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In this video, we are going to learn how to invoke a lambda function with using the SLA.

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So basically we can invoke a lambda functions with different ways, so we can invoke directly using

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a lambda management console or we can use Lambda API or we can use a SDK or we can use a command line

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interface which is the SLA.

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So in this video we will invoke with the aid.

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Obviously, we can also configure other sources to invoke our function or we can configure Lambda to

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read from a stream or queue and invoke our function.

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We will see all these parts in the upcoming lectures.

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Before we start to invoke Lambda function, we should understand the invocation types.

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When you invoke a function, we can choose to invoke it synchronously or asynchronously.

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With synchronous invocation, we wait for the function to process the event and return the response

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with asynchronous invocation, lambda cues, the event for processing and returns the response immediately.

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So in this early section of the course, I will mainly invoke with the synchronous way to lambda function.

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But after that, in the second part of the course, we will discuss a lambda event driven architectures

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and continue with the Invoke Lambda functions asynchronously.

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Now let's focus on the synchronous invocations for the lambda functions.

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So we have already created a lambda function in the last section with using the measurement console.

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You can see in here under the lambda we have my function.

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Now it's time to invoke this lambda function with using the ADA.

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To do that, please open the pseudocode and come here.

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So we should create a new subfolder under the Section seven.

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So I'm going to choose, create the section seven and create new folder.

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Which name is.

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Lecture.

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Four, three.

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Okay, very good.

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So we basically add these similar commands in this lecture 43 folder.

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For that purpose, I'm going to copy this command text.

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And paste under the lecture portal three.

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So I'm going to change the.

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Our caption, which is the invoke lambda function using the SLA and we will follow similar commands,

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which is the lambda list function and get function.

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After that, we will invoke our function using the CLI command.

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So basically when we invoke a function synchronously, lambda runs the function and waits for a response

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when the function completes.

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Lambda returns the response from the functions code with additional data such as the version of the

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function that was invoked in order to invoke a function synchronously with the SLA command.

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We should use invoke command.

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So before proceeding to invoke command, I would like to explain that I'm writing all the commands under

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the command takes the file according to lecture number.

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So you can see in here lecture 42 and 43 has different command text files which including the related

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commands under these text files.

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So I have saved these files.

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And after that run command in our PowerShell window, I'm saving these commands into text files that

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you can copy from there and paste your command window.

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So in order to do that, let me write down our invocation command so we can come here and put this command,

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which is the invoke command.

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So as you can see that we are using the alias lambda in command and specifying function name, which

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is the main function in our case.

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And we are giving the cell binary format row in base 64 out.

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And we basically signed the payload, which is the key value pair and response back to the response

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JSON file.

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So I will use this command to invoke our function.

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In order to do that, please click the terminal and open new terminal.

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And this is starting any PowerShell.

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If you verify that you for example, you should get function, which is the my function.

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Please verify that you have this function name in your environment.

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You can see that is the get function response with encoding to all the details.

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So now I'm going to run the IMO command for this, my function for that purpose and copy this command

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and paste in here and you can see in here a lambda IMO command and giving this configuration.

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If you hit the enter you will get exception.

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What is this exception?

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Invalid request content exception.

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So when calling this IMO cooperation, you can get this exception for the could not pass request but

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into JSON file.

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So as you can see that we are passing this payload in this format, but we have to give different format

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in order to solve this exception.

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First of all, the important part is providing these command configuration.

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The CLI binary format option is required.

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If you are using the slide version two, we can also configure this option into our config file.

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But you should you should verify that these configurations should be executed in location command.

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And after that we should change this payload according to double code, another required operation.

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In my case, I need to change.

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This payload is a double code.

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You can see that we have single code.

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I'm going to.

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That's the correct one.

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You can see that key and volume information required to double code to understand the correct JSON format.

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So now I think it is okay, let's copy this command and paste again in here and hit enter.

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Okay.

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Now you should see the following output response.

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That means we have successfully invoke our lambda function.

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And you can also see that there is a response JSON generated in our main folder.

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But this should be in here.

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Okay.

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Yes, I'm moving this response station under the lecture 43 and in here you can see that such code is

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200 success and the body is the helo from lambda.

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This response file creates from the outside because we should run these commands under the.

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Lecture folders.

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You can see in here, I'm going to come section seven and you can see in here lecture 4 to 3.

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Now we should run this command under this folder to see correct response to subject.

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Okay, these are in location command and this is the response.

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So that means we have successfully run the lambda functions.

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We can also verify lambda execution from Amazon Cloud which logs?

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Let's open the function, go to function monitor and open the v logs in the cloud.

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Watch.

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And now I'm going to verify that we have invoked our function successfully in here from the cloud commands.

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Very good.

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And we can also set the multi-line character when running invoke command and command window.

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So if you come back to our we just do code.

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You can see in here under the command text, we are saving all the commands in this text file.

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Now I'm going to explain how we can make it multi-line characters.

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So for Windows.

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I'm going to add Multi-line character with this character.

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You can see in here, I can run my command with multi-line characters.

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Let's verify with the cell.

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Let me close this one and create a new terminal.

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And if you pass this command, you can see that I can make multi-line character.

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But of course, before that, I would like to.

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Locate.

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Correct folder.

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Now I'm going to run again, hit the enter and see that the status code return to 200 success.

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So that means I can invoke our lambda function with multi-line characters, but if you are using to

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make the multi-line character is differentiate.

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So that's why I'm also pasting in here.

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This.

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You can see in here, Windows is using this character and Mac is using this character to make it multi-line

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characters.

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As you can see that we have successfully invoke our lambda function and it returns 200 success and we

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have verified that this is running from our measurement console.

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In the next video we are going to invoke with passing the event JSON object.