diff options
Diffstat (limited to 'src/journal/journal-gatewayd.c')
| -rw-r--r-- | src/journal/journal-gatewayd.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/src/journal/journal-gatewayd.c b/src/journal/journal-gatewayd.c index eea3530733..1d0559fdb6 100644 --- a/src/journal/journal-gatewayd.c +++ b/src/journal/journal-gatewayd.c @@ -50,6 +50,9 @@ typedef struct RequestMeta { bool follow; bool discrete; + + uint64_t n_fields; + bool n_fields_set; } RequestMeta; static const char* const mime_types[_OUTPUT_MODE_MAX] = { @@ -498,6 +501,153 @@ static int request_handler_entries( 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) { @@ -666,6 +816,9 @@ static int request_handler( 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"); |