The device detection data file contains meta data that can provide additional information about the various records in the data model.This example shows how to access this data and display the values available.
To help navigate the data, it's useful to have an understanding of the types of records that are present:
- Component - A record relating to a major aspect of the entity making a web request. There are currently 4 components: Hardware, Software Platform (OS), Browser and Crawler.
- Profile - A record containing the details for a specific instance of a component. An example of a hardware profile would be the profile for the iPhone 13. An example of a platform profile would be Android 12.1.0.
- Property - Each property will have a specific value (or values) for each profile. An example of a hardware property is 'IsMobile'. An example of a browser property is 'BrowserName'.
The example will output each component in turn, with a list of the properties associated with each component. Some of the possible values for each property are also displayed. There are too many profiles to display, so we just list the number of profiles for each component.
Finally, the evidence keys that are accepted by device detection are listed. These are the keys that, when added to the evidence collection in flow data, could have some impact on the result returned by device detection.
This example is available in full on GitHub.
Required NuGet Dependencies:
- FiftyOne.DeviceDetection
- Microsoft.Extensions.Logging.Console
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using FiftyOne.Pipeline.Core.Data;
using FiftyOne.Pipeline.Engines;
using FiftyOne.Pipeline.Engines.FiftyOne.Data;
using Microsoft.Extensions.Logging;
using System;
using System.IO;
using System.Linq;
using System.Text;
{
public class Program
{
public class Example : ExampleBase
{
public void Run(string dataFile, ILoggerFactory loggerFactory, TextWriter output)
{
// Build a new on-premise Hash engine with the low memory performance profile.
// Note that there is no need to construct a complete pipeline in order to access
// the meta-data.
// If you already have a pipeline and just want to get a reference to the engine
// then you can use `var engine = pipeline.GetElement<DeviceDetectionHashEngine>();`
using (var ddEngine = new DeviceDetectionHashEngineBuilder(loggerFactory)
// We use the low memory profile as its performance is sufficient for this
// example. See the documentation for more detail on this and other
// configuration options:
// https://51degrees.com/documentation/_device_detection__features__performance_options.html
// https://51degrees.com/documentation/_features__automatic_datafile_updates.html
.SetPerformanceProfile(PerformanceProfiles.LowMemory)
// inhibit auto-update of the data file for this test
.SetAutoUpdate(false)
.SetDataFileSystemWatcher(false)
.SetDataUpdateOnStartup(false)
.Build(dataFile, false))
{
OutputComponents(ddEngine, output);
OutputProfileDetails(ddEngine, output);
OutputEvidenceKeyDetails(ddEngine, output);
ExampleUtils.CheckDataFile(ddEngine, loggerFactory.CreateLogger<Program>());
}
}
private void OutputEvidenceKeyDetails(DeviceDetectionHashEngine ddEngine, TextWriter output)
{
output.WriteLine();
if(typeof(EvidenceKeyFilterWhitelist).IsAssignableFrom(ddEngine.EvidenceKeyFilter.GetType()))
{
// If the evidence key filter extends EvidenceKeyFilterWhitelist then we can
// display a list of accepted keys.
var filter = ddEngine.EvidenceKeyFilter as EvidenceKeyFilterWhitelist;
output.WriteLine($"Accepted evidence keys:");
foreach (var entry in filter.Whitelist)
{
output.WriteLine($"\t{entry.Key}");
}
}
else
{
output.WriteLine($"The evidence key filter has type " +
$"{ddEngine.EvidenceKeyFilter.GetType().Name}. As this does not extend " +
$"EvidenceKeyFilterWhitelist, a list of accepted values cannot be " +
$"displayed. As an alternative, you can pass evidence keys to " +
$"filter.Include(string) to see if a particular key will be included " +
$"or not.");
output.WriteLine($"For example, header.user-agent is " +
(ddEngine.EvidenceKeyFilter.Include("header.user-agent") ? "" : "not ") +
"accepted.");
}
}
private void OutputProfileDetails(DeviceDetectionHashEngine ddEngine, TextWriter output)
{
// Group the profiles by component and then output the number of profiles
// for each component.
var groups = ddEngine.Profiles.GroupBy(p => p.Component.Name);
output.WriteLine();
output.WriteLine($"Profile counts:");
foreach (var group in groups)
{
output.WriteLine($"{group.Key} Profiles: {group.Count()}");
}
}
private void OutputComponents(DeviceDetectionHashEngine ddEngine, TextWriter output)
{
foreach (var component in ddEngine.Components)
{
// Output the component name as well as a list of all the associated properties.
// If we're outputting to console then we also add some formatting to make it
// more readable.
Console.ForegroundColor = ConsoleColor.White;
Console.BackgroundColor = ConsoleColor.DarkBlue;
output.Write($"Component - {component.Name}");
Console.ResetColor();
output.WriteLine();
OutputProperties(component, output);
}
}
private void OutputProperties(IComponentMetaData component, TextWriter output)
{
foreach (var property in component.Properties)
{
// Output some details about the property.
// If we're outputting to console then we also add some formatting to make it
// more readable.
Console.ForegroundColor = ConsoleColor.White;
Console.BackgroundColor = ConsoleColor.DarkRed;
output.Write($"Property - {property.Name}");
Console.ResetColor();
output.WriteLine($"[Category: {property.Category}]" +
$"({property.Type.Name}) - {property.Description}");
// Next, output a list of the possible values this property can have.
// Most properties in the Device Metrics category do not have defined
// values so exclude them.
if (property.Category != "Device Metrics")
{
StringBuilder values = new StringBuilder("Possible values: ");
foreach (var value in property.Values.Take(20))
{
// add value
values.Append(TruncateToNl(value.Name));
// add description if exists
if (string.IsNullOrEmpty(value.Description) == false)
{
values.Append($"({value.Description})");
}
values.Append(",");
}
if (property.Values.Count() > 20)
{
values.Append($" + {property.Values.Count() - 20} more ...");
}
output.WriteLine(values);
}
}
}
// Truncate value if it contains newline (esp for the JavaScript property)
private string TruncateToNl(string s)
{
var lines = s.Split(new char[] { '\n' }, StringSplitOptions.RemoveEmptyEntries);
var result = lines.FirstOrDefault();
if (lines.Length > 1)
{
result += " ...";
}
return result;
}
}
static void Main(string[] args)
{
// Use the supplied path for the data file or find the lite file that is included
// in the repository.
var dataFile = args.Length > 0 ? args[0] :
// In this example, by default, the 51degrees "Lite" file needs to be somewhere in the
// project space, or you may specify another file as a command line parameter.
//
// Note that the Lite data file is only used for illustration, and has limited accuracy
// and capabilities. Find out about the Enterprise data file on our pricing page:
// https://51degrees.com/pricing
ExampleUtils.FindFile(Constants.LITE_HASH_DATA_FILE_NAME);
// Configure a logger to output to the console.
var loggerFactory = LoggerFactory.Create(b => b.AddConsole());
var logger = loggerFactory.CreateLogger<Program>();
if (dataFile != null)
{
new Example().Run(dataFile, loggerFactory, Console.Out);
}
else
{
logger.LogError("Failed to find a device detection data file. Make sure the " +
"device-detection-data submodule has been updated by running " +
"`git submodule update --recursive`. By default, the 'lite' file included " +
"with this code will be used. A different file can be specified " +
"by supplying the full path as a command line argument");
}
// Dispose the logger to ensure any messages get flushed
loggerFactory.Dispose();
}
}
}