diff options
Diffstat (limited to 'logview/logview-log.c')
| -rw-r--r-- | logview/logview-log.c | 930 |
1 files changed, 930 insertions, 0 deletions
diff --git a/logview/logview-log.c b/logview/logview-log.c new file mode 100644 index 00000000..2f752b02 --- /dev/null +++ b/logview/logview-log.c @@ -0,0 +1,930 @@ +/* -*- Mode: C; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */ +/* logview-log.c - object representation of a logfile + * + * Copyright (C) 1998 Cesar Miquel <[email protected]> + * Copyright (C) 2008 Cosimo Cecchi <[email protected]> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 551 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + * USA. + */ + +#include "config.h" + +#include <glib.h> +#include <glib/gi18n.h> +#include <gio/gio.h> + +#ifdef HAVE_ZLIB +#include <zlib.h> +#endif + +#include "logview-log.h" +#include "logview-utils.h" + +G_DEFINE_TYPE (LogviewLog, logview_log, G_TYPE_OBJECT); + +#define GET_PRIVATE(o) \ + (G_TYPE_INSTANCE_GET_PRIVATE ((o), LOGVIEW_TYPE_LOG, LogviewLogPrivate)) + +enum { + LOG_CHANGED, + LAST_SIGNAL +}; + +static guint signals [LAST_SIGNAL] = { 0 }; + +struct _LogviewLogPrivate { + /* file and monitor */ + GFile *file; + GFileMonitor *mon; + + /* stats about the file */ + time_t file_time; + goffset file_size; + char *display_name; + gboolean has_days; + + /* lines and relative days */ + GSList *days; + GPtrArray *lines; + guint lines_no; + + /* stream poiting to the log */ + GDataInputStream *stream; + gboolean has_new_lines; +}; + +typedef struct { + LogviewLog *log; + GError *err; + LogviewCreateCallback callback; + gpointer user_data; +} LoadJob; + +typedef struct { + LogviewLog *log; + GError *err; + const char **lines; + GSList *new_days; + LogviewNewLinesCallback callback; + gpointer user_data; +} NewLinesJob; + +typedef struct { + GInputStream *parent_str; + guchar * buffer; + GFile *file; + + gboolean last_str_result; + int last_z_result; + z_stream zstream; +} GZHandle; + +static void +do_finalize (GObject *obj) +{ + LogviewLog *log = LOGVIEW_LOG (obj); + char ** lines; + + if (log->priv->stream) { + g_object_unref (log->priv->stream); + log->priv->stream = NULL; + } + + if (log->priv->file) { + g_object_unref (log->priv->file); + log->priv->file = NULL; + } + + if (log->priv->mon) { + g_object_unref (log->priv->mon); + log->priv->mon = NULL; + } + + if (log->priv->days) { + g_slist_foreach (log->priv->days, + (GFunc) logview_utils_day_free, NULL); + g_slist_free (log->priv->days); + log->priv->days = NULL; + } + + if (log->priv->lines) { + lines = (char **) g_ptr_array_free (log->priv->lines, FALSE); + g_strfreev (lines); + log->priv->lines = NULL; + } + + G_OBJECT_CLASS (logview_log_parent_class)->finalize (obj); +} + +static void +logview_log_class_init (LogviewLogClass *klass) +{ + GObjectClass *object_class = G_OBJECT_CLASS (klass); + + object_class->finalize = do_finalize; + + signals[LOG_CHANGED] = g_signal_new ("log-changed", + G_OBJECT_CLASS_TYPE (object_class), + G_SIGNAL_RUN_LAST, + G_STRUCT_OFFSET (LogviewLogClass, log_changed), + NULL, NULL, + g_cclosure_marshal_VOID__VOID, + G_TYPE_NONE, 0); + + g_type_class_add_private (klass, sizeof (LogviewLogPrivate)); +} + +static void +logview_log_init (LogviewLog *self) +{ + self->priv = GET_PRIVATE (self); + + self->priv->lines = NULL; + self->priv->lines_no = 0; + self->priv->days = NULL; + self->priv->file = NULL; + self->priv->mon = NULL; + self->priv->has_new_lines = FALSE; + self->priv->has_days = FALSE; +} + +static void +monitor_changed_cb (GFileMonitor *monitor, + GFile *file, + GFile *unused, + GFileMonitorEvent event, + gpointer user_data) +{ + LogviewLog *log = user_data; + + if (event == G_FILE_MONITOR_EVENT_CHANGED) { + log->priv->has_new_lines = TRUE; + g_signal_emit (log, signals[LOG_CHANGED], 0, NULL); + } + /* TODO: handle the case where the log is deleted? */ +} + +static void +setup_file_monitor (LogviewLog *log) +{ + GError *err = NULL; + + log->priv->mon = g_file_monitor (log->priv->file, + 0, NULL, &err); + if (err) { + /* it'd be strange to get this error at this point but whatever */ + g_warning ("Impossible to monitor the log file: the changes won't be notified"); + g_error_free (err); + return; + } + + /* set the rate to 1sec, as I guess it's not unusual to have more than + * one line written consequently or in a short time, being a log file. + */ + g_file_monitor_set_rate_limit (log->priv->mon, 1000); + g_signal_connect (log->priv->mon, "changed", + G_CALLBACK (monitor_changed_cb), log); +} + +static GSList * +add_new_days_to_cache (LogviewLog *log, const char **new_lines, guint lines_offset) +{ + GSList *new_days, *l, *last_cached; + int res; + Day *day, *last; + + new_days = log_read_dates (new_lines, log->priv->file_time); + + /* the days are stored in chronological order, so we compare the last cached + * one with the new we got. + */ + last_cached = g_slist_last (log->priv->days); + + if (!last_cached) { + /* this means the day list is empty (i.e. we're on the first read */ + log->priv->days = logview_utils_day_list_copy (new_days); + return new_days; + } + + for (l = new_days; l; l = l->next) { + res = days_compare (l->data, last_cached->data); + day = l->data; + + if (res > 0) { + /* this day in the list is newer than the last one, append to + * the cache. + */ + day->first_line += lines_offset; + day->last_line += lines_offset; + log->priv->days = g_slist_append (log->priv->days, logview_utils_day_copy (day)); + } else if (res == 0) { + last = last_cached->data; + + /* update the lines number */ + last->last_line += day->last_line; + } + } + + return new_days; +} + +static gboolean +new_lines_job_done (gpointer data) +{ + NewLinesJob *job = data; + + if (job->err) { + job->callback (job->log, NULL, NULL, job->err, job->user_data); + g_error_free (job->err); + } else { + job->callback (job->log, job->lines, job->new_days, job->err, job->user_data); + } + + g_slist_foreach (job->new_days, (GFunc) logview_utils_day_free, NULL); + g_slist_free (job->new_days); + + /* drop the reference we acquired before */ + g_object_unref (job->log); + + g_slice_free (NewLinesJob, job); + + return FALSE; +} + +static gboolean +do_read_new_lines (GIOSchedulerJob *io_job, + GCancellable *cancellable, + gpointer user_data) +{ + /* this runs in a separate thread */ + NewLinesJob *job = user_data; + LogviewLog *log = job->log; + char *line; + GError *err = NULL; + GPtrArray *lines; + + g_assert (LOGVIEW_IS_LOG (log)); + g_assert (log->priv->stream != NULL); + + if (!log->priv->lines) { + log->priv->lines = g_ptr_array_new (); + g_ptr_array_add (log->priv->lines, NULL); + } + + lines = log->priv->lines; + + /* remove the NULL-terminator */ + g_ptr_array_remove_index (lines, lines->len - 1); + + while ((line = g_data_input_stream_read_line (log->priv->stream, NULL, + NULL, &err)) != NULL) + { + g_ptr_array_add (lines, (gpointer) line); + } + + if (err) { + job->err = err; + goto out; + } + + /* NULL-terminate the array again */ + g_ptr_array_add (lines, NULL); + + log->priv->has_new_lines = FALSE; + + /* we'll return only the new lines in the callback */ + line = g_ptr_array_index (lines, log->priv->lines_no); + job->lines = (const char **) lines->pdata + log->priv->lines_no; + + /* save the new number of days and lines */ + job->new_days = add_new_days_to_cache (log, job->lines, log->priv->lines_no); + log->priv->lines_no = (lines->len - 1); + +out: + g_io_scheduler_job_send_to_mainloop_async (io_job, + new_lines_job_done, + job, NULL); + return FALSE; +} + +static gboolean +log_load_done (gpointer user_data) +{ + LoadJob *job = user_data; + + if (job->err) { + /* the callback will have NULL as log, and the error set */ + g_object_unref (job->log); + job->callback (NULL, job->err, job->user_data); + g_error_free (job->err); + } else { + job->callback (job->log, NULL, job->user_data); + setup_file_monitor (job->log); + } + + g_slice_free (LoadJob, job); + + return FALSE; +} + +#ifdef HAVE_ZLIB + +/* GZip functions adapted for GIO from mate-vfs/gzip-method.c */ + +#define Z_BUFSIZE 16384 + +#define GZIP_HEADER_SIZE 10 +#define GZIP_MAGIC_1 0x1f +#define GZIP_MAGIC_2 0x8b +#define GZIP_FLAG_ASCII 0x01 /* bit 0 set: file probably ascii text */ +#define GZIP_FLAG_HEAD_CRC 0x02 /* bit 1 set: header CRC present */ +#define GZIP_FLAG_EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ +#define GZIP_FLAG_ORIG_NAME 0x08 /* bit 3 set: original file name present */ +#define GZIP_FLAG_COMMENT 0x10 /* bit 4 set: file comment present */ +#define GZIP_FLAG_RESERVED 0xE0 /* bits 5..7: reserved */ + +static gboolean +skip_string (GInputStream *is) +{ + guchar c; + gssize bytes_read; + + do { + bytes_read = g_input_stream_read (is, &c, 1, NULL, NULL); + + if (bytes_read != 1) { + return FALSE; + } + } while (c != 0); + + return TRUE; +} + +static gboolean +read_gzip_header (GInputStream *is, + time_t *modification_time) +{ + gboolean res; + guchar buffer[GZIP_HEADER_SIZE]; + gssize bytes, to_skip; + guint mode; + guint flags; + + bytes = g_input_stream_read (is, buffer, GZIP_HEADER_SIZE, + NULL, NULL); + if (bytes == -1) { + return FALSE; + } + + if (bytes != GZIP_HEADER_SIZE) + return FALSE; + + if (buffer[0] != GZIP_MAGIC_1 || buffer[1] != GZIP_MAGIC_2) + return FALSE; + + mode = buffer[2]; + if (mode != 8) /* Mode: deflate */ + return FALSE; + + flags = buffer[3]; + + if (flags & GZIP_FLAG_RESERVED) + return FALSE; + + if (flags & GZIP_FLAG_EXTRA_FIELD) { + guchar tmp[2]; + + bytes = g_input_stream_read (is, tmp, 2, NULL, NULL); + + if (bytes != 2) { + return FALSE; + } + + to_skip = tmp[0] | (tmp[0] << 8); + bytes = g_input_stream_skip (is, to_skip, NULL, NULL); + if (bytes != to_skip) { + return FALSE; + } + } + + if (flags & GZIP_FLAG_ORIG_NAME) { + if (!skip_string (is)) { + return FALSE; + } + } + + if (flags & GZIP_FLAG_COMMENT) { + if (!skip_string (is)) { + return FALSE; + } + } + + if (flags & GZIP_FLAG_HEAD_CRC) { + bytes = g_input_stream_skip (is, 2, NULL, NULL); + if (bytes != 2) { + return FALSE; + } + } + + *modification_time = (buffer[4] | (buffer[5] << 8) + | (buffer[6] << 16) | (buffer[7] << 24)); + + return TRUE; +} + +static GZHandle * +gz_handle_new (GFile *file, + GInputStream *parent_stream) +{ + GZHandle *ret; + + ret = g_new (GZHandle, 1); + ret->parent_str = g_object_ref (parent_stream); + ret->file = g_object_ref (file); + ret->buffer = NULL; + + return ret; +} + +static gboolean +gz_handle_init (GZHandle *gz) +{ + gz->zstream.zalloc = NULL; + gz->zstream.zfree = NULL; + gz->zstream.opaque = NULL; + + g_free (gz->buffer); + gz->buffer = g_malloc (Z_BUFSIZE); + gz->zstream.next_in = gz->buffer; + gz->zstream.avail_in = 0; + + if (inflateInit2 (&gz->zstream, -MAX_WBITS) != Z_OK) { + return FALSE; + } + + gz->last_z_result = Z_OK; + gz->last_str_result = TRUE; + + return TRUE; +} + +static void +gz_handle_free (GZHandle *gz) +{ + g_object_unref (gz->parent_str); + g_object_unref (gz->file); + g_free (gz->buffer); + g_free (gz); +} + +static gboolean +fill_buffer (GZHandle *gz, + gsize num_bytes) +{ + gboolean res; + gsize count; + + z_stream * zstream = &gz->zstream; + + if (zstream->avail_in > 0) { + return TRUE; + } + + count = g_input_stream_read (gz->parent_str, + gz->buffer, + Z_BUFSIZE, + NULL, NULL); + if (count == -1) { + if (zstream->avail_out == num_bytes) { + return FALSE; + } + gz->last_str_result = FALSE; + } else { + zstream->next_in = gz->buffer; + zstream->avail_in = count; + } + + return TRUE; +} + +static gboolean +result_from_z_result (int z_result) +{ + switch (z_result) { + case Z_OK: + case Z_STREAM_END: + return TRUE; + case Z_DATA_ERROR: + return FALSE; + default: + return FALSE; + } +} + +static gboolean +gz_handle_read (GZHandle *gz, + guchar *buffer, + gsize num_bytes, + gsize * bytes_read) +{ + z_stream *zstream; + gboolean res; + int z_result; + + *bytes_read = 0; + zstream = &gz->zstream; + + if (gz->last_z_result != Z_OK) { + if (gz->last_z_result == Z_STREAM_END) { + *bytes_read = 0; + return TRUE; + } else { + return result_from_z_result (gz->last_z_result); + } + } else if (gz->last_str_result == FALSE) { + return FALSE; + } + + zstream->next_out = buffer; + zstream->avail_out = num_bytes; + + while (zstream->avail_out != 0) { + res = fill_buffer (gz, num_bytes); + + if (!res) { + return res; + } + + z_result = inflate (zstream, Z_NO_FLUSH); + if (z_result == Z_STREAM_END) { + gz->last_z_result = z_result; + break; + } else if (z_result != Z_OK) { + gz->last_z_result = z_result; + } + + if (gz->last_z_result != Z_OK && zstream->avail_out == num_bytes) { + return result_from_z_result (gz->last_z_result); + } + } + + *bytes_read = num_bytes - zstream->avail_out; + + return TRUE; +} + +static GError * +create_zlib_error (void) +{ + GError *err; + + err = g_error_new_literal (LOGVIEW_ERROR_QUARK, LOGVIEW_ERROR_ZLIB, + _("Error while uncompressing the GZipped log. The file " + "might be corrupt.")); + return err; +} + +#endif /* HAVE_ZLIB */ + +static gboolean +log_load (GIOSchedulerJob *io_job, + GCancellable *cancellable, + gpointer user_data) +{ + /* this runs in a separate i/o thread */ + LoadJob *job = user_data; + LogviewLog *log = job->log; + GFile *f = log->priv->file; + GFileInfo *info; + GInputStream *is; + const char *peeked_buffer; + const char * parse_data[2]; + GSList *days; + const char *content_type; + GFileType type; + GError *err = NULL; + GTimeVal timeval; + gboolean is_archive, can_read; + + info = g_file_query_info (f, + G_FILE_ATTRIBUTE_ACCESS_CAN_READ "," + G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE "," + G_FILE_ATTRIBUTE_STANDARD_DISPLAY_NAME "," + G_FILE_ATTRIBUTE_STANDARD_TYPE "," + G_FILE_ATTRIBUTE_STANDARD_SIZE "," + G_FILE_ATTRIBUTE_TIME_MODIFIED ",", + 0, NULL, &err); + if (err) { + if (err->code == G_IO_ERROR_PERMISSION_DENIED) { + /* TODO: PolicyKit integration */ + } + goto out; + } + + can_read = g_file_info_get_attribute_boolean (info, + G_FILE_ATTRIBUTE_ACCESS_CAN_READ); + if (!can_read) { + /* TODO: PolicyKit integration */ + err = g_error_new_literal (LOGVIEW_ERROR_QUARK, LOGVIEW_ERROR_PERMISSION_DENIED, + _("You don't have enough permissions to read the file.")); + g_object_unref (info); + + goto out; + } + + type = g_file_info_get_file_type (info); + content_type = g_file_info_get_content_type (info); + + is_archive = g_content_type_equals (content_type, "application/x-gzip"); + + if (type != (G_FILE_TYPE_REGULAR || G_FILE_TYPE_SYMBOLIC_LINK) || + (!g_content_type_is_a (content_type, "text/plain") && !is_archive)) + { + err = g_error_new_literal (LOGVIEW_ERROR_QUARK, LOGVIEW_ERROR_NOT_A_LOG, + _("The file is not a regular file or is not a text file.")); + g_object_unref (info); + + goto out; + } + + log->priv->file_size = g_file_info_get_size (info); + g_file_info_get_modification_time (info, &timeval); + log->priv->file_time = timeval.tv_sec; + log->priv->display_name = g_strdup (g_file_info_get_display_name (info)); + + g_object_unref (info); + + /* initialize the stream */ + is = G_INPUT_STREAM (g_file_read (f, NULL, &err)); + + if (err) { + if (err->code == G_IO_ERROR_PERMISSION_DENIED) { + /* TODO: PolicyKit integration */ + } + + goto out; + } + + if (is_archive) { +#ifdef HAVE_ZLIB + GZHandle *gz; + gboolean res; + guchar * buffer; + gsize bytes_read; + GInputStream *real_is; + time_t mtime; /* seconds */ + + /* this also skips the header from |is| */ + res = read_gzip_header (is, &mtime); + + if (!res) { + g_object_unref (is); + + err = create_zlib_error (); + goto out; + } + + log->priv->file_time = mtime; + + gz = gz_handle_new (f, is); + res = gz_handle_init (gz); + + if (!res) { + g_object_unref (is); + gz_handle_free (gz); + + err = create_zlib_error (); + goto out; + } + + real_is = g_memory_input_stream_new (); + + do { + buffer = g_malloc (1024); + res = gz_handle_read (gz, buffer, 1024, &bytes_read); + g_memory_input_stream_add_data (G_MEMORY_INPUT_STREAM (real_is), + buffer, bytes_read, g_free); + } while (res == TRUE && bytes_read > 0); + + if (!res) { + gz_handle_free (gz); + g_object_unref (real_is); + g_object_unref (is); + + err = create_zlib_error (); + goto out; + } + + g_object_unref (is); + is = real_is; + + gz_handle_free (gz); +#else /* HAVE_ZLIB */ + g_object_unref (is); + + err = g_error_new_literal (LOGVIEW_ERROR_QUARK, LOGVIEW_ERROR_NOT_SUPPORTED, + _("This version of System Log does not support GZipped logs.")); + goto out; +#endif /* HAVE_ZLIB */ + } + + log->priv->stream = g_data_input_stream_new (is); + + /* sniff into the stream for a timestamped line */ + g_buffered_input_stream_fill (G_BUFFERED_INPUT_STREAM (log->priv->stream), + (gssize) g_buffered_input_stream_get_buffer_size (G_BUFFERED_INPUT_STREAM (log->priv->stream)), + NULL, &err); + if (err == NULL) { + peeked_buffer = g_buffered_input_stream_peek_buffer + (G_BUFFERED_INPUT_STREAM (log->priv->stream), NULL); + parse_data[0] = peeked_buffer; + parse_data[1] = NULL; + + if ((days = log_read_dates (parse_data, time (NULL))) != NULL) { + log->priv->has_days = TRUE; + g_slist_foreach (days, (GFunc) logview_utils_day_free, NULL); + g_slist_free (days); + } else { + log->priv->has_days = FALSE; + } + } else { + log->priv->has_days = FALSE; + g_clear_error (&err); + } + + g_object_unref (is); + +out: + if (err) { + job->err = err; + } + + g_io_scheduler_job_send_to_mainloop_async (io_job, + log_load_done, + job, NULL); + return FALSE; +} + +static void +log_setup_load (LogviewLog *log, LogviewCreateCallback callback, + gpointer user_data) +{ + LoadJob *job; + + job = g_slice_new0 (LoadJob); + job->callback = callback; + job->user_data = user_data; + job->log = log; + job->err = NULL; + + /* push the loading job into another thread */ + g_io_scheduler_push_job (log_load, + job, + NULL, 0, NULL); +} + +/* public methods */ + +void +logview_log_read_new_lines (LogviewLog *log, + LogviewNewLinesCallback callback, + gpointer user_data) +{ + NewLinesJob *job; + + /* initialize the job struct with sensible values */ + job = g_slice_new0 (NewLinesJob); + job->callback = callback; + job->user_data = user_data; + job->log = g_object_ref (log); + job->err = NULL; + job->lines = NULL; + job->new_days = NULL; + + /* push the fetching job into another thread */ + g_io_scheduler_push_job (do_read_new_lines, + job, + NULL, 0, NULL); +} + +void +logview_log_create (const char *filename, LogviewCreateCallback callback, + gpointer user_data) +{ + LogviewLog *log = g_object_new (LOGVIEW_TYPE_LOG, NULL); + + log->priv->file = g_file_new_for_path (filename); + + log_setup_load (log, callback, user_data); +} + +void +logview_log_create_from_gfile (GFile *file, LogviewCreateCallback callback, + gpointer user_data) +{ + LogviewLog *log = g_object_new (LOGVIEW_TYPE_LOG, NULL); + + log->priv->file = g_object_ref (file); + + log_setup_load (log, callback, user_data); +} + +const char * +logview_log_get_display_name (LogviewLog *log) +{ + g_assert (LOGVIEW_IS_LOG (log)); + + return log->priv->display_name; +} + +time_t +logview_log_get_timestamp (LogviewLog *log) +{ + g_assert (LOGVIEW_IS_LOG (log)); + + return log->priv->file_time; +} + +goffset +logview_log_get_file_size (LogviewLog *log) +{ + g_assert (LOGVIEW_IS_LOG (log)); + + return log->priv->file_size; +} + +guint +logview_log_get_cached_lines_number (LogviewLog *log) +{ + g_assert (LOGVIEW_IS_LOG (log)); + + return log->priv->lines_no; +} + +const char ** +logview_log_get_cached_lines (LogviewLog *log) +{ + const char ** lines = NULL; + + g_assert (LOGVIEW_IS_LOG (log)); + + if (log->priv->lines) { + lines = (const char **) log->priv->lines->pdata; + } + + return lines; +} + +GSList * +logview_log_get_days_for_cached_lines (LogviewLog *log) +{ + g_assert (LOGVIEW_IS_LOG (log)); + + return log->priv->days; +} + +gboolean +logview_log_has_new_lines (LogviewLog *log) +{ + g_assert (LOGVIEW_IS_LOG (log)); + + return log->priv->has_new_lines; +} + +char * +logview_log_get_uri (LogviewLog *log) +{ + g_assert (LOGVIEW_IS_LOG (log)); + + return g_file_get_uri (log->priv->file); +} + +GFile * +logview_log_get_gfile (LogviewLog *log) +{ + g_assert (LOGVIEW_IS_LOG (log)); + + return g_object_ref (log->priv->file); +} + +gboolean +logview_log_get_has_days (LogviewLog *log) +{ + g_assert (LOGVIEW_IS_LOG (log)); + + return log->priv->has_days; +} + |