diff options
Diffstat (limited to 'vendor/github.com/mattermost/gorp/db.go')
| -rw-r--r-- | vendor/github.com/mattermost/gorp/db.go | 803 |
1 files changed, 803 insertions, 0 deletions
diff --git a/vendor/github.com/mattermost/gorp/db.go b/vendor/github.com/mattermost/gorp/db.go new file mode 100644 index 000000000..8a65fbe49 --- /dev/null +++ b/vendor/github.com/mattermost/gorp/db.go @@ -0,0 +1,803 @@ +// Copyright 2012 James Cooper. All rights reserved. +// Use of this source code is governed by a MIT-style +// license that can be found in the LICENSE file. + +// Package gorp provides a simple way to marshal Go structs to and from +// SQL databases. It uses the database/sql package, and should work with any +// compliant database/sql driver. +// +// Source code and project home: +// https://github.com/go-gorp/gorp + +package gorp + +import ( + "bytes" + "context" + "database/sql" + "database/sql/driver" + "errors" + "fmt" + "reflect" + "strconv" + "strings" + "time" +) + +// DbMap is the root gorp mapping object. Create one of these for each +// database schema you wish to map. Each DbMap contains a list of +// mapped tables. +// +// Example: +// +// dialect := gorp.MySQLDialect{"InnoDB", "UTF8"} +// dbmap := &gorp.DbMap{Db: db, Dialect: dialect} +// +type DbMap struct { + // Db handle to use with this map + Db *sql.DB + + // Dialect implementation to use with this map + Dialect Dialect + + TypeConverter TypeConverter + + QueryTimeout time.Duration + + tables []*TableMap + tablesDynamic map[string]*TableMap // tables that use same go-struct and different db table names + logger GorpLogger + logPrefix string +} + +func (m *DbMap) dynamicTableAdd(tableName string, tbl *TableMap) { + if m.tablesDynamic == nil { + m.tablesDynamic = make(map[string]*TableMap) + } + m.tablesDynamic[tableName] = tbl +} + +func (m *DbMap) dynamicTableFind(tableName string) (*TableMap, bool) { + if m.tablesDynamic == nil { + return nil, false + } + tbl, found := m.tablesDynamic[tableName] + return tbl, found +} + +func (m *DbMap) dynamicTableMap() map[string]*TableMap { + if m.tablesDynamic == nil { + m.tablesDynamic = make(map[string]*TableMap) + } + return m.tablesDynamic +} + +func (m *DbMap) CreateIndex() error { + + var err error + dialect := reflect.TypeOf(m.Dialect) + for _, table := range m.tables { + for _, index := range table.indexes { + err = m.createIndexImpl(dialect, table, index) + if err != nil { + break + } + } + } + + for _, table := range m.dynamicTableMap() { + for _, index := range table.indexes { + err = m.createIndexImpl(dialect, table, index) + if err != nil { + break + } + } + } + + return err +} + +func (m *DbMap) createIndexImpl(dialect reflect.Type, + table *TableMap, + index *IndexMap) error { + s := bytes.Buffer{} + s.WriteString("create") + if index.Unique { + s.WriteString(" unique") + } + s.WriteString(" index") + s.WriteString(fmt.Sprintf(" %s on %s", index.IndexName, table.TableName)) + if dname := dialect.Name(); dname == "PostgresDialect" && index.IndexType != "" { + s.WriteString(fmt.Sprintf(" %s %s", m.Dialect.CreateIndexSuffix(), index.IndexType)) + } + s.WriteString(" (") + for x, col := range index.columns { + if x > 0 { + s.WriteString(", ") + } + s.WriteString(m.Dialect.QuoteField(col)) + } + s.WriteString(")") + + if dname := dialect.Name(); dname == "MySQLDialect" && index.IndexType != "" { + s.WriteString(fmt.Sprintf(" %s %s", m.Dialect.CreateIndexSuffix(), index.IndexType)) + } + s.WriteString(";") + _, err := m.ExecNoTimeout(s.String()) + return err +} + +func (t *TableMap) DropIndex(name string) error { + + var err error + dialect := reflect.TypeOf(t.dbmap.Dialect) + for _, idx := range t.indexes { + if idx.IndexName == name { + s := bytes.Buffer{} + s.WriteString(fmt.Sprintf("DROP INDEX %s", idx.IndexName)) + + if dname := dialect.Name(); dname == "MySQLDialect" { + s.WriteString(fmt.Sprintf(" %s %s", t.dbmap.Dialect.DropIndexSuffix(), t.TableName)) + } + s.WriteString(";") + _, e := t.dbmap.ExecNoTimeout(s.String()) + if e != nil { + err = e + } + break + } + } + t.ResetSql() + return err +} + +// AddTable registers the given interface type with gorp. The table name +// will be given the name of the TypeOf(i). You must call this function, +// or AddTableWithName, for any struct type you wish to persist with +// the given DbMap. +// +// This operation is idempotent. If i's type is already mapped, the +// existing *TableMap is returned +func (m *DbMap) AddTable(i interface{}) *TableMap { + return m.AddTableWithName(i, "") +} + +// AddTableWithName has the same behavior as AddTable, but sets +// table.TableName to name. +func (m *DbMap) AddTableWithName(i interface{}, name string) *TableMap { + return m.AddTableWithNameAndSchema(i, "", name) +} + +// AddTableWithNameAndSchema has the same behavior as AddTable, but sets +// table.TableName to name. +func (m *DbMap) AddTableWithNameAndSchema(i interface{}, schema string, name string) *TableMap { + t := reflect.TypeOf(i) + if name == "" { + name = t.Name() + } + + // check if we have a table for this type already + // if so, update the name and return the existing pointer + for i := range m.tables { + table := m.tables[i] + if table.gotype == t { + table.TableName = name + return table + } + } + + tmap := &TableMap{gotype: t, TableName: name, SchemaName: schema, dbmap: m} + var primaryKey []*ColumnMap + tmap.Columns, primaryKey = m.readStructColumns(t) + m.tables = append(m.tables, tmap) + if len(primaryKey) > 0 { + tmap.keys = append(tmap.keys, primaryKey...) + } + + return tmap +} + +// AddTableDynamic registers the given interface type with gorp. +// The table name will be dynamically determined at runtime by +// using the GetTableName method on DynamicTable interface +func (m *DbMap) AddTableDynamic(inp DynamicTable, schema string) *TableMap { + + val := reflect.ValueOf(inp) + elm := val.Elem() + t := elm.Type() + name := inp.TableName() + if name == "" { + panic("Missing table name in DynamicTable instance") + } + + // Check if there is another dynamic table with the same name + if _, found := m.dynamicTableFind(name); found { + panic(fmt.Sprintf("A table with the same name %v already exists", name)) + } + + tmap := &TableMap{gotype: t, TableName: name, SchemaName: schema, dbmap: m} + var primaryKey []*ColumnMap + tmap.Columns, primaryKey = m.readStructColumns(t) + if len(primaryKey) > 0 { + tmap.keys = append(tmap.keys, primaryKey...) + } + + m.dynamicTableAdd(name, tmap) + + return tmap +} + +func (m *DbMap) readStructColumns(t reflect.Type) (cols []*ColumnMap, primaryKey []*ColumnMap) { + primaryKey = make([]*ColumnMap, 0) + n := t.NumField() + for i := 0; i < n; i++ { + f := t.Field(i) + if f.Anonymous && f.Type.Kind() == reflect.Struct { + // Recursively add nested fields in embedded structs. + subcols, subpk := m.readStructColumns(f.Type) + // Don't append nested fields that have the same field + // name as an already-mapped field. + for _, subcol := range subcols { + shouldAppend := true + for _, col := range cols { + if !subcol.Transient && subcol.fieldName == col.fieldName { + shouldAppend = false + break + } + } + if shouldAppend { + cols = append(cols, subcol) + } + } + if subpk != nil { + primaryKey = append(primaryKey, subpk...) + } + } else { + // Tag = Name { ',' Option } + // Option = OptionKey [ ':' OptionValue ] + cArguments := strings.Split(f.Tag.Get("db"), ",") + columnName := cArguments[0] + var maxSize int + var defaultValue string + var isAuto bool + var isPK bool + var isNotNull bool + for _, argString := range cArguments[1:] { + argString = strings.TrimSpace(argString) + arg := strings.SplitN(argString, ":", 2) + + // check mandatory/unexpected option values + switch arg[0] { + case "size", "default": + // options requiring value + if len(arg) == 1 { + panic(fmt.Sprintf("missing option value for option %v on field %v", arg[0], f.Name)) + } + default: + // options where value is invalid (currently all other options) + if len(arg) == 2 { + panic(fmt.Sprintf("unexpected option value for option %v on field %v", arg[0], f.Name)) + } + } + + switch arg[0] { + case "size": + maxSize, _ = strconv.Atoi(arg[1]) + case "default": + defaultValue = arg[1] + case "primarykey": + isPK = true + case "autoincrement": + isAuto = true + case "notnull": + isNotNull = true + default: + panic(fmt.Sprintf("Unrecognized tag option for field %v: %v", f.Name, arg)) + } + } + if columnName == "" { + columnName = f.Name + } + + gotype := f.Type + valueType := gotype + if valueType.Kind() == reflect.Ptr { + valueType = valueType.Elem() + } + value := reflect.New(valueType).Interface() + if m.TypeConverter != nil { + // Make a new pointer to a value of type gotype and + // pass it to the TypeConverter's FromDb method to see + // if a different type should be used for the column + // type during table creation. + scanner, useHolder := m.TypeConverter.FromDb(value) + if useHolder { + value = scanner.Holder + gotype = reflect.TypeOf(value) + } + } + if typer, ok := value.(SqlTyper); ok { + gotype = reflect.TypeOf(typer.SqlType()) + } else if valuer, ok := value.(driver.Valuer); ok { + // Only check for driver.Valuer if SqlTyper wasn't + // found. + v, err := valuer.Value() + if err == nil && v != nil { + gotype = reflect.TypeOf(v) + } + } + cm := &ColumnMap{ + ColumnName: columnName, + DefaultValue: defaultValue, + Transient: columnName == "-", + fieldName: f.Name, + gotype: gotype, + isPK: isPK, + isAutoIncr: isAuto, + isNotNull: isNotNull, + MaxSize: maxSize, + } + if isPK { + primaryKey = append(primaryKey, cm) + } + // Check for nested fields of the same field name and + // override them. + shouldAppend := true + for index, col := range cols { + if !col.Transient && col.fieldName == cm.fieldName { + cols[index] = cm + shouldAppend = false + break + } + } + if shouldAppend { + cols = append(cols, cm) + } + } + + } + return +} + +// CreateTables iterates through TableMaps registered to this DbMap and +// executes "create table" statements against the database for each. +// +// This is particularly useful in unit tests where you want to create +// and destroy the schema automatically. +func (m *DbMap) CreateTables() error { + return m.createTables(false) +} + +// CreateTablesIfNotExists is similar to CreateTables, but starts +// each statement with "create table if not exists" so that existing +// tables do not raise errors +func (m *DbMap) CreateTablesIfNotExists() error { + return m.createTables(true) +} + +func (m *DbMap) createTables(ifNotExists bool) error { + var err error + for i := range m.tables { + table := m.tables[i] + sql := table.SqlForCreate(ifNotExists) + _, err = m.ExecNoTimeout(sql) + if err != nil { + return err + } + } + + for _, tbl := range m.dynamicTableMap() { + sql := tbl.SqlForCreate(ifNotExists) + _, err = m.ExecNoTimeout(sql) + if err != nil { + return err + } + } + + return err +} + +// DropTable drops an individual table. +// Returns an error when the table does not exist. +func (m *DbMap) DropTable(table interface{}) error { + t := reflect.TypeOf(table) + + tableName := "" + if dyn, ok := table.(DynamicTable); ok { + tableName = dyn.TableName() + } + + return m.dropTable(t, tableName, false) +} + +// DropTableIfExists drops an individual table when the table exists. +func (m *DbMap) DropTableIfExists(table interface{}) error { + t := reflect.TypeOf(table) + + tableName := "" + if dyn, ok := table.(DynamicTable); ok { + tableName = dyn.TableName() + } + + return m.dropTable(t, tableName, true) +} + +// DropTables iterates through TableMaps registered to this DbMap and +// executes "drop table" statements against the database for each. +func (m *DbMap) DropTables() error { + return m.dropTables(false) +} + +// DropTablesIfExists is the same as DropTables, but uses the "if exists" clause to +// avoid errors for tables that do not exist. +func (m *DbMap) DropTablesIfExists() error { + return m.dropTables(true) +} + +// Goes through all the registered tables, dropping them one by one. +// If an error is encountered, then it is returned and the rest of +// the tables are not dropped. +func (m *DbMap) dropTables(addIfExists bool) (err error) { + for _, table := range m.tables { + err = m.dropTableImpl(table, addIfExists) + if err != nil { + return err + } + } + + for _, table := range m.dynamicTableMap() { + err = m.dropTableImpl(table, addIfExists) + if err != nil { + return err + } + } + + return err +} + +// Implementation of dropping a single table. +func (m *DbMap) dropTable(t reflect.Type, name string, addIfExists bool) error { + table := tableOrNil(m, t, name) + if table == nil { + return fmt.Errorf("table %s was not registered", table.TableName) + } + + return m.dropTableImpl(table, addIfExists) +} + +func (m *DbMap) dropTableImpl(table *TableMap, ifExists bool) (err error) { + tableDrop := "drop table" + if ifExists { + tableDrop = m.Dialect.IfTableExists(tableDrop, table.SchemaName, table.TableName) + } + _, err = m.ExecNoTimeout(fmt.Sprintf("%s %s;", tableDrop, m.Dialect.QuotedTableForQuery(table.SchemaName, table.TableName))) + return err +} + +// TruncateTables iterates through TableMaps registered to this DbMap and +// executes "truncate table" statements against the database for each, or in the case of +// sqlite, a "delete from" with no "where" clause, which uses the truncate optimization +// (http://www.sqlite.org/lang_delete.html) +func (m *DbMap) TruncateTables() error { + var err error + for i := range m.tables { + table := m.tables[i] + _, e := m.ExecNoTimeout(fmt.Sprintf("%s %s;", m.Dialect.TruncateClause(), m.Dialect.QuotedTableForQuery(table.SchemaName, table.TableName))) + if e != nil { + err = e + } + } + + for _, table := range m.dynamicTableMap() { + _, e := m.ExecNoTimeout(fmt.Sprintf("%s %s;", m.Dialect.TruncateClause(), m.Dialect.QuotedTableForQuery(table.SchemaName, table.TableName))) + if e != nil { + err = e + } + } + + return err +} + +// Insert runs a SQL INSERT statement for each element in list. List +// items must be pointers. +// +// Any interface whose TableMap has an auto-increment primary key will +// have its last insert id bound to the PK field on the struct. +// +// The hook functions PreInsert() and/or PostInsert() will be executed +// before/after the INSERT statement if the interface defines them. +// +// Panics if any interface in the list has not been registered with AddTable +func (m *DbMap) Insert(list ...interface{}) error { + return insert(m, m, list...) +} + +// Update runs a SQL UPDATE statement for each element in list. List +// items must be pointers. +// +// The hook functions PreUpdate() and/or PostUpdate() will be executed +// before/after the UPDATE statement if the interface defines them. +// +// Returns the number of rows updated. +// +// Returns an error if SetKeys has not been called on the TableMap +// Panics if any interface in the list has not been registered with AddTable +func (m *DbMap) Update(list ...interface{}) (int64, error) { + return update(m, m, nil, list...) +} + +// UpdateColumns runs a SQL UPDATE statement for each element in list. List +// items must be pointers. +// +// Only the columns accepted by filter are included in the UPDATE. +// +// The hook functions PreUpdate() and/or PostUpdate() will be executed +// before/after the UPDATE statement if the interface defines them. +// +// Returns the number of rows updated. +// +// Returns an error if SetKeys has not been called on the TableMap +// Panics if any interface in the list has not been registered with AddTable +func (m *DbMap) UpdateColumns(filter ColumnFilter, list ...interface{}) (int64, error) { + return update(m, m, filter, list...) +} + +// Delete runs a SQL DELETE statement for each element in list. List +// items must be pointers. +// +// The hook functions PreDelete() and/or PostDelete() will be executed +// before/after the DELETE statement if the interface defines them. +// +// Returns the number of rows deleted. +// +// Returns an error if SetKeys has not been called on the TableMap +// Panics if any interface in the list has not been registered with AddTable +func (m *DbMap) Delete(list ...interface{}) (int64, error) { + return delete(m, m, list...) +} + +// Get runs a SQL SELECT to fetch a single row from the table based on the +// primary key(s) +// +// i should be an empty value for the struct to load. keys should be +// the primary key value(s) for the row to load. If multiple keys +// exist on the table, the order should match the column order +// specified in SetKeys() when the table mapping was defined. +// +// The hook function PostGet() will be executed after the SELECT +// statement if the interface defines them. +// +// Returns a pointer to a struct that matches or nil if no row is found. +// +// Returns an error if SetKeys has not been called on the TableMap +// Panics if any interface in the list has not been registered with AddTable +func (m *DbMap) Get(i interface{}, keys ...interface{}) (interface{}, error) { + return get(m, m, i, keys...) +} + +// Select runs an arbitrary SQL query, binding the columns in the result +// to fields on the struct specified by i. args represent the bind +// parameters for the SQL statement. +// +// Column names on the SELECT statement should be aliased to the field names +// on the struct i. Returns an error if one or more columns in the result +// do not match. It is OK if fields on i are not part of the SQL +// statement. +// +// The hook function PostGet() will be executed after the SELECT +// statement if the interface defines them. +// +// Values are returned in one of two ways: +// 1. If i is a struct or a pointer to a struct, returns a slice of pointers to +// matching rows of type i. +// 2. If i is a pointer to a slice, the results will be appended to that slice +// and nil returned. +// +// i does NOT need to be registered with AddTable() +func (m *DbMap) Select(i interface{}, query string, args ...interface{}) ([]interface{}, error) { + return hookedselect(m, m, i, query, args...) +} + +// Exec runs an arbitrary SQL statement. args represent the bind parameters. +// This is equivalent to running: Exec() using database/sql +// Times out based on the DbMap.QueryTimeout field +func (m *DbMap) Exec(query string, args ...interface{}) (sql.Result, error) { + if m.logger != nil { + now := time.Now() + defer m.trace(now, query, args...) + } + return exec(m, query, true, args...) +} + +// ExecNoTimeout is the same as Exec except it will not time out +func (m *DbMap) ExecNoTimeout(query string, args ...interface{}) (sql.Result, error) { + if m.logger != nil { + now := time.Now() + defer m.trace(now, query, args...) + } + return exec(m, query, false, args...) +} + +// SelectInt is a convenience wrapper around the gorp.SelectInt function +func (m *DbMap) SelectInt(query string, args ...interface{}) (int64, error) { + return SelectInt(m, query, args...) +} + +// SelectNullInt is a convenience wrapper around the gorp.SelectNullInt function +func (m *DbMap) SelectNullInt(query string, args ...interface{}) (sql.NullInt64, error) { + return SelectNullInt(m, query, args...) +} + +// SelectFloat is a convenience wrapper around the gorp.SelectFloat function +func (m *DbMap) SelectFloat(query string, args ...interface{}) (float64, error) { + return SelectFloat(m, query, args...) +} + +// SelectNullFloat is a convenience wrapper around the gorp.SelectNullFloat function +func (m *DbMap) SelectNullFloat(query string, args ...interface{}) (sql.NullFloat64, error) { + return SelectNullFloat(m, query, args...) +} + +// SelectStr is a convenience wrapper around the gorp.SelectStr function +func (m *DbMap) SelectStr(query string, args ...interface{}) (string, error) { + return SelectStr(m, query, args...) +} + +// SelectNullStr is a convenience wrapper around the gorp.SelectNullStr function +func (m *DbMap) SelectNullStr(query string, args ...interface{}) (sql.NullString, error) { + return SelectNullStr(m, query, args...) +} + +// SelectOne is a convenience wrapper around the gorp.SelectOne function +func (m *DbMap) SelectOne(holder interface{}, query string, args ...interface{}) error { + return SelectOne(m, m, holder, query, args...) +} + +// Begin starts a gorp Transaction +func (m *DbMap) Begin() (*Transaction, error) { + if m.logger != nil { + now := time.Now() + defer m.trace(now, "begin;") + } + tx, err := m.Db.Begin() + if err != nil { + return nil, err + } + return &Transaction{m, tx, false}, nil +} + +// TableFor returns the *TableMap corresponding to the given Go Type +// If no table is mapped to that type an error is returned. +// If checkPK is true and the mapped table has no registered PKs, an error is returned. +func (m *DbMap) TableFor(t reflect.Type, checkPK bool) (*TableMap, error) { + table := tableOrNil(m, t, "") + if table == nil { + return nil, fmt.Errorf("no table found for type: %v", t.Name()) + } + + if checkPK && len(table.keys) < 1 { + e := fmt.Sprintf("gorp: no keys defined for table: %s", + table.TableName) + return nil, errors.New(e) + } + + return table, nil +} + +// DynamicTableFor returns the *TableMap for the dynamic table corresponding +// to the input tablename +// If no table is mapped to that tablename an error is returned. +// If checkPK is true and the mapped table has no registered PKs, an error is returned. +func (m *DbMap) DynamicTableFor(tableName string, checkPK bool) (*TableMap, error) { + table, found := m.dynamicTableFind(tableName) + if !found { + return nil, fmt.Errorf("gorp: no table found for name: %v", tableName) + } + + if checkPK && len(table.keys) < 1 { + e := fmt.Sprintf("gorp: no keys defined for table: %s", + table.TableName) + return nil, errors.New(e) + } + + return table, nil +} + +// Prepare creates a prepared statement for later queries or executions. +// Multiple queries or executions may be run concurrently from the returned statement. +// This is equivalent to running: Prepare() using database/sql +func (m *DbMap) Prepare(query string) (*sql.Stmt, error) { + if m.logger != nil { + now := time.Now() + defer m.trace(now, query, nil) + } + return m.Db.Prepare(query) +} + +func tableOrNil(m *DbMap, t reflect.Type, name string) *TableMap { + if name != "" { + // Search by table name (dynamic tables) + if table, found := m.dynamicTableFind(name); found { + return table + } + return nil + } + + for i := range m.tables { + table := m.tables[i] + if table.gotype == t { + return table + } + } + return nil +} + +func (m *DbMap) tableForPointer(ptr interface{}, checkPK bool) (*TableMap, reflect.Value, error) { + ptrv := reflect.ValueOf(ptr) + if ptrv.Kind() != reflect.Ptr { + e := fmt.Sprintf("gorp: passed non-pointer: %v (kind=%v)", ptr, + ptrv.Kind()) + return nil, reflect.Value{}, errors.New(e) + } + elem := ptrv.Elem() + ifc := elem.Interface() + var t *TableMap + var err error + tableName := "" + if dyn, isDyn := ptr.(DynamicTable); isDyn { + tableName = dyn.TableName() + t, err = m.DynamicTableFor(tableName, checkPK) + } else { + etype := reflect.TypeOf(ifc) + t, err = m.TableFor(etype, checkPK) + } + + if err != nil { + return nil, reflect.Value{}, err + } + + return t, elem, nil +} + +func (m *DbMap) QueryRow(query string, args ...interface{}) *sql.Row { + if m.logger != nil { + now := time.Now() + defer m.trace(now, query, args...) + } + + return m.Db.QueryRow(query, args...) +} + +func (m *DbMap) QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row { + if m.logger != nil { + now := time.Now() + defer m.trace(now, query, args...) + } + + return m.Db.QueryRowContext(ctx, query, args...) +} + +func (m *DbMap) Query(query string, args ...interface{}) (*sql.Rows, error) { + if m.logger != nil { + now := time.Now() + defer m.trace(now, query, args...) + } + + return m.Db.Query(query, args...) +} + +func (m *DbMap) QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error) { + if m.logger != nil { + now := time.Now() + defer m.trace(now, query, args...) + } + + return m.Db.QueryContext(ctx, query, args...) +} + +func (m *DbMap) trace(started time.Time, query string, args ...interface{}) { + if m.logger != nil { + var margs = argsString(args...) + m.logger.Printf("%s%s [%s] (%v)", m.logPrefix, query, margs, (time.Now().Sub(started))) + } +} |