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This way the directory structure remains the same as with the real lib and one can apply the same build options regardless of where the lib is stored, removing any possible confusion.
153 lines
6.8 KiB
Plaintext
153 lines
6.8 KiB
Plaintext
51Degrees Device Detection
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You can also include 51Degrees for inbuilt device detection enabling attributes
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such as screen size (physical & pixels), supported input methods, release date,
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hardware vendor and model, browser information, and device price among many
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others. Such information can be used to improve the user experience of a web
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site by tailoring the page content, layout and business processes to the
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precise characteristics of the device. Such customisations improve profit by
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making it easier for customers to get to the information or services they
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need. Attributes of the device making a web request can be added to HTTP
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headers as configurable parameters.
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In order to enable 51Degrees download the 51Degrees source code from the
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official git repository :
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- either use the proven stable but frozen 3.2.10 version which
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supports the Trie algorithm :
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git clone https://git.51Degrees.com/Device-Detection.git -b v3.2.10
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- or use the new 3.2.12.12 version which continues to receive database
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updates and supports a new Hash Trie algorithm, but which is not
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compatible with older Trie databases :
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git clone https://github.com/51Degrees/Device-Detection.git -b v3.2.12
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then run 'make' with USE_51DEGREES and 51DEGREES_SRC set. Both 51DEGREES_INC
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and 51DEGREES_LIB may additionally be used to force specific different paths
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for .o and .h, but will default to 51DEGREES_SRC. Make sure to replace
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'51D_REPO_PATH' with the path to the 51Degrees repository.
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51Degrees provide 3 different detection algorithms:
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1. Pattern - balances main memory usage and CPU.
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2. Trie - a very high performance detection solution which uses more main
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memory than Pattern.
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3. Hash Trie - replaces Trie, 3x faster, 80% lower memory consumption and
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tuning options.
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To make with 51Degrees Pattern algorithm use the following command line.
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$ make TARGET=<target> USE_51DEGREES=1 51DEGREES_SRC='51D_REPO_PATH'/src/pattern
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To use the 51Degrees Trie algorithm use the following command line.
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$ make TARGET=<target> USE_51DEGREES=1 51DEGREES_SRC='51D_REPO_PATH'/src/trie
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A data file containing information about devices, browsers, operating systems
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and their associated signatures is then needed. 51Degrees provide a free
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database with Github repo for this purpose. These free data files are located
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in '51D_REPO_PATH'/data with the extensions .dat for Pattern data and .trie for
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Trie data. Free Hash Trie data file can be obtained by signing up for a licence
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key at https://51degrees.com/products/store/on-premise-device-detection.
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For HAProxy developers who need to verify that their changes didn't affect the
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51Degrees implementation, a dummy library if provided in the contrib/51d
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directory. This does not function, but implements the API such that the
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51Degrees module can be used (but not return any meaningful information). To
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test either Pattern or Hash Trie, build with:
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$ make TARGET=<target> USE_51DEGREES=1 51DEGREES_SRC=contrib/51d/src/pattern
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or
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$ make TARGET=<target> USE_51DEGREES=1 51DEGREES_SRC=contrib/51d/src/trie
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respectively.
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The configuration file needs to set the following parameters:
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global
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51degrees-data-file path to the Pattern or Trie data file
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51degrees-property-name-list list of 51Degrees properties to detect
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51degrees-property-separator separator to use between values
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51degrees-cache-size LRU-based cache size (disabled by default)
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The following is an example of the settings for Pattern.
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global
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51degrees-data-file '51D_REPO_PATH'/data/51Degrees-LiteV3.2.dat
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51degrees-property-name-list IsTablet DeviceType IsMobile
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51degrees-property-separator ,
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51degrees-cache-size 10000
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HAProxy needs a way to pass device information to the backend servers. This is
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done by using the 51d converter or fetch method, which intercepts the HTTP
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headers and creates some new headers. This is controlled in the frontend
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http-in section.
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The following is an example which adds two new HTTP headers prefixed X-51D-
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frontend http-in
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bind *:8081
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default_backend servers
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http-request set-header X-51D-DeviceTypeMobileTablet %[51d.all(DeviceType,IsMobile,IsTablet)]
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http-request set-header X-51D-Tablet %[51d.all(IsTablet)]
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Here, two headers are created with 51Degrees data, X-51D-DeviceTypeMobileTablet
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and X-51D-Tablet. Any number of headers can be created this way and can be
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named anything. 51d.all( ) invokes the 51degrees fetch. It can be passed up to
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five property names of values to return. Values will be returned in the same
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order, separated by the 51-degrees-property-separator configured earlier. If a
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property name can't be found the value 'NoData' is returned instead.
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In addition to the device properties three additional properties related to the
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validity of the result can be returned when used with the Pattern method. The
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following example shows how Method, Difference and Rank could be included as one
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new HTTP header X-51D-Stats.
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frontend http-in
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...
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http-request set-header X-51D-Stats %[51d.all(Method,Difference,Rank)]
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These values indicate how confident 51Degrees is in the result that that was
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returned. More information is available on the 51Degrees web site at:
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https://51degrees.com/support/documentation/pattern
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The above 51d.all fetch method uses all available HTTP headers for detection. A
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modest performance improvement can be obtained by only passing one HTTP header
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to the detection method with the 51d.single converter. The following example
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uses the User-Agent HTTP header only for detection.
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frontend http-in
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...
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http-request set-header X-51D-DeviceTypeMobileTablet %[req.fhdr(User-Agent),51d.single(DeviceType,IsMobile,IsTablet)]
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Any HTTP header could be used inplace of User-Agent by changing the parameter
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provided to req.fhdr.
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When compiled to use the Trie detection method the trie format data file needs
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to be provided. Changing the extension of the data file from dat to trie will
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use the correct data.
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global
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51degrees-data-file '51D_REPO_PATH'/data/51Degrees-LiteV3.2.trie
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When used with Trie the Method, Difference and Rank properties are not
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available.
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The free Lite data file contains information about screen size in pixels and
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whether the device is a mobile. A full list of available properties is located
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on the 51Degrees web site at:
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https://51degrees.com/resources/property-dictionary
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Some properties are only available in the paid for Premium and Enterprise
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versions of 51Degrees. These data sets not only contain more properties but
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are updated weekly and daily and contain signatures for 100,000s of different
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device combinations. For more information see the data options comparison web
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page:
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https://51degrees.com/compare-data-options
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