ne 12. 7. 2020 v 3:43 odesÃlatel vignesh C <[email protected]> napsal:
> On Mon, Jul 6, 2020 at 10:05 AM Pavel Stehule <[email protected]>
> wrote:
> >
> > here is support for comment's line - first char should be #
> >
>
> Few comments:
> + str = fgets(*lineptr + total_chars,
> + *n - total_chars,
> + fp);
> +
> + if (ferror(fp))
> + return -1;
>
> Should we include any error message in the above case.
>
> + else
> + break;
> + }
> +
> + if (ferror(fp))
> + return -1;
>
> Similar to above.
>
it should be ok, both variant finishing by
<-->if (ferror(fp))
<--><-->fatal("could not read from file \"%s\": %m", filename);
%m should to print related error message
>
> + /* check, if there is good enough space for
> next content */
> + if (*n - total_chars < 2)
> + {
> + *n += 1024;
> + *lineptr = pg_realloc(*lineptr, *n);
> + }
> We could use a macro in place of 1024.
>
done
> + if (objecttype == 't')
> + {
> + if (is_include)
> + {
> +
> simple_string_list_append(&table_include_patterns,
> +
> objectname);
> +
> dopt.include_everything = false;
> + }
> + else
> +
> simple_string_list_append(&table_exclude_patterns,
> +
> objectname);
> + }
> + else if (objecttype == 'n')
> + {
> + if (is_include)
> + {
> +
> simple_string_list_append(&schema_include_patterns,
> +
> objectname);
> +
> dopt.include_everything = false;
> + }
> + else
> +
> simple_string_list_append(&schema_exclude_patterns,
> +
> objectname);
> + }
> Some of the above code is repetitive in above, can the common code be
> made into a macro and called?
>
There are two same fragments and two different fragments. In this case I
don't think so using macro or auxiliary function can help with readability.
Current code is well structured and well readable.
>
> printf(_(" --extra-float-digits=NUM override default
> setting for extra_float_digits\n"));
> + printf(_(" --filter=FILENAME read object name
> filter expressions from file\n"));
> printf(_(" --if-exists use IF EXISTS when
> dropping objects\n"));
> Can this be changed to dump objects and data based on the filter
> expressions from the filter file.
>
I am sorry, I don't understand. This should work for data from specified by
filter without any modification.
attached updated patch
Regards
Pavel
> Regards,
> Vignesh
> EnterpriseDB: http://www.enterprisedb.com
>
diff --git a/doc/src/sgml/ref/pg_dump.sgml b/doc/src/sgml/ref/pg_dump.sgml
index 7a37fd8045..2f2bfb4dbf 100644
--- a/doc/src/sgml/ref/pg_dump.sgml
+++ b/doc/src/sgml/ref/pg_dump.sgml
@@ -755,6 +755,99 @@ PostgreSQL documentation
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><option>--filter=<replaceable class="parameter">filename</replaceable></option></term>
+ <listitem>
+ <para>
+ This option ensure reading object's filters from specified file.
+ If you use "-" as filename, then stdin is used as source. This file
+ has to have following line format:
+<synopsis>
+(+|-)[tnfd] <replaceable class="parameter">objectname</replaceable>
+</synopsis>
+ Only one object name can be specified per one line:
+<programlisting>
++t mytable1
++t mytable2
++f some_foreign_table
+-d mytable3
+</programlisting>
+ With this file the dump ensures dump table <literal>mytable1</literal>,
+ <literal>mytable2</literal>. The data of foreign table
+ <literal>some_foreign_table</literal> will be dumped too. And the data
+ of <literal>mytable3</literal> will not be dumped.
+ </para>
+
+ <para>
+ The first char <literal>+</literal> or <literal>-</literal> specifies
+ if object name will be used as include or exclude filter.
+ </para>
+
+ <para>
+ The second char
+ <literal>t</literal>,
+ <literal>n</literal>,
+ <literal>f</literal>,
+ <literal>d</literal>
+ specifies a object type.
+
+ <variablelist>
+ <varlistentry>
+ <term><literal>t</literal></term>
+ <listitem>
+ <para>
+ In inclusive form (<literal>+</literal>) it does same work like
+ <option>--table</option>. In exclusive form (<literal>-</literal>)
+ it is same like <option>--exclude-table</option>.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>n</literal></term>
+ <listitem>
+ <para>
+ In inclusive form (<literal>+</literal>) it does same work like
+ <option>--schema</option>. In exclusive form (<literal>-</literal>)
+ it is same like <option>--exclude-schema</option>.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>f</literal></term>
+ <listitem>
+ <para>
+ In inclusive form (<literal>+</literal>) it does same work like
+ <option>--include-foreign-data</option>. The exclusive form
+ (<literal>-</literal>) is not allowed.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><literal>d</literal></term>
+ <listitem>
+ <para>
+ The inclusive form (<literal>+</literal>) is not allowed.
+ In exclusive form (<literal>-</literal>) it is same like
+ <option>--exclude-table-data</option>.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </para>
+
+ <para>
+ The option <option>--filter</option> can be used together with options
+ <option>--table</option>, <option>--exclude-table</option>,
+ <option>--schema</option>, <option>--exclude-schema</option>,
+ <option>--include-foreign-data</option> and
+ <option>--exclude-table-data</option>.
+ </para>
+ </listitem>
+ </varlistentry>
+
<varlistentry>
<term><option>--if-exists</option></term>
<listitem>
diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index e758b5c50a..fd6b7a174a 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -290,6 +290,7 @@ static void appendReloptionsArrayAH(PQExpBuffer buffer, const char *reloptions,
static char *get_synchronized_snapshot(Archive *fout);
static void setupDumpWorker(Archive *AHX);
static TableInfo *getRootTableInfo(TableInfo *tbinfo);
+static void read_patterns_from_file(char *filename, DumpOptions *dopt);
int
@@ -364,6 +365,7 @@ main(int argc, char **argv)
{"enable-row-security", no_argument, &dopt.enable_row_security, 1},
{"exclude-table-data", required_argument, NULL, 4},
{"extra-float-digits", required_argument, NULL, 8},
+ {"filter", required_argument, NULL, 12},
{"if-exists", no_argument, &dopt.if_exists, 1},
{"inserts", no_argument, NULL, 9},
{"lock-wait-timeout", required_argument, NULL, 2},
@@ -603,6 +605,10 @@ main(int argc, char **argv)
optarg);
break;
+ case 12: /* filter implementation */
+ read_patterns_from_file(optarg, &dopt);
+ break;
+
default:
fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
exit_nicely(1);
@@ -1022,6 +1028,7 @@ help(const char *progname)
" access to)\n"));
printf(_(" --exclude-table-data=PATTERN do NOT dump data for the specified table(s)\n"));
printf(_(" --extra-float-digits=NUM override default setting for extra_float_digits\n"));
+ printf(_(" --filter=FILENAME read object name filter expressions from file\n"));
printf(_(" --if-exists use IF EXISTS when dropping objects\n"));
printf(_(" --include-foreign-data=PATTERN\n"
" include data of foreign tables on foreign\n"
@@ -18597,3 +18604,211 @@ appendReloptionsArrayAH(PQExpBuffer buffer, const char *reloptions,
if (!res)
pg_log_warning("could not parse reloptions array");
}
+
+#define FILTER_INITIAL_LINE_SIZE 1024
+#define PG_GETLINE_EXTEND_LINE_SIZE 1024
+
+/*
+ * getline is originaly GNU function, and should not be everywhere still.
+ * Use own reduced implementation.
+ */
+static size_t
+pg_getline(char **lineptr, size_t *n, FILE *fp)
+{
+ size_t total_chars = 0;
+
+ while (!feof(fp) && !ferror(fp))
+ {
+ char *str;
+ size_t chars;
+
+ str = fgets(*lineptr + total_chars,
+ *n - total_chars,
+ fp);
+
+ if (ferror(fp))
+ return -1;
+
+ if (str)
+ {
+ chars = strlen(str);
+ total_chars += chars;
+
+ if (chars > 0 && str[chars - 1] == '\n')
+ return total_chars;
+
+ /* check, if there is good enough space for next content */
+ if (*n - total_chars < 2)
+ {
+ *n += PG_GETLINE_EXTEND_LINE_SIZE;
+ *lineptr = pg_realloc(*lineptr, *n);
+ }
+ }
+ else
+ break;
+ }
+
+ if (ferror(fp))
+ return -1;
+
+ return total_chars > 0 ? total_chars : -1;
+}
+
+/*
+ * Print error message and exit.
+ */
+static void
+exit_invalid_filter_format(FILE *fp, char *filename, char *message, char *line, int lineno)
+{
+ pg_log_error("invalid format of filter file \"%s\": %s",
+ filename,
+ message);
+
+ fprintf(stderr, "%d: %s\n", lineno, line);
+
+ if (fp != stdin)
+ fclose(fp);
+
+ exit_nicely(-1);
+}
+
+/*
+ * Read dumped object specification from file
+ */
+static void
+read_patterns_from_file(char *filename, DumpOptions *dopt)
+{
+ FILE *fp;
+ char *line;
+ ssize_t chars;
+ size_t line_size = FILTER_INITIAL_LINE_SIZE;
+ int lineno = 0;
+
+ /* use "-" as symbol for stdin */
+ if (strcmp(filename, "-") != 0)
+ {
+ fp = fopen(filename, "r");
+ if (!fp)
+ fatal("could not open the input file \"%s\": %m",
+ filename);
+ }
+ else
+ fp = stdin;
+
+ line = pg_malloc(line_size);
+
+ while ((chars = pg_getline(&line, &line_size, fp)) != -1)
+ {
+ bool is_include;
+ char objecttype;
+ char *objectname;
+
+ lineno += 1;
+
+ if (line[chars - 1] == '\n')
+ line[chars - 1] = '\0';
+
+ /* ignore empty rows */
+ if (*line == '\0')
+ continue;
+
+ /* when first char is hash, ignore whole line */
+ if (*line == '#')
+ continue;
+
+ if (chars < 2)
+ exit_invalid_filter_format(fp,
+ filename,
+ "too short line",
+ line,
+ lineno);
+
+ if (line[0] == '+')
+ is_include = true;
+ else if (line[0] == '-')
+ is_include = false;
+ else
+ exit_invalid_filter_format(fp,
+ filename,
+ "invalid option type (use [+-]",
+ line,
+ lineno);
+
+ objecttype = line[1];
+ objectname = &line[2];
+
+ /* skip initial spaces */
+ while (isspace(*objectname))
+ objectname++;
+
+ if (*objectname == '\0')
+ exit_invalid_filter_format(fp,
+ filename,
+ "missing object name",
+ line,
+ lineno);
+
+ if (objecttype == 't')
+ {
+ if (is_include)
+ {
+ simple_string_list_append(&table_include_patterns,
+ objectname);
+ dopt->include_everything = false;
+ }
+ else
+ simple_string_list_append(&table_exclude_patterns,
+ objectname);
+ }
+ else if (objecttype == 'n')
+ {
+ if (is_include)
+ {
+ simple_string_list_append(&schema_include_patterns,
+ objectname);
+ dopt->include_everything = false;
+ }
+ else
+ simple_string_list_append(&schema_exclude_patterns,
+ objectname);
+ }
+ else if (objecttype == 'd')
+ {
+ if (is_include)
+ exit_invalid_filter_format(fp,
+ filename,
+ "include filter is not supported for this type of object",
+ line,
+ lineno);
+ else
+ simple_string_list_append(&tabledata_exclude_patterns,
+ objectname);
+ }
+ else if (objecttype == 'f')
+ {
+ if (is_include)
+ simple_string_list_append(&foreign_servers_include_patterns,
+ objectname);
+ else
+ exit_invalid_filter_format(fp,
+ filename,
+ "exclude filter is not supported for this type of object",
+ line,
+ lineno);
+ }
+ else
+ exit_invalid_filter_format(fp,
+ filename,
+ "invalid object type (use [tndf])",
+ line,
+ lineno);
+ }
+
+ if (ferror(fp))
+ fatal("could not read from file \"%s\": %m", filename);
+
+ if (fp != stdin)
+ fclose(fp);
+
+ pg_free(line);
+}
