├── .github └── workflows │ └── test.yaml ├── .gitignore ├── LICENSE ├── README.md ├── deps.edn ├── example ├── deps.edn └── src │ └── stedi │ └── example.clj ├── src └── stedi │ ├── lambda.clj │ └── lambda │ ├── build.clj │ ├── compile.clj │ └── registry.clj └── test └── stedi └── lambda └── build_test.clj /.github/workflows/test.yaml: -------------------------------------------------------------------------------- 1 | on: [pull_request] 2 | jobs: 3 | lint: 4 | runs-on: ubuntu-latest 5 | steps: 6 | - uses: actions/checkout@v1 7 | - name: Install Clojure 8 | run: | 9 | curl -O https://download.clojure.org/install/linux-install-1.10.1.469.sh 10 | chmod +x linux-install-1.10.1.469.sh 11 | sudo ./linux-install-1.10.1.469.sh 12 | - name: Lint 13 | run: | 14 | clojure -A:lint 15 | 16 | test: 17 | runs-on: ubuntu-latest 18 | steps: 19 | - uses: actions/checkout@v1 20 | - name: Install Clojure 21 | run: | 22 | curl -O https://download.clojure.org/install/linux-install-1.10.1.469.sh 23 | chmod +x linux-install-1.10.1.469.sh 24 | sudo ./linux-install-1.10.1.469.sh 25 | - name: Build lambdas 26 | run: | 27 | cd example 28 | clojure -m stedi.lambda.build 29 | - name: Run tests 30 | run: | 31 | clojure -A:dev:test 32 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | **/.cpcache 2 | **/.nrepl-port 3 | **/target/** 4 | !**/target/**/ 5 | !**/target/**/.gitkeep 6 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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However, in accepting such obligations, You may act only 170 | on Your own behalf and on Your sole responsibility, not on behalf 171 | of any other Contributor, and only if You agree to indemnify, 172 | defend, and hold each Contributor harmless for any liability 173 | incurred by, or claims asserted against, such Contributor by reason 174 | of your accepting any such warranty or additional liability. 175 | 176 | END OF TERMS AND CONDITIONS 177 | 178 | Copyright 2019 Stedi, Inc. 179 | 180 | Licensed under the Apache License, Version 2.0 (the "License"); 181 | you may not use this file except in compliance with the License. 182 | You may obtain a copy of the License at 183 | 184 | http://www.apache.org/licenses/LICENSE-2.0 185 | 186 | Unless required by applicable law or agreed to in writing, software 187 | distributed under the License is distributed on an "AS IS" BASIS, 188 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 189 | See the License for the specific language governing permissions and 190 | limitations under the License. 191 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # stedi/lambda 2 | 3 | A Clojure CLI build tool to generate deployable [AWS Lambda][1] archives for 4 | Clojure projects. 5 | 6 | ## Installation 7 | 8 | This is only available through git deps right now: 9 | 10 | ``` clojure 11 | {:deps {stedi/lambda {:git/url "https://github.com/stediinc/lambda" 12 | :sha ""}}} 13 | ``` 14 | 15 | ## Getting Started 16 | 17 | `stedi/lambda` expects Lambda handlers to be declared with the 18 | `stedi.lambda/defentrypoint` macro. Using this macro will register a 19 | Lambda handler so the build tool knows what to compile. 20 | 21 | **Examples** 22 | 23 | ``` clojure 24 | (ns stedi.example 25 | (:require [clojure.java.io :as io] 26 | [clojure.data.json :as json] 27 | [stedi.lambda :refer [defentrypoint]])) 28 | 29 | (defentrypoint hello 30 | (fn [{:keys [input]}] 31 | ;; :input is a java.io.InputStream 32 | (let [who (slurp input)] 33 | ;; :output can be a String or anything coercible 34 | ;; by clojure.java.io/input-stream 35 | {:output (format "Hello, %s!" who)}))) 36 | 37 | (comment 38 | ;; You can invoke the fn defined by defentrypoint directly: 39 | (hello {:input (io/input-stream (.getBytes "you"))}) 40 | ;; => {:output "Hello, you!"} 41 | ) 42 | 43 | ;; You can wrap your functions in middleware. We recommend 44 | ;; that all middleware functions take a map with `:input` 45 | ;; and return a map with `:output`, and are limited to modifying 46 | ;; input and output 47 | 48 | (defn wrap-json-input 49 | "Example middleware to demonstrate middleware pattern with lambdas. " 50 | [handler] 51 | (fn [req] 52 | ;; :input of req is a java.io.InputStream 53 | (handler (-> req 54 | (update :input io/reader) 55 | (update :input #(json/read % :key-fn keyword)))))) 56 | 57 | (defn wrap-json-output 58 | "Example middleware to demonstrate middleware pattern with lambdas. " 59 | [handler] 60 | ;; :output can be a String or anything coercible 61 | ;; by `clojure.java.io/input-stream` 62 | (fn [req] (-> (handler req) 63 | (update :output json/write-str)))) 64 | 65 | ;; The handler fn still expects a map with :input and returns a map 66 | ;; with :output, but :input has been modified by the wrap-json-input 67 | ;; middleware function, and :output will be modified by the 68 | ;; wrap-json-output function. 69 | (defn hello-handler [{:keys [input]}] 70 | {:output {:greeting (format "Hello again, %s!" (:who input))}}) 71 | 72 | (defentrypoint hello-again 73 | (-> hello-handler 74 | wrap-json-input 75 | wrap-json-output)) 76 | 77 | (comment 78 | ;; You can invoke the fn defined by defentrypoint directly: 79 | (hello-again {:input (io/input-stream (.getBytes (json/json-str {:who "you"})))}) 80 | ;; => {:output "{\"greeting\":\"Hello again, you!\"}"} 81 | ) 82 | ``` 83 | 84 | **Building** 85 | 86 | ```bash 87 | clj -m stedi.lambda.build 88 | ``` 89 | 90 | This will generate jar files in the `target` directory that can be 91 | uploaded to AWS Lambda. 92 | 93 | **Configuration** 94 | 95 | In the AWS Lambda console, set the 96 | `Handler` to `stedi.lambda.Entrypoint::handler`. 97 | 98 | ## Philosophy 99 | 100 | `stedi/lambda` keeps dependencies to a minimum and provides a 101 | straightforward way to build all Lambdas for a project as separate 102 | archives (one per function). It structures the input to the Lambda as 103 | a [Ring][2]-like map with the intention that a rich ecosystem of 104 | middlewares can be built around it. 105 | 106 | [1]: https://aws.amazon.com/lambda/ 107 | [2]: https://github.com/ring-clojure/ring 108 | -------------------------------------------------------------------------------- /deps.edn: -------------------------------------------------------------------------------- 1 | {:paths ["src"] 2 | :deps {com.amazonaws/aws-lambda-java-core {:mvn/version "1.2.0"}} 3 | :aliases {:dev {:extra-paths ["test" "example" "example/target/lambda/stedi.example/hello.jar"] 4 | :extra-deps {com.cognitect/test-runner {:git/url "https://github.com/cognitect-labs/test-runner.git" 5 | :sha "cb96e80f6f3d3b307c59cbeb49bb0dcb3a2a780b"}}} 6 | :lint {:extra-deps {clj-kondo {:mvn/version "2019.09.22-alpha"}} 7 | :main-opts ["-m" "clj-kondo.main" "--lint" "."]} 8 | :test {:main-opts ["-m" "cognitect.test-runner"]}}} 9 | -------------------------------------------------------------------------------- /example/deps.edn: -------------------------------------------------------------------------------- 1 | {:paths ["src"] 2 | :deps {org.clojure/clojure {:mvn/version "1.10.1"} 3 | org.clojure/data.json {:mvn/version "0.2.6"} 4 | stedi/lambda {:local/root "../"}}} 5 | -------------------------------------------------------------------------------- /example/src/stedi/example.clj: -------------------------------------------------------------------------------- 1 | (ns stedi.example 2 | (:require [clojure.java.io :as io] 3 | [clojure.data.json :as json] 4 | [stedi.lambda :refer [defentrypoint]])) 5 | 6 | (defentrypoint hello 7 | (fn [{:keys [input]}] 8 | ;; :input is a java.io.InputStream 9 | (let [who (slurp input)] 10 | ;; :output can be a String or anything coercible 11 | ;; by clojure.java.io/input-stream 12 | {:output (format "Hello, %s!" who)}))) 13 | 14 | (comment 15 | ;; You can invoke the fn defined by defentrypoint directly: 16 | (hello {:input (io/input-stream (.getBytes "you"))}) 17 | ;; => {:output "Hello, you!"} 18 | ) 19 | 20 | ;; You can wrap your functions in middleware. We recommend 21 | ;; that all middleware functions take a map with `:input` 22 | ;; and return a map with `:output`, and are limited to modifying 23 | ;; input and output 24 | 25 | (defn wrap-json-input 26 | "Example middleware to demonstrate middleware pattern with lambdas. " 27 | [handler] 28 | (fn [req] 29 | ;; :input of req is a java.io.InputStream 30 | (handler (-> req 31 | (update :input io/reader) 32 | (update :input #(json/read % :key-fn keyword)))))) 33 | 34 | (defn wrap-json-output 35 | "Example middleware to demonstrate middleware pattern with lambdas. " 36 | [handler] 37 | ;; :output can be a String or anything coercible 38 | ;; by `clojure.java.io/input-stream` 39 | (fn [req] (-> (handler req) 40 | (update :output json/write-str)))) 41 | 42 | ;; The handler fn still expects a map with :input and returns a map 43 | ;; with :output, but :input has been modified by the wrap-json-input 44 | ;; middleware function, and :output will be modified by the 45 | ;; wrap-json-output function. 46 | (defn hello-handler [{:keys [input]}] 47 | {:output {:greeting (format "Hello again, %s!" (:who input))}}) 48 | 49 | (defentrypoint hello-again 50 | (-> hello-handler 51 | wrap-json-input 52 | wrap-json-output)) 53 | 54 | (comment 55 | ;; You can invoke the fn defined by defentrypoint directly: 56 | (hello-again {:input (io/input-stream (.getBytes (json/json-str {:who "you"})))}) 57 | ;; => {:output "{\"greeting\":\"Hello again, you!\"}"} 58 | ) 59 | -------------------------------------------------------------------------------- /src/stedi/lambda.clj: -------------------------------------------------------------------------------- 1 | (ns stedi.lambda 2 | (:require [clojure.java.io :as io])) 3 | 4 | (def ^{:doc "The name of the current endpoint being compiled by `stedi.lambda.compile`" 5 | :dynamic true} 6 | *compile-entrypoint* nil) 7 | 8 | (defn- make-lambda-entrypoint 9 | [handler-name] 10 | `(defn ~'-handler [is# os# context#] 11 | (let [output# (-> (~handler-name {:input is# 12 | :context context#}) 13 | (:output)) 14 | stream# (io/input-stream 15 | (if (string? output#) 16 | (.getBytes output#) 17 | output#))] 18 | (io/copy stream# os#)))) 19 | 20 | (defn- make-handler-function 21 | [name body] 22 | `(def ~name ~@body)) 23 | 24 | (defmacro defentrypoint 25 | "Defines a lambda entrypoint, its value should resolve to a function 26 | that takes a lambda request map and returns a lambda response map. 27 | 28 | Request Map: 29 | :input - an input stream of the payload 30 | :context - an instance of `com.amazonaws.services.lambda.runtime.Context` 31 | 32 | Response Map: 33 | :output - a String or anything coercible by `clojure.java.io/input-stream` 34 | to be returned as the response" 35 | [name & body] 36 | (let [entrypoint (str *ns* "/" name)] 37 | (if (= entrypoint *compile-entrypoint*) 38 | (do 39 | (println "[compiling]" entrypoint) 40 | `(do 41 | (gen-class 42 | :name stedi.lambda.Entrypoint 43 | :methods [^:static [~'handler 44 | [java.io.InputStream 45 | java.io.OutputStream 46 | com.amazonaws.services.lambda.runtime.Context] 47 | ~'void]]) 48 | ~(make-handler-function name body) 49 | ~(make-lambda-entrypoint name))) 50 | (do 51 | (when-not *compile-files* 52 | (require 'stedi.lambda.registry) 53 | (let [add-lambda (requiring-resolve 'stedi.lambda.registry/add-entrypoint)] 54 | (add-lambda entrypoint))) 55 | (make-handler-function name body))))) 56 | -------------------------------------------------------------------------------- /src/stedi/lambda/build.clj: -------------------------------------------------------------------------------- 1 | (ns stedi.lambda.build 2 | "Analyzes project paths, compiles lambda functions classes and bundles 3 | classes with their dependencies." 4 | (:require [clojure.java.io :as io] 5 | [clojure.java.shell :as sh] 6 | [stedi.lambda.registry :as registry] 7 | [stedi.lambda.compile :as compile])) 8 | 9 | (def ^:private build-deps 10 | '{:deps {pack/pack.alpha 11 | {:git/url "https://github.com/juxt/pack.alpha.git" 12 | :sha "2769a6224bfb938e777906ea311b3daf7d2220f5"}}}) 13 | 14 | (defn- compile-args 15 | [entrypoint] 16 | ["clojure" 17 | "-m" "stedi.lambda.compile" 18 | entrypoint]) 19 | 20 | (defn- pack-args 21 | [classes target-zip] 22 | ["clojure" 23 | "-Sdeps" (pr-str build-deps) 24 | "-m" "mach.pack.alpha.aws-lambda" 25 | "-e" classes 26 | target-zip]) 27 | 28 | (defn- wrap-debug 29 | [f] 30 | (fn [input] 31 | (let [result (f input)] 32 | (when (System/getenv "DEBUG") 33 | (println "[debug]" (pr-str result))) 34 | result))) 35 | 36 | (defn- wrap-describe 37 | [f] 38 | (fn [input] 39 | (apply println "[running]" (:args input)) 40 | (let [{:keys [err out] :as result} (f input)] 41 | (when (or out err) (println)) 42 | (when (not-empty out) (println out)) 43 | (when (not-empty err) (println err)) 44 | result))) 45 | 46 | (defn- wrap-throw-on-nonzero 47 | [f] 48 | (fn [input] 49 | (let [result (f input)] 50 | (when-not (= 0 (:exit result)) 51 | (throw (ex-info "Command failed" 52 | {:input input 53 | :result result})))))) 54 | 55 | (def ^:private shell 56 | (-> (fn [{:keys [args]}] (apply sh/sh args)) 57 | (wrap-describe) 58 | (wrap-debug) 59 | (wrap-throw-on-nonzero))) 60 | 61 | (defn- deps 62 | [] 63 | (-> (slurp "deps.edn") 64 | (read-string))) 65 | 66 | (defn- project-paths 67 | [] 68 | (-> (deps) 69 | (:paths))) 70 | 71 | (defn target-zip 72 | [entrypoint] 73 | (str "target/lambda/" entrypoint ".jar")) 74 | 75 | (defn- bundle 76 | [entrypoint] 77 | (let [classes (compile/target-dir entrypoint) 78 | target-zip (target-zip entrypoint)] 79 | (io/make-parents target-zip) 80 | (shell {:args (compile-args entrypoint)}) 81 | (shell {:args (pack-args classes target-zip)}))) 82 | 83 | (defn- bundle-all 84 | [] 85 | (let [paths (project-paths)] 86 | (doseq [entrypoint (registry/find-entrypoints paths)] 87 | (bundle entrypoint)))) 88 | 89 | (defn -main [& [entrypoint]] 90 | (when-not (get-in (deps) [:deps 'stedi/lambda]) 91 | (throw (Exception. "Could not find stedi/lambda in :deps, did you forget to include it?"))) 92 | (if entrypoint 93 | (bundle entrypoint) 94 | (bundle-all)) 95 | (shutdown-agents)) 96 | -------------------------------------------------------------------------------- /src/stedi/lambda/compile.clj: -------------------------------------------------------------------------------- 1 | (ns stedi.lambda.compile 2 | "Wrapper to `clojure.core/compile` that dynamically binds 3 | `stedi.lambda/*compile-entrypoint*` such that only one lambda 4 | function gets compiled. See `stedi.lambda/defentrypoint` for more 5 | information." 6 | (:require [clojure.java.io :as io] 7 | [stedi.lambda :as lambda]) 8 | (:refer-clojure :exclude [compile])) 9 | 10 | (defn target-dir [entrypoint] 11 | (str "target/lambda/" entrypoint "/classes")) 12 | 13 | (defn compile [entrypoint] 14 | (let [target (target-dir entrypoint) 15 | sym (symbol entrypoint)] 16 | (io/make-parents (str target "/.")) 17 | (binding [lambda/*compile-entrypoint* entrypoint 18 | *compile-path* target] 19 | (clojure.core/compile (symbol (namespace sym)))))) 20 | 21 | (defn -main [entrypoint] 22 | (compile entrypoint)) 23 | -------------------------------------------------------------------------------- /src/stedi/lambda/registry.clj: -------------------------------------------------------------------------------- 1 | (ns stedi.lambda.registry 2 | "A registry to track loaded lambda entrypoints." 3 | (:require [clojure.java.io :as io])) 4 | 5 | (def ^:private ^:dynamic *registry* nil) 6 | 7 | (defn add-entrypoint 8 | "Adds lambda entrypoint to registry." 9 | [entrypoint] 10 | (when *registry* 11 | (swap! *registry* conj entrypoint))) 12 | 13 | (defn find-entrypoints 14 | [paths] 15 | (binding [*registry* (atom #{})] 16 | (let [files (->> paths 17 | (mapcat (comp file-seq io/file)) 18 | (map str) 19 | (filter #(.endsWith % ".clj")))] 20 | (doseq [file files] 21 | (println "[analyze] Checking for lambdas in" file) 22 | (load-file file)) 23 | (let [found @*registry*] 24 | (println "[analyze] Found entrypoints" (pr-str found)) 25 | found)))) 26 | -------------------------------------------------------------------------------- /test/stedi/lambda/build_test.clj: -------------------------------------------------------------------------------- 1 | (ns stedi.lambda.build-test 2 | (:require [clojure.java.io :as io] 3 | [clojure.test :refer [deftest testing is]]) 4 | (:import [java.io ByteArrayOutputStream])) 5 | 6 | ;; Note: you have to run `clojure -m stedi.lambda.build` in the `./example` directory 7 | ;; before running these tests. These tests run against the artifacts generated by that 8 | ;; command. 9 | (deftest build-test 10 | (testing "correct jars are built" 11 | (is (.exists (io/file "./example/target/lambda/stedi.example/hello.jar"))) 12 | (is (.exists (io/file "./example/target/lambda/stedi.example/hello-again.jar")))) 13 | 14 | (testing "entrypoint is invokable" 15 | ;; This is gross but the classes we want to test aren't available 16 | ;; until this test runs so `import` will fail if we don't wait and dynamically eval 17 | (let [output (eval `(do 18 | (with-open [is# (io/input-stream (.getBytes "world")) 19 | os# (ByteArrayOutputStream.)] 20 | (import '[stedi.lambda ~'Entrypoint]) 21 | (stedi.lambda.Entrypoint/handler is# os# nil) 22 | (str os#))))] 23 | (is (= "Hello, world!" output))))) 24 | --------------------------------------------------------------------------------