logs: add pressure acquisition script

logs/README.md

@@ -12,4 +12,6 @@ Measurement: pressure
 
 Pumpdown curve: elapsed (seconds, float) and mbar.
 
+To acquire: `python3 acquire.py` and give it a tag/comment to stdin. Then press the pumpdown button or turn the scope on.
+
 Elapsed is 0 at the moment the script detected a pumpdown event.

logs/acquire-pressure.py

@@ -0,0 +1,59 @@
+import requests
+import time
+from datetime import datetime
+import glob
+
+tags = set()
+for p in glob.glob("pressure-*.csv"):
+    p = p.rstrip('.csv')
+    parts = p.split('-', maxsplit=4)
+    tags.add(parts[4])
+print('Existing tags:', ', '.join(list(tags)))
+tag = input("Tag? ")
+
+def metrics():
+    r = requests.get('http://succbone.lab.fa-fo.de/metrics').text
+    res = {}
+    for line in r.split('\n'):
+        if '#' in line:
+            line = line[:line.index('#')]
+        line = line.strip()
+        if not line:
+            continue
+        a, b = line.split(' ')
+        a = a.strip()
+        b = b.strip()
+        res[a] = float(b)
+    return res
+
+
+f = None
+prev = None
+logging = None
+buffer = []
+while True:
+    time.sleep(0.1)
+    m = metrics()
+    v = m['sem_pressure_mbar']
+    if logging is None:
+        if v < 800 and (prev is None or prev >= 800):
+            logging = time.time()
+            print('Starting log...')
+            f = open(f'pressure-{datetime.now().isoformat()}-{tag}.csv', 'w')
+            f.write('elapsed\tmbar\n')
+            for t, v in buffer:
+                f.write(f'{t-logging}\t{v}\n')
+        else:
+            buffer.append((time.time(), v))
+    else:
+        if v > 800:
+            print('Vented')
+            break
+
+    prev = v
+    if logging is not None:
+        elapsed = time.time() - logging
+        print(elapsed, m['sem_pressure_mbar'])
+        f.write(f'{elapsed}\t{v}\n')
+    else:
+        print('waiting', m['sem_pressure_mbar'])