From 38b5fba79e6626a0fa4869c0781271eaf7d12fdd Mon Sep 17 00:00:00 2001
From: Andrew Cady <d@jerkface.net>
Date: Sun, 3 Jun 2018 20:47:33 +0000
Subject: use /etc/dracos.conf to specify dracos server address

---
 Makefile                       |  3 +--
 dexcom_reader/dexcom_dumper.py | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index a319531..9f3242f 100644
--- a/Makefile
+++ b/Makefile
@@ -9,13 +9,12 @@ clean:
 	rm -f $(TARGETS)
 
 DEXCOM_READER_PATH=$(PWD)/dexcom_reader
-SERVICE_CMDLINE=$(DEXCOM_READER_PATH)/dexcom_dumper.py -v --poll --http=$(REMOTE_HOST)
+SERVICE_CMDLINE=$(DEXCOM_READER_PATH)/dexcom_dumper.py -v --poll --client
 
 install-rules: ModemManager.rules
 	install -m0644 ModemManager.rules /etc/udev/rules.d/77-mm-usb-device-blacklist.rules
 
 draco.service: draco.service.in
-	$(if $(REMOTE_HOST),,$(error "You must define $$REMOTE_HOST"))
 	sed -e "s?^\(ExecStart=\).*?\1$(SERVICE_CMDLINE)?" < $< > $@
 
 install-draco: draco.service
diff --git a/dexcom_reader/dexcom_dumper.py b/dexcom_reader/dexcom_dumper.py
index 3c60a88..bc6c5b0 100755
--- a/dexcom_reader/dexcom_dumper.py
+++ b/dexcom_reader/dexcom_dumper.py
@@ -4,6 +4,7 @@ import readdata
 import sys
 import json
 import traceback
+import subprocess
 from devicer import simple_devicer
 # import requests # As this takes SEVEN SECONDS, it's delayed until needed
 from sys import stdout, stderr
@@ -17,6 +18,13 @@ from optparse import OptionParser
 
 G5_IS_DEFAULT = True
 
+def get_dracos_host():
+	res = subprocess.check_output([
+		'sh',
+		'-c',
+		'[ -e /etc/dracos.conf ] && . /etc/dracos.conf && printf "%s" "$dracos_host" || true'])
+	return res.decode('utf-8')
+
 parser = OptionParser()
 parser.add_option("--g4", action="store_false", dest="g5", default=G5_IS_DEFAULT, help="use Dexcom G4 instead of Dexcom G5")
 parser.add_option("--g5", action="store_true",  dest="g5", default=G5_IS_DEFAULT, help="use Dexcom G5 instead of Dexcom G4")
@@ -31,6 +39,7 @@ parser.add_option("-v", "--verbose", action="store_true", dest="verbose", help="
 parser.add_option("-H", "--human", action="store_true", dest="human", help="print human-readable times")
 parser.add_option("-j", "--json", action="store_true", dest="json", help="print JSON output")
 parser.add_option("--http", type="string", dest="host", help="submit via HTTP")
+parser.add_option("--client", action="store_true", dest="client", help="act as client to dracos")
 
 (options, args) = parser.parse_args()
 
@@ -40,6 +49,14 @@ HUMAN = options.human
 JSON = options.json
 HOST = options.host
 
+if options.client and not HOST:
+	dracos_host = get_dracos_host()
+	if dracos_host:
+		HOST = "http://" + dracos_host
+	else:
+		raise ValueError("Option '--client' specified but 'dracos_host' not specified in '/etc/dracos.conf'")
+
+
 if command is 'dump_cgm' and options.num_records is None and not options.hours:
         options.hours = 2
 if options.num_records <= 0:
@@ -185,6 +202,8 @@ def poll_remote():
 
 def poll():
         print_verbose('Started dexcom_dumper.')
+	if HOST:
+		print_verbose("Acting as client to dracos server at " + HOST)
         poll_once = poll_remote if HOST else poll_stdout
 
         dexcom_g5_product = '22a3/47/100'
-- 
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