lib-http: Add http_client_get_global_context()

src/lib-http/http-client.c

@@ -87,6 +87,8 @@
 
  */
 
+static struct http_client_context *http_client_global_context = NULL;
+
 /*
  * Client
  */
@@ -533,3 +535,21 @@ void http_client_context_switch_ioloop(struct http_client_context *cctx)
 		hshared = hshared->next)
 		http_client_host_shared_switch_ioloop(hshared);
 }
+
+static void http_client_global_context_free(void)
+{
+	http_client_context_unref(&http_client_global_context);
+}
+
+struct http_client_context *http_client_get_global_context(void)
+{
+	if (http_client_global_context != NULL)
+		return http_client_global_context;
+
+	struct http_client_settings set;
+	i_zero(&set);
+	http_client_global_context = http_client_context_create(&set);
+	/* keep this a bit higher than lib-ssl-iostream */
+	lib_atexit_priority(http_client_global_context_free, LIB_ATEXIT_PRIORITY_LOW-1);
+	return http_client_global_context;
+}

src/lib-http/http-client.h

@@ -448,4 +448,9 @@ http_client_context_create(const struct http_client_settings *set);
 void http_client_context_ref(struct http_client_context *cctx);
 void http_client_context_unref(struct http_client_context **_cctx);
 
+/* Return the default global shared client context, creating it if necessary.
+   The context is freed automatically at exit. Don't unreference the
+   returned context. */
+struct http_client_context *http_client_get_global_context(void);
+
 #endif