Adding upstream version 1:2.3.19.1+dfsg1.upstream/1%2.3.19.1+dfsg1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

17 files changed, 2552 insertions, 0 deletions

diff --git a/src/indexer/Makefile.am b/src/indexer/Makefile.am
new file mode 100644
index 0000000..8bfc891
--- /dev/null
+++ b/src/indexer/Makefile.am
@@ -0,0 +1,47 @@
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+
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+
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+	-I$(top_srcdir)/src/lib-index \
+	-I$(top_srcdir)/src/lib-storage \
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+	$(BINARY_LDFLAGS)
+
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+	indexer-client.c \
+	indexer-queue.c \
+	indexer-settings.c \
+	worker-connection.c \
+	worker-pool.c
+
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+
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+	indexer-worker.c \
+	indexer-worker-settings.c \
+	master-connection.c
+
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+	indexer.h \
+	indexer-client.h \
+	indexer-queue.h \
+	master-connection.h \
+	worker-connection.h \
+	worker-pool.h
+
diff --git a/src/indexer/Makefile.in b/src/indexer/Makefile.in
new file mode 100644
index 0000000..a62a4b0
--- /dev/null
+++ b/src/indexer/Makefile.in
@@ -0,0 +1,869 @@
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+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib \
+	-I$(top_srcdir)/src/lib-master \
+	-I$(top_srcdir)/src/lib-settings \
+	-I$(top_srcdir)/src/lib-mail \
+	-I$(top_srcdir)/src/lib-index \
+	-I$(top_srcdir)/src/lib-storage \
+	-DPKG_RUNDIR=\""$(rundir)"\" \
+	$(BINARY_CFLAGS)
+
+indexer_LDADD = $(LIBDOVECOT) \
+	$(BINARY_LDFLAGS)
+
+indexer_DEPENDENCIES = $(LIBDOVECOT_DEPS)
+indexer_SOURCES = \
+	indexer.c \
+	indexer-client.c \
+	indexer-queue.c \
+	indexer-settings.c \
+	worker-connection.c \
+	worker-pool.c
+
+indexer_worker_LDADD = \
+	$(LIBDOVECOT_STORAGE) \
+	$(LIBDOVECOT) \
+	$(BINARY_LDFLAGS)
+
+indexer_worker_DEPENDENCIES = \
+	$(LIBDOVECOT_STORAGE_DEPS) \
+	$(LIBDOVECOT_DEPS)
+
+indexer_worker_SOURCES = \
+	indexer-worker.c \
+	indexer-worker-settings.c \
+	master-connection.c
+
+noinst_HEADERS = \
+	indexer.h \
+	indexer-client.h \
+	indexer-queue.h \
+	master-connection.h \
+	worker-connection.h \
+	worker-pool.h
+
+all: all-am
+
+.SUFFIXES:
+.SUFFIXES: .c .lo .o .obj
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
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+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/indexer/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/indexer/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
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+	  *) \
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+
+indexer-worker$(EXEEXT): $(indexer_worker_OBJECTS) $(indexer_worker_DEPENDENCIES) $(EXTRA_indexer_worker_DEPENDENCIES) 
+	@rm -f indexer-worker$(EXEEXT)
+	$(AM_V_CCLD)$(LINK) $(indexer_worker_OBJECTS) $(indexer_worker_LDADD) $(LIBS)
+
+mostlyclean-compile:
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+	      $$unique; \
+	  fi; \
+	fi
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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
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+distclean-tags:
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
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+	-rm -f ./$(DEPDIR)/indexer-worker.Po
+	-rm -f ./$(DEPDIR)/indexer.Po
+	-rm -f ./$(DEPDIR)/master-connection.Po
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+	-rm -f ./$(DEPDIR)/master-connection.Po
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+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/indexer/indexer-client.c b/src/indexer/indexer-client.c
new file mode 100644
index 0000000..ea557c0
--- /dev/null
+++ b/src/indexer/indexer-client.c
@@ -0,0 +1,223 @@
+/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "connection.h"
+#include "istream.h"
+#include "ostream.h"
+#include "strescape.h"
+#include "master-service.h"
+#include "indexer-queue.h"
+#include "indexer-client.h"
+
+#include <unistd.h>
+
+#define MAX_INBUF_SIZE (1024*64)
+
+#define INDEXER_CLIENT_PROTOCOL_MAJOR_VERSION 1
+#define INDEXER_CLIENT_PROTOCOL_MINOR_VERSION 0
+
+struct indexer_client {
+	struct connection conn;
+
+	int refcount;
+	struct indexer_queue *queue;
+};
+
+struct indexer_client_request {
+	struct indexer_client *client;
+	unsigned int tag;
+};
+
+static void indexer_client_destroy(struct connection *conn);
+static void indexer_client_ref(struct indexer_client *client);
+static void indexer_client_unref(struct indexer_client *client);
+
+static int
+indexer_client_request_queue(struct indexer_client *client, bool append,
+			     const char *const *args, const char **error_r)
+{
+	struct indexer_client_request *ctx = NULL;
+	const char *session_id = NULL;
+	unsigned int tag, max_recent_msgs;
+
+	/* <tag> <user> <mailbox> [<max_recent_msgs> [<session ID>]] */
+	if (str_array_length(args) < 3) {
+		*error_r = "Wrong parameter count";
+		return -1;
+	}
+	if (str_to_uint(args[0], &tag) < 0) {
+		*error_r = "Invalid tag";
+		return -1;
+	}
+	if (args[3] == NULL)
+		max_recent_msgs = 0;
+	else if (str_to_uint(args[3], &max_recent_msgs) < 0) {
+		*error_r = "Invalid max_recent_msgs";
+		return -1;
+	} else {
+		session_id = args[4];
+	}
+
+	if (tag != 0) {
+		ctx = i_new(struct indexer_client_request, 1);
+		ctx->client = client;
+		ctx->tag = tag;
+		indexer_client_ref(client);
+	}
+
+	indexer_queue_append(client->queue, append, args[1], args[2],
+			     session_id, max_recent_msgs, ctx);
+	o_stream_nsend_str(client->conn.output, t_strdup_printf("%u\tOK\n", tag));
+	return 0;
+}
+
+static int
+indexer_client_request_optimize(struct indexer_client *client,
+				const char *const *args, const char **error_r)
+{
+	struct indexer_client_request *ctx = NULL;
+	unsigned int tag;
+
+	/* <tag> <user> <mailbox> */
+	if (str_array_length(args) != 3) {
+		*error_r = "Wrong parameter count";
+		return -1;
+	}
+	if (str_to_uint(args[0], &tag) < 0) {
+		*error_r = "Invalid tag";
+		return -1;
+	}
+
+	if (tag != 0) {
+		ctx = i_new(struct indexer_client_request, 1);
+		ctx->client = client;
+		ctx->tag = tag;
+		indexer_client_ref(client);
+	}
+
+	indexer_queue_append_optimize(client->queue, args[1], args[2], ctx);
+	o_stream_nsend_str(client->conn.output, t_strdup_printf("%u\tOK\n", tag));
+	return 0;
+}
+
+static int
+indexer_client_request(struct indexer_client *client,
+		       const char *const *args, const char **error_r)
+{
+	const char *cmd = args[0];
+
+	args++;
+
+	if (strcmp(cmd, "APPEND") == 0)
+		return indexer_client_request_queue(client, TRUE, args, error_r);
+	else if (strcmp(cmd, "PREPEND") == 0)
+		return indexer_client_request_queue(client, FALSE, args, error_r);
+	else if (strcmp(cmd, "OPTIMIZE") == 0)
+		return indexer_client_request_optimize(client, args, error_r);
+	else {
+		*error_r = t_strconcat("Unknown command: ", cmd, NULL);
+		return -1;
+	}
+}
+
+static int
+indexer_client_input_args(struct connection *conn, const char *const *args)
+{
+	struct indexer_client *client =
+		container_of(conn, struct indexer_client, conn);
+	const char *error;
+
+	if (indexer_client_request(client, args, &error) < 0) {
+		i_error("Client input error: %s", error);
+		return -1;
+	}
+	return 1;
+}
+
+void indexer_client_status_callback(int percentage, void *context)
+{
+	struct indexer_client_request *ctx = context;
+
+	if (ctx->client->conn.output != NULL) T_BEGIN {
+		o_stream_nsend_str(ctx->client->conn.output,
+			t_strdup_printf("%u\t%d\n", ctx->tag, percentage));
+	} T_END;
+	if (percentage < 0 || percentage == 100) {
+		indexer_client_unref(ctx->client);
+		i_free(ctx);
+	}
+}
+
+static struct connection_list *indexer_client_list = NULL;
+
+static const struct connection_vfuncs indexer_client_vfuncs = {
+	.destroy = indexer_client_destroy,
+	.input_args = indexer_client_input_args,
+};
+
+static const struct connection_settings indexer_client_set = {
+	.service_name_in = "indexer",
+	.service_name_out = "indexer",
+	.major_version = INDEXER_CLIENT_PROTOCOL_MAJOR_VERSION,
+	.minor_version = INDEXER_CLIENT_PROTOCOL_MINOR_VERSION,
+	.input_max_size = SIZE_MAX,
+	.output_max_size = IO_BLOCK_SIZE,
+};
+
+
+void indexer_client_create(struct master_service_connection *conn,
+			   struct indexer_queue *queue)
+{
+	struct indexer_client *client;
+
+	if (indexer_client_list == NULL) {
+		indexer_client_list =
+			connection_list_init(&indexer_client_set,
+					     &indexer_client_vfuncs);
+	}
+
+	client = i_new(struct indexer_client, 1);
+	client->refcount = 1;
+	client->queue = queue;
+	connection_init_server(indexer_client_list, &client->conn,
+			       conn->name, conn->fd, conn->fd);
+	indexer_refresh_proctitle();
+}
+
+static void indexer_client_destroy(struct connection *conn)
+{
+	struct indexer_client *client =
+		container_of(conn, struct indexer_client, conn);
+	connection_deinit(&client->conn);
+	master_service_client_connection_destroyed(master_service);
+	indexer_client_unref(client);
+	indexer_refresh_proctitle();
+}
+
+static void indexer_client_ref(struct indexer_client *client)
+{
+	i_assert(client->refcount > 0);
+
+	client->refcount++;
+}
+
+static void indexer_client_unref(struct indexer_client *client)
+{
+	i_assert(client->refcount > 0);
+
+	if (--client->refcount > 0)
+		return;
+	i_free(client);
+}
+
+unsigned int indexer_clients_get_count(void)
+{
+	if (indexer_client_list == NULL)
+		return 0;
+	return indexer_client_list->connections_count;
+}
+
+void indexer_clients_destroy_all(void)
+{
+	connection_list_deinit(&indexer_client_list);
+}
diff --git a/src/indexer/indexer-client.h b/src/indexer/indexer-client.h
new file mode 100644
index 0000000..609c678
--- /dev/null
+++ b/src/indexer/indexer-client.h
@@ -0,0 +1,13 @@
+#ifndef INDEXER_CLIENT_H
+#define INDEXER_CLIENT_H
+
+struct indexer_queue;
+
+void indexer_client_create(struct master_service_connection *conn,
+			   struct indexer_queue *queue);
+void indexer_client_status_callback(int percentage, void *context);
+
+unsigned int indexer_clients_get_count(void);
+void indexer_clients_destroy_all(void);
+
+#endif
diff --git a/src/indexer/indexer-queue.c b/src/indexer/indexer-queue.c
new file mode 100644
index 0000000..3532b8b
--- /dev/null
+++ b/src/indexer/indexer-queue.c
@@ -0,0 +1,275 @@
+/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "llist.h"
+#include "hash.h"
+#include "indexer-queue.h"
+
+struct indexer_queue {
+	indexer_queue_callback_t *callback;
+	void (*listen_callback)(struct indexer_queue *);
+
+	/* username+mailbox -> indexer_request */
+	HASH_TABLE(struct indexer_request *, struct indexer_request *) requests;
+	struct indexer_request *head, *tail;
+};
+
+static unsigned int
+indexer_request_hash(const struct indexer_request *request)
+{
+	return str_hash(request->username) ^ str_hash(request->mailbox);
+}
+
+static int indexer_request_cmp(const struct indexer_request *r1,
+			       const struct indexer_request *r2)
+{
+	return strcmp(r1->username, r2->username) == 0 &&
+		strcmp(r1->mailbox, r2->mailbox) == 0 ? 0 : 1;
+}
+
+struct indexer_queue *
+indexer_queue_init(indexer_queue_callback_t *callback)
+{
+	struct indexer_queue *queue;
+	
+	queue = i_new(struct indexer_queue, 1);
+	queue->callback = callback;
+	hash_table_create(&queue->requests, default_pool, 0,
+			  indexer_request_hash, indexer_request_cmp);
+	return queue;
+}
+
+void indexer_queue_deinit(struct indexer_queue **_queue)
+{
+	struct indexer_queue *queue = *_queue;
+
+	*_queue = NULL;
+
+	i_assert(indexer_queue_is_empty(queue));
+
+	hash_table_destroy(&queue->requests);
+	i_free(queue);
+}
+
+void indexer_queue_set_listen_callback(struct indexer_queue *queue,
+				       void (*callback)(struct indexer_queue *))
+{
+	queue->listen_callback = callback;
+}
+
+static struct indexer_request *
+indexer_queue_lookup(struct indexer_queue *queue,
+		     const char *username, const char *mailbox)
+{
+	struct indexer_request lookup_request;
+
+	lookup_request.username = (void *)username;
+	lookup_request.mailbox = (void *)mailbox;
+	return hash_table_lookup(queue->requests, &lookup_request);
+}
+
+static void request_add_context(struct indexer_request *request, void *context)
+{
+	if (context == NULL)
+		return;
+
+	if (!array_is_created(&request->contexts))
+		i_array_init(&request->contexts, 2);
+	array_push_back(&request->contexts, &context);
+}
+
+static struct indexer_request *
+indexer_queue_append_request(struct indexer_queue *queue, bool append,
+			     const char *username, const char *mailbox,
+			     const char *session_id,
+			     unsigned int max_recent_msgs, void *context)
+{
+	struct indexer_request *request;
+
+	request = indexer_queue_lookup(queue, username, mailbox);
+	if (request == NULL) {
+		request = i_new(struct indexer_request, 1);
+		request->username = i_strdup(username);
+		request->mailbox = i_strdup(mailbox);
+		request->session_id = i_strdup(session_id);
+		request->max_recent_msgs = max_recent_msgs;
+		request_add_context(request, context);
+		hash_table_insert(queue->requests, request, request);
+	} else {
+		if (request->max_recent_msgs > max_recent_msgs)
+			request->max_recent_msgs = max_recent_msgs;
+		request_add_context(request, context);
+		if (request->working) {
+			/* we're already indexing this mailbox. */
+			if (append)
+				request->reindex_tail = TRUE;
+			else
+				request->reindex_head = TRUE;
+			return request;
+		}
+		if (append) {
+			/* keep the request in its old position */
+			return request;
+		}
+		/* move request to beginning of the queue */
+		DLLIST2_REMOVE(&queue->head, &queue->tail, request);
+	}
+
+	if (append)
+		DLLIST2_APPEND(&queue->head, &queue->tail, request);
+	else
+		DLLIST2_PREPEND(&queue->head, &queue->tail, request);
+	return request;
+}
+
+static void indexer_queue_append_finish(struct indexer_queue *queue)
+{
+	if (queue->listen_callback != NULL)
+		queue->listen_callback(queue);
+	indexer_refresh_proctitle();
+}
+
+void indexer_queue_append(struct indexer_queue *queue, bool append,
+			  const char *username, const char *mailbox,
+			  const char *session_id, unsigned int max_recent_msgs,
+			  void *context)
+{
+	struct indexer_request *request;
+
+	request = indexer_queue_append_request(queue, append, username, mailbox,
+					       session_id, max_recent_msgs,
+					       context);
+	request->index = TRUE;
+	indexer_queue_append_finish(queue);
+}
+
+void indexer_queue_append_optimize(struct indexer_queue *queue,
+				   const char *username, const char *mailbox,
+				   void *context)
+{
+	struct indexer_request *request;
+
+	request = indexer_queue_append_request(queue, TRUE, username, mailbox,
+					       NULL, 0, context);
+	request->optimize = TRUE;
+	indexer_queue_append_finish(queue);
+}
+
+struct indexer_request *indexer_queue_request_peek(struct indexer_queue *queue)
+{
+	return queue->head;
+}
+
+void indexer_queue_request_remove(struct indexer_queue *queue)
+{
+	struct indexer_request *request = queue->head;
+
+	i_assert(request != NULL);
+
+	DLLIST2_REMOVE(&queue->head, &queue->tail, request);
+}
+
+static void indexer_queue_request_status_int(struct indexer_queue *queue,
+					     struct indexer_request *request,
+					     int percentage)
+{
+	void *context;
+	unsigned int i;
+
+	for (i = 0; i < request->working_context_idx; i++) {
+		context = array_idx_elem(&request->contexts, i);
+		queue->callback(percentage, context);
+	}
+}
+
+void indexer_queue_request_status(struct indexer_queue *queue,
+				  struct indexer_request *request,
+				  int percentage)
+{
+	i_assert(percentage >= 0 && percentage < 100);
+
+	indexer_queue_request_status_int(queue, request, percentage);
+}
+
+void indexer_queue_move_head_to_tail(struct indexer_queue *queue)
+{
+	struct indexer_request *request = queue->head;
+
+	indexer_queue_request_remove(queue);
+	DLLIST2_APPEND(&queue->head, &queue->tail, request);
+}
+
+void indexer_queue_request_work(struct indexer_request *request)
+{
+	request->working = TRUE;
+	request->working_context_idx =
+		!array_is_created(&request->contexts) ? 0 :
+		array_count(&request->contexts);
+}
+
+void indexer_queue_request_finish(struct indexer_queue *queue,
+				  struct indexer_request **_request,
+				  bool success)
+{
+	struct indexer_request *request = *_request;
+
+	*_request = NULL;
+
+	indexer_queue_request_status_int(queue, request, success ? 100 : -1);
+
+	if (request->reindex_head || request->reindex_tail) {
+		i_assert(request->working);
+		request->working = FALSE;
+		request->reindex_head = FALSE;
+		request->reindex_tail = FALSE;
+		if (request->working_context_idx > 0) {
+			array_delete(&request->contexts, 0,
+				     request->working_context_idx);
+		}
+		if (request->reindex_head)
+			DLLIST2_PREPEND(&queue->head, &queue->tail, request);
+		else
+			DLLIST2_APPEND(&queue->head, &queue->tail, request);
+		return;
+	}
+
+	hash_table_remove(queue->requests, request);
+	if (array_is_created(&request->contexts))
+		array_free(&request->contexts);
+	i_free(request->username);
+	i_free(request->mailbox);
+	i_free(request->session_id);
+	i_free(request);
+
+	indexer_refresh_proctitle();
+}
+
+void indexer_queue_cancel_all(struct indexer_queue *queue)
+{
+	struct indexer_request *request;
+	struct hash_iterate_context *iter;
+
+	/* remove all reindex-markers so when the current requests finish
+	   (or are cancelled) we don't try to retry them (especially during
+	   deinit where it crashes) */
+	iter = hash_table_iterate_init(queue->requests);
+	while (hash_table_iterate(iter, queue->requests, &request, &request))
+		request->reindex_head = request->reindex_tail = FALSE;
+	hash_table_iterate_deinit(&iter);
+
+	while ((request = indexer_queue_request_peek(queue)) != NULL) {
+		indexer_queue_request_remove(queue);
+		indexer_queue_request_finish(queue, &request, FALSE);
+	}
+}
+
+bool indexer_queue_is_empty(struct indexer_queue *queue)
+{
+	return queue->head == NULL;
+}
+
+unsigned int indexer_queue_count(struct indexer_queue *queue)
+{
+	return hash_table_count(queue->requests);
+}
diff --git a/src/indexer/indexer-queue.h b/src/indexer/indexer-queue.h
new file mode 100644
index 0000000..a9d5b9d
--- /dev/null
+++ b/src/indexer/indexer-queue.h
@@ -0,0 +1,72 @@
+#ifndef INDEXER_QUEUE_H
+#define INDEXER_QUEUE_H
+
+#include "indexer.h"
+
+typedef void indexer_queue_callback_t(int status, void *context);
+
+struct indexer_request {
+	struct indexer_request *prev, *next;
+
+	char *username;
+	char *mailbox;
+	char *session_id;
+	unsigned int max_recent_msgs;
+
+	/* index messages in this mailbox */
+	bool index:1;
+	/* optimize this mailbox */
+	bool optimize:1;
+	/* currently indexing this mailbox */
+	bool working:1;
+	/* after indexing is finished, add this request back to the queue and
+	   reindex it (i.e. a new indexing request came while we were
+	   working.) */
+	bool reindex_head:1;
+	bool reindex_tail:1;
+
+	/* when working finished, call this number of contexts and leave the
+	   rest to the reindexing. */
+	unsigned int working_context_idx;
+
+	ARRAY(void *) contexts;
+};
+
+struct indexer_queue *indexer_queue_init(indexer_queue_callback_t *callback);
+void indexer_queue_deinit(struct indexer_queue **queue);
+
+/* The callback is called whenever a new request is added to the queue. */
+void indexer_queue_set_listen_callback(struct indexer_queue *queue,
+				       void (*callback)(struct indexer_queue *));
+	
+void indexer_queue_append(struct indexer_queue *queue, bool append,
+			  const char *username, const char *mailbox,
+			  const char *session_id, unsigned int max_recent_msgs,
+			  void *context);
+void indexer_queue_append_optimize(struct indexer_queue *queue,
+				   const char *username, const char *mailbox,
+				   void *context);
+void indexer_queue_cancel_all(struct indexer_queue *queue);
+
+bool indexer_queue_is_empty(struct indexer_queue *queue);
+unsigned int indexer_queue_count(struct indexer_queue *queue);
+
+/* Return the next request from the queue, without removing it. */
+struct indexer_request *indexer_queue_request_peek(struct indexer_queue *queue);
+/* Remove the next request from the queue. You must call
+   indexer_queue_request_finish() to free its memory. */
+void indexer_queue_request_remove(struct indexer_queue *queue);
+/* Give a status update about how far the indexing is going on. */
+void indexer_queue_request_status(struct indexer_queue *queue,
+				  struct indexer_request *request,
+				  int percentage);
+/* Move the next request to the end of the queue. */
+void indexer_queue_move_head_to_tail(struct indexer_queue *queue);
+/* Start working on a request */
+void indexer_queue_request_work(struct indexer_request *request);
+/* Finish the request and free its memory. */
+void indexer_queue_request_finish(struct indexer_queue *queue,
+				  struct indexer_request **request,
+				  bool success);
+
+#endif
diff --git a/src/indexer/indexer-settings.c b/src/indexer/indexer-settings.c
new file mode 100644
index 0000000..8375829
--- /dev/null
+++ b/src/indexer/indexer-settings.c
@@ -0,0 +1,50 @@
+/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "buffer.h"
+#include "settings-parser.h"
+#include "service-settings.h"
+
+#include <stddef.h>
+
+extern const struct setting_parser_info service_setting_parser_info;
+
+/* <settings checks> */
+static struct file_listener_settings indexer_unix_listeners_array[] = {
+	{ "indexer", 0666, "", "" }
+};
+static struct file_listener_settings *indexer_unix_listeners[] = {
+	&indexer_unix_listeners_array[0]
+};
+static buffer_t indexer_unix_listeners_buf = {
+	{ { indexer_unix_listeners, sizeof(indexer_unix_listeners) } }
+};
+/* </settings checks> */
+
+struct service_settings indexer_service_settings = {
+	.name = "indexer",
+	.protocol = "",
+	.type = "",
+	.executable = "indexer",
+	.user = "$default_internal_user",
+	.group = "",
+	.privileged_group = "",
+	.extra_groups = "",
+	.chroot = "",
+
+	.drop_priv_before_exec = FALSE,
+
+	.process_min_avail = 0,
+	.process_limit = 1,
+	.client_limit = 0,
+	.service_count = 0,
+	.idle_kill = 0,
+	.vsz_limit = UOFF_T_MAX,
+
+	.unix_listeners = { { &indexer_unix_listeners_buf,
+			      sizeof(indexer_unix_listeners[0]) } },
+	.fifo_listeners = ARRAY_INIT,
+	.inet_listeners = ARRAY_INIT,
+
+	.process_limit_1 = TRUE
+};
diff --git a/src/indexer/indexer-worker-settings.c b/src/indexer/indexer-worker-settings.c
new file mode 100644
index 0000000..8627954
--- /dev/null
+++ b/src/indexer/indexer-worker-settings.c
@@ -0,0 +1,46 @@
+/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "buffer.h"
+#include "settings-parser.h"
+#include "service-settings.h"
+
+#include <stddef.h>
+
+/* <settings checks> */
+static struct file_listener_settings indexer_worker_unix_listeners_array[] = {
+	{ "indexer-worker", 0600, "$default_internal_user", "" }
+};
+static struct file_listener_settings *indexer_worker_unix_listeners[] = {
+	&indexer_worker_unix_listeners_array[0]
+};
+static buffer_t indexer_worker_unix_listeners_buf = {
+	{ { indexer_worker_unix_listeners, sizeof(indexer_worker_unix_listeners) } }
+};
+/* </settings checks> */
+
+struct service_settings indexer_worker_service_settings = {
+	.name = "indexer-worker",
+	.protocol = "",
+	.type = "worker",
+	.executable = "indexer-worker",
+	.user = "",
+	.group = "",
+	.privileged_group = "",
+	.extra_groups = "$default_internal_group",
+	.chroot = "",
+
+	.drop_priv_before_exec = FALSE,
+
+	.process_min_avail = 0,
+	.process_limit = 10,
+	.client_limit = 1,
+	.service_count = 0,
+	.idle_kill = 0,
+	.vsz_limit = UOFF_T_MAX,
+
+	.unix_listeners = { { &indexer_worker_unix_listeners_buf,
+			      sizeof(indexer_worker_unix_listeners[0]) } },
+	.fifo_listeners = ARRAY_INIT,
+	.inet_listeners = ARRAY_INIT
+};
diff --git a/src/indexer/indexer-worker.c b/src/indexer/indexer-worker.c
new file mode 100644
index 0000000..ef39aeb
--- /dev/null
+++ b/src/indexer/indexer-worker.c
@@ -0,0 +1,82 @@
+/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "restrict-access.h"
+#include "mail-storage-service.h"
+#include "mail-storage-settings.h"
+#include "master-service.h"
+#include "master-service-settings.h"
+#include "master-connection.h"
+
+static struct mail_storage_service_ctx *storage_service;
+
+static void client_connected(struct master_service_connection *conn)
+{
+	master_service_client_connection_accept(conn);
+
+	if (!master_connection_create(conn, storage_service)) {
+		i_error("indexer-worker must be configured with client_limit=1");
+		i_close_fd(&conn->fd);
+		master_service_client_connection_destroyed(master_service);
+	}
+}
+
+static void drop_privileges(void)
+{
+	struct restrict_access_settings set;
+	const char *error;
+
+	/* by default we don't drop any privileges, but keep running as root. */
+	restrict_access_get_env(&set);
+	if (set.uid != 0) {
+		/* open config connection before dropping privileges */
+		struct master_service_settings_input input;
+		struct master_service_settings_output output;
+
+		i_zero(&input);
+		input.module = "mail";
+		input.service = "indexer-worker";
+		(void)master_service_settings_read(master_service,
+						   &input, &output, &error);
+	}
+	restrict_access_by_env(RESTRICT_ACCESS_FLAG_ALLOW_ROOT, NULL);
+}
+
+int main(int argc, char *argv[])
+{
+	enum master_service_flags service_flags =
+		MASTER_SERVICE_FLAG_KEEP_CONFIG_OPEN;
+	enum mail_storage_service_flags storage_service_flags =
+		MAIL_STORAGE_SERVICE_FLAG_USERDB_LOOKUP |
+		MAIL_STORAGE_SERVICE_FLAG_TEMP_PRIV_DROP |
+		MAIL_STORAGE_SERVICE_FLAG_NO_IDLE_TIMEOUT;
+	int c;
+
+	master_service = master_service_init("indexer-worker", service_flags,
+					     &argc, &argv, "D");
+	while ((c = master_getopt(master_service)) > 0) {
+		switch (c) {
+		case 'D':
+			storage_service_flags |=
+				MAIL_STORAGE_SERVICE_FLAG_ENABLE_CORE_DUMPS;
+			break;
+		default:
+			return FATAL_DEFAULT;
+		}
+	}
+
+	drop_privileges();
+	master_service_init_log_with_pid(master_service);
+
+	storage_service = mail_storage_service_init(master_service, NULL,
+						    storage_service_flags);
+	restrict_access_allow_coredumps(TRUE);
+	master_service_init_finish(master_service);
+
+	master_service_run(master_service, client_connected);
+
+	master_connections_destroy();
+	mail_storage_service_deinit(&storage_service);
+	master_service_deinit(&master_service);
+        return 0;
+}
diff --git a/src/indexer/indexer.c b/src/indexer/indexer.c
new file mode 100644
index 0000000..6175b54
--- /dev/null
+++ b/src/indexer/indexer.c
@@ -0,0 +1,137 @@
+/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "restrict-access.h"
+#include "process-title.h"
+#include "master-service.h"
+#include "master-service-settings.h"
+#include "indexer-client.h"
+#include "indexer-queue.h"
+#include "worker-pool.h"
+#include "worker-connection.h"
+
+static const struct master_service_settings *set;
+static struct indexer_queue *queue;
+static struct worker_pool *worker_pool;
+
+void indexer_refresh_proctitle(void)
+{
+	if (!set->verbose_proctitle)
+		return;
+
+	process_title_set(t_strdup_printf("[%u clients, %u requests]",
+					  indexer_clients_get_count(),
+					  indexer_queue_count(queue)));
+}
+
+static bool idle_die(void)
+{
+	return indexer_queue_is_empty(queue) &&
+		!worker_pool_have_connections(worker_pool);
+}
+
+static void client_connected(struct master_service_connection *conn)
+{
+	master_service_client_connection_accept(conn);
+	indexer_client_create(conn, queue);
+}
+
+static void worker_send_request(struct connection *conn,
+				struct indexer_request *request)
+{
+	indexer_queue_request_work(request);
+	worker_connection_request(conn, request);
+}
+
+static void queue_try_send_more(struct indexer_queue *queue)
+{
+	struct connection *conn;
+	struct indexer_request *request, *first_moved_request = NULL;
+
+	while ((request = indexer_queue_request_peek(queue)) != NULL) {
+		conn = worker_pool_find_username_connection(worker_pool,
+							    request->username);
+		if (conn != NULL) {
+			/* There is already a connection handling a request
+			 * for this user. Move the request to the back of the
+			 * queue and handle requests from other users.
+			 * Terminate if we went through all requests. */
+			if (request == first_moved_request) {
+				/* all requests are waiting for existing users
+				   to finish. */
+				break;
+			}
+			if (first_moved_request == NULL)
+				first_moved_request = request;
+			indexer_queue_move_head_to_tail(queue);
+			continue;
+		} else {
+			/* create a new connection to a worker */
+			if (!worker_pool_get_connection(worker_pool, &conn))
+				break;
+		}
+		indexer_queue_request_remove(queue);
+		worker_send_request(conn, request);
+	}
+}
+
+static void queue_listen_callback(struct indexer_queue *queue)
+{
+	queue_try_send_more(queue);
+}
+
+static void
+worker_status_callback(int percentage, struct indexer_request *request)
+{
+	if (percentage >= 0 && percentage < 100) {
+		indexer_queue_request_status(queue, request,
+					     percentage);
+		return;
+	}
+
+	indexer_queue_request_finish(queue, &request,
+				     percentage == 100);
+}
+
+static void worker_avail_callback(void)
+{
+	/* A new worker became available. Try to shrink the queue. */
+	queue_try_send_more(queue);
+}
+
+int main(int argc, char *argv[])
+{
+	const char *error;
+
+	master_service = master_service_init("indexer", 0, &argc, &argv, "");
+	if (master_getopt(master_service) > 0)
+		return FATAL_DEFAULT;
+
+	if (master_service_settings_read_simple(master_service, NULL,
+						&error) < 0)
+		i_fatal("Error reading configuration: %s", error);
+	set = master_service_settings_get(master_service);
+
+	master_service_init_log(master_service);
+	restrict_access_by_env(RESTRICT_ACCESS_FLAG_ALLOW_ROOT, NULL);
+	restrict_access_allow_coredumps(TRUE);
+	master_service_set_idle_die_callback(master_service, idle_die);
+
+	queue = indexer_queue_init(indexer_client_status_callback);
+	indexer_queue_set_listen_callback(queue, queue_listen_callback);
+	worker_pool = worker_pool_init("indexer-worker",
+				       worker_status_callback,
+				       worker_avail_callback);
+	master_service_init_finish(master_service);
+
+	master_service_run(master_service, client_connected);
+
+	indexer_queue_cancel_all(queue);
+	indexer_clients_destroy_all();
+	worker_pool_deinit(&worker_pool);
+	indexer_queue_deinit(&queue);
+
+	master_service_deinit(&master_service);
+        return 0;
+}
diff --git a/src/indexer/indexer.h b/src/indexer/indexer.h
new file mode 100644
index 0000000..2234f2d
--- /dev/null
+++ b/src/indexer/indexer.h
@@ -0,0 +1,12 @@
+#ifndef INDEXER_H
+#define INDEXER_H
+
+struct indexer_request;
+
+/* percentage: -1 = failed, 0..99 = indexing in progress, 100 = done */
+typedef void
+indexer_status_callback_t(int percentage, struct indexer_request *request);
+
+void indexer_refresh_proctitle(void);
+
+#endif
diff --git a/src/indexer/master-connection.c b/src/indexer/master-connection.c
new file mode 100644
index 0000000..14f3c7d
--- /dev/null
+++ b/src/indexer/master-connection.c
@@ -0,0 +1,365 @@
+/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "connection.h"
+#include "ioloop.h"
+#include "istream.h"
+#include "ostream.h"
+#include "strescape.h"
+#include "process-title.h"
+#include "master-service.h"
+#include "master-service-settings.h"
+#include "mail-namespace.h"
+#include "mail-storage-private.h"
+#include "mail-storage-service.h"
+#include "mail-search-build.h"
+#include "master-connection.h"
+
+#include <unistd.h>
+
+#define INDEXER_PROTOCOL_MAJOR_VERSION 1
+#define INDEXER_PROTOCOL_MINOR_VERSION 0
+
+#define INDEXER_MASTER_NAME "indexer-master-worker"
+#define INDEXER_WORKER_NAME "indexer-worker-master"
+
+static struct event_category event_category_indexer_worker = {
+	.name = "indexer-worker",
+};
+
+struct master_connection {
+	struct connection conn;
+	struct mail_storage_service_ctx *storage_service;
+
+	bool version_received:1;
+};
+
+static void ATTR_NULL(1, 2)
+indexer_worker_refresh_proctitle(const char *username, const char *mailbox,
+				 uint32_t seq1, uint32_t seq2)
+{
+	if (!master_service_settings_get(master_service)->verbose_proctitle)
+		return;
+
+	if (username == NULL)
+		process_title_set("[idling]");
+	else if (seq1 == 0)
+		process_title_set(t_strdup_printf("[%s %s]", username, mailbox));
+	else {
+		process_title_set(t_strdup_printf("[%s %s - %u/%u]",
+						  username, mailbox, seq1, seq2));
+	}
+}
+
+static const char *
+get_attempt_error(unsigned int counter, uint32_t first_uid, uint32_t last_uid)
+{
+	if (counter == 0)
+		return " (no mails indexed)";
+	return t_strdup_printf(
+		" (attempted to index %u messages between UIDs %u..%u)",
+		counter, first_uid, last_uid);
+}
+
+static int
+index_mailbox_precache(struct master_connection *conn, struct mailbox *box)
+{
+	struct mail_storage *storage = mailbox_get_storage(box);
+	const char *username = mail_storage_get_user(storage)->username;
+	const char *box_vname = mailbox_get_vname(box);
+	const char *errstr;
+	enum mail_error error;
+	struct mailbox_status status;
+	struct mailbox_transaction_context *trans;
+	struct mail_search_args *search_args;
+	struct mail_search_context *ctx;
+	struct mail *mail;
+	struct mailbox_metadata metadata;
+	uint32_t seq, first_uid = 0, last_uid = 0;
+	char percentage_str[2+1+1];
+	unsigned int counter = 0, max, percentage, percentage_sent = 0;
+	int ret = 0;
+	struct event *index_event = event_create(box->event);
+	event_add_category(index_event, &event_category_indexer_worker);
+
+	if (mailbox_get_metadata(box, MAILBOX_METADATA_PRECACHE_FIELDS,
+				 &metadata) < 0) {
+		e_error(index_event, "Precache-fields lookup failed: %s",
+			mailbox_get_last_internal_error(box, NULL));
+		event_unref(&index_event);
+		return -1;
+	}
+	if (mailbox_get_status(box, STATUS_MESSAGES | STATUS_LAST_CACHED_SEQ,
+			       &status) < 0) {
+		e_error(index_event, "Status lookup failed: %s",
+			mailbox_get_last_internal_error(box, NULL));
+		event_unref(&index_event);
+		return -1;
+	}
+	seq = status.last_cached_seq + 1;
+
+	trans = mailbox_transaction_begin(box, MAILBOX_TRANSACTION_FLAG_NO_CACHE_DEC,
+					  "indexing");
+	search_args = mail_search_build_init();
+	mail_search_build_add_seqset(search_args, seq, status.messages);
+
+	event_enable_user_cpu_usecs(index_event);
+
+	ctx = mailbox_search_init(trans, search_args, NULL,
+				  metadata.precache_fields, NULL);
+	mail_search_args_unref(&search_args);
+
+	max = status.messages + 1 - seq;
+	while (mailbox_search_next(ctx, &mail)) {
+		if (first_uid == 0)
+			first_uid = mail->uid;
+		last_uid = mail->uid;
+		e_debug(index_event, "Indexing UID=%u", mail->uid);
+
+		if (mail_precache(mail) < 0) {
+			e_error(index_event, "Precache for UID=%u failed: %s%s",
+				mail->uid,
+				mailbox_get_last_internal_error(box, NULL),
+				get_attempt_error(counter, first_uid, last_uid));
+			ret = -1;
+			break;
+		}
+		if (++counter % 100 == 0) {
+			percentage = counter*100 / max;
+			if (percentage != percentage_sent && percentage < 100) {
+				percentage_sent = percentage;
+				if (i_snprintf(percentage_str,
+					       sizeof(percentage_str), "%u\n",
+					       percentage) < 0)
+					i_unreached();
+				o_stream_nsend_str(conn->conn.output,
+						   percentage_str);
+			}
+			indexer_worker_refresh_proctitle(username, box_vname,
+							 counter, max);
+		}
+	}
+	if (mailbox_search_deinit(&ctx) < 0) {
+		e_error(index_event, "Mail search failed: %s%s",
+			mailbox_get_last_internal_error(box, NULL),
+			get_attempt_error(counter, first_uid, last_uid));
+		ret = -1;
+	}
+	const char *uids = first_uid == 0 ? "" :
+		t_strdup_printf(" (UIDs %u..%u)", first_uid, last_uid);
+	event_add_int(index_event, "message_count", counter);
+	event_add_int(index_event, "first_uid", first_uid);
+	event_add_int(index_event, "last_uid", last_uid);
+
+#define FINISHED_EVENT_NAME "indexer_worker_indexing_finished"
+	if (mailbox_transaction_commit(&trans) < 0) {
+		struct event_passthrough *e = event_create_passthrough(index_event)->
+			set_name(FINISHED_EVENT_NAME);
+		errstr = t_strdup_printf("Transaction commit failed: %s",
+					 mailbox_get_last_internal_error(box, &error));
+		e->add_str("error", errstr);
+		const char *log_error = t_strdup_printf("%s (attempted to index %u messages%s)",
+							errstr, counter, uids);
+		if (error != MAIL_ERROR_NOTFOUND)
+			e_error(e->event(), "%s", log_error);
+		else
+			e_debug(e->event(), "%s", log_error);
+		ret = -1;
+	} else {
+		struct event_passthrough *e = event_create_passthrough(index_event)->
+			set_name(FINISHED_EVENT_NAME);
+		e_debug(e->event(), "Indexed %u messages%s", counter, uids);
+	}
+	event_unref(&index_event);
+	return ret;
+}
+
+static int
+index_mailbox(struct master_connection *conn, struct mail_user *user,
+	      const char *mailbox, unsigned int max_recent_msgs,
+	      const char *what)
+{
+	struct mail_namespace *ns;
+	struct mailbox *box;
+	struct mailbox_status status;
+	const char *path, *errstr;
+	enum mail_error error;
+	enum mailbox_sync_flags sync_flags = MAILBOX_SYNC_FLAG_FULL_READ;
+	int ret;
+
+	ns = mail_namespace_find(user->namespaces, mailbox);
+	box = mailbox_alloc(ns->list, mailbox, 0);
+	ret = mailbox_get_path_to(box, MAILBOX_LIST_PATH_TYPE_INDEX, &path);
+	if (ret < 0) {
+		errstr = mailbox_get_last_internal_error(box, &error);
+		if (error != MAIL_ERROR_NOTFOUND)
+			e_error(box->event, "Getting path failed: %s", errstr);
+		mailbox_free(&box);
+		return -1;
+	}
+	if (ret == 0) {
+		e_info(box->event, "Indexes disabled, skipping");
+		mailbox_free(&box);
+		return 0;
+	}
+	ret = 0;
+
+	if (max_recent_msgs != 0) {
+		/* index only if there aren't too many recent messages.
+		   don't bother syncing the mailbox, that alone can take a
+		   while with large maildirs. */
+		if (mailbox_open(box) < 0) {
+			errstr = mailbox_get_last_internal_error(box, &error);
+			if (error != MAIL_ERROR_NOTFOUND)
+				e_error(box->event, "Opening failed: %s",
+					errstr);
+			ret = -1;
+		} else {
+			mailbox_get_open_status(box, STATUS_RECENT, &status);
+		}
+		if (ret < 0 || status.recent > max_recent_msgs) {
+			mailbox_free(&box);
+			return ret;
+		}
+	}
+
+	if (strchr(what, 'o') != NULL)
+		sync_flags |= MAILBOX_SYNC_FLAG_OPTIMIZE;
+
+	if (mailbox_sync(box, sync_flags) < 0) {
+		errstr = mailbox_get_last_internal_error(box, &error);
+		if (error != MAIL_ERROR_NOTFOUND) {
+			e_error(box->event, "Syncing failed: %s", errstr);
+		} else {
+			e_debug(box->event, "Syncing failed: %s", errstr);
+		}
+		ret = -1;
+	} else if (strchr(what, 'i') != NULL) {
+		if (index_mailbox_precache(conn, box) < 0)
+			ret = -1;
+	}
+	mailbox_free(&box);
+	return ret;
+}
+
+static int
+master_connection_input_args(struct connection *_conn, const char *const *args)
+{
+	struct master_connection *conn =
+		container_of(_conn, struct master_connection, conn);
+	struct mail_storage_service_input input;
+	struct mail_storage_service_user *service_user;
+	struct mail_user *user;
+	const char *str, *error;
+	unsigned int max_recent_msgs;
+	int ret;
+
+	/* <username> <mailbox> <session ID> <max_recent_msgs> [i][o] */
+	if (str_array_length(args) != 5 ||
+	    str_to_uint(args[3], &max_recent_msgs) < 0 || args[4][0] == '\0') {
+		e_error(conn->conn.event, "Invalid input from master: %s",
+			t_strarray_join(args, "\t"));
+		return -1;
+	}
+
+	i_zero(&input);
+	input.module = "mail";
+	input.service = "indexer-worker";
+	input.username = args[0];
+	/* if session-id is given, use it as a prefix to a unique session ID.
+	   we can't use the session-id directly or stats process will complain
+	   about duplicates. (especially LMTP would use the same session-id for
+	   multiple users' indexing at the same time.) */
+	if (args[2][0] != '\0')
+		input.session_id_prefix = args[2];
+
+	if (mail_storage_service_lookup_next(conn->storage_service, &input,
+					     &service_user, &user, &error) <= 0) {
+		e_error(conn->conn.event, "User %s lookup failed: %s", args[0], error);
+		ret = -1;
+	} else {
+		indexer_worker_refresh_proctitle(user->username, args[1], 0, 0);
+		struct event_reason *reason =
+			event_reason_begin("indexer:index_mailbox");
+		ret = index_mailbox(conn, user, args[1],
+				    max_recent_msgs, args[4]);
+		event_reason_end(&reason);
+		/* refresh proctitle before a potentially long-running
+		   user unref */
+		indexer_worker_refresh_proctitle(user->username, "(deinit)", 0, 0);
+		mail_user_deinit(&user);
+		mail_storage_service_user_unref(&service_user);
+		indexer_worker_refresh_proctitle(NULL, NULL, 0, 0);
+	}
+
+	str = ret < 0 ? "-1\n" : "100\n";
+	o_stream_nsend_str(conn->conn.output, str);
+	return ret;
+}
+
+static void master_connection_destroy(struct connection *connection)
+{
+	connection_deinit(connection);
+	i_free(connection);
+	master_service_client_connection_destroyed(master_service);
+}
+
+static int master_connection_handshake_args(struct connection *connection,
+					    const char *const *args)
+{
+	int ret;
+	if ((ret = connection_handshake_args_default(connection, args)) < 1)
+		return ret;
+	const char *limit = t_strdup_printf("%u\n",
+		master_service_get_process_limit(master_service));
+	o_stream_nsend_str(connection->output, limit);
+	return 1;
+}
+
+static struct connection_list *master_connection_list = NULL;
+
+static const struct connection_vfuncs master_connection_vfuncs = {
+	.destroy = master_connection_destroy,
+	.input_args = master_connection_input_args,
+	.handshake_args = master_connection_handshake_args,
+};
+
+static const struct connection_settings master_connection_set = {
+	.service_name_in = INDEXER_MASTER_NAME,
+	.service_name_out = INDEXER_WORKER_NAME,
+	.major_version = INDEXER_PROTOCOL_MAJOR_VERSION,
+	.minor_version = INDEXER_PROTOCOL_MINOR_VERSION,
+	.input_max_size = SIZE_MAX,
+	.output_max_size = SIZE_MAX,
+};
+
+bool
+master_connection_create(struct master_service_connection *master,
+			 struct mail_storage_service_ctx *storage_service)
+{
+	struct master_connection *conn;
+
+	if (master_connection_list == NULL) {
+		master_connection_list =
+			connection_list_init(&master_connection_set,
+					     &master_connection_vfuncs);
+	} else if (master_connection_list->connections_count > 0) {
+		return FALSE;
+	}
+
+	conn = i_new(struct master_connection, 1);
+	conn->storage_service = storage_service;
+	conn->conn.event_parent = event_create(NULL);
+	event_add_category(conn->conn.event_parent, &event_category_indexer_worker);
+	connection_init_server(master_connection_list, &conn->conn,
+			       master->name, master->fd, master->fd);
+
+	event_unref(&conn->conn.event_parent);
+	return TRUE;
+}
+
+void master_connections_destroy(void)
+{
+	if (master_connection_list != NULL)
+		connection_list_deinit(&master_connection_list);
+}
diff --git a/src/indexer/master-connection.h b/src/indexer/master-connection.h
new file mode 100644
index 0000000..7dcb70e
--- /dev/null
+++ b/src/indexer/master-connection.h
@@ -0,0 +1,8 @@
+#ifndef MASTER_CONNECTION_H
+#define MASTER_CONNECTION_H
+
+bool master_connection_create(struct master_service_connection *conn,
+			      struct mail_storage_service_ctx *storage_service);
+void master_connections_destroy(void);
+
+#endif
diff --git a/src/indexer/worker-connection.c b/src/indexer/worker-connection.c
new file mode 100644
index 0000000..19e2a41
--- /dev/null
+++ b/src/indexer/worker-connection.c
@@ -0,0 +1,196 @@
+/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "aqueue.h"
+#include "connection.h"
+#include "ioloop.h"
+#include "istream.h"
+#include "llist.h"
+#include "ostream.h"
+#include "str.h"
+#include "strescape.h"
+#include "master-service.h"
+#include "indexer-queue.h"
+#include "worker-connection.h"
+
+#include <unistd.h>
+
+#define INDEXER_PROTOCOL_MAJOR_VERSION 1
+#define INDEXER_PROTOCOL_MINOR_VERSION 0
+
+#define INDEXER_MASTER_NAME "indexer-master-worker"
+#define INDEXER_WORKER_NAME "indexer-worker-master"
+
+struct worker_connection {
+	struct connection conn;
+
+	indexer_status_callback_t *callback;
+	worker_available_callback_t *avail_callback;
+
+	char *request_username;
+	struct indexer_request *request;
+};
+
+static unsigned int worker_last_process_limit = 0;
+
+static void worker_connection_call_callback(struct worker_connection *worker,
+					    int percentage)
+{
+	if (worker->request != NULL)
+		worker->callback(percentage, worker->request);
+	if (percentage < 0 || percentage == 100)
+		worker->request = NULL;
+}
+
+void worker_connection_destroy(struct connection *conn)
+{
+	struct worker_connection *worker =
+		container_of(conn, struct worker_connection, conn);
+
+	worker_connection_call_callback(worker, -1);
+	i_free_and_null(worker->request_username);
+	connection_deinit(conn);
+
+	worker->avail_callback();
+	i_free(conn);
+}
+
+static int
+worker_connection_handshake_args(struct connection *conn, const char *const *args)
+{
+	unsigned int process_limit;
+	int ret;
+	if (!conn->version_received) {
+		if ((ret = connection_handshake_args_default(conn, args)) < 1)
+			return ret;
+		/* we are not done yet */
+		return 0;
+	}
+	if (str_to_uint(args[0], &process_limit) < 0 ||
+	    process_limit == 0) {
+		e_error(conn->event, "Worker sent invalid process limit '%s'",
+			args[0]);
+		return -1;
+	}
+	worker_last_process_limit = process_limit;
+	return 1;
+}
+
+static int
+worker_connection_input_args(struct connection *conn, const char *const *args)
+{
+	struct worker_connection *worker =
+		container_of(conn, struct worker_connection, conn);
+	int percentage;
+	int ret = 1;
+
+	if (str_to_int(args[0], &percentage) < 0 ||
+	    percentage < -1 || percentage > 100) {
+		e_error(conn->event, "Worker sent invalid progress '%s'", args[0]);
+		return -1;
+	}
+
+	if (percentage < 0)
+		ret = -1;
+
+	worker_connection_call_callback(worker, percentage);
+	if (worker->request == NULL) {
+		/* disconnect after each request */
+		ret = -1;
+	}
+
+	return ret;
+}
+
+bool worker_connection_is_connected(struct connection *conn)
+{
+	return !conn->disconnected;
+}
+
+unsigned int worker_connections_get_process_limit(void)
+{
+	return worker_last_process_limit;
+}
+
+void worker_connection_request(struct connection *conn,
+			       struct indexer_request *request)
+{
+	struct worker_connection *worker =
+		container_of(conn, struct worker_connection, conn);
+
+	i_assert(worker_connection_is_connected(conn));
+	i_assert(request->index || request->optimize);
+
+	if (worker->request_username == NULL)
+		worker->request_username = i_strdup(request->username);
+	else {
+		i_assert(strcmp(worker->request_username,
+				request->username) == 0);
+	}
+
+	worker->request = request;
+
+	T_BEGIN {
+		string_t *str = t_str_new(128);
+
+		str_append_tabescaped(str, request->username);
+		str_append_c(str, '\t');
+		str_append_tabescaped(str, request->mailbox);
+		str_append_c(str, '\t');
+		if (request->session_id != NULL)
+			str_append_tabescaped(str, request->session_id);
+		str_printfa(str, "\t%u\t", request->max_recent_msgs);
+		if (request->index)
+			str_append_c(str, 'i');
+		if (request->optimize)
+			str_append_c(str, 'o');
+		str_append_c(str, '\n');
+		o_stream_nsend(conn->output, str_data(str), str_len(str));
+	} T_END;
+}
+
+const char *worker_connection_get_username(struct connection *conn)
+{
+	struct worker_connection *worker =
+		container_of(conn, struct worker_connection, conn);
+	return worker->request_username;
+}
+
+static const struct connection_vfuncs worker_connection_vfuncs = {
+	.destroy = worker_connection_destroy,
+	.input_args = worker_connection_input_args,
+	.handshake_args = worker_connection_handshake_args,
+};
+
+static const struct connection_settings worker_connection_set = {
+	.service_name_in = INDEXER_WORKER_NAME,
+	.service_name_out = INDEXER_MASTER_NAME,
+	.major_version = INDEXER_PROTOCOL_MAJOR_VERSION,
+	.minor_version = INDEXER_PROTOCOL_MINOR_VERSION,
+	.input_max_size = SIZE_MAX,
+	.output_max_size = SIZE_MAX,
+	.client = TRUE,
+};
+
+struct connection_list *worker_connection_list_create(void)
+{
+	return connection_list_init(&worker_connection_set,
+				    &worker_connection_vfuncs);
+}
+
+struct connection *
+worker_connection_create(const char *socket_path,
+			 indexer_status_callback_t *callback,
+			 worker_available_callback_t *avail_callback,
+			 struct connection_list *list)
+{
+	struct worker_connection *conn;
+
+	conn = i_new(struct worker_connection, 1);
+	conn->callback = callback;
+	conn->avail_callback = avail_callback;
+	connection_init_client_unix(list, &conn->conn, socket_path);
+
+	return &conn->conn;
+}
diff --git a/src/indexer/worker-connection.h b/src/indexer/worker-connection.h
new file mode 100644
index 0000000..e664c7e
--- /dev/null
+++ b/src/indexer/worker-connection.h
@@ -0,0 +1,36 @@
+#ifndef WORKER_CONNECTION_H
+#define WORKER_CONNECTION_H
+
+#include "indexer.h"
+
+struct indexer_request;
+struct connection_list;
+
+typedef void worker_available_callback_t(void);
+
+struct connection *
+worker_connection_create(const char *socket_path,
+			 indexer_status_callback_t *callback,
+			 worker_available_callback_t *avail_callback,
+			 struct connection_list *list);
+void worker_connection_destroy(struct connection *conn);
+
+struct connection_list *worker_connection_list_create(void);
+
+/* Returns TRUE if worker is connected to (not necessarily handshaked yet) */
+bool worker_connection_is_connected(struct connection *conn);
+
+/* Returns the last process_limit returned by a worker connection handshake.
+   If no handshakes have been received yet, returns 0. */
+unsigned int worker_connections_get_process_limit(void);
+
+/* Send a new indexing request for username+mailbox. The status callback is
+   called as necessary. Requests can be queued, but only for the same
+   username. */
+void worker_connection_request(struct connection *conn,
+			       struct indexer_request *request);
+/* Returns username of the currently pending requests,
+   or NULL if there are none. */
+const char *worker_connection_get_username(struct connection *conn);
+
+#endif
diff --git a/src/indexer/worker-pool.c b/src/indexer/worker-pool.c
new file mode 100644
index 0000000..e0de136
--- /dev/null
+++ b/src/indexer/worker-pool.c
@@ -0,0 +1,98 @@
+/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "llist.h"
+#include "connection.h"
+#include "master-service.h"
+#include "worker-connection.h"
+#include "worker-pool.h"
+
+#define MAX_WORKER_IDLE_SECS (60*5)
+
+struct worker_pool {
+	char *socket_path;
+	indexer_status_callback_t *callback;
+	worker_available_callback_t *avail_callback;
+
+	struct connection_list *connection_list;
+};
+
+struct worker_pool *
+worker_pool_init(const char *socket_path, indexer_status_callback_t *callback,
+		 worker_available_callback_t *avail_callback)
+{
+	struct worker_pool *pool;
+
+	pool = i_new(struct worker_pool, 1);
+	pool->socket_path = i_strdup(socket_path);
+	pool->callback = callback;
+	pool->avail_callback = avail_callback;
+	pool->connection_list = worker_connection_list_create();
+	return pool;
+}
+
+void worker_pool_deinit(struct worker_pool **_pool)
+{
+	struct worker_pool *pool = *_pool;
+
+	*_pool = NULL;
+
+	if (pool->connection_list != NULL)
+		connection_list_deinit(&pool->connection_list);
+
+	i_free(pool->connection_list);
+	i_free(pool->socket_path);
+	i_free(pool);
+}
+
+bool worker_pool_have_connections(struct worker_pool *pool)
+{
+	return pool->connection_list->connections != NULL;
+}
+
+static int worker_pool_add_connection(struct worker_pool *pool,
+				      struct connection **conn_r)
+{
+	struct connection *conn;
+
+	conn = worker_connection_create(pool->socket_path, pool->callback,
+					pool->avail_callback,
+					pool->connection_list);
+	if (connection_client_connect(conn) < 0) {
+		worker_connection_destroy(conn);
+		return -1;
+	}
+
+	*conn_r = conn;
+	return 0;
+}
+
+bool worker_pool_get_connection(struct worker_pool *pool,
+				struct connection **conn_r)
+{
+	unsigned int max_connections;
+
+	max_connections = I_MAX(1, worker_connections_get_process_limit());
+	if (pool->connection_list->connections_count >= max_connections)
+		return FALSE;
+	if (worker_pool_add_connection(pool, conn_r) < 0)
+		return FALSE;
+
+	return TRUE;
+}
+
+struct connection *
+worker_pool_find_username_connection(struct worker_pool *pool,
+				     const char *username)
+{
+	struct connection *list;
+	const char *worker_user;
+
+	for (list = pool->connection_list->connections; list != NULL; list = list->next) {
+		worker_user = worker_connection_get_username(list);
+		if (worker_user != NULL && strcmp(worker_user, username) == 0)
+			return list;
+	}
+	return NULL;
+}
diff --git a/src/indexer/worker-pool.h b/src/indexer/worker-pool.h
new file mode 100644
index 0000000..bf739bb
--- /dev/null
+++ b/src/indexer/worker-pool.h
@@ -0,0 +1,23 @@
+#ifndef WORKER_POOL_H
+#define WORKER_POOL_H
+
+#include "indexer.h"
+#include "worker-connection.h"
+
+struct connection;
+
+struct worker_pool *
+worker_pool_init(const char *socket_path, indexer_status_callback_t *callback,
+		 worker_available_callback_t *avail_callback);
+void worker_pool_deinit(struct worker_pool **pool);
+
+bool worker_pool_have_connections(struct worker_pool *pool);
+
+bool worker_pool_get_connection(struct worker_pool *pool,
+				struct connection **conn_r);
+
+struct connection *
+worker_pool_find_username_connection(struct worker_pool *pool,
+				     const char *username);
+
+#endif