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-rw-r--r--infrastructure/framework-src/modules/process.js91
1 files changed, 91 insertions, 0 deletions
diff --git a/infrastructure/framework-src/modules/process.js b/infrastructure/framework-src/modules/process.js
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+++ b/infrastructure/framework-src/modules/process.js
@@ -0,0 +1,91 @@
+/**
+ * Simple way to execute external commands through javascript
+ *
+ * @example
+ cmd = exec("cat");
+ System.out.println("First: " +cmd.write("this is a loop.").read(Process.READ_AVAILABLE)); // prints "this is a loop."
+ System.out.println("Second: " +cmd.writeAndClose(" hi there").result()); // prints "this is a loop. hi there"
+ *
+ */
+
+jimport("java.lang.Runtime");
+jimport("java.io.BufferedInputStream");
+jimport("java.io.BufferedOutputStream");
+jimport("java.lang.System");
+
+/* returns a process */
+function exec(process) {
+ return new Process(process);
+};
+
+function Process(cmd) {
+ this.cmd = cmd;
+ this.proc = Runtime.getRuntime().exec(cmd);
+ this.resultText = "";
+ this.inputStream = new BufferedInputStream(this.proc.getInputStream());
+ this.errorStream = new BufferedInputStream(this.proc.getErrorStream());
+ this.outputStream = new BufferedOutputStream(this.proc.getOutputStream());
+}
+
+Process.CHUNK_SIZE = 1024;
+Process.READ_ALL = -1;
+Process.READ_AVAILABLE = -2;
+
+Process.prototype.write = function(stdinText) {
+ this.outputStream.write(new java.lang.String(stdinText).getBytes());
+ this.outputStream.flush();
+ return this;
+};
+
+Process.prototype.writeAndClose = function(stdinText) {
+ this.write(stdinText);
+ this.outputStream.close();
+ return this;
+};
+
+/* Python file-like behavior: read specified number of bytes, else until EOF*/
+Process.prototype.read = function(nbytesToRead, stream) {
+ var inputStream = stream || this.inputStream;
+ var availBytes = inputStream.available();
+ if (!availBytes) return null;
+
+ var result = "";
+ var nbytes = nbytesToRead || Process.READ_ALL;
+ var readAll = (nbytes == Process.READ_ALL);
+ var readAvailable = (nbytes == Process.READ_AVAILABLE);
+ while (nbytes > 0 || readAll || readAvailable) {
+ var chunkSize = readAll ? Process.CHUNK_SIZE :
+ readAvailable ? Process.CHUNK_SIZE : nbytes;
+
+ // allocate a java byte array
+ var bytes = java.lang.reflect.Array.newInstance(java.lang.Byte.TYPE, chunkSize);
+
+ var len = inputStream.read(bytes, 0, chunkSize);
+
+ // at end of stream, or when we run out of data, stop reading in chunks.
+ if (len == -1) break;
+ if (nbytes > 0) nbytes -= len;
+
+ result += new java.lang.String(bytes);
+
+ if (readAvailable && inputStream.available() == 0) break;
+ }
+
+ this.resultText += new String(result);
+ return new String(result);
+};
+
+Process.prototype.result = function() {
+ this.outputStream.close();
+ this.proc.waitFor();
+ this.read(Process.READ_ALL, this.inputStream);
+ return new String(this.resultText);
+};
+
+Process.prototype.resultOrError = function() {
+ this.proc.waitFor();
+ this.read(Process.READ_ALL, this.inputStream);
+ var result = this.resultText;
+ if(!result || result == "") result = this.read(Process.READ_ALL, this.errorStream);
+ return result || "";
+};