Lambda_Structure_Flashcards

Question 1

What are the four main sections of a Lambda function?

Answer 1

1. Imports (libraries/SDKs) 2. Clients (AWS service connections) 3. Helper Functions (reusable logic) 4. Handler (entry point that auto-runs)

Question 2

What does the imports section of a Lambda do?

Answer 2

Brings in libraries and SDKs like json - os - boto3 - difflib - re

Question 3

What does the clients section of a Lambda do?

Answer 3

Creates connections to AWS services like dynamodb = boto3.client(‘dynamodb’) and bedrock_runtime = boto3.client(‘bedrock-runtime’)

Question 4

What does the helper functions section of a Lambda do?

Answer 4

Contains reusable logic that the handler calls - like get_ddb_entry() - classify_intent_bedrock() - extract_extension_number()

Question 5

What does the handler section of a Lambda do?

Answer 5

Entry point that auto-runs when Lambda is triggered - orchestrates helper functions and returns results

Question 6

What is the handler function signature?

Answer 6

def lambda_handler(event - context) - event contains input data - context contains runtime info

Question 7

What triggers the ivr-router Lambda?

Answer 7

Lex invokes it when a caller speaks - AWS automatically calls lambda_handler

Question 8

What does ivr-router receive in the event object?

Answer 8

inputTranscript (what caller said) - sessionState - sessionAttributes including PhoneNumber and Language

Question 9

What is the order of operations in ivr-router handler?

Answer 9

1. Get transcript from event 2. Query DynamoDB for LOB intents 3. Try to match utterance 4. Return session attributes

Question 10

What are the helper functions in ivr-router?

Answer 10

get_ddb_entry - get_bedrock_response - classify_intent_bedrock - extract_extension_number - extract_name - simple_match_utterance - _respond

Question 11

What does get_ddb_entry() do?

Answer 11

Queries DynamoDB using phone number (DNIS) to get that LOB’s configured intents

Question 12

What does simple_match_utterance() do?

Answer 12

Fuzzy matches the caller’s transcript against configured utterances in DynamoDB

Question 13

What does classify_intent_bedrock() do?

Answer 13

Uses Claude/Bedrock to classify the intent if fuzzy matching fails

Question 14

What does extract_extension_number() do?

Answer 14

Parses the transcript to find extension numbers like “extension 123” or “dial 500”

Question 15

What does extract_name() do?

Answer 15

Parses the transcript to find names like “connect me to John Smith”

Question 16

What does _respond() do?

Answer 16

Formats the return object with session attributes (action - QueueArn - Response - label)

Question 17

What does ivr-router return to Lex?

Answer 17

Session attributes dictionary containing action - QueueArn - Response - PhoneNumber - InfoPrompt - ModuleArn - label

Question 18

Why are clients defined outside the handler?

Answer 18

Performance - they’re initialized once when Lambda cold starts - reused across invocations

Question 19

What is a Lambda cold start?

Answer 19

First invocation when AWS spins up new container - imports and clients run once - subsequent calls reuse them

Question 20

What happens if get_ddb_entry() returns nothing?

Answer 20

Lambda falls back to default behavior - returns NoMatch action