Implementation of batch upsert

Batch upsert is mostly used for operation with
one bucket / one Tarantool node in a transaction.
In this case batch upsert is more efficient
then upserting tuple-by-tuple.
Right now CRUD cannot provide batch upsert with full consistency.
CRUD offers batch upsert with partial consistency. That means
that full consistency can be provided only on single replicaset
using `box` transactions.

Part of #193

README.md

@@ -22,6 +22,7 @@ It also provides the `crud-storage` and `crud-router` roles for
   - [Delete](#delete)
   - [Replace](#replace)
   - [Upsert](#upsert)
+  - [Upsert many](#upsert-many)
   - [Select](#select)
     - [Select conditions](#select-conditions)
   - [Pairs](#pairs)
@@ -524,6 +525,100 @@ crud.upsert_object('customers',
 ...
 ```
 
+### Upsert many
+
+```lua
+-- Upsert batch of tuples
+local result, err = crud.upsert_many(space_name, tuples, operations, opts)
+-- Upsert batch of objects
+local result, err = crud.upsert_object_many(space_name, objects, operations, opts)
+```
+
+where:
+
+* `space_name` (`string`) - name of the space to insert an object
+* `tuples` / `objects` (`table`) - array of tuples/objects to insert
+* `operations` (`table`) - update [operations](https://www.tarantool.io/en/doc/latest/reference/reference_lua/box_space/#box-space-update) if there is an existing tuple which matches the key fields of tuple  
+* `opts`:
+  * `timeout` (`?number`) - `vshard.call` timeout (in seconds)
+  * `fields` (`?table`) - field names for getting only a subset of fields
+  * `stop_on_error` (`?boolean`) - stop on a first error and report error
+    regarding the failed operation and error about what tuples were not
+    performed, default is `false`
+  * `rollback_on_error` (`?boolean`) - any failed operation will lead to
+    rollback on a storage, where the operation is failed, report error
+    about what tuples were rollback, default is `false`
+
+Returns metadata and array of empty arrays, array of errors.
+Error object can contain field `operation_data`.
+
+This field can contain:
+* tuple for which the error occurred;
+* object with an incorrect format;
+* tuple the operation on which was performed but
+  operation was rollback;
+* tuple the operation on which was not performed
+  because operation was stopped by error.
+
+Right now CRUD cannot provide batch upsert with full consistency.
+CRUD offers batch upsert with partial consistency. That means
+that full consistency can be provided only on single replicaset
+using `box` transactions.
+
+**Example:**
+
+```lua
+crud.upsert_many('customers', {
+  {1, box.NULL, 'Elizabeth', 23},
+  {2, box.NULL, 'Anastasia', 22},
+},{{'+', 'age', 1}, {'+', 'age', 2}})
+---
+- metadata:
+  - {'name': 'id', 'type': 'unsigned'}
+  - {'name': 'bucket_id', 'type': 'unsigned'}
+  - {'name': 'name', 'type': 'string'}
+  - {'name': 'age', 'type': 'number'}
+  rows:
+  - []
+  - []
+...
+crud.upsert_object_many('customers', {
+    {id = 3, name = 'Elizabeth', age = 24},
+    {id = 10, name = 'Anastasia', age = 21},
+}, {{'+', 'age', 1}, {'+', 'age', 2}})
+---
+- metadata:
+  - {'name': 'id', 'type': 'unsigned'}
+  - {'name': 'bucket_id', 'type': 'unsigned'}
+  - {'name': 'name', 'type': 'string'}
+  - {'name': 'age', 'type': 'number'}
+  rows:
+  - []
+  - []
+
+-- Partial success
+local res, errs = crud.upsert_object_many('customers', {
+    {id = 22, name = 'Alex', age = 34},
+    {id = 3, name = 'Anastasia', age = 22},
+    {id = 5, name = 'Sergey', age = 25},
+}, {{'+', 'age', 12}, {'=', 'age', 'invalid type'}, {'+', 'age', 10}})
+---
+res
+- metadata:
+  - {'name': 'id', 'type': 'unsigned'}
+  - {'name': 'bucket_id', 'type': 'unsigned'}
+  - {'name': 'name', 'type': 'string'}
+  - {'name': 'age', 'type': 'number'}
+  rows:
+  - [],
+  - [],
+
+#errs              -- 1
+errs[1].class_name -- BatchUpsertError
+errs[1].err        -- 'Tuple field 4 (age) type does not match one required by operation <...>'
+errs[1].tuple      -- {3, 2804, 'Anastasia', 22}
+...
+```
 
 ### Select
 

crud.lua

@@ -9,6 +9,7 @@ local replace = require('crud.replace')
 local get = require('crud.get')
 local update = require('crud.update')
 local upsert = require('crud.upsert')
+local upsert_many = require('crud.upsert_many')
 local delete = require('crud.delete')
 local select = require('crud.select')
 local truncate = require('crud.truncate')
@@ -60,6 +61,14 @@ crud.update = stats.wrap(update.call, stats.op.UPDATE)
 -- @function upsert
 crud.upsert = stats.wrap(upsert.tuple, stats.op.UPSERT)
 
+-- @refer upsert_many.tuples
+-- @function upsert_many
+crud.upsert_many = upsert_many.tuples
+
+-- @refer upsert_many.objects
+-- @function upsert_object_many
+crud.upsert_object_many = upsert_many.objects
+
 -- @refer upsert.object
 -- @function upsert
 crud.upsert_object = stats.wrap(upsert.object, stats.op.UPSERT)
@@ -138,6 +147,7 @@ function crud.init_storage()
     replace.init()
     update.init()
     upsert.init()
+    upsert_many.init()
     delete.init()
     select.init()
     truncate.init()

crud/common/map_call_cases/batch_insert_iter.lua

@@ -70,7 +70,7 @@ function BatchInsertIterator:get()
     local replicaset = self.next_index
     local func_args = {
         self.space_name,
-        self.next_batch,
+        self.next_batch.tuples,
         self.opts,
     }
 

crud/common/map_call_cases/batch_upsert_iter.lua

@@ -0,0 +1,88 @@
+local errors = require('errors')
+
+local dev_checks = require('crud.common.dev_checks')
+local sharding = require('crud.common.sharding')
+
+local BaseIterator = require('crud.common.map_call_cases.base_iter')
+
+local SplitTuplesError = errors.new_class('SplitTuplesError')
+
+local BatchUpsertIterator = {}
+-- inheritance from BaseIterator
+setmetatable(BatchUpsertIterator, {__index = BaseIterator})
+
+--- Create new batch upsert iterator for map call
+--
+-- @function new
+--
+-- @tparam[opt] table opts
+-- Options of BatchUpsertIterator:new
+-- @tparam[opt] table opts.tuples
+-- Tuples to be upserted
+-- @tparam[opt] table opts.space
+-- Space to be upserted into
+-- @tparam[opt] table opts.operations
+-- Operations to be performed on tuples
+-- @tparam[opt] table opts.execute_on_storage_opts
+-- Additional opts for call on storage
+--
+-- @return[1] table iterator
+-- @treturn[2] nil
+-- @treturn[2] table of tables Error description
+function BatchUpsertIterator:new(opts)
+    dev_checks('table', {
+        tuples = 'table',
+        space = 'table',
+        operations = 'table',
+        execute_on_storage_opts = 'table',
+    })
+
+    local sharding_data, err = sharding.split_tuples_by_replicaset(opts.tuples, opts.space, {
+        operations = opts.operations,
+    })
+    if err ~= nil then
+        return nil, SplitTuplesError:new("Failed to split tuples by replicaset: %s", err.err)
+    end
+
+    local next_replicaset, next_batch = next(sharding_data.batches)
+
+    local execute_on_storage_opts = opts.execute_on_storage_opts
+    execute_on_storage_opts.sharding_func_hash = sharding_data.sharding_func_hash
+    execute_on_storage_opts.sharding_key_hash = sharding_data.sharding_key_hash
+    execute_on_storage_opts.skip_sharding_hash_check = sharding_data.skip_sharding_hash_check
+
+    local iter = {
+        space_name = opts.space.name,
+        opts = execute_on_storage_opts,
+        batches_by_replicasets = sharding_data.batches,
+        next_index = next_replicaset,
+        next_batch = next_batch,
+    }
+
+    setmetatable(iter, self)
+    self.__index = self
+
+    return iter
+end
+
+--- Get function arguments and next replicaset
+--
+-- @function get
+--
+-- @return[1] table func_args
+-- @return[2] table replicaset
+function BatchUpsertIterator:get()
+    local replicaset = self.next_index
+    local func_args = {
+        self.space_name,
+        self.next_batch.tuples,
+        self.next_batch.operations,
+        self.opts,
+    }
+
+    self.next_index, self.next_batch = next(self.batches_by_replicasets, self.next_index)
+
+    return func_args, replicaset
+end
+
+return BatchUpsertIterator

crud/common/sharding/init.lua

@@ -209,8 +209,12 @@ end
 -- @return[1] batches
 --  Map where key is a replicaset and value
 --  is table of tuples related to this replicaset
-function sharding.split_tuples_by_replicaset(tuples, space)
-    dev_checks('table', 'table')
+function sharding.split_tuples_by_replicaset(tuples, space, opts)
+    dev_checks('table', 'table', {
+        operations = '?table',
+    })
+
+    opts = opts or {}
 
     local batches = {}
 
@@ -219,7 +223,7 @@ function sharding.split_tuples_by_replicaset(tuples, space)
     local skip_sharding_hash_check
     local sharding_data
     local err
-    for _, tuple in ipairs(tuples) do
+    for i, tuple in ipairs(tuples) do
         sharding_data, err = sharding.tuple_set_and_return_bucket_id(tuple, space)
         if err ~= nil then
             return nil, BucketIDError:new("Failed to get bucket ID: %s", err)
@@ -244,9 +248,15 @@ function sharding.split_tuples_by_replicaset(tuples, space)
                     sharding_data.bucket_id, err.err)
         end
 
-        local tuples_by_replicaset = batches[replicaset] or {}
-        table.insert(tuples_by_replicaset, tuple)
-        batches[replicaset] = tuples_by_replicaset
+        local record_by_replicaset = batches[replicaset] or {tuples = {}}
+        table.insert(record_by_replicaset.tuples, tuple)
+
+        if opts.operations ~= nil then
+            record_by_replicaset.operations = record_by_replicaset.operations or {}
+            table.insert(record_by_replicaset.operations, opts.operations[i])
+        end
+
+        batches[replicaset] = record_by_replicaset
     end
 
     return {