Add channel events for res_stasis apps

This change adds a framework in res_stasis for handling events from
channel topics. JSON event generation and validation code is created
from event documentation in rest-api/api-docs/events.json to assist in
JSON event generation, ensure consistency, and ensure that accurate
documentation is available for ALL events that are received by
res_stasis applications.

The userevent application has been refactored along with the code that
handles userevent channel blob events to pass the headers as key/value
pairs in the JSON blob. As a side-effect, app_userevent now handles
duplicate keys by overwriting the previous value.

Review: https://reviewboard.asterisk.org/r/2428/
(closes issue ASTERISK-21180)
Patch-By: Kinsey Moore <kmoore@digium.com>


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@388275 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 31 insertions, 0 deletions

diff --git a/main/stasis_channels.c b/main/stasis_channels.c
index c032ec956..acae81939 100644
--- a/main/stasis_channels.c
+++ b/main/stasis_channels.c
@@ -448,6 +448,37 @@ struct ast_json *ast_channel_snapshot_to_json(const struct ast_channel_snapshot
 	return ast_json_ref(json_chan);
 }
 
+int ast_channel_snapshot_cep_equal(
+	const struct ast_channel_snapshot *old_snapshot,
+	const struct ast_channel_snapshot *new_snapshot)
+{
+	ast_assert(old_snapshot != NULL);
+	ast_assert(new_snapshot != NULL);
+
+	/* We actually get some snapshots with CEP set, but before the
+	 * application is set. Since empty application is invalid, we treat
+	 * setting the application from nothing as a CEP change.
+	 */
+	if (ast_strlen_zero(old_snapshot->appl) &&
+	    !ast_strlen_zero(new_snapshot->appl)) {
+		return 0;
+	}
+
+	return old_snapshot->priority == new_snapshot->priority &&
+		strcmp(old_snapshot->context, new_snapshot->context) == 0 &&
+		strcmp(old_snapshot->exten, new_snapshot->exten) == 0;
+}
+
+int ast_channel_snapshot_caller_id_equal(
+	const struct ast_channel_snapshot *old_snapshot,
+	const struct ast_channel_snapshot *new_snapshot)
+{
+	ast_assert(old_snapshot != NULL);
+	ast_assert(new_snapshot != NULL);
+	return strcmp(old_snapshot->caller_number, new_snapshot->caller_number) == 0 &&
+		strcmp(old_snapshot->caller_name, new_snapshot->caller_name) == 0;
+}
+
 void ast_stasis_channels_shutdown(void)
 {
 	STASIS_MESSAGE_TYPE_CLEANUP(ast_channel_snapshot_type);