Feature: Add configuration parameter for request body size

README.md

@@ -164,6 +164,7 @@ For more information on our configuration manager visit its readme [here](https:
 - `SAS_EXPRESS_BIND_HOST`: address on which the server will be listening, defaults to `127.0.0.1`.
 - `SAS_EXPRESS_PORT`: port on which the server will be listening, defaults to `8080`.
 - `SAS_EXPRESS_KEEP_ALIVE_TIMEOUT`: Set the `keepAliveTimeout` in express.
+- `SAS_EXPRESS_MAX_BODY`: Set the size of request body payload, defaults to `100kb`
 
 ### Substrate node
 

src/App.ts

@@ -14,8 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-import express from 'express';
-import { Application, ErrorRequestHandler, Request, RequestHandler, Response } from 'express';
+import express, { Application, ErrorRequestHandler, Request, RequestHandler, Response } from 'express';
 import { Server } from 'http';
 
 import packageJson from '../package.json';

src/SidecarConfig.ts

@@ -54,6 +54,7 @@ export class SidecarConfig {
 				HOST: config.Get(MODULES.EXPRESS, CONFIG.BIND_HOST) as string,
 				PORT: config.Get(MODULES.EXPRESS, CONFIG.PORT) as number,
 				KEEP_ALIVE_TIMEOUT: config.Get(MODULES.EXPRESS, CONFIG.KEEP_ALIVE_TIMEOUT) as number,
+				MAX_BODY: config.Get(MODULES.EXPRESS, CONFIG.MAX_BODY) as string,
 			},
 			SUBSTRATE: {
 				URL: config.Get(MODULES.SUBSTRATE, CONFIG.URL) as string,

src/Specs.ts

@@ -87,6 +87,14 @@ export class Specs {
 				type: 'number',
 			}),
 		);
+
+		this._specs.appendSpec(
+			MODULES.EXPRESS,
+			this._specs.getSpec(CONFIG.MAX_BODY, 'Max size of request payload body. It will default to 100kb.', {
+				default: '100kb',
+				type: 'string',
+			}),
+		);
 	}
 
 	/**

src/main.ts

@@ -65,7 +65,7 @@ async function main() {
 
 	startUpPrompt(config.SUBSTRATE.URL, chainName.toString(), implName.toString());
 
-	const preMiddlewares = [json(), middleware.httpLoggerCreate(logger)];
+	const preMiddlewares = [json({ limit: config.EXPRESS.MAX_BODY }), middleware.httpLoggerCreate(logger)];
 
 	if (config.METRICS.ENABLED) {
 		// Create Metrics App

src/types/sidecar-config/CONFIG.ts

@@ -41,4 +41,5 @@ export enum CONFIG {
 	PROM_HOST = 'PROM_HOST',
 	LOKI_PORT = 'LOKI_PORT',
 	INCLUDE_QUERYPARAMS = 'INCLUDE_QUERYPARAMS',
+	MAX_BODY = 'MAX_BODY',
 }

src/types/sidecar-config/SidecarConfig.ts

@@ -37,6 +37,7 @@ interface ISidecarConfigExpress {
 	HOST: string;
 	PORT: number;
 	KEEP_ALIVE_TIMEOUT: number;
+	MAX_BODY: string;
 }
 
 interface ISidecarConfigLog {