AWS Lambda interface for Julia



Note, the `julia-observer-quote-cut-paste-0work` branch of this package has recently been updated for Julia 0.6.2. The update includes breaking API changes. This README.md file describes the new interface. The updated version does not yet have a release tag pending futhrur testing. If you would like to help with testing, please follow the instructions below.

AWS Lambda Interface for Julia.

If you are new to Lambda, please read What is AWS Lambda and try the Create a Simple Lambda Function (Node.js) exercise.

Build Status

With this package you can:

Getting Started

AWS Credentials

Your AWS credentials should be configured in the ~/.aws/credentials file or in the environment variables AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY. See the AWSCore configuration documentation or the AWS CLI User Guide for mode detail.

You can verify that your credentials are working by calling the IAM GetUser API:

julia> using AWSCore
julia> AWSCore.set_debug_level(1)
julia> AWSCore.Services.iam("GetUser")["User"]
Loading "octech" AWSCredentials from /Users/sam/.aws/credentials... (AKIAXXXXXXXXXXXXXXXX, XXX...)
Dict{String,Any} with 7 entries:
  "Arn"              => "arn:aws:iam::XXXXXXXXXXXX:user/sam"

Invoke a Lambda function from Julia

This example assumes that you created a Node.js Lambda function MyFunction in the Create a Simple Lambda Function exercise.

julia> using AWSLambda
julia> AWSLambda.invoke_lambda("MyFunction")
"Hello from Lambda"

Using the AWS Lambda Management Console, modify the Node.js source code of MyFunction to return the values of event arguments foo and bar:

exports.handler = (event, context, callback) => {
    let x = 'foo=' + event['foo'] + ', ' +
            'bar=' + event['bar']
    callback(null, x)

Now the function can be called with keyword arguments foo= and bar=:

julia> AWSLambda.invoke_lambda("MyFunction", foo=7, bar="xyz")
"foo=7, bar=xyz"

Deploy jl_lambda_eval to Lambda

The jl_lambda_eval Lambda function takes a Julia expression as input and returns the result of evaluating that expression. This function must be deployed to your AWS account before AWSLambda.@lambda_eval, AWSLambda.@lambda or AWSLambda.@deploy can be used:

julia> using AWSLambda
julia> AWSLambda.deploy_jl_lambda_eval()

After deployment jl_lambda_eval should be visible in the [AWS Lambda Console](https://console.aws.amazon.com/lambda/) (be sure to set the console to the correct AWS region). _To learn more about the internals of julia-observer-quote-cut-paste-24_work`julia-observer-quote-cut-paste-17workDockerfilejulia-observer-quote-cut-paste-18work`julia-observer-quote-cut-paste-59work`julia-observer-quote-cut-paste-19work@lambda_evaljulia-observer-quote-cut-paste-20work`julia-observer-quote-cut-paste-25work`julia-observer-quote-cut-paste-21_work```

julia AWSLambda.@lambda_eval run(uname -snr) Linux ip-10-13-21-185 4.9.85-38.58.amzn1.x86_64

julia AWSLambda.@lambda_eval ENV["LAMBDA_TASK_ROOT"] "/var/task"

julia> AWSLambda.@lambda_eval @time binomial(big(10^6), big(10^5)) 0.559756 seconds (7.31 k allocations: 94.242 KiB)


A more complex expression example:

julia> x = AWSLambda.@lambda_eval begin l = open(readlines, "/proc/cpuinfo") l = filter(i->ismatch(r"^model name", i), l) strip(split(l[1], ":")[2]) end

"Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz"

An expression with an embedded module:

julia> r = AWSLambda.@lambda_eval begin

       module Foo

           export foo

           using HTTP
           using JSON

           const url = "http://httpbin.org/ip"

           function foo()

       using .Foo


Dict{String,Any} with 1 entry: "origin" => ""

### Run a Julia function in the cloud

The `@lambda function ...` macro creates a local Julia function that
passes its arguments and its function body expression to `jl_lambda_eval`
and returns the result. Functions defined this way are not deployed as
new Lambda functions (they are executed dynamically by the `jl_lambda_eval`
Lambda) so they are only callable from the Julia program where they
are defined.

Multiple invocations of these functions can be run in parallel using Julia tasks.  e.g. using [`asyncmap`](https://docs.julialang.org/en/stable/stdlib/parallel/#Base.asyncmap) with `ntasks=500` will run 500 Labda invocations in parallel.
By default AWS Account concurrency limit is 1000 but this 
[can be increased if needed](https://docs.aws.amazon.com/lambda/latest/dg/concurrent-executions.html).

julia> AWSLambda.@lambda function foo(x) x = x * 2 system = chomp(readstring(uname)) return x, system end

julia> foo(7)

(14, "Linux")

A function to count primes in the cloud:

julia> AWSLambda.@lambda function count_primes(low::Int, high::Int)

       function is_prime(n)
           if n ≤ 1
               return false
           elseif n ≤ 3
               return true
           elseif n % 2 == 0 || n % 3 == 0
               return false
           i = 5
           while i * i ≤ n
               if n % i == 0 || n % (i + 2) == 0
                   return false
               i += 6
           return true

       c = count(is_prime, low:high)
       println("$c primes between $low and $high.")
       return c

count_primes (generic function with 1 method)

julia> count_primes(10, 100) 21 primes between 10 and 100.


Using `asyncmap` to count primes in parallel:

julia> sum(asyncmap(x->count_primes(x.start, x.stop), [1:1000000, 1000001:2000000, 2000001:3000000])) 78498 primes between 1 and 1000000.

70435 primes between 1000001 and 2000000.

67883 primes between 2000001 and 3000000.


_The `Base.asyncmap` function uses three concurrent tasks to call three
instances of `count_primes` in parallel._

The `@lambda function ...` macro accepts an optional `using ...` argument
that allows local modules to be used.

e.g. Count primes faster using the `Primes.jl` package:

julia> AWSLambda.@lambda using Primes function count_primes_fast(low::Int, high::Int)

       c = length(Primes.primes(low, high))
       println("$c primes between $low and $high.")
       return c

julia> count_primes_fast(10, 10^9) 50847530 primes between 10 and 1000000000.


_The `@lambda using ... function ...` macro bundles up the source files for
specified local modules and passess them to `jl_lambda_eval` along with the
function body and arguments each time the function is called._

### Deploy a Julia Lambda function

The examples above all rely on the `jl_lambda_eval` Lambda function to execute
Julia code on demand. The code is uploaded, compiled and executed at call time.

Deploying a new named Lambda function will enable your Julia code to be called 
using the AWS SDK for JavaScript, Python etc. The deployment process also
precompiles the Julia code to help speed up execution time.

Deploy a Lambda function to count prime numbers:

julia> AWSLambda.@deploy using Primes function count_primes_fast(low::Int, high::Int)

       c = length(Primes.primes(low, high))
       println("$c primes between $low and $high.")
       return c

The `@deploy` macro creates a new AWS Lambda named `count_primes_fast`.
It wraps the body of the function with serialisation/deserialistion code and
packages it into a .ZIP file along with the source code for the required
modules. The .ZIP file is then deployed to AWS Lambda. After deployment the
new function should be visible in the
[AWS Lambda Console](`https://console.aws.amazon.com/lambda/).

Use the console to configure a test event as follows, and then use the `Test`
button to invoke the function.
  "low": 10,
  "high": 100000000

Or invoke the deployed Lambda function from the AWS CLI:

bash$ aws lambda invoke --function-name count_primes_fast \
                    --payload "{\"low\": 10, \"high\": 100}" \
    "ExecutedVersion": "$LATEST",
    "StatusCode": 200
$ cat output.txt

Or from Julia:

julia> AWSLambda.invoke_lambda("count_primes_fast", low = 10, high = 100)

The examples above all pass the low and high arguments to the Lambda function using JSON. The invoke_jl_lambda function uses Julia's built-in serialization mechanism to pass arguments and return values as native Julia objects:

julia> AWSLambda.invoke_jl_lambda("count_primes_fast", 10, 100)
21 primes between 10 and 100.


Publish a Version with an Alias

julia> AWSLambda.lambda_publish_version("count_primes_fast", "PROD")
julia> AWSLambda.invoke_lambda("count_primes_fast:PROD", low = 10, high = 100)

Deploy a Lambda that depends on a Module

Create a local module TestModule/TestModule.jl...

module TestModule

export test_function


test_function(x) = x * x


Ensure that the module is locally precompiled:

push!(LOAD_PATH, "TestModule")
using TestModule

Use the module in a Lambda...

julia> AWSLambda.@deploy [
   :MemorySize => 1024,
   :Timeout => 30
] using TestModule function module_test(x)

           # Check that precompile cache is being used...
           @assert !Base.stale_cachefile("/var/task/TestModule/TestModule.jl",
                                         Base.LOAD_CACHE_PATH[1] * "/TestModule.ji")
           run(`ls -l $(Base.LOAD_CACHE_PATH[1])`)
           return test_function(x)

julia> AWSLambda.invoke_jl_lambda("module_test", 4)
total 8
-rw-r--r-- 1 slicer 497 2998 Apr 12 11:23 module_module_test.ji
-rw-r--r-- 1 slicer 497 1888 Apr 12 11:23 TestModule.ji


Deploy a custom jl_lambda_eval

The default jl_lambda_eval includes only a small set of Julia packages (run AWSLambda.lambda_module_cache() to see a list). If the packages that your project depends on are implemented in Julia they will be deployed to Lambda automatically by AWSLambda.@deploy using ... (see the using Primes example above). However, if your project uses a package that depends on a binary library, you will need to deploy a custom jl_lambda_eval that bundles the required libraries.

The example under docker/jl_lambda_custom demonstrates how to deploy a custom jl_lambda_eval. The REQUIRE file specifies required packages. In the example, the JuMP and Clp packages are listed along with some basic AWS interface packages.

From the docker/jl_lambda_custom directory, run make.jl to build and deploy the custom image:

bash$ julia make.jl build
Sending build context to Docker daemon  131.7MB
Successfully built 703da15825e2
Successfully tagged octech/jllambdaeval:0.6.2

bash$ julia make.jl zip
  adding: julia/ (stored 0%)

bash$ julia make.jl deploy
Creating Bucket "awslambda.jl.deploy.551613799374"...

After the custom image is deployed. Start a new Julia REPL and check that JuMP is now listed in AWSLambda.lambda_module_cache():

julia> using AWSLambda
julia> :JuMP in AWSLambda.lambda_module_cache()

Next, deploy a new Lambda function that uses Jump and Clp:

julia> using AWSLambda
julia> using JuMP, Clp

julia> AWSLambda.@deploy using JuMP, Clp function jump_example(x_max, y_max)
           m = Model(solver = ClpSolver())

           @variable(m, 0 <= x <= x_max)
           @variable(m, 0 <= y <= y_max)

           @objective(m, Max, 5x + 3y)
           @constraint(m, 1x + 5y <= 3.0)


           status = solve(m)

           println("Objective value: ", getobjectivevalue(m))
           println("x = ", getvalue(x))
           println("y = ", getvalue(y))
           return status

julia> AWSLambda.invoke_jl_lambda("jump_example", 2, 30)
Max 5 x + 3 y
Subject to
 x + 5 y ≤ 3
 0 ≤ x ≤ 2
 0 ≤ y ≤ 30
Objective value: 10.6
x = 2.0
y = 0.2


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