filevich · May 28, 2021 06:08 · May 28, 2021 · Jan 31, 2021
diff --git a/driver.py b/driver.py
@@ -0,0 +1,39 @@
+import subprocess
+
+cmd = ['./stub']
+proc = subprocess.Popen(
+        cmd,
+        stdin=subprocess.PIPE,
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE
+      )
+
+def consume(std, fn):
+  while True:
+    line = std.readline()
+    if not line:
+      break
+    fn(line)
+
+printer = lambda bs: print(b'-->' + bs)
+
+# To avoid deadlocks: careful to: add \n to output, flush output, use
+# readline() rather than read()
+proc.stdin.write(b'{"fruta": 33}\n')
+proc.stdin.flush()
+print(proc.stdout.readline())
+
+proc.stdin.write(b'{"fruta": 66}\n')
+proc.stdin.flush()
+print(proc.stdout.readline())
+
+proc.stdin.write(b'{"fruta": -1}\n')
+proc.stdin.flush()
+
+consume(proc.stderr, printer)
+
+consume(proc.stdout, printer)
+
+proc.stdin.close()
+proc.terminate()
+proc.wait(timeout=0.2)
diff --git a/stub.go b/stub.go
@@ -0,0 +1,35 @@
+package main
+
+/*
+go build stub.go
+*/
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"os"
+)
+
+type MedicalRecord struct {
+	Fruta int `json:"fruta"`
+}
+
+func main() {
+	var record MedicalRecord
+
+	for {
+		err := json.NewDecoder(os.Stdin).Decode(&record)
+		if err != nil {
+			log.Fatal(err)
+		} else {
+			fmt.Printf("ok: parsed %d\n", record.Fruta)
+			if record.Fruta == -1 {
+				fmt.Println("bye bye")
+				fmt.Fprintf(os.Stderr, "forbidden number: %d\n", record.Fruta)
+				fmt.Fprintf(os.Stderr, "yada yada\n")
+				return
+			}
+		}
+	}
+}