uint64_t delta, size;
int argument_parse_error;
+
+ bool follow;
+ bool discrete;
+
+ uint64_t n_fields;
+ bool n_fields_set;
} RequestMeta;
static const char* const mime_types[_OUTPUT_MODE_MAX] = {
[OUTPUT_SHORT] = "text/plain",
[OUTPUT_JSON] = "application/json",
- [OUTPUT_EXPORT] = "application/vnd.fdo.journal"
+ [OUTPUT_JSON_SSE] = "text/event-stream",
+ [OUTPUT_EXPORT] = "application/vnd.fdo.journal",
};
static RequestMeta *request_meta(void **connection_cls) {
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);
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;
m->tmp = tmpfile();
if (!m->tmp) {
log_error("Failed to create temporary file: %m");
- return MHD_CONTENT_READER_END_WITH_ERROR;;
+ return MHD_CONTENT_READER_END_WITH_ERROR;
}
}
RequestMeta *m,
struct MHD_Connection *connection) {
- const char *accept;
+ const char *header;
assert(m);
assert(connection);
- accept = MHD_lookup_connection_value(connection, MHD_HEADER_KIND, "Accept");
- if (!accept)
+ header = MHD_lookup_connection_value(connection, MHD_HEADER_KIND, "Accept");
+ if (!header)
return 0;
- if (streq(accept, mime_types[OUTPUT_JSON]))
+ if (streq(header, mime_types[OUTPUT_JSON]))
m->mode = OUTPUT_JSON;
- else if (streq(accept, mime_types[OUTPUT_EXPORT]))
+ else if (streq(header, mime_types[OUTPUT_JSON_SSE]))
+ m->mode = OUTPUT_JSON_SSE;
+ else if (streq(header, mime_types[OUTPUT_EXPORT]))
m->mode = OUTPUT_EXPORT;
else
m->mode = OUTPUT_SHORT;
colon2 = strchr(colon + 1, ':');
if (colon2) {
- char *t;
+ char _cleanup_free_ *t;
t = strndup(colon + 1, colon2 - colon - 1);
if (!t)
return -ENOMEM;
r = safe_atoi64(t, &m->n_skip);
- free(t);
if (r < 0)
return r;
}
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;
+ }
+
+ if (streq(key, "boot")) {
+ if (isempty(value))
+ r = true;
+ else {
+ r = parse_boolean(value);
+ if (r < 0) {
+ m->argument_parse_error = r;
+ return MHD_NO;
+ }
+ }
+
+ if (r) {
+ char match[9 + 32 + 1] = "_BOOT_ID=";
+ sd_id128_t bid;
+
+ r = sd_id128_get_boot(&bid);
+ if (r < 0) {
+ log_error("Failed to get boot ID: %s", strerror(-r));
+ return MHD_NO;
+ }
+
+ sd_id128_to_string(bid, match + 9);
+ r = sd_journal_add_match(m->journal, match, sizeof(match)-1);
+ if (r < 0) {
+ m->argument_parse_error = r;
+ return MHD_NO;
+ }
+ }
+
+ return MHD_YES;
+ }
+
p = strjoin(key, "=", strempty(value), NULL);
if (!p) {
m->argument_parse_error = log_oom();
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);
return r;
}
+static int output_field(FILE *f, OutputMode m, const char *d, size_t l) {
+ const char *eq;
+ size_t j;
+
+ eq = memchr(d, '=', l);
+ if (!eq)
+ return -EINVAL;
+
+ j = l - (eq - d + 1);
+
+ if (m == OUTPUT_JSON) {
+ fprintf(f, "{ \"%.*s\" : ", (int) (eq - d), d);
+ json_escape(f, eq+1, j, OUTPUT_FULL_WIDTH);
+ fputs(" }\n", f);
+ } else {
+ fwrite(eq+1, 1, j, f);
+ fputc('\n', f);
+ }
+
+ return 0;
+}
+
+static ssize_t request_reader_fields(
+ void *cls,
+ uint64_t pos,
+ char *buf,
+ size_t max) {
+
+ RequestMeta *m = cls;
+ int r;
+ size_t n, k;
+
+ assert(m);
+ assert(buf);
+ assert(max > 0);
+ assert(pos >= m->delta);
+
+ pos -= m->delta;
+
+ while (pos >= m->size) {
+ off_t sz;
+ const void *d;
+ size_t l;
+
+ /* End of this field, so let's serialize the next
+ * one */
+
+ if (m->n_fields_set &&
+ m->n_fields <= 0)
+ return MHD_CONTENT_READER_END_OF_STREAM;
+
+ r = sd_journal_enumerate_unique(m->journal, &d, &l);
+ if (r < 0) {
+ log_error("Failed to advance field index: %s", strerror(-r));
+ return MHD_CONTENT_READER_END_WITH_ERROR;
+ } else if (r == 0)
+ return MHD_CONTENT_READER_END_OF_STREAM;
+
+ pos -= m->size;
+ m->delta += m->size;
+
+ if (m->n_fields_set)
+ m->n_fields -= 1;
+
+ if (m->tmp)
+ rewind(m->tmp);
+ else {
+ m->tmp = tmpfile();
+ if (!m->tmp) {
+ log_error("Failed to create temporary file: %m");
+ return MHD_CONTENT_READER_END_WITH_ERROR;
+ }
+ }
+
+ r = output_field(m->tmp, m->mode, d, l);
+ if (r < 0) {
+ log_error("Failed to serialize item: %s", strerror(-r));
+ return MHD_CONTENT_READER_END_WITH_ERROR;
+ }
+
+ sz = ftello(m->tmp);
+ if (sz == (off_t) -1) {
+ log_error("Failed to retrieve file position: %m");
+ return MHD_CONTENT_READER_END_WITH_ERROR;
+ }
+
+ m->size = (uint64_t) sz;
+ }
+
+ if (fseeko(m->tmp, pos, SEEK_SET) < 0) {
+ log_error("Failed to seek to position: %m");
+ return MHD_CONTENT_READER_END_WITH_ERROR;
+ }
+
+ n = m->size - pos;
+ if (n > max)
+ n = max;
+
+ errno = 0;
+ k = fread(buf, 1, n, m->tmp);
+ if (k != n) {
+ log_error("Failed to read from file: %s", errno ? strerror(errno) : "Premature EOF");
+ return MHD_CONTENT_READER_END_WITH_ERROR;
+ }
+
+ return (ssize_t) k;
+}
+
+static int request_handler_fields(
+ struct MHD_Connection *connection,
+ const char *field,
+ void *connection_cls) {
+
+ struct MHD_Response *response;
+ RequestMeta *m;
+ int r;
+
+ assert(connection);
+ assert(connection_cls);
+
+ m = request_meta(connection_cls);
+ if (!m)
+ return respond_oom(connection);
+
+ r = open_journal(m);
+ if (r < 0)
+ return respond_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR, "Failed to open journal: %s\n", strerror(-r));
+
+ if (request_parse_accept(m, connection) < 0)
+ return respond_error(connection, MHD_HTTP_BAD_REQUEST, "Failed to parse Accept header.\n");
+
+ r = sd_journal_query_unique(m->journal, field);
+ if (r < 0)
+ return respond_error(connection, MHD_HTTP_BAD_REQUEST, "Failed to query unique fields.\n");
+
+ response = MHD_create_response_from_callback(MHD_SIZE_UNKNOWN, 4*1024, request_reader_fields, m, NULL);
+ if (!response)
+ return respond_oom(connection);
+
+ MHD_add_response_header(response, "Content-Type", mime_types[m->mode == OUTPUT_JSON ? OUTPUT_JSON : OUTPUT_SHORT]);
+
+ r = MHD_queue_response(connection, MHD_HTTP_OK, response);
+ MHD_destroy_response(response);
+
+ return r;
+}
+
static int request_handler_redirect(
struct MHD_Connection *connection,
const char *target) {
if (streq(url, "/entries"))
return request_handler_entries(connection, connection_cls);
+ if (startswith(url, "/fields/"))
+ return request_handler_fields(connection, url + 8, connection_cls);
+
if (streq(url, "/browse"))
return request_handler_file(connection, DOCUMENT_ROOT "/browse.html", "text/html");
}
int main(int argc, char *argv[]) {
- struct MHD_Daemon *daemon = NULL;
+ struct MHD_Daemon *d = NULL;
int r = EXIT_FAILURE, n;
if (argc > 1) {
goto finish;
}
- log_set_target(LOG_TARGET_KMSG);
+ log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
log_error("Can't listen on more than one socket.");
goto finish;
} else if (n > 0) {
- daemon = MHD_start_daemon(
+ d = MHD_start_daemon(
MHD_USE_THREAD_PER_CONNECTION|MHD_USE_POLL|MHD_USE_DEBUG,
19531,
NULL, NULL,
MHD_OPTION_NOTIFY_COMPLETED, request_meta_free, NULL,
MHD_OPTION_END);
} else {
- daemon = MHD_start_daemon(
+ d = MHD_start_daemon(
MHD_USE_DEBUG|MHD_USE_THREAD_PER_CONNECTION|MHD_USE_POLL,
19531,
NULL, NULL,
MHD_OPTION_END);
}
- if (!daemon) {
+ if (!d) {
log_error("Failed to start daemon!");
goto finish;
}
r = EXIT_SUCCESS;
finish:
- if (daemon)
- MHD_stop_daemon(daemon);
+ if (d)
+ MHD_stop_daemon(d);
return r;
}
~ianmdlvl / elogind.git / blobdiff