prservice: remove connection caching

This patch is a follow on of the the PR server rework in bitbake to add
read-only support.  The shift to using the bb.asyncrpc code in the PR
server and client brings issues with respect to reuse of the same
asyncio loop in different processes.  This patch removes the PR service
connection caching to avoid one source of this problem.  It is believed
that in practice this should have little impact on overall performance.

(From OE-Core rev: 0fc3055027e2a76ac863f1c0e0d52e95748066aa)

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/package.bbclass

@@ -714,9 +714,7 @@ python package_get_auto_pr() {
         return
 
     try:
-        conn = d.getVar("__PRSERV_CONN")
+        conn = oe.prservice.prserv_make_conn(d)
-        if conn is None:
-            conn = oe.prservice.prserv_make_conn(d)
         if conn is not None:
             if "AUTOINC" in pkgv:
                 srcpv = bb.fetch2.get_srcrev(d)
@@ -725,6 +723,7 @@ python package_get_auto_pr() {
                 d.setVar("PRSERV_PV_AUTOINC", str(value))
 
             auto_pr = conn.getPR(version, pkgarch, checksum)
+            conn.close()
     except Exception as e:
         bb.fatal("Can NOT get PRAUTO, exception %s" %  str(e))
     if auto_pr is None:

meta/lib/oe/prservice.py

@@ -11,7 +11,6 @@ def prserv_make_conn(d, check = False):
         if check:
             if not conn.ping():
                 raise Exception('service not available')
-        d.setVar("__PRSERV_CONN",conn)
     except Exception as exc:
         bb.fatal("Connecting to PR service %s:%s failed: %s" % (host_params[0], host_params[1], str(exc)))
 
@@ -22,31 +21,29 @@ def prserv_dump_db(d):
         bb.error("Not using network based PR service")
         return None
 
-    conn = d.getVar("__PRSERV_CONN")
+    conn = prserv_make_conn(d)
     if conn is None:
-        conn = prserv_make_conn(d)
+        bb.error("Making connection failed to remote PR service")
-        if conn is None:
+        return None
-            bb.error("Making connection failed to remote PR service")
-            return None
 
     #dump db
     opt_version = d.getVar('PRSERV_DUMPOPT_VERSION')
     opt_pkgarch = d.getVar('PRSERV_DUMPOPT_PKGARCH')
     opt_checksum = d.getVar('PRSERV_DUMPOPT_CHECKSUM')
     opt_col = ("1" == d.getVar('PRSERV_DUMPOPT_COL'))
-    return conn.export(opt_version, opt_pkgarch, opt_checksum, opt_col)
+    d = conn.export(opt_version, opt_pkgarch, opt_checksum, opt_col)
+    conn.close()
+    return d
 
 def prserv_import_db(d, filter_version=None, filter_pkgarch=None, filter_checksum=None):
     if not d.getVar('PRSERV_HOST'):
         bb.error("Not using network based PR service")
         return None
 
-    conn = d.getVar("__PRSERV_CONN")
+    conn = prserv_make_conn(d)
     if conn is None:
-        conn = prserv_make_conn(d)
+        bb.error("Making connection failed to remote PR service")
-        if conn is None:
+        return None
-            bb.error("Making connection failed to remote PR service")
-            return None
     #get the entry values
     imported = []
     prefix = "PRAUTO$"
@@ -70,6 +67,7 @@ def prserv_import_db(d, filter_version=None, filter_pkgarch=None, filter_checksu
                 bb.error("importing(%s,%s,%s,%d) failed. DB may have larger value %d" % (version,pkgarch,checksum,value,ret))
             else:
                imported.append((version,pkgarch,checksum,value))
+    conn.close()
     return imported
 
 def prserv_export_tofile(d, metainfo, datainfo, lockdown, nomax=False):
@@ -125,4 +123,5 @@ def prserv_check_avail(d):
     except TypeError:
         bb.fatal('Undefined/incorrect PRSERV_HOST value. Format: "host:port"')
     else:
-        prserv_make_conn(d, True)
+        conn = prserv_make_conn(d, True)
+        conn.close()