From 6668a7431d44d4c4fc463ab00c21300a7902d3da Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Thu, 23 Jun 2022 13:51:32 +0200
Subject: indexamajig: Add --asapo-wait-for-stream

---
 src/im-asapo.c    | 26 +++++++++++++++++++++++++-
 src/im-asapo.h    |  1 +
 src/indexamajig.c |  7 +++++++
 3 files changed, 33 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/im-asapo.c b/src/im-asapo.c
index b19c5bdc..255a942d 100644
--- a/src/im-asapo.c
+++ b/src/im-asapo.c
@@ -51,6 +51,7 @@ struct im_asapo
 	char *stream;
 	AsapoConsumerHandle consumer;
 	AsapoStringHandle group_id;
+	int wait_for_stream;
 };
 
 
@@ -110,11 +111,30 @@ struct im_asapo *im_asapo_connect(struct im_asapo_params *params)
 	a->stream = strdup(params->stream);
 	asapo_consumer_set_timeout(a->consumer, 3000);
 	a->group_id = asapo_string_from_c_str(params->group_id);
+	a->wait_for_stream = params->wait_for_stream;
 
 	return a;
 }
 
 
+static int stream_empty(struct im_asapo *a)
+{
+	AsapoErrorHandle err;
+
+	err = asapo_new_handle();
+	int64_t size = asapo_consumer_get_current_size(a->consumer, a->stream,
+	                                               &err);
+
+	if ( asapo_is_error(err) ) {
+		show_asapo_error("Couldn't get stream size", err);
+		asapo_free_handle(&err);
+		return 0;
+	}
+
+	return ( size == 0 );
+}
+
+
 void *im_asapo_fetch(struct im_asapo *a, size_t *pdata_size,
                      char **pmeta, char **pfilename, char **pevent,
                      int *pfinished)
@@ -141,7 +161,11 @@ void *im_asapo_fetch(struct im_asapo *a, size_t *pdata_size,
 		asapo_free_handle(&err);
 		asapo_free_handle(&meta);
 		asapo_free_handle(&data);
-		*pfinished = 1;
+		if ( stream_empty(a) && a->wait_for_stream ) {
+			*pfinished = 0;
+		} else {
+			*pfinished = 1;
+		}
 		return NULL;
 	}
 
diff --git a/src/im-asapo.h b/src/im-asapo.h
index f2e9e40a..cda9fbd9 100644
--- a/src/im-asapo.h
+++ b/src/im-asapo.h
@@ -42,6 +42,7 @@ struct im_asapo_params
 	char *group_id;
 	char *source;
 	char *stream;
+	int wait_for_stream;
 };
 
 #if defined(HAVE_ASAPO)
diff --git a/src/indexamajig.c b/src/indexamajig.c
index af1a5704..6e821434 100644
--- a/src/indexamajig.c
+++ b/src/indexamajig.c
@@ -435,6 +435,10 @@ static error_t parse_arg(int key, char *arg, struct argp_state *state)
 		args->asapo_params.stream = strdup(arg);
 		break;
 
+		case 221 :
+		args->asapo_params.wait_for_stream = 1;
+		break;
+
 		/* ---------- Peak search ---------- */
 
 		case 't' :
@@ -858,6 +862,7 @@ int main(int argc, char *argv[])
 	args.asapo_params.group_id = NULL;
 	args.asapo_params.source = NULL;
 	args.asapo_params.stream = NULL;
+	args.asapo_params.wait_for_stream = 0;
 	args.serial_start = 1;
 	args.if_peaks = 1;
 	args.if_multi = 0;
@@ -972,6 +977,8 @@ int main(int argc, char *argv[])
 		{"asapo-source", 218, "str", OPTION_NO_USAGE, "ASAP::O data source"},
 		{"data-format", 219, "str", OPTION_NO_USAGE, "Streamed data format"},
 		{"asapo-stream", 220, "str", OPTION_NO_USAGE, "ASAP::O stream name"},
+		{"asapo-wait-for-stream", 221, "str", OPTION_NO_USAGE,
+		        "Wait for ASAP::O stream to appear"},
 
 		{NULL, 0, 0, OPTION_DOC, "Peak search options:", 3},
 		{"peaks", 301, "method", 0, "Peak search method.  Default: zaef"},
-- 
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