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https://gitlab.com/simple-nixos-mailserver/nixos-mailserver.git
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dovecot/fts: switch to fts-flatcurve
This switches the full-text search plugin from fts-xapian to fts-flatcurve, the now preferred indexer still powered by Xapian, which will be integrated into Dovecot core 2.4. This sets a sane minimal configuration for the plugin with international language support. The plugin options marked as "advanced" in Dovecot's documentation aren't re-exposed for simplicity. They can nevertheless be overridden by module consumers by directly setting keys with `services.dovecot2.pluginSettings.fts_*`. The `fullTextSearch.maintenance` option is removed as the index is now incrementally optimised in the background. GitLab: closes https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/issues/239
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euxane
parent
433520257a
commit
2ed7a94782
98
default.nix
98
default.nix
@ -380,7 +380,21 @@ in
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};
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fullTextSearch = {
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enable = mkEnableOption "Full text search indexing with xapian. This has significant performance and disk space cost.";
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enable = mkEnableOption ''
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Full text search indexing with Xapian through the fts_flatcurve plugin.
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This has significant performance and disk space cost.
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'';
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memoryLimit = mkOption {
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type = types.nullOr types.int;
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default = null;
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example = 2000;
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description = ''
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Memory limit for the indexer process, in MiB.
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If null, leaves the default (which is rather low),
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and if 0, no limit.
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'';
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};
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autoIndex = mkOption {
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type = types.bool;
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default = true;
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@ -406,36 +420,54 @@ in
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'';
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};
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minSize = mkOption {
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type = types.ints.between 3 1000;
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default = 3;
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description = "Minimum size of search terms";
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};
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memoryLimit = mkOption {
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type = types.nullOr types.int;
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default = null;
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example = 2000;
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description = "Memory limit for the indexer process, in MiB. If null, leaves the default (which is rather low), and if 0, no limit.";
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languages = mkOption {
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type = types.nonEmptyListOf types.str;
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default = [ "en" ];
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example = [ "en" "de" ];
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description = ''
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A list of languages that the full text search should detect.
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At least one language must be specified.
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The language listed first is the default and is used when language recognition fails.
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See <https://doc.dovecot.org/main/core/plugins/fts.html#fts_languages>.
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'';
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};
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maintenance = {
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enable = mkOption {
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type = types.bool;
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default = true;
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description = "Regularly optmize indices, as recommended by upstream.";
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};
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substringSearch = mkOption {
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type = types.bool;
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default = false;
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description = ''
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If enabled, allows substring searches.
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See <https://doc.dovecot.org/main/core/plugins/fts_flatcurve.html#fts_flatcurve_substring_search>.
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onCalendar = mkOption {
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type = types.str;
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default = "daily";
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description = "When to run the maintenance job. See systemd.time(7) for more information about the format.";
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};
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Enabling this requires significant additional storage space.
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'';
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};
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randomizedDelaySec = mkOption {
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type = types.int;
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default = 1000;
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description = "Run the maintenance job not exactly at the time specified with `onCalendar`, but plus or minus this many seconds.";
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};
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headerExcludes = mkOption {
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type = types.listOf types.str;
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default = [
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"Received"
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"DKIM-*"
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"X-*"
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"Comments"
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];
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description = ''
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The list of headers to exclude.
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See <https://doc.dovecot.org/main/core/plugins/fts.html#fts_header_excludes>.
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'';
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};
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filters = mkOption {
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type = types.listOf types.str;
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default = [
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"normalizer-icu"
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"snowball"
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"stopwords"
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];
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description = ''
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The list of filters to apply.
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<https://doc.dovecot.org/main/core/plugins/fts.html#filter-configuration>.
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'';
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};
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};
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@ -1269,6 +1301,18 @@ in
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};
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imports = [
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(lib.mkRemovedOptionModule [ "mailserver" "fullTextSearch" "maintenance" "enable" ] ''
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This option is not needed for fts-flatcurve
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'')
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(lib.mkRemovedOptionModule [ "mailserver" "fullTextSearch" "maintenance" "onCalendar" ] ''
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This option is not needed for fts-flatcurve
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'')
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(lib.mkRemovedOptionModule [ "mailserver" "fullTextSearch" "maintenance" "randomizedDelaySec" ] ''
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This option is not needed for fts-flatcurve
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'')
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(lib.mkRemovedOptionModule [ "mailserver" "fullTextSearch" "minSize" ] ''
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This option is not supported by fts-flatcurve
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'')
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(lib.mkRemovedOptionModule [ "mailserver" "fullTextSearch" "maxSize" ] ''
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This option is not needed since fts-xapian 1.8.3
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'')
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@ -4,7 +4,7 @@ Full text search
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By default, when your IMAP client searches for an email containing some
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text in its *body*, dovecot will read all your email sequentially. This
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is very slow and IO intensive. To speed body searches up, it is possible to
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*index* emails with a plugin to dovecot, ``fts_xapian``.
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*index* emails with a plugin to dovecot, ``fts_flatcurve``.
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Enabling full text search
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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@ -59,7 +59,8 @@ Mitigating resources requirements
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You can:
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* increase the minimum search term size ``mailserver.fullTextSearch.minSize``
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* exclude some headers from indexation with ``mailserver.fullTextSearch.headerExcludes``
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* disable expensive token normalisation in ``mailserver.fullTextSearch.filters``
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* disable automatic indexation for some folders with
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``mailserver.fullTextSearch.autoIndexExclude``. Folders can be specified by
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name (``"Trash"``), by special use (``"\\Junk"``) or with a wildcard.
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@ -26,7 +26,12 @@ let
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userdbFile = "${passwdDir}/userdb";
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# This file contains the ldap bind password
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ldapConfFile = "${passwdDir}/dovecot-ldap.conf.ext";
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bool2int = x: if x then "1" else "0";
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boolToYesNo = x: if x then "yes" else "no";
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listToLine = lib.concatStringsSep " ";
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listToMultiAttrs = keyPrefix: attrs: lib.listToAttrs (lib.imap1 (n: x: {
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name = "${keyPrefix}${if n==1 then "" else toString n}";
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value = x;
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}) attrs);
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maildirLayoutAppendix = lib.optionalString cfg.useFsLayout ":LAYOUT=fs";
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maildirUTF8FolderNames = lib.optionalString cfg.useUTF8FolderNames ":UTF-8";
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@ -122,10 +127,22 @@ let
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dovecotModules = [
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pkgs.dovecot_pigeonhole
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] ++ lib.optional cfg.fullTextSearch.enable pkgs.dovecot_fts_xapian;
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] ++ lib.optional cfg.fullTextSearch.enable pkgs.dovecot-fts-flatcurve;
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# Remove and assume `false` after NixOS 25.05
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haveDovecotModulesOption = options.services.dovecot2 ? "modules" && (options.services.dovecot2.modules.visible or true);
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ftsPluginSettings = {
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fts = "flatcurve";
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fts_languages = listToLine cfg.fullTextSearch.languages;
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fts_tokenizers = listToLine [ "generic" "email-address" ];
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fts_tokenizer_email_address = "maxlen=100"; # default 254 too large for Xapian
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fts_flatcurve_substring_search = boolToYesNo cfg.fullTextSearch.substringSearch;
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fts_filters = listToLine cfg.fullTextSearch.filters;
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fts_header_excludes = listToLine cfg.fullTextSearch.headerExcludes;
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fts_autoindex = boolToYesNo cfg.fullTextSearch.autoIndex;
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fts_enforced = cfg.fullTextSearch.enforced;
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} // (listToMultiAttrs "fts_autoindex_exclude" cfg.fullTextSearch.autoIndexExclude);
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in
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{
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config = with cfg; lib.mkIf enable {
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@ -160,14 +177,17 @@ in
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sslServerCert = certificatePath;
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sslServerKey = keyPath;
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enableLmtp = true;
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mailPlugins.globally.enable = lib.optionals cfg.fullTextSearch.enable [ "fts" "fts_xapian" ];
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mailPlugins.globally.enable = lib.optionals cfg.fullTextSearch.enable [
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"fts"
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"fts_flatcurve"
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];
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protocols = lib.optional cfg.enableManageSieve "sieve";
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pluginSettings = {
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sieve = "file:${cfg.sieveDirectory}/%{user}/scripts;active=${cfg.sieveDirectory}/%{user}/active.sieve";
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sieve_default = "file:${cfg.sieveDirectory}/%{user}/default.sieve";
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sieve_default_name = "default";
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};
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} // (lib.optionalAttrs cfg.fullTextSearch.enable ftsPluginSettings);
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sieve = {
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extensions = [
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@ -341,26 +361,11 @@ in
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inbox = yes
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}
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${lib.optionalString cfg.fullTextSearch.enable ''
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plugin {
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plugin = fts fts_xapian
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fts = xapian
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fts_xapian = partial=${toString cfg.fullTextSearch.minSize} verbose=${bool2int cfg.debug}
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fts_autoindex = ${if cfg.fullTextSearch.autoIndex then "yes" else "no"}
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${lib.strings.concatImapStringsSep "\n" (n: x: "fts_autoindex_exclude${if n==1 then "" else toString n} = ${x}") cfg.fullTextSearch.autoIndexExclude}
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fts_enforced = ${cfg.fullTextSearch.enforced}
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}
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service indexer-worker {
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${lib.optionalString (cfg.fullTextSearch.memoryLimit != null) ''
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vsz_limit = ${toString (cfg.fullTextSearch.memoryLimit*1024*1024)}
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''}
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process_limit = 0
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}
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''}
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lda_mailbox_autosubscribe = yes
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lda_mailbox_autocreate = yes
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@ -378,29 +383,5 @@ in
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};
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systemd.services.postfix.restartTriggers = [ genPasswdScript ] ++ (lib.optional cfg.ldap.enable [setPwdInLdapConfFile]);
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systemd.services.dovecot-fts-xapian-optimize = lib.mkIf (cfg.fullTextSearch.enable && cfg.fullTextSearch.maintenance.enable) {
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description = "Optimize dovecot indices for fts_xapian";
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requisite = [ "dovecot2.service" ];
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after = [ "dovecot2.service" ];
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startAt = cfg.fullTextSearch.maintenance.onCalendar;
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serviceConfig = {
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Type = "oneshot";
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ExecStart = "${pkgs.dovecot}/bin/doveadm fts optimize -A";
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PrivateDevices = true;
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PrivateNetwork = true;
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ProtectKernelTunables = true;
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ProtectKernelModules = true;
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ProtectControlGroups = true;
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ProtectHome = true;
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ProtectSystem = true;
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PrivateTmp = true;
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};
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};
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systemd.timers.dovecot-fts-xapian-optimize = lib.mkIf (cfg.fullTextSearch.enable && cfg.fullTextSearch.maintenance.enable && cfg.fullTextSearch.maintenance.randomizedDelaySec != 0) {
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timerConfig = {
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RandomizedDelaySec = cfg.fullTextSearch.maintenance.randomizedDelaySec;
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};
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};
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};
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}
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@ -82,8 +82,6 @@
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# special use depends on https://github.com/NixOS/nixpkgs/pull/93201
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autoIndexExclude = [ (if (pkgs.lib.versionAtLeast pkgs.lib.version "21") then "\\Junk" else "Junk") ];
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enforced = "yes";
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# fts-xapian warns when memory is low, which makes the test fail
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memoryLimit = 100000;
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};
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};
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};
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@ -493,11 +491,9 @@
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# should fail because this folder is not indexed
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client.fail("search Junk a >&2")
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# check that search really goes through the indexer
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server.succeed(
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"journalctl -u dovecot2 | grep -E 'indexer-worker.* Done indexing .INBOX.' >&2"
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)
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server.succeed("journalctl -u dovecot2 | grep 'fts-flatcurve(INBOX): Query ' >&2")
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# check that Junk is not indexed
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server.fail("journalctl -u dovecot2 | grep 'indexer-worker' | grep -i 'JUNK' >&2")
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server.fail("journalctl -u dovecot2 | grep 'fts-flatcurve(JUNK): Indexing ' >&2")
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with subtest("dmarc reporting"):
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server.systemctl("start rspamd-dmarc-reporter.service")
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@ -507,14 +503,6 @@
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server.fail("journalctl -u postfix | grep -i warning >&2")
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server.fail("journalctl -u dovecot2 | grep -v 'imap-login: Debug: SSL error: Connection closed' | grep -i error >&2")
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# harmless ? https://dovecot.org/pipermail/dovecot/2020-August/119575.html
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server.fail(
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"journalctl -u dovecot2 | \
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grep -v 'Expunged message reappeared, giving a new UID' | \
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grep -v 'FTS Xapian: Box is empty' | \
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grep -v 'FTS Xapian: New version of the plugin' | \
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grep -vE 'FTS Xapian:.*does not exist. Creating it' | \
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grep -vE 'FTS Xapian:.*indexes do not exist. Initializing DB' | \
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grep -i warning >&2"
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)
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server.fail("journalctl -u dovecot2 | grep -v 'Expunged message reappeared, giving a new UID' | grep -i warning >&2")
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'';
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}
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