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lightning: refactor to reuse in load data, part1 (#42469)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,15 @@ | ||
| load("@io_bazel_rules_go//go:def.bzl", "go_library") | ||
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| go_library( | ||
| name = "encode", | ||
| srcs = ["encode.go"], | ||
| importpath = "github.com/pingcap/tidb/br/pkg/lightning/backend/encode", | ||
| visibility = ["//visibility:public"], | ||
| deps = [ | ||
| "//br/pkg/lightning/log", | ||
| "//br/pkg/lightning/verification", | ||
| "//parser/mysql", | ||
| "//table", | ||
| "//types", | ||
| ], | ||
| ) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| // Copyright 2023 PingCAP, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| package encode | ||
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| import ( | ||
| "context" | ||
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| "github.com/pingcap/tidb/br/pkg/lightning/log" | ||
| "github.com/pingcap/tidb/br/pkg/lightning/verification" | ||
| "github.com/pingcap/tidb/parser/mysql" | ||
| "github.com/pingcap/tidb/table" | ||
| "github.com/pingcap/tidb/types" | ||
| ) | ||
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| type EncodingConfig struct { | ||
| SessionOptions | ||
| Path string // path of data file | ||
| Table table.Table | ||
| Logger log.Logger | ||
| } | ||
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| // EncodingBuilder consists of operations to handle encoding backend row data formats from source. | ||
| type EncodingBuilder interface { | ||
| // NewEncoder creates an encoder of a TiDB table. | ||
| NewEncoder(ctx context.Context, config *EncodingConfig) (Encoder, error) | ||
| // MakeEmptyRows creates an empty collection of encoded rows. | ||
| MakeEmptyRows() Rows | ||
| } | ||
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| // Encoder encodes a row of SQL values into some opaque type which can be | ||
| // consumed by OpenEngine.WriteEncoded. | ||
| type Encoder interface { | ||
| // Close the encoder. | ||
| Close() | ||
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| // Encode encodes a row of SQL values into a backend-friendly format. | ||
| Encode(row []types.Datum, rowID int64, columnPermutation []int, offset int64) (Row, error) | ||
| } | ||
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| // SessionOptions is the initial configuration of the session. | ||
| type SessionOptions struct { | ||
| SQLMode mysql.SQLMode | ||
| Timestamp int64 | ||
| SysVars map[string]string | ||
| // a seed used for tableKvEncoder's auto random bits value | ||
| AutoRandomSeed int64 | ||
| // IndexID is used by the DuplicateManager. Only the key range with the specified index ID is scanned. | ||
| IndexID int64 | ||
| } | ||
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| // Rows represents a collection of encoded rows. | ||
| type Rows interface { | ||
| // SplitIntoChunks splits the rows into multiple consecutive parts, each | ||
| // part having total byte size less than `splitSize`. The meaning of "byte | ||
| // size" should be consistent with the value used in `Row.ClassifyAndAppend`. | ||
| SplitIntoChunks(splitSize int) []Rows | ||
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| // Clear returns a new collection with empty content. It may share the | ||
| // capacity with the current instance. The typical usage is `x = x.Clear()`. | ||
| Clear() Rows | ||
| } | ||
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| // Row represents a single encoded row. | ||
| type Row interface { | ||
| // ClassifyAndAppend separates the data-like and index-like parts of the | ||
| // encoded row, and appends these parts into the existing buffers and | ||
| // checksums. | ||
| ClassifyAndAppend( | ||
| data *Rows, | ||
| dataChecksum *verification.KVChecksum, | ||
| indices *Rows, | ||
| indexChecksum *verification.KVChecksum, | ||
| ) | ||
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| // Size represents the total kv size of this Row. | ||
| Size() uint64 | ||
| } |
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