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DocSearch - Configurations

Home Page:https://community.algolia.com/docsearch/

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DocSearch configurations

This is the repository hosting the public DocSearch configurations.

Configuration format

The configuration files can be found here https://github.com/algolia/docsearch-configs

A configuration file should look like:

{
    "index_name": "stripe",
    "start_urls": [
        "https://stripe.com/docs"
    ],
    "stop_urls": [
        "https://stripe.com/docs/api"
    ],
    "selectors_exclude": [
        ".method-list",
        "aside.note"
    ],
    "selectors": {
      "lvl0": "#content header h1",
      "lvl1": "#content article h1",
      "lvl2": "#content section h3",
      "lvl3": "#content section h4",
      "lvl4": "#content section h5",
      "lvl5": "#content section h6",
      "text": "#content header p,#content section p,#content section ol"
    }
}

index_name

Mandatory

Name of the Algolia index where all the data will be pushed. If the PREFIX environment variable is defined, it will be prefixed with it.

start_urls

Mandatory

You can pass either a string or an array of urls. The crawler will go to each page in order, following every link it finds on the page. It will only stop if the domain is outside of the allowed_domains or if the link is blacklisted in stop_urls. Strings will be considered as regex.

Note that it currently does not follow 301 redirects.

selectors

Mandatory

This object contains all the CSS selectors that will be used to create the record hierarchy. It contains 6 levels (lvl0, lvl1, lvl2, lvl3, lvl4, lvl5) and text. You should fill at least the three first levels for better relevance.

A default config would be to target the page title or h1 as lvl0, the h2 as lvl1 and h3 as lvl2. text is usually any p of text.

Global selectors

It's possible to make a selector global which mean that all records for the page will have this value. This is useful when you have a title that in right sidebar because the sidebar is after the content on dom.

"selectors": {
  "lvl0": {
    "selector": "#content header h1",
    "global": true
  }
}

Xpath selector

By default selector are considered css selectors but you can specify that a selector is an xpath one. This is useful when you want to do more complex selection like selecting the parent of a node.

"selectors": {
  "lvl0": {
    "selector": "//li[@class=\"chapter active done\"]/../../a",
    "type": "xpath"
  }
}

Default value

You have the possibility to add a default value. If the given selector doesn't match anything in a page then for each record the default value will be set

"selectors": {
  "lvl0": {
    "selector": "#content article h1",
    "default_value": "Documentation"
  }
}

Strip Chars

You can override the default strip_chars per level

"selectors": {
  "lvl0": {
    "selector": "#content article h1",
    "strip_chars": " .,;:"
  }
}

allowed_domains

You can pass either a string or an array of strings. This is the whitelist of domains the crawler will scan. If a link targets a page that is not in the whitelist, the crawler will not follow it.

Default is the domain of the first element in the start_urls

stop_urls

This is the blacklist of urls on which the crawler should stop. If a link in a crawled webpage targets one the elements in the stop_urls list, the crawler will not follow the link.

Note that you can use regexps as well as plain urls.

Note: It is sometimes needed to add http://www.example.com/index.html pages to the stop_urls list if you set http://www.example.com as a start_urls, to avoid duplicated content.

selectors_exclude

By default, the selectors search is applied page-wide. If there are some parts of the page that you do not want to include (like a header, sidebar or footer), you can add them to the selectors_exclude key.

custom_settings

This object is any custom Algolia settings you would like to pass to the index settings.

min_indexed_level

Lets you define the minimum level at which you want records to be indexed. For example, with a min_indexed_level: 1, you will only index records that have at least a lvl1 field.

This is especially useful when the documentation is split into several pages, but all pages duplicates the main title (see this issue).

js_render

The HTML code that we crawl is sometimes generated using Javascript. In those cases, the js_render option must be set to true. It will enable our internal proxy (Selenium) to render pages before crawling them.

This parameter is optional and is set to false by default.

js_wait

The js_wait parameter lets you change the default waiting time to render the webpage with the Selenium proxy.

This parameter is optional and is set to 0s by default.

use_anchors

The use_anchors is need to be set to True for javascript doc when the hash is used to route the query. Internally this will disable the canonicalize feature that is removing the hash from the url.

This parameter is optional and is set to False by default.

strip_chars

A list of character to remove from the text that is indexed.

Default is ": " .,;:§¶"

scrap_start_urls

Default if false

remove_get_params

Default if false

strict_redirect

Default if false

nb_hits

The number of object that should be indexed. Only used by the checker.

Default is 0.

Test the configuration with the generator

The generator allows to both generate the selectors and visualize on pages what is actually selected. Refer to html/generator/README.md to use it.

Test the UX/UI with the playground

To test it live, you can use the following HTML page:

# edit your credentials + index name in ./html/playground.html
$ open ./html/playground.html

Bootstrapping a config

$ ./bootstrap-config

Deploying

After pushing the configuration to the configuration repository you still have to deploy the scraper using the deploy script of this repository. For more on how to use the script: html/deploy/README.md.

Development

Docker

You can build a development version of the image, to be used in development. It will build the exact same image than the prod one but will expect the /root/src folder to be mapped to a volume on the host. This lets you edit the python files in your favorite editor in the host while still being able to run the script in a Docker environment.

First, build the development image:

docker build -t algolia/documentation-scraper-dev -f Dockerfile.dev .

Then, use a script to remove any dev container and rebuild it.

$ docker stop docname
$ docker rm docname
$ docker run \
    -e APPLICATION_ID=appId \
    -e API_KEY=apiKey \
    -e INDEX_PREFIX=prefix_ \
    -e CONFIG="$(cat configs/docname.json)" \
    -v `pwd`/src:/root/src \
    --name docname \
    -t algolia/documentation-scraper-dev \
    /root/run

And use this one to run the tests:

$ docker stop docname
$ docker rm docname
$ docker run \
    -e APPLICATION_ID=appId \
    -e API_KEY=apiKey \
    -e INDEX_PREFIX=prefix_ \
    -e CONFIG="$(cat configs/docname.json)" \
    -v `pwd`/src:/root/src \
    --name docname \
    -t algolia/documentation-scraper-dev \
    /root/test

Prod

In production, you build the image from the default Docker file, then run the container.

Several documentations are using Javascript to generate the HTML code. To handle those documentations, this image which embeds our Selenium proxy in order to render webpages before crawling them. Note that your JSON configuration file must set the js_render parameter to true see js_render. If not, the Selenium instance won't be started.

$ docker build -t algolia/documentation-scraper .
$ docker run \
    -e APPLICATION_ID=appId \
    -e API_KEY=apiKey \
    -e INDEX_PREFIX=prefix_ \
    -e CONFIG="$(cat configs/docname.json)" \
    --name docname \
    -t algolia/documentation-scraper

Checker

The checker, in checker directory, is an automatic tool to check that the crawling infra behind DocSearch is running and that configurations do not have issues.

Deployer

The deployer, in deployer directory, is an automatic tool to deploy new configuration in the crawling infra of Algolia

Possible issues

It could happen that the crawled website returned duplicated data. Most of the time, this is because the crawled website, got the same url with two different scheme. If there is http://website.com/page and http://website.com/page/, notice the second one, the url is ended by /, and for the scrapper, this is two different urls.

In most of the cases, you'll only have to add a regex to the stop_urls in the config.json :

$ "stop_urls": [
  "/$"
]

But sometimes, the website's url you want to scrap are all ending with /, so just specify which url you want to get rid of, like this :

$ "stop_urls": [
    "http://website.com/page/"
  ]

And that way, only the first one will be taken in consideration.

Be careful to remove any hashsigns from the urls if it contains some

Bad :

$ "stop_urls": [
    "http://website.com/page/#foo"
  ]

Good :

$ "stop_urls": [
    "/$"
  ]

Or :

$ "stop_urls": [
    "http://website.com/page/"
  ]

About

DocSearch - Configurations

https://community.algolia.com/docsearch/