72 lines
2.4 KiB
Markdown
72 lines
2.4 KiB
Markdown
## URL Function
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Create a basic AWS Lambda function that will be triggered when you enter a URL in the browser
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### Solution
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#### Define a function
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1. Go to Lambda console panel and click on `Create function`
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1. Give the function a name like `urlFunction`
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2. Select `Python3` runtime
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3. Now to handle function's permissions, we can attach IAM role to our function either by setting a role or creating a new role. I selected "Create a new role from AWS policy templates"
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4. In "Policy Templates" select "Simple Microservice Permissions"
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1. Next, you should see a text editor where you will insert a code similar to the following
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#### Function's code
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```
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import json
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def lambda_handler(event, context):
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firstName = event['name']
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return 'Hello ' + firstName
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```
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2. Click on "Create Function"
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#### Define a test
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1. Now let's test the function. Click on "Test".
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2. Select "Create new test event"
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3. Set the "Event name" to whatever you'd like. For example "TestEvent"
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4. Provide keys to test
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```
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{
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"name": 'Spyro'
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}
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```
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5. Click on "Create"
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#### Test the function
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1. Choose the test event you've create (`TestEvent`)
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2. Click on the `Test` button
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3. You should see something similar to `Execution result: succeeded`
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4. If you'll go to AWS CloudWatch, you should see a related log stream
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#### Define a trigger
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We'll define a trigger in order to trigger the function when inserting the URL in the browser
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1. Go to "API Gateway console" and click on "New API Option"
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2. Insert the API name, description and click on "Create"
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3. Click on Action -> Create Resource
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4. Insert resource name and path (e.g. the path can be /hello) and click on "Create Resource"
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5. Select the resource we've created and click on "Create Method"
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6. For "integration type" choose "Lambda Function" and insert the lambda function name we've given to the function we previously created. Make sure to also use the same region
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7. Confirm settings and any required permissions
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8. Now click again on the resource and modify "Body Mapping Templates" so the template includes this:
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```
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{ "name": "$input.params('name')" }
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```
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9. Finally save and click on Actions -> Deploy API
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#### Running the function
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1. In the API Gateway console, in stages menu, select the API we've created and click on the GET option
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2. You'll see an invoke URL you can click on. You might have to modify it to include the input so it looks similar to this: `.../hello?name=mario`
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3. You should see in your browser `Hello Mario`
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