The document discusses serverless computing using AWS Lambda. It provides an overview of serverless architecture and patterns, describing how Lambda functions can be triggered by events from other AWS services asynchronously or invoked directly. It also demonstrates how to create a Python Lambda function that returns a greeting based on an event payload, including zipping the code, creating an IAM role, and deploying the function.

1. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Going Serverless with AWS
1
Suman Debnath
Principal Developer Advocate

2. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved. 2
• Serverless Computing
• Serverless Architecture
• Serverless Application with Python

3. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved. 3
• Serverless Computing
• Serverless Architecture
• Serverless Application with Python

4. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
4
Build and run applications without thinking about servers
Serverless Computing
4

5. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Serverless Computing
No servers to provision,
scale or manage
Flexible scaling Built-in availability
and
fault tolerance
5

6. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda
6
• Run code without thinking about servers
• Pay for only the compute time you consume
• Lambda takes care of everything required to
run and scale your code with high availability
6

7. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function
7
7

8. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function
8
8

9. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function
9
Define python function1
9

10. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function
10
Define python function1
event - data about what triggered invocation
context - runtime information about your function
2
10

11. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function
11
Define python function1
event - data about what triggered invocation
context - runtime information about your function
2
11
Return value sent back as response3

12. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function
12
Define python function1
event - data about what triggered invocation
context - runtime information about your function
2
Return value sent back as response3
app.py
12

13. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function
13
Define python function1
event - data about what triggered invocation
context - runtime information about your function
2
Return value sent back as response3
app.py
13

14. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function
14
Define python function1
event - data about what triggered invocation
context - runtime information about your function
2
Return value sent back as response3
app.py
>>> import app
>>> app.handler(event={}, context=None)
'hello world!'
$ python
14

15. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function
15
Define python function1
event - data about what triggered invocation
context - runtime information about your function
2
Return value sent back as response3
app.py
15

16. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function
16
Define python function1
event - data about what triggered invocation
context - runtime information about your function
2
Return value sent back as response3
app.py
$ pip install awscli
16

17. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function
17
Define python function1
event - data about what triggered invocation
context - runtime information about your function
2
Return value sent back as response3
app.py
$ pip install awscli
$ aws config
17

18. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function
18
Define python function1
event - data about what triggered invocation
context - runtime information about your function
2
Return value sent back as response3
app.py
18

19. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function
19
Define python function1
event - data about what triggered invocation
context - runtime information about your function
2
Return value sent back as response3
app.py
$ aws lambda create-function
--function-name hello
--handler app.handler
--runtime python3.6
--role arn:aws:iam::635100884080:role/MyApp
--zip "fileb://./app.zip"
19

20. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function
20
Define python function1
event - data about what triggered invocation
context - runtime information about your function
2
Return value sent back as response3
app.py
$ aws lambda create-function
--function-name hello
--handler app.handler
--runtime python3.6
--role arn:aws:iam::635100884080:role/MyApp
--zip "fileb://./app.zip”
$ aws lambda invoke --function-name hello output
20

21. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function
21
Define python function1
event - data about what triggered invocation
context - runtime information about your function
2
Return value sent back as response3
app.py
$ aws lambda create-function
--function-name hello
--handler app.handler
--runtime python3.6
--role arn:aws:iam::635100884080:role/MyApp
--zip "fileb://./app.zip”
$ aws lambda invoke --function-name hello output
$ cat output
hello world!
21

22. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function Input
22
app.py
22

23. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function Input
23
app.py
$ aws lambda invoke --function-name hello --payload ‘{“foo": ”bar"}' output
23

24. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function Input
24
app.py
$ aws lambda invoke --function-name hello --payload ‘{“foo": ”bar"}' output
24

25. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function Input
25
app.py
$ aws lambda invoke --function-name hello --payload ‘{“foo": ”bar"}' output
$ cat output
BAR
25

26. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function Input
26
app.py
$ aws lambda invoke --function-name hello --payload ‘{“foo": ”bar"}' output
$ cat output
BAR
$ aws lambda invoke --function-name hello --payload ‘{“foo": ”baz"}' output
26

27. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function Input
27
app.py
$ aws lambda invoke --function-name hello --payload ‘{“foo": ”bar"}' output
$ cat output
BAR
$ aws lambda invoke --function-name hello --payload ‘{“foo": ”baz"}' output
$ cat output
BAZ
27

28. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function Invocation
28

29. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function Invocation
29
$ aws lambda invoke --function-name hello --payload ‘{“foo": ”bar"}' output

30. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function Invocation
30
$ aws lambda invoke --function-name hello --payload ‘{“foo": ”bar"}' output
Download Code

31. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function Invocation
31
$ aws lambda invoke --function-name hello --payload ‘{“foo": ”bar"}' output
Download Code Start new container

32. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function Invocation
32
$ aws lambda invoke --function-name hello --payload ‘{“foo": ”bar"}' output
Download Code Start new container Bootstrap the runtime

33. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function Invocation
33
$ aws lambda invoke --function-name hello --payload ‘{“foo": ”bar"}' output
Download Code Start new container Bootstrap the runtime Start Code

34. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function Invocation
34
$ aws lambda invoke --function-name hello --payload ‘{“foo": ”bar"}' output
Download Code Start new container Bootstrap the runtime Start Code
Cold Start

35. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function Invocation
35
$ aws lambda invoke --function-name hello --payload ‘{“foo": ”bar"}' output
Download Code Start new container Bootstrap the runtime Start Code
Cold Start Warm Start

36. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda Function Invocation
36
$ aws lambda invoke --function-name hello --payload ‘{“foo": ”bar"}' output
Download Code Start new container Bootstrap the runtime Start Code
Cold Start Warm Start
$ aws lambda invoke --function-name hello --payload ‘{“foo": ”baz"}' output

37. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved. 37
• Serverless Computing
• Serverless Architecture
• Serverless Application with Python

38. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Serverless Architecture Patterns
38

39. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Serverless Architecture
39
Event Trigger Lambda Services
Amazon API Gateway
Timer
SQS message
Amazon DynamoDB
Amazon S3

40. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Serverless Architecture
40
Event Trigger Lambda Services
Amazon API Gateway
Timer
SQS message
Amazon DynamoDB
Amazon S3
Think in terms of events

41. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Serverless Architecture
41
Event Trigger Lambda Services
Amazon API Gateway
Timer
SQS message
Amazon DynamoDB
Amazon S3

42. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Serverless Architecture
42
Event Trigger Lambda Services
Amazon API Gateway
Timer
SQS message
Amazon DynamoDB
Amazon S3
Decompose code into separate functions

43. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Synchronous Invocation
43
Event Trigger Lambda
$ aws lambda invoke
Manual Invocation

44. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Synchronous Invocation
44
Event Trigger Lambda
REST API Request
GET /users
{“http”: “response”}

45. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Async Invocation
45
Event Trigger Lambda Services

46. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Async Invocation
46
Event Trigger Lambda Services
Amazon S3
Object upload
1

47. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Async Invocation
47
Event Trigger Lambda Services
Amazon S3
Object upload
1
2
Return immediately

48. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Async Invocation
48
Event Trigger Lambda Services
Amazon S3
Object upload
1
2
Return immediately
3 Event trigger notification

49. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Async Invocation
49
Event Trigger Lambda Services
Amazon S3
Object upload
1
2
Return immediately
3 Event trigger notification
4 Generates thumbnail

50. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Async Invocation
50
Event Trigger Lambda Services
Amazon S3
Object upload
1
2
Return immediately
3 Event trigger notification
4 Generates thumbnail
5
Upload complete
Uploads to output bucket

51. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Stream/Poll Invocation
51
Event Trigger Lambda Poller Lambda

52. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Stream/Poll Invocation
52
Event Trigger Lambda Poller Lambda
Amazon SQS
message added
1
2
Return immediately

53. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Stream/Poll Invocation
53
Event Trigger Lambda Poller Lambda
Amazon SQS
message added
1
2
Return immediately
3 Poll for messages

54. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Stream/Poll Invocation
54
Event Trigger Lambda Poller Lambda
Amazon SQS
message added
1
2
Return immediately
3 Poll for messages
4 Message batch

55. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Stream/Poll Invocation
55
Event Trigger Lambda Poller Lambda
Amazon SQS
message added
1
2
Return immediately
3 Poll for messages
4 Message batch 5 Lambda function invoked

56. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Stream/Poll Invocation
56
Event Trigger Lambda Poller Lambda
Amazon SQS
message added
1
2
Return immediately
3 Poll for messages
4 Message batch 5 Lambda function invoked
Function execution finished

57. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Synchronous
57
Asynchronous Stream
Blocks until response is
returned from Lambda function
Lambda function triggered in
response to an event,
decoupled from event trigger
Lambda service polls for
changes on a stream, invokes
Lambda function with batch of
messages

58. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Synchronous
58
Asynchronous Stream
Blocks until response is
returned from Lambda function
Lambda function triggered in
response to an event,
decoupled from event trigger
Lambda service polls for
changes on a stream, invokes
Lambda function with batch of
messages
$ aws lambda invoke
Amazon API Gateway
request
/users

59. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Synchronous
59
Asynchronous Stream
Blocks until response is
returned from Lambda function
Lambda function triggered in
response to an event,
decoupled from event trigger
Lambda service polls for
changes on a stream, invokes
Lambda function with batch of
messages
$ aws lambda invoke
Amazon API Gateway
request
/users
Timer
Amazon S3 Object
Amazon SNS Topic

60. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Synchronous
60
Asynchronous Stream
Blocks until response is
returned from Lambda function
Lambda function triggered in
response to an event,
decoupled from event trigger
Lambda service polls for
changes on a stream, invokes
Lambda function with batch of
messages
$ aws lambda invoke
Amazon API Gateway
request
/users
Timer
Amazon S3 Object
Amazon SNS Topic
Amazon SQS Message
Amazon DynamoDB Stream
Amazon Kinesis Stream

61. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved. 61
• Serverless Computing
• Serverless Architecture
• Serverless Application with Python

62. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
62
Serverless Application using Python

63. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Lambda
63

64. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Creating our first Lambda Function
68

65. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Creating our first Lambda Function
69
$ zip -r app.zip app.py1

66. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Creating our first Lambda Function
70
$ zip -r app.zip app.py1
2 $ aws iam create-role
--role-name MyApp
--assume-role-policy-document '{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"Service": "lambda.amazonaws.com"
},
"Action": "sts:AssumeRole"
}
]
}'

67. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Creating our first Lambda Function
71
$ zip -r app.zip app.py1
2 $ aws iam create-role
--role-name MyApp
--assume-role-policy-document '{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"Service": "lambda.amazonaws.com"
},
"Action": "sts:AssumeRole"
}
]
}'
$ aws lambda create-function
--function-name hello
--handler app.handler
--runtime python3.6
--role arn:aws:iam::635100884080:role/MyApp
--zip "fileb://./app.zip"
3

68. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Creating our first Lambda Function
72
$ zip -r app.zip app.py1
2 $ aws iam create-role
--role-name MyApp
--assume-role-policy-document '{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"Service": "lambda.amazonaws.com"
},
"Action": "sts:AssumeRole"
}
]
}'
$ aws lambda create-function
--function-name hello
--handler app.handler
--runtime python3.6
--role arn:aws:iam::635100884080:role/MyApp
--zip "fileb://./app.zip"
3

69. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Creating our first Lambda Function
73
$ zip -r app.zip app.py1
2 $ aws iam create-role
--role-name MyApp
--assume-role-policy-document '{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"Service": "lambda.amazonaws.com"
},
"Action": "sts:AssumeRole"
}
]
}'
$ aws lambda create-function
--function-name hello
--handler app.handler
--runtime python3.6
--role arn:aws:iam::123456789012:role/MyApp
--zip "fileb://./app.zip"
3

70. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Chailce
80
• Python Serverless Microframework
• Create and deploy serverless applications
• Integration with may other AWS services
© 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Chailce
80
• Python Serverless Microframework
• Create and deploy serverless applications
• Integration with may other AWS services

71. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Chalice
81
Lambda
app.py
AWS Lambda

72. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Chalice
82
Lambda
chalice
AWS Lambda
app.py

73. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Chalice
83
Lambda
chalice
AWS Lambda
app.py
app defined at module level1

74. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
AWS Chalice
84
Lambda
chalice
AWS Lambda
app.py
app defined at module level1
one or more decorators can be defined2

75. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Deployment
85
$ chalice deploy
Creating deployment package.
Updating policy for IAM role: helloworld-dev
Creating lambda function: helloworld-dev-hello_world
Deleting Rest API: 56mbn4ke87
Deleting function: arn:aws:lambda:us-west-2:635100884080:function:helloworld-dev
Resources deployed:
- Lambda ARN: arn:aws:lambda:us-west-2:635100884080:function:helloworld-dev-hello_world
$ chalice invoke -n hello_world
"hello world!"
app.py

76. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
S3 Image Thumbnail Generator
86

77. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
S3 Image Thumbnail Generator
87
3rd party extensions
automatically handled from
requirements.txt

78. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
S3 Image Thumbnail Generator
88
Client created in module scope
Only part of cold-start time

79. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
S3 Image Thumbnail Generator
89
Client created in module scope
Only part of cold-start time
Module Import

80. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
S3 Image Thumbnail Generator
90
Trigger function when object is uploaded to
S3://mydemoimgbucket/.jpg

81. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
S3 Image Thumbnail Generator
91

82. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
S3 Image Thumbnail Generator
92
Event dictionary mapped to python object
download_file method from boto3 will
download file parts in parallel

83. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
S3 Image Thumbnail Generator
93
Generate 256x256 image and
save image to a temporary file

84. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
S3 Image Thumbnail Generator
94
Upload thumbnail back to S3,
upload_file from boto3 will use
parallelized multi part upload if needed

85. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Other Chalice Decorators
107

86. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved. 108
 Serverless Computing
 Serverless Architecture
 Serverless Application with Python

87. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Resources
109
• Introduction to AWS Lambda and Chalice
• GitHub for Chalice
• Serverless Framework for AWS
• AWS re:Invent 2018: A Serverless Journey: AWS Lambda Under the Hood

88. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved.
Stay Connected
110
/suman-d /_sumand

89. © 2020, Amazon Web Services, Inc. or its affiliates. All rights reserved. 111
@_sumand