← Hacker News + Node integrations

Run Node Code with Node API on New Comments by Keyword from Hacker News API

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New Comments by Keyword from the Hacker News API
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Run Node Code with the Node API
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Getting Started

This integration creates a workflow with a Hacker News trigger and Node action. When you configure and deploy the workflow, it will run on Pipedream's servers 24x7 for free.

  1. Select this integration
  2. Configure the New Comments by Keyword trigger
    1. Connect your Hacker News account
    2. Configure timer
    3. Optional- Configure Keyword
  3. Configure the Run Node Code action
    1. Connect your Node account
  4. Deploy the workflow
  5. Send a test event to validate your setup
  6. Turn on the trigger

Details

This integration uses pre-built, open source components from Pipedream's GitHub repo. These components are developed by Pipedream and the community, and verified and maintained by Pipedream.

To contribute an update to an existing component or create a new component, create a PR on GitHub. If you're new to Pipedream component development, you can start with quickstarts for trigger span and action development, and then review the component API reference.

Trigger

Description:Emit new comments that mention a specific keyword
Version:0.0.4
Key:hacker_news-new-comments-by-keyword

Trigger Code

const Parser = require("rss-parser");
const { DEFAULT_POLLING_SOURCE_TIMER_INTERVAL } = require("@pipedream/platform");
const hacker_news = require("../../hacker_news.app.js");

const parser = new Parser();

module.exports = {
  key: "hacker_news-new-comments-by-keyword",
  name: "New Comments by Keyword",
  description: "Emit new comments that mention a specific keyword",
  app: "hacker_news",
  version: "0.0.4",
  type: "source",
  props: {
    hacker_news,
    timer: {
      type: "$.interface.timer",
      default: {
        intervalSeconds: DEFAULT_POLLING_SOURCE_TIMER_INTERVAL,
      },
    },
    db: "$.service.db",
    // If you want a single search feed but multiple keywords, separate the keywords with " OR ":
    keyword: {
      type: "string",
      label: "Keyword",
      description: "Keyword to watch. Matches comments. Leave blank to get all comments.",
      optional: true,
      default: "",
    },
  },
  methods: {
    // in theory if alternate setting title and description or aren't unique this won't work
    itemKey(item) {
      return item.guid || item.id || item.title || item.description;
    },
  },
  async run() {
    const seenKeys = this.db.get("seenKeys") || [];
    const seenKeysMap = seenKeys.reduce((acc, v) => {
      acc[v] = true;
      return acc;
    }, {});
    // All elements of an item are optional,
    // however at least one of title or description must be present.
    // should be listed from most recent to least recent
    const feed = await parser.parseURL(`https://hnrss.org/newcomments?q=${encodeURIComponent(this.keyword)}`);
    for (let idx = feed.items.length - 1; idx >= 0; idx--) {
      const item = feed.items[idx];
      const key = this.itemKey(item);
      // XXX throw if !key?
      if (seenKeysMap[key]) continue;
      seenKeys.unshift(key);
      seenKeysMap[key] = true; // just in case of dupes
      this.$emit(item, {
        id: this.itemKey(item),
        summary: item.title,
        ts: item.pubdate && +new Date(item.pubdate),
      });
    }
    if (seenKeys.length) {
      // XXX restrict by byte size instead of el size
      this.db.set("seenKeys", seenKeys.slice(0, 1000));
    }
  },
};

Trigger Configuration

This component may be configured based on the props defined in the component code. Pipedream automatically prompts for input values in the UI and CLI.
LabelPropTypeDescription
Hacker Newshacker_newsappThis component uses the Hacker News app.
timer$.interface.timer
N/Adb$.service.dbThis component uses $.service.db to maintain state between component invocations.
Keywordkeywordstring

Keyword to watch. Matches comments. Leave blank to get all comments.

Trigger Authentication

The Hacker News API does not require authentication.

About Hacker News

Social news website

Action

Description:Write custom Node.js code and use any of the 400k+ npm packages available. Refer to the [Pipedream Node docs](https://pipedream.com/docs/code/nodejs) to learn more.
Version:0.0.2
Key:node-run-node-code

Action Code

import node from "../../node.app.mjs";

export default {
  name: "Run Node Code",
  version: "0.0.2",
  key: "node-run-node-code",
  description: "Write custom Node.js code and use any of the 400k+ npm packages available. Refer to the [Pipedream Node docs](https://pipedream.com/docs/code/nodejs) to learn more.",
  props: {
    node,
  },
  type: "action",
  methods: {},
  async run({
    steps, $,
  }) {
    // Return data to use it in future steps
    return steps.trigger.event;
  },
};

Action Configuration

This component may be configured based on the props defined in the component code. Pipedream automatically prompts for input values in the UI.

LabelPropTypeDescription
NodenodeappThis component uses the Node app.

Action Authentication

The Node API does not require authentication.

About Node

Anything you can do with Node.js, you can do in a Pipedream workflow. This includes using most of npm's 400,000+ packages.

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