Reddit Thread Emotion Analyzer

This sample requests the JSON file related to a reddit thread by doing an HTTP request on a Reddit URL and appending .json at the end of it.

This JSON file contains data about the thread as well as the first 200 comments of a thread.

Prerequisites

You will need the following:

• Latest LTS of .NET Core
• Azure Account (free trial available)
• Create a Cognitive Services Text Analytics service (see below)
• Creating a local.settings.json file
  • CognitiveServices_Key environment variable containing the Cognitive Services Key
  • CognitiveServices_Endpoint environment variable containing the Cognitive Services Endpoint

Deploy Sample Resources

All necessary resources to deploy this sample will be deployed by clicking on the following button.

Build

We need to first clone the repository.

git clone https://github.com/MaximRouiller/RedditEmotionAnalyzer

With Visual Studio

Open up RedditEmotionAnalyzer.App\RedditEmotionAnalyzer.App.sln by double clicking on it.

Use the menu Build > Build Solution and the solution will compile and be ready for use.

Use the Debug > Start Debugging to launch the Azure Functions process

With Code

Open up the folder RedditEmotionAnalyzer.App.

Use the menu Terminal > Run Build Task... and the solution will compile and be ready for use.

Use the Run > Start Debugging to launch the Azure Functions process

Running an example

Once your application is launched, you just need to open up a browser and use a Reddit thread in the url parameter.

The following example return the results immediately.

http://localhost:7071/api/AnalyzeRedditThread?url=<URL>

http://localhost:7071/api/AnalyzeRedditThread?url=https://www.reddit.com/r/dotnet/comments/ftsjhp/what_did_you_all_do_this_week/

This example returns a URL on which to check the status of the request. This uses Azure Durable functions.

http://localhost:7071/api/RedditThreadAnalyzer_HttpStart?url=<URL>

http://localhost:7071/api/RedditThreadAnalyzer_HttpStart?url=https://www.reddit.com/r/dotnet/comments/ftsjhp/what_did_you_all_do_this_week/

It returns the following payload.

{
    "id": "1ce610e87165442d88895b23a3f756ec",
    "statusQueryGetUri": "http://localhost:7071/runtime/webhooks/durabletask/instances/1ce610e87165442d88895b23a3f756ec?taskHub=TestHubName&connection=Storage&code=uWgiCct6AA/mmvrY/hNE38V/vcrdMDaKypT3FItIuzvh95bQFCTYuA==",
    "sendEventPostUri": "...",
    "terminatePostUri": "...",
    "purgeHistoryDeleteUri": "..."
}

Querying the statusQueryGetUri from the browser will return the status of the processing. Once completed, we're going to have the following payload.

{
    "name": "RedditThreadAnalyzer",
    "instanceId": "eef70ba78ee14cdeaa0330de4a7c85ce",
    "runtimeStatus": "Completed",
    "input": "https://www.reddit.com/r/dotnet/comments/ftsjhp/what_did_you_all_do_this_week/.json",
    "customStatus": null,
    "output": {
        "Positive": 31.506849315068493,
        "Negative": 17.80821917808219,
        "Neutral": 27.397260273972602,
        "Mixed": 23.28767123287671
    },
    "createdTime": "2020-04-08T12:46:46Z",
    "lastUpdatedTime": "2020-04-08T12:46:52Z"
}