Remove bluebird and lodash (#21)

Author: domdomegg

index.js

@@ -1,5 +1,4 @@
 "use strict";
-const _ = require("lodash");
 const AWS = require("aws-sdk");
 const dynamodbLocal = require("aws-dynamodb-local");
 const seeder = require("./src/seeder");
@@ -11,11 +10,10 @@ class ServerlessDynamodbLocal {
         this.service = serverless.service;
         this.serverlessLog = serverless.cli.log.bind(serverless.cli);
         this.config = this.service.custom && this.service.custom['serverless-dynamodb'] || this.service.custom.dynamodb || {};
-        this.options = _.merge({
-          localPath: serverless.config && path.join(serverless.config.servicePath, '.dynamodb')
-          },
-          options
-        );
+        this.options = {
+            localPath: serverless.config && path.join(serverless.config.servicePath, '.dynamodb'),
+            ...options,
+        };
         this.provider = "aws";
         this.commands = {
             dynamodb: {
@@ -156,13 +154,11 @@ class ServerlessDynamodbLocal {
     }
 
     get port() {
-        const port = _.get(this.config, "start.port", 8000);
-        return port;
+        return this.config?.start?.port ?? 8000;
     }
 
     get host() {
-        const host = _.get(this.config, "start.host", "localhost");
-        return host;
+        return this.config?.start?.host ?? "localhost";
     }
 
     /**
@@ -254,13 +250,12 @@ class ServerlessDynamodbLocal {
 
     startHandler() {
         if (this.shouldExecute()) {
-            const options = _.merge({
-                    sharedDb: this.options.sharedDb || true,
-                    installPath: this.options.localPath
-                },
-                this.config.start,
-                this.options
-            );
+            const options = {
+                sharedDb: this.options.sharedDb ?? true,
+                installPath: this.options.localPath,
+                ...this.config.start,
+                ...this.options
+            }
 
             // otherwise endHandler will be mis-informed
             this.options = options;
@@ -288,19 +283,19 @@ class ServerlessDynamodbLocal {
     }
 
     getDefaultStack() {
-        return _.get(this.service, "resources");
+        return this.service.resources;
     }
 
     getAdditionalStacks() {
-        return _.values(_.get(this.service, "custom.additionalStacks", {}));
+        return Object.values(this.service.custom?.additionalStacks ?? {});
     }
 
     hasAdditionalStacksPlugin() {
-        return _.get(this.service, "plugins", []).includes("serverless-plugin-additional-stacks");
+        return (this.service.plugins ?? []).includes("serverless-plugin-additional-stacks");
     }
 
     getTableDefinitionsFromStack(stack) {
-        const resources = _.get(stack, "Resources", []);
+        const resources = stack.Resources ?? [];
         return Object.keys(resources).map((key) => {
             if (resources[key].Type === "AWS::DynamoDB::Table") {
                 return resources[key].Properties;
@@ -320,7 +315,7 @@ class ServerlessDynamodbLocal {
         }
 
         if (this.hasAdditionalStacksPlugin()) {
-            stacks = stacks.concat(this.getAdditionalStacks());
+            stacks.push(...this.getAdditionalStacks());
         }
 
         return stacks.map((stack) => this.getTableDefinitionsFromStack(stack)).reduce((tables, tablesInStack) => tables.concat(tablesInStack), []);
@@ -330,7 +325,7 @@ class ServerlessDynamodbLocal {
      * Gets the seeding sources
      */
     get seedSources() {
-        const seedConfig = _.get(this.config, "seed", {});
+        const seedConfig = this.config.seed ?? {};
         const seed = this.options.seed || this.config.start.seed || seedConfig;
         let categories;
         if (typeof seed === "string") {

package-lock.json

@@ -14,9 +14,7 @@
     },
     "dependencies": {
         "aws-dynamodb-local": "^0.0.11",
-        "aws-sdk": "^2.7.0",
-        "bluebird": "^3.4.6",
-        "lodash": "^4.17.0"
+        "aws-sdk": "^2.7.0"
     },
     "devDependencies": {
         "chai": "^4.1.1",

package.json

@@ -1,16 +1,11 @@
 "use strict";
-const BbPromise = require("bluebird");
-const _ = require("lodash");
-const path = require("path");
-const fs = require("fs");
+const path = require("node:path");
+const fs = require("node:fs");
 
 // DynamoDB has a 25 item limit in batch requests
 // https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_BatchWriteItem.html
 const MAX_MIGRATION_CHUNK = 25;
 
-// TODO: let this be configurable
-const MIGRATION_SEED_CONCURRENCY = 5;
-
 /**
  * Writes a batch chunk of migration seeds to DynamoDB. DynamoDB has a limit on the number of
  * items that may be written in a batch operation.
@@ -67,59 +62,36 @@ function writeSeeds(dynamodbWriteFunction, tableName, seeds) {
   }
 
   if (seeds.length > 0) {
-    const seedChunks = _.chunk(seeds, MAX_MIGRATION_CHUNK);
-    return BbPromise.map(
-      seedChunks,
-      (chunk) => writeSeedBatch(dynamodbWriteFunction, tableName, chunk),
-      { concurrency: MIGRATION_SEED_CONCURRENCY }
-    )
+    const seedChunks = chunk(seeds, MAX_MIGRATION_CHUNK);
+    return Promise.all(seedChunks.map((chunk) => writeSeedBatch(dynamodbWriteFunction, tableName, chunk)))
       .then(() => console.log("Seed running complete for table: " + tableName));
   }
 }
 
-/**
- * A promise-based function that determines if a file exists
- * @param {string} fileName The path to the file
- */
-function fileExists(fileName) {
-  return new Promise((resolve) => {
-    fs.exists(fileName, (exists) => resolve(exists));
-  });
-}
-
-/**
- * Transform all selerialized Buffer value in a Buffer value inside a json object
- *
- * @param {json} json with serialized Buffer value.
- * @return {json} json with Buffer object.
- */
-function unmarshalBuffer(json) {
-  _.forEach(json, function(value, key) {
-    // Null check to prevent creation of Buffer when value is null
-    if (value !== null && value.type==="Buffer") {
-      json[key]= new Buffer(value.data);
-    }
-  });
-  return json;
-}
+const chunk = (input, size) => {
+  return input.reduce((arr, item, idx) => {
+    return idx % size === 0
+      ? [...arr, [item]]
+      : [...arr.slice(0, -1), [...arr.slice(-1)[0], item]];
+  }, []);
+};
 
 /**
  * Scrapes seed files out of a given location. This file may contain
  * either a simple json object, or an array of simple json objects. An array
  * of json objects is returned.
  *
- * @param {any} location the filename to read seeds from.
+ * @param {string} location the filename to read seeds from.
+ * @returns {object[]} json
  */
 function getSeedsAtLocation(location) {
   // load the file as JSON
   const result = require(location);
 
   // Ensure the output is an array
-  if (Array.isArray(result)) {
-    return _.forEach(result, unmarshalBuffer);
-  } else {
-    return [ unmarshalBuffer(result) ];
-  }
+  const array = Array.isArray(result) ? result : [result];
+
+  return array;
 }
 
 /**
@@ -131,15 +103,12 @@ function locateSeeds(sources, cwd) {
   cwd = cwd || process.cwd();
 
   const locations = sources.map((source) => path.join(cwd, source));
-  return BbPromise.map(locations, (location) => {
-    return fileExists(location).then((exists) => {
-      if(!exists) {
-        throw new Error("source file " + location + " does not exist");
-      }
-      return getSeedsAtLocation(location);
-    });
-  // Smash the arrays together
-  }).then((seedArrays) => [].concat.apply([], seedArrays));
+  return locations.map((location) => {
+    if(!fs.existsSync(location)) {
+      throw new Error("source file " + location + " does not exist");
+    }
+    return getSeedsAtLocation(location);
+  }).flat(1);
 }
 
 module.exports = { writeSeeds, locateSeeds };