fix(serverless-spoke): extend stdout buffer to avoid process being ki…

…lled (UMAprotocol#3857)

Signed-off-by: Matt Rice <[email protected]>

packages/serverless-orchestration/src/ServerlessSpoke.js

@@ -21,6 +21,11 @@ let customLogger;
 
 const waitForLoggerDelay = process.env.WAIT_FOR_LOGGER_DELAY || 5;
 
+// To be used with exec to override the default input output buffer size.
+// 1024 * 1024 is the default.
+// This is 1024 * 1024 * 8.
+const maxBuffer = 8388608;
+
 spoke.post("/", async (req, res) => {
   // Use a custom logger if provided. Otherwise, initialize a local logger.
   // Note: no reason to put this into the try-catch since a logger is required to throw the error.
@@ -95,7 +100,7 @@ function _execShellCommand(cmd, inputEnv, strategyRunnerSpoke = false) {
   return new Promise((resolve) => {
     const { stdout, stderr } = exec(
       cmd,
-      { env: { ...process.env, ...inputEnv }, stdio: "inherit" },
+      { env: { ...process.env, ...inputEnv }, stdio: "inherit", maxBuffer },
       (error, stdout, stderr) => {
         // The output from the process execution contains punctuation marks and escape chars that should be stripped.
         stdout = _stripExecStdout(stdout, strategyRunnerSpoke);