journal: when browsing the journal via browse.html allow clicking on entries to show...

[elogind.git] / src / journal / journal-gatewayd.c

diff --git a/src/journal/journal-gatewayd.c b/src/journal/journal-gatewayd.c
index 9599e891daf34db930f7b8b7772bc8bbf7baf14c..33dda266b6a31f049a1e286889fc64db5e427126 100644 (file)
--- a/src/journal/journal-gatewayd.c
+++ b/src/journal/journal-gatewayd.c
@@ -47,6 +47,9 @@ typedef struct RequestMeta {
         uint64_t delta, size;
 
         int argument_parse_error;
+
+        bool follow;
+        bool discrete;
 } RequestMeta;
 
 static const char* const mime_types[_OUTPUT_MODE_MAX] = {
@@ -178,15 +181,9 @@ static ssize_t request_reader_entries(
                     m->n_entries <= 0)
                         return MHD_CONTENT_READER_END_OF_STREAM;
 
-                if (m->n_skip < 0) {
-                        r = sd_journal_previous_skip(m->journal, (uint64_t) -m->n_skip);
-
-                        /* We couldn't seek this far backwards? Then
-                         * let's try to look forward... */
-                        if (r == 0)
-                                r = sd_journal_next(m->journal);
-
-                } else if (m->n_skip > 0)
+                if (m->n_skip < 0)
+                        r = sd_journal_previous_skip(m->journal, (uint64_t) -m->n_skip + 1);
+                else if (m->n_skip > 0)
                         r = sd_journal_next_skip(m->journal, (uint64_t) m->n_skip + 1);
                 else
                         r = sd_journal_next(m->journal);
@@ -194,8 +191,33 @@ static ssize_t request_reader_entries(
                 if (r < 0) {
                         log_error("Failed to advance journal pointer: %s", strerror(-r));
                         return MHD_CONTENT_READER_END_WITH_ERROR;
-                } else if (r == 0)
+                } else if (r == 0) {
+
+                        if (m->follow) {
+                                r = sd_journal_wait(m->journal, (uint64_t) -1);
+                                if (r < 0) {
+                                        log_error("Couldn't wait for journal event: %s", strerror(-r));
+                                        return MHD_CONTENT_READER_END_WITH_ERROR;
+                                }
+
+                                continue;
+                        }
+
                         return MHD_CONTENT_READER_END_OF_STREAM;
+                }
+
+                if (m->discrete) {
+                        assert(m->cursor);
+
+                        r = sd_journal_test_cursor(m->journal, m->cursor);
+                        if (r < 0) {
+                                log_error("Failed to test cursor: %s", strerror(-r));
+                                return MHD_CONTENT_READER_END_WITH_ERROR;
+                        }
+
+                        if (r == 0)
+                                return MHD_CONTENT_READER_END_OF_STREAM;
+                }
 
                 pos -= m->size;
                 m->delta += m->size;
@@ -356,6 +378,38 @@ static int request_parse_arguments_iterator(
                 return MHD_NO;
         }
 
+        if (streq(key, "follow")) {
+                if (isempty(value)) {
+                        m->follow = true;
+                        return MHD_YES;
+                }
+
+                r = parse_boolean(value);
+                if (r < 0) {
+                        m->argument_parse_error = r;
+                        return MHD_NO;
+                }
+
+                m->follow = r;
+                return MHD_YES;
+        }
+
+        if (streq(key, "discrete")) {
+                if (isempty(value)) {
+                        m->discrete = true;
+                        return MHD_YES;
+                }
+
+                r = parse_boolean(value);
+                if (r < 0) {
+                        m->argument_parse_error = r;
+                        return MHD_NO;
+                }
+
+                m->discrete = r;
+                return MHD_YES;
+        }
+
         p = strjoin(key, "=", strempty(value), NULL);
         if (!p) {
                 m->argument_parse_error = log_oom();
@@ -412,12 +466,13 @@ static int request_handler_entries(
         if (request_parse_arguments(m, connection) < 0)
                 return respond_error(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse URL arguments.\n");
 
-        /* log_info("cursor = %s", m->cursor); */
-        /* log_info("skip = %lli", m->n_skip); */
-        /* if (!m->n_entries_set) */
-        /*         log_info("n_entries not set!"); */
-        /* else */
-        /*         log_info("n_entries = %llu", m->n_entries); */
+        if (m->discrete) {
+                if (!m->cursor)
+                        return respond_error(connection, MHD_HTTP_BAD_REQUEST, "Discrete seeks require a cursor specification.\n");
+
+                m->n_entries = 1;
+                m->n_entries_set = true;
+        }
 
         if (m->cursor)
                 r = sd_journal_seek_cursor(m->journal, m->cursor);
@@ -626,7 +681,7 @@ int main(int argc, char *argv[]) {
                 goto finish;
         }
 
-        log_set_target(LOG_TARGET_KMSG);
+        log_set_target(LOG_TARGET_AUTO);
         log_parse_environment();
         log_open();