--- title: Crawling GITHUB with Promises - ArangoDB description: The new Javascript driver no longer imposes any promises implementation. It follows the standard callback pattern with a callback using err and res. I wanted to give the new driver a try. A github crawler seemed like a good side-project, especially because the node-github driver follows the same conventions as the Javascript driver. There are… --- ArangoDB 3.12 Product Release Announcement! Read the blog for details. 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[Recommendations](https://arangodb.com/solutions/use-cases/recommendations/) - [Case Management](https://arangodb.com/solutions/use-cases/case-management/) - [Geospatial Analysis](https://arangodb.com/solutions/use-cases/geospatial/) - [Master Data Mgmt](https://arangodb.com/solutions/use-cases/master-data-management/) - Industries - [Software & Technology](https://arangodb.com/arangodb-for-software-tech/) - [Financial Services](https://arangodb.com/arangodb-for-financial-services/) - [Tele Communication](https://arangodb.com/telecommunications-and-network/) - [E-commerce](https://arangodb.com/arangodb-for-e-commerce/) - [Healthcare](https://arangodb.com/arangodb-for-healthcare/) - [Government](https://arangodb.com/arangodb-for-government/) - [Aerospace & Defence](https://arangodb.com/arangodb-for-aerospace-defense/) - [Manufacturing](https://arangodb.com/arangodb-for-manufacturing/) - Solution Accelerators - [Enterprise Knowledge Graphs](https://arangodb.com/resources/white-papers/enterprise-knowledge-graphs/) - [Entity Resolution](https://arangodb.com/entity-resolution/) - [Traceability/Lineage](https://arangodb.com/traceability-and-lineage/) - [Contexual Relevance](https://arangodb.com/contextual-relevance/) - Customers - [All Case Studies](https://arangodb.com/solutions/solutions-customers/#all) - [Government & Cyber](https://arangodb.com/solutions/solutions-customers/#Government-Cyber) - [Manufacturing & Supply Chain](https://arangodb.com/solutions/solutions-customers/#Manufacturing-Supply-Chain) - [Healthcare & Science](https://arangodb.com/solutions/solutions-customers/#Healthcare-Science) - [Retail & Commerce](https://arangodb.com/solutions/solutions-customers/#Retail-Commerce) - [Technology](https://arangodb.com/solutions/solutions-customers/#Technology) - [Education](https://arangodb.com/solutions/solutions-customers/#Education) - [Telco](https://arangodb.com/solutions/solutions-customers/#Telco) - [Financial Services](https://arangodb.com/solutions/solutions-customers/#Financial-Services) - Learn - [Documentation](https://docs.arangodb.com/stable/) - [Developer Hub](https://developer.arangodb.com/) - [ArangoDB University](https://university.arangodb.com/) - [Blog](https://arangodb.com/blog/) - [Certification](https://arangodb.com/learn/certification/) - [Community](https://arangodb.com/community/) - [Events](https://arangodb.com/events/) - [Resources](https://arangodb.com/resources/) - [Training Center](https://arangodb.com/learn/) - Company - [About Us](https://arangodb.com/about-us/) - [Team](https://arangodb.com/about-arangodb/) - [Partners](https://arangodb.com/partners/) - [News](https://arangodb.com/news/) - [Careers](https://arangodb.applytojob.com/apply) - [Pricing](https://arangodb.com/download-major/pricing/) [**Start Free** ArangoGraph Cloud](https://dashboard.arangodb.cloud/signup?acceptedTermsAndConditions=1) [**Download Now** ArangoDB Enterprise](https://arangodb.com/download-arangodb-enterprise/) ![Vector-5](https://blog.arangodb.com/hubfs/Imported_Blog_Media/search.svg) # Crawling GITHUB with Promises January 06, 2015 Tags: [Foxx](https://blog.arangodb.com/blog/topic/foxx), [driver](https://blog.arangodb.com/blog/topic/driver), [API](https://blog.arangodb.com/blog/topic/api), [nodejs](https://blog.arangodb.com/blog/topic/nodejs), [Javascript](https://blog.arangodb.com/blog/topic/javascript) [Twitter](https://twitter.com/intent/tweet?url=https://blog.arangodb.com/blog/2015/01/crawling-github-promises) [LinkedIn](http://www.linkedin.com/shareArticle?mini=true&url=https://blog.arangodb.com/blog/2015/01/crawling-github-promises) [Reddit](https://www.reddit.com/share?url=https://blog.arangodb.com/blog/2015/01/crawling-github-promises) [Yahoo](https://plus.google.com/share?url=https://blog.arangodb.com/blog/2015/01/crawling-github-promises%3Futm_medium%3Dsocial%26utm_source%3Dgoogle_plus) ![](https://blog.arangodb.com/hubfs/ArangoDB-Blog/clock.svg)Estimated reading time: 3 minutes The new Javascript [driver](https://github.com/arangodb/arangojs) no longer imposes any promises implementation. It follows the standard callback pattern with a callback using `err` and `res`. I wanted to give the new driver a try. A **github crawler** seemed like a good side-project, especially because the node-github driver follows the same conventions as the Javascript driver. There are a lot of promise libraries out there. The most popular one – according to NPM – was [promises](https://www.npmjs.com/package/promises). It should be possible to use any implementation. Therefore I used this one. The following source code can be found on [github](https://github.com/arangodb/arangodb/). ### Pagination with Promises made easy The github driver has a function to get all followers. However, the result is paginated. With two helper functions and promises it is straight forward to implement a function to retrieve all followers of an user. ``` function extractFollowers (name) { 'use strict'; return new Promise(function(resolve, reject) { github.user.getFollowers({ user: name }, promoteError(reject, function(res) { followPages(resolve, reject, [], res); })); }); } ``` The `followPages` function simply extends the result with the next page until the last page is reached. ``` function followPages (resolve, reject, result, res) { 'use strict'; var i; for (i = 0; i < res.length; ++i) { result.push(res[i]); } if (github.hasNextPage(res)) { github.getNextPage(res, promoteError(reject, function(res) { followPages(resolve, reject, result, res); })); } else { resolve(result); } } ``` The promote error helper is a convenience function to bridge callbacks and promises. ``` function promoteError (reject, resolve) { 'use strict'; return function(err, res) { if (err) { if (err.hasOwnProperty("message") && /rate limit exceeded/.test(err.message)) { rateLimitExceeded = true; } console.error("caught error: %s", err); reject(err); } else { resolve(res); } }; } ``` I’ve decided to stick to the sequence `reject` (aka `err`) followed by `resolve` (aka `res`) – like the callbacks. The `promoteError` can be used for the github callback as well as the ArangoDB driver. ### Queues, Queues, Queues I’ve only needed a very simple job queue, so queue-it is a good choice. It provides a very simple API for handling job queues: ``` POST /queue/job POST /queue/worker DELETE /queue/job/:key ``` The new Javascript driver allows to access arbitrary endpoint. First install a Foxx implementing the queue microservice in an ArangoDB instance. ``` foxx-manager install queue-it /queue ``` Adding a new job from node.js is now easy ``` function addJob (data) { 'use strict'; return new Promise(function(resolve, reject) { db.endpoint("queue").post("job", data, promoteError(reject, resolve)); }); } ``` ### Transaction I wanted to crawl users and their repos. The relations (“follows”, “owns”, “is\_member”, “stars”) is stored in an edge collection. I only add an edge if it is not already there. Therefore I check inside a transaction, if the edge exists and add it, if it does not. ``` createRepoDummy(repo.full_name, data).then(function(dummyData) { return db.transaction( "relations", String(function(params) { var me = params[0]; var you = params[1]; var type = params[2]; var db = require("org/arangodb").db; if (db.relations.firstExample({ _from: me, _to: you, type: type }) === null) { db.relations.save(me, you, { type: type }); } }), [ meId, "repos/" + data._key, type ], function(err) { if (err) { throw err; } return handleDummy(dummyData); }); }) ``` Please note that the action function is executed on the server and not in the nodejs client. Therefore we need to pass the relevant data as parameters. It is not possible to use the closure variables. ### Riding the Beast Start an ArangoDB instance (i.e. inside a [docker container](https://www.arangodb.com/docs/stable/deployment-docker.html)) and install the simple queue. ``` foxx-manager install queue-it /queue ``` Start the arangosh and create collections `users`, `repos` and `relations`. ``` arangosh> db._create("users"); arangosh> db.users.ensureHashIndex("name"); arangosh> db._create("repos"); arangosh> db.repos.ensureHashIndex("name"); arangosh> db._createEdgeCollection("relations"); ``` Now everything is initialized. Fire up nodejs and start crawling. ``` node> var crawler = require("./crawler"); node> crawler.github.authenticate({ type: "basic", username: "username", password: "password" }) node> crawler.addJob({ type:"user", identifier:"username" }) node> crawler.runJobs(); ``` Please keep in mind that this is just an experiment. There is no good error handling and convenience functions for setup and start. It is also not optimized for performance. For instance, it would easily be possible to avoid nodejs / ArangoDB roundtrips using more transactions. **Sources used in this example:** - ArangoJS [https://github.com/arangodb/arangojs](https://github.com/arangodb/arangojs) - Node Github https://github.com/ajaxorg/node-github - npm promises [https://www.npmjs.com/package/promises](https://www.npmjs.com/package/promises) - ArangoDB Foxx queue-it https://github.com/arangodb/queue-it The source code of this example is available from Github: [https://github.com/fceller/Foxxmender](https://github.com/arangodb/arangodb/) If you want to continue with other JavaScript related resources, you should start with [ArangoDB NoSQL and JavaScript](https://www.arangodb.com/arangodb-drivers/). [Twitter](https://twitter.com/intent/tweet?url=https://blog.arangodb.com/blog/2015/01/crawling-github-promises) [LinkedIn](http://www.linkedin.com/shareArticle?mini=true&url=https://blog.arangodb.com/blog/2015/01/crawling-github-promises) [Reddit](https://www.reddit.com/share?url=https://blog.arangodb.com/blog/2015/01/crawling-github-promises) [Yahoo](https://plus.google.com/share?url=https://blog.arangodb.com/blog/2015/01/crawling-github-promises%3Futm_medium%3Dsocial%26utm_source%3Dgoogle_plus) ![Picture of Frank Celler](https://blog.arangodb.com/hubfs/Imported_Blog_Media/Authors/Author-avatar.png) January 06, 2015 , [Frank Celler](https://blog.arangodb.com/blog/author/frank-celler) Frank is both entrepreneur and backend developer, developing mostly memory databases for two decades. He is the CTO and co-founder of ArangoDB. Try to challenge Frank asking him questions on C, C++ and MRuby. 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