Merge branch 'master' of https://github.com/browngraphicslab/Dash-Web into pen

1 files changed, 44 insertions, 0 deletions

diff --git a/src/server/ProcessFactory.ts b/src/server/ProcessFactory.ts
new file mode 100644
index 000000000..acb8b3a99
--- /dev/null
+++ b/src/server/ProcessFactory.ts
@@ -0,0 +1,44 @@
+import { existsSync, mkdirSync } from "fs";
+import { pathFromRoot, fileDescriptorFromStream } from './ActionUtilities';
+import rimraf = require("rimraf");
+import { ChildProcess, spawn, StdioOptions } from "child_process";
+import { Stream } from "stream";
+
+export namespace ProcessFactory {
+
+    export type Sink = "pipe" | "ipc" | "ignore" | "inherit" | Stream | number | null | undefined;
+
+    export async function createWorker(command: string, args?: readonly string[], stdio?: StdioOptions | "logfile", detached = true): Promise<ChildProcess> {
+        if (stdio === "logfile") {
+            const log_fd = await Logger.create(command, args);
+            stdio = ["ignore", log_fd, log_fd];
+        }
+        const child = spawn(command, args, { detached, stdio });
+        child.unref();
+        return child;
+    }
+
+}
+
+export namespace Logger {
+
+    const logPath = pathFromRoot("./logs");
+
+    export async function initialize() {
+        if (existsSync(logPath)) {
+            if (!process.env.SPAWNED) {
+                await new Promise<any>(resolve => rimraf(logPath, resolve));
+            }
+        }
+        mkdirSync(logPath);
+    }
+
+    export async function create(command: string, args?: readonly string[]): Promise<number> {
+        return fileDescriptorFromStream(generate_log_path(command, args));
+    }
+
+    function generate_log_path(command: string, args?: readonly string[]) {
+        return pathFromRoot(`./logs/${command}-${args?.length}-${new Date().toUTCString()}.log`);
+    }
+
+}
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