directory",
description: "Root directory to be watched. example: `/public`",
type: "string",
default: "/",
},
maxDepth: {
label: "Maximum watcher depth",
description: "Watch all subdirectories within of the root directory, considering the selected maximum depth.",
type: "integer",
min: 0,
},
},
methods: {
setFiles(files) {
this.db.set("files", files);
},
getFiles() {
return this.db.get("files") || [];
},
getChangesWithEvent(currentFiles, previousFiles) {
const fileChanges = [];
for (const prvFile of previousFiles) {
const file = currentFiles.find((p) => p.path === prvFile.path);
if (!file) {
fileChanges.push({
...prvFile,
event: "deleted",
});
}
}
for (const file of currentFiles) {
const prvFile = previousFiles.find((p) => p.path === file.path);
if (prvFile) {
if (prvFile.size === file.size && prvFile.modifyTime === file.modifyTime) {
continue;
}
fileChanges.push({
...file,
event: "updated",
});
} else {
fileChanges.push({
...file,
event: "created",
});
}
}
return fileChanges;
},
async listDirectories(sftp, parent, currDepth) {
const files = await sftp.list(parent);
return files.filter((file) => file.type === "d")
.map((directory) => ({
...directory,
parent,
path: `${parent}/${directory.name}`,
depth: currDepth,
}));
},
async listDirectoriesDeep(sftp, parent, maxDepth, currDepth) {
if (currDepth > maxDepth) {
return [];
}
const nextDepth = currDepth + 1;
const rootDirectories = await this.listDirectories(sftp, parent, currDepth);
const childrenDirectories = [];
for (const item of rootDirectories) {
const path = `${parent}/${item.name}`;
const directories = await this.listDirectoriesDeep(sftp, path, maxDepth, nextDepth);
childrenDirectories.push(...directories);
}
rootDirectories.push(...childrenDirectories);
return rootDirectories;
},
async listAllFilesFromDirectories(sftp, directories) {
const allFiles = [];
for (const directory of directories) {
const listingResult = await sftp.list(directory.path);
const files = listingResult.filter((file) => file.type !== "d")
.map((file) => ({
...file,
directory: directory.path,
path: `${directory.path}/${file.name}`,
depth: directory.depth || 0,
}));
allFiles.push(...files);
}
return allFiles;
},
validateRootDirectory(rootDirectory) {
if (!rootDirectory) {
throw new Error("Must provide root directory");
}
if (!rootDirectory.startsWith("/")) {
throw new Error("The root directory must to be the absolute path and start with a slash, such as: '/public'");
}
},
getEventId(event) {
return createHash("md5")
.update(event.path + event.modifyTime)
.digest("hex");
},
emitEvents(events) {
events.sort((a, b) => a.modifyTime - b.modifyTime);
for (const fileChangeEvent of events) {
this.$emit(fileChangeEvent, {
id: this.getEventId(fileChangeEvent),
summary: `${fileChangeEvent.event} ${fileChangeEvent.path}`,
ts: new Date(fileChangeEvent.modifyTime),
});
}
},
},
async run() {
this.validateRootDirectory(this.rootDirectory);
const sftp = await this.app.connect();
let directories = [
{
path: this.rootDirectory,
},
];
directories = directories.concat(
await this.listDirectoriesDeep(sftp, this.rootDirectory, this.maxDepth, 0),
);
const currentFiles = await this.listAllFilesFromDirectories(sftp, directories);
const previousFiles = this.getFiles();
const filesChangesWithEvent = this.getChangesWithEvent(currentFiles, previousFiles);
this.emitEvents(filesChangesWithEvent);
this.setFiles(currentFiles);
await this.app.disconnect(sftp);
},
};
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