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session.go
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session.go
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// Copyright (c) 2018 David Crawshaw <david@zentus.com>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
package sqlite
// #include <stdint.h>
// #include <stdlib.h>
// #include <sqlite3.h>
// #include "wrappers.h"
//
// extern int go_strm_w_tramp(uintptr_t, char*, int);
// extern int go_strm_r_tramp(uintptr_t, char*, int*);
//
// static int go_sqlite3session_changeset_strm(
// sqlite3_session *pSession,
// int (*xOutput)(void *pOut, const void *pData, int nData),
// uintptr_t pOut
// ) {
// return sqlite3session_changeset_strm(pSession, xOutput, (void *)pOut);
// }
//
// static int go_sqlite3session_patchset_strm(
// sqlite3_session *pSession,
// int (*xOutput)(void *pOut, const void *pData, int nData),
// uintptr_t pOut
// ) {
// return sqlite3session_patchset_strm(pSession, xOutput, (void *)pOut);
// }
//
// static int go_sqlite3changeset_invert_strm(
// int (*xInput)(void *pIn, void *pData, int *pnData),
// uintptr_t pIn,
// int (*xOutput)(void *pOut, const void *pData, int nData),
// uintptr_t pOut
// ) {
// return sqlite3changeset_invert_strm(xInput, (void *)pIn, xOutput, (void *)pOut);
// }
//
// static int go_sqlite3changeset_apply_v2_strm(
// sqlite3 *db, /* Apply change to "main" db of this handle */
// int (*xInput)(void *pIn, void *pData, int *pnData), /* Input function */
// uintptr_t pIn, /* First arg for xInput */
// int(*xFilter)(
// void *pCtx, /* Copy of sixth arg to _apply() */
// const char *zTab /* Table name */
// ),
// int(*xConflict)(
// void *pCtx, /* Copy of sixth arg to _apply() */
// int eConflict, /* DATA, MISSING, CONFLICT, CONSTRAINT */
// sqlite3_changeset_iter *p /* Handle describing change and conflict */
// ),
// uintptr_t pCtx, /* First argument passed to xConflict */
// void **ppRebase, int *pnRebase,
// int flags
// ) {
// return sqlite3changeset_apply_v2_strm(db,
// xInput,
// (void *)pIn,
// xFilter,
// xConflict,
// (void *)pCtx,
// ppRebase,
// pnRebase,
// flags
// );
// }
//
// static int go_sqlite3changeset_concat_strm(
// int (*xInputA)(void *pIn, void *pData, int *pnData),
// uintptr_t pInA,
// int (*xInputB)(void *pIn, void *pData, int *pnData),
// uintptr_t pInB,
// int (*xOutput)(void *pOut, const void *pData, int nData),
// uintptr_t pOut
// ) {
// return sqlite3changeset_concat_strm(
// xInputA, (void *)pInA,
// xInputB, (void *)pInB,
// xOutput, (void *)pOut
// );
// }
//
// static int go_sqlite3changeset_start_strm(
// sqlite3_changeset_iter **pp,
// int (*xInput)(void *pIn, void *pData, int *pnData),
// uintptr_t pIn
// ) {
// return sqlite3changeset_start_strm(pp, xInput, (void *)pIn);
// }
//
// static int go_sqlite3changegroup_add_strm(sqlite3_changegroup* g,
// int (*xInput)(void *pIn, void *pData, int *pnData),
// uintptr_t pIn
// ) {
// return sqlite3changegroup_add_strm(g, xInput, (void *)pIn);
// }
//
// static int go_sqlite3changegroup_output_strm(sqlite3_changegroup* g,
// int (*xOutput)(void *pOut, const void *pData, int nData),
// uintptr_t pOut
// ) {
// return sqlite3changegroup_output_strm(g, xOutput, (void *)pOut);
// }
import "C"
import (
"io"
"runtime"
"sync"
"unsafe"
)
// A Session tracks database changes made by a Conn.
//
// It is used to build changesets.
//
// Equivalent to the sqlite3_session* C object.
type Session struct {
ptr *C.sqlite3_session
}
// CreateSession creates a new session object.
// If db is "", then a default of "main" is used.
//
// https://www.sqlite.org/session/sqlite3session_create.html
func (conn *Conn) CreateSession(db string) (*Session, error) {
var cdb *C.char
if db == "" || db == "main" {
cdb = cmain
} else {
cdb = C.CString(db)
defer C.free(unsafe.Pointer(cdb))
}
s := &Session{}
res := C.sqlite3session_create(conn.conn, cdb, &s.ptr)
if err := conn.reserr("Conn.CreateSession", db, res); err != nil {
return nil, err
}
runtime.SetFinalizer(s, func(s *Session) {
if s.ptr != nil {
panic("open *sqlite.Session garbage collected, call Delete method")
}
})
return s, nil
}
// Delete deletes a Session object.
//
// https://www.sqlite.org/session/sqlite3session_delete.html
func (s *Session) Delete() {
C.sqlite3session_delete(s.ptr)
s.ptr = nil
}
// Enable enables recording of changes by a Session.
// New Sessions start enabled.
//
// https://www.sqlite.org/session/sqlite3session_enable.html
func (s *Session) Enable() { C.sqlite3session_enable(s.ptr, 1) }
// Disable disables recording of changes by a Session.
//
// https://www.sqlite.org/session/sqlite3session_enable.html
func (s *Session) Disable() { C.sqlite3session_enable(s.ptr, 0) }
// Attach attaches a table to the session object.
// Changes made to the table will be tracked by the session.
//
// An empty tableName attaches all the tables in the database.
func (s *Session) Attach(tableName string) error {
var ctable *C.char
if tableName != "" {
ctable = C.CString(tableName)
defer C.free(unsafe.Pointer(ctable))
}
res := C.sqlite3session_attach(s.ptr, ctable)
return reserr("Session.Attach", tableName, "", res)
}
// Diff appends the difference between two tables (srcDB and the session DB) to the session.
// The two tables must have the same name and schema.
func (s *Session) Diff(srcDB, tableName string) error {
var errmsg *C.char
csrcDB := C.CString(srcDB)
ctable := C.CString(tableName)
defer func() {
C.free(unsafe.Pointer(csrcDB))
C.free(unsafe.Pointer(ctable))
if errmsg != nil {
C.free(unsafe.Pointer(errmsg))
}
}()
res := C.sqlite3session_diff(s.ptr, csrcDB, ctable, &errmsg)
if res != 0 {
return reserr("Session.Diff", srcDB+"."+tableName, C.GoString(errmsg), res)
}
return nil
}
// Changeset generates a changeset from a session.
//
// https://www.sqlite.org/session/sqlite3session_changeset.html
func (s *Session) Changeset(w io.Writer) error {
x := newStrm(w, nil)
defer x.free()
res := C.go_sqlite3session_changeset_strm(s.ptr, (*[0]byte)(C.c_strm_w_tramp), x.cptr())
return reserr("Session.Changeset", "", "", res)
}
// Patchset generates a patchset from a session.
//
// https://www.sqlite.org/session/sqlite3session_patchset.html
func (s *Session) Patchset(w io.Writer) error {
x := newStrm(w, nil)
defer x.free()
res := C.go_sqlite3session_patchset_strm(s.ptr, (*[0]byte)(C.c_strm_w_tramp), x.cptr())
return reserr("Session.Patchset", "", "", res)
}
// ChangesetApply applies a changeset to the database.
//
// If a changeset will not apply cleanly then conflictFn can be used to resolve
// the conflict. See the SQLite documentation for full details.
//
// https://www.sqlite.org/session/sqlite3changeset_apply.html
func (conn *Conn) ChangesetApply(r io.Reader,
filterFn func(tableName string) bool,
conflictFn func(ConflictType, ChangesetIter) ConflictAction) error {
return conn.changesetApply(r, filterFn, conflictFn, false)
}
// ChangesetApplyInverse applies the inverse of a changeset to the database.
//
// If a changeset will not apply cleanly then conflictFn can be used to resolve
// the conflict. See the SQLite documentation for full details.
//
// This is equivalent to inverting a changeset using ChangesetInvert before
// applying it. It is an error to use a patchset.
//
// https://www.sqlite.org/session/sqlite3changeset_apply.html
//
// https://www.sqlite.org/session/c_changesetapply_invert.html
//
// https://www.sqlite.org/session/sqlite3changeset_invert.html
func (conn *Conn) ChangesetApplyInverse(r io.Reader,
filterFn func(tableName string) bool,
conflictFn func(ConflictType, ChangesetIter) ConflictAction) error {
return conn.changesetApply(r, filterFn, conflictFn, true)
}
func (conn *Conn) changesetApply(r io.Reader,
filterFn func(tableName string) bool,
conflictFn func(ConflictType, ChangesetIter) ConflictAction,
invert bool) error {
xIn := newStrm(nil, r)
x := &xapply{
conn: conn,
filterFn: filterFn,
conflictFn: conflictFn,
}
xapplys.mu.Lock()
xapplys.next++
x.id = xapplys.next
xapplys.m[x.id] = x
xapplys.mu.Unlock()
var filterTramp, conflictTramp *[0]byte
if x.filterFn != nil {
filterTramp = (*[0]byte)(C.c_xapply_filter_tramp)
}
if x.conflictFn != nil {
conflictTramp = (*[0]byte)(C.c_xapply_conflict_tramp)
}
var flags C.int
if invert {
flags = C.SQLITE_CHANGESETAPPLY_INVERT
}
pCtx := (C.uintptr_t)(x.id)
res := C.go_sqlite3changeset_apply_v2_strm(conn.conn,
(*[0]byte)(C.c_strm_r_tramp),
xIn.cptr(),
filterTramp, conflictTramp,
pCtx,
nil, nil,
flags)
xapplys.mu.Lock()
delete(xapplys.m, x.id)
xapplys.mu.Unlock()
xIn.free()
return conn.reserr("Conn.ChangesetApply", "", res)
}
// ChangesetInvert inverts a changeset.
//
// https://www.sqlite.org/session/sqlite3changeset_invert.html
func ChangesetInvert(w io.Writer, r io.Reader) error {
xIn := newStrm(nil, r)
xOut := newStrm(w, nil)
res := C.go_sqlite3changeset_invert_strm(
(*[0]byte)(C.c_strm_r_tramp), xIn.cptr(),
(*[0]byte)(C.c_strm_w_tramp), xOut.cptr(),
)
xIn.free()
xOut.free()
return reserr("ChangesetInvert", "", "", res)
}
// ChangesetConcat concatenates two changesets.
//
// https://www.sqlite.org/session/sqlite3changeset_concat.html
func ChangesetConcat(w io.Writer, r1, r2 io.Reader) error {
xInA := newStrm(nil, r1)
xInB := newStrm(nil, r2)
xOut := newStrm(w, nil)
res := C.go_sqlite3changeset_concat_strm(
(*[0]byte)(C.c_strm_r_tramp), xInA.cptr(),
(*[0]byte)(C.c_strm_r_tramp), xInB.cptr(),
(*[0]byte)(C.c_strm_w_tramp), xOut.cptr(),
)
xInA.free()
xInB.free()
xOut.free()
return reserr("ChangesetConcat", "", "", res)
}
// ChangesetIter is an iterator over a changeset.
//
// An iterator is used much like a Stmt over result rows.
// It is also used in the conflictFn provided to ChangesetApply.
// To process the changes in a changeset:
//
// iter, err := ChangesetIterStart(r)
// if err != nil {
// // ... handle err
// }
// for {
// hasRow, err := iter.Next()
// if err != nil {
// // ... handle err
// }
// if !hasRow {
// break
// }
// // Use the Op, New, Old method to inspect the change.
// }
// if err := iter.Finalize(); err != nil {
// // ... handle err
// }
type ChangesetIter struct {
ptr *C.sqlite3_changeset_iter
xIn *strm
}
// ChangesetIterStart creates an iterator over a changeset.
//
// https://www.sqlite.org/session/sqlite3changeset_start.html
func ChangesetIterStart(r io.Reader) (ChangesetIter, error) {
iter := ChangesetIter{}
iter.xIn = newStrm(nil, r)
res := C.go_sqlite3changeset_start_strm(
&iter.ptr,
(*[0]byte)(C.c_strm_r_tramp),
iter.xIn.cptr())
if err := reserr("ChangesetIterStart", "", "", res); err != nil {
return ChangesetIter{}, err
}
return iter, nil
}
// Finalize deletes a changeset iterator.
// Do not use in iterators passed to a ChangesetApply conflictFn.
//
// https://www.sqlite.org/session/sqlite3changeset_finalize.html
func (iter ChangesetIter) Finalize() error {
res := C.sqlite3changeset_finalize(iter.ptr)
iter.ptr = nil
if iter.xIn != nil {
iter.xIn.free()
iter.xIn = nil
}
return reserr("ChangesetIter.Finalize", "", "", res)
}
// Old obtains old row values from an iterator.
//
// https://www.sqlite.org/session/sqlite3changeset_old.html
func (iter ChangesetIter) Old(col int) (v Value, err error) {
res := C.sqlite3changeset_old(iter.ptr, C.int(col), &v.ptr)
if err := reserr("ChangesetIter.Old", "", "", res); err != nil {
return Value{}, err
}
return v, nil
}
// New obtains new row values from an iterator.
//
// https://www.sqlite.org/session/sqlite3changeset_new.html
func (iter ChangesetIter) New(col int) (v Value, err error) {
res := C.sqlite3changeset_new(iter.ptr, C.int(col), &v.ptr)
if err := reserr("ChangesetIter.New", "", "", res); err != nil {
return Value{}, err
}
return v, nil
}
// Conflict obtains conflicting row values from an iterator.
// Only use this in an iterator passed to a ChangesetApply conflictFn.
//
// https://www.sqlite.org/session/sqlite3changeset_conflict.html
func (iter ChangesetIter) Conflict(col int) (v Value, err error) {
res := C.sqlite3changeset_conflict(iter.ptr, C.int(col), &v.ptr)
if err := reserr("ChangesetIter.Conflict", "", "", res); err != nil {
return Value{}, err
}
return v, nil
}
// Next moves a changeset iterator forward.
// Do not use in iterators passed to a ChangesetApply conflictFn.
//
// https://www.sqlite.org/session/sqlite3changeset_next.html
func (iter ChangesetIter) Next() (rowReturned bool, err error) {
switch res := C.sqlite3changeset_next(iter.ptr); res {
case C.SQLITE_ROW:
return true, nil
case C.SQLITE_DONE:
return false, nil
default:
return false, reserr("ChangesetIter.Next", "", "", res)
}
}
// Op reports details about the current operation in the iterator.
//
// https://www.sqlite.org/session/sqlite3changeset_op.html
func (iter ChangesetIter) Op() (table string, numCols int, opType OpType, indirect bool, err error) {
var pzTab *C.char
var pnCol, pOp, pbIndirect C.int
res := C.sqlite3changeset_op(iter.ptr, &pzTab, &pnCol, &pOp, &pbIndirect)
if err := reserr("ChangesetIter.Op", "", "", res); err != nil {
return "", 0, 0, false, err
}
table = C.GoString(pzTab)
numCols = int(pnCol)
opType = OpType(pOp)
if pbIndirect != 0 {
indirect = true
}
return table, numCols, opType, indirect, nil
}
// FKConflicts reports the number of foreign key constraint violations.
//
// https://www.sqlite.org/session/sqlite3changeset_fk_conflicts.html
func (iter ChangesetIter) FKConflicts() (int, error) {
var pnOut C.int
res := C.sqlite3changeset_fk_conflicts(iter.ptr, &pnOut)
if err := reserr("ChangesetIter.FKConflicts", "", "", res); err != nil {
return 0, err
}
return int(pnOut), nil
}
// PK reports the columns that make up the primary key.
//
// https://www.sqlite.org/session/sqlite3changeset_pk.html
func (iter ChangesetIter) PK() ([]bool, error) {
var pabPK *C.uchar
var pnCol C.int
res := C.sqlite3changeset_pk(iter.ptr, &pabPK, &pnCol)
if err := reserr("ChangesetIter.PK", "", "", res); err != nil {
return nil, err
}
vals := (*[127]byte)(unsafe.Pointer(pabPK))[:pnCol:pnCol]
cols := make([]bool, pnCol)
for i, val := range vals {
if val != 0 {
cols[i] = true
}
}
return cols, nil
}
// OpType is an enumeration of SQLite statements. Used for authorization and
// changeset details.
type OpType int
// Operation types
const (
SQLITE_CREATE_INDEX OpType = C.SQLITE_CREATE_INDEX
SQLITE_CREATE_TABLE OpType = C.SQLITE_CREATE_TABLE
SQLITE_CREATE_TEMP_INDEX OpType = C.SQLITE_CREATE_TEMP_INDEX
SQLITE_CREATE_TEMP_TABLE OpType = C.SQLITE_CREATE_TEMP_TABLE
SQLITE_CREATE_TEMP_TRIGGER OpType = C.SQLITE_CREATE_TEMP_TRIGGER
SQLITE_CREATE_TEMP_VIEW OpType = C.SQLITE_CREATE_TEMP_VIEW
SQLITE_CREATE_TRIGGER OpType = C.SQLITE_CREATE_TRIGGER
SQLITE_CREATE_VIEW OpType = C.SQLITE_CREATE_VIEW
SQLITE_DELETE OpType = C.SQLITE_DELETE
SQLITE_DROP_INDEX OpType = C.SQLITE_DROP_INDEX
SQLITE_DROP_TABLE OpType = C.SQLITE_DROP_TABLE
SQLITE_DROP_TEMP_INDEX OpType = C.SQLITE_DROP_TEMP_INDEX
SQLITE_DROP_TEMP_TABLE OpType = C.SQLITE_DROP_TEMP_TABLE
SQLITE_DROP_TEMP_TRIGGER OpType = C.SQLITE_DROP_TEMP_TRIGGER
SQLITE_DROP_TEMP_VIEW OpType = C.SQLITE_DROP_TEMP_VIEW
SQLITE_DROP_TRIGGER OpType = C.SQLITE_DROP_TRIGGER
SQLITE_DROP_VIEW OpType = C.SQLITE_DROP_VIEW
SQLITE_INSERT OpType = C.SQLITE_INSERT
SQLITE_PRAGMA OpType = C.SQLITE_PRAGMA
SQLITE_READ OpType = C.SQLITE_READ
SQLITE_SELECT OpType = C.SQLITE_SELECT
SQLITE_TRANSACTION OpType = C.SQLITE_TRANSACTION
SQLITE_UPDATE OpType = C.SQLITE_UPDATE
SQLITE_ATTACH OpType = C.SQLITE_ATTACH
SQLITE_DETACH OpType = C.SQLITE_DETACH
SQLITE_ALTER_TABLE OpType = C.SQLITE_ALTER_TABLE
SQLITE_REINDEX OpType = C.SQLITE_REINDEX
SQLITE_ANALYZE OpType = C.SQLITE_ANALYZE
SQLITE_CREATE_VTABLE OpType = C.SQLITE_CREATE_VTABLE
SQLITE_DROP_VTABLE OpType = C.SQLITE_DROP_VTABLE
SQLITE_FUNCTION OpType = C.SQLITE_FUNCTION
SQLITE_SAVEPOINT OpType = C.SQLITE_SAVEPOINT
SQLITE_COPY OpType = C.SQLITE_COPY
SQLITE_RECURSIVE OpType = C.SQLITE_RECURSIVE
)
func (opType OpType) String() string {
switch opType {
default:
var buf [20]byte
return "SQLITE_UNKNOWN_OP_TYPE(" + string(itoa(buf[:], int64(opType))) + ")"
case SQLITE_CREATE_INDEX:
return "SQLITE_CREATE_INDEX"
case SQLITE_CREATE_TABLE:
return "SQLITE_CREATE_TABLE"
case SQLITE_CREATE_TEMP_INDEX:
return "SQLITE_CREATE_TEMP_INDEX"
case SQLITE_CREATE_TEMP_TABLE:
return "SQLITE_CREATE_TEMP_TABLE"
case SQLITE_CREATE_TEMP_TRIGGER:
return "SQLITE_CREATE_TEMP_TRIGGER"
case SQLITE_CREATE_TEMP_VIEW:
return "SQLITE_CREATE_TEMP_VIEW"
case SQLITE_CREATE_TRIGGER:
return "SQLITE_CREATE_TRIGGER"
case SQLITE_CREATE_VIEW:
return "SQLITE_CREATE_VIEW"
case SQLITE_DELETE:
return "SQLITE_DELETE"
case SQLITE_DROP_INDEX:
return "SQLITE_DROP_INDEX"
case SQLITE_DROP_TABLE:
return "SQLITE_DROP_TABLE"
case SQLITE_DROP_TEMP_INDEX:
return "SQLITE_DROP_TEMP_INDEX"
case SQLITE_DROP_TEMP_TABLE:
return "SQLITE_DROP_TEMP_TABLE"
case SQLITE_DROP_TEMP_TRIGGER:
return "SQLITE_DROP_TEMP_TRIGGER"
case SQLITE_DROP_TEMP_VIEW:
return "SQLITE_DROP_TEMP_VIEW"
case SQLITE_DROP_TRIGGER:
return "SQLITE_DROP_TRIGGER"
case SQLITE_DROP_VIEW:
return "SQLITE_DROP_VIEW"
case SQLITE_INSERT:
return "SQLITE_INSERT"
case SQLITE_PRAGMA:
return "SQLITE_PRAGMA"
case SQLITE_READ:
return "SQLITE_READ"
case SQLITE_SELECT:
return "SQLITE_SELECT"
case SQLITE_TRANSACTION:
return "SQLITE_TRANSACTION"
case SQLITE_UPDATE:
return "SQLITE_UPDATE"
case SQLITE_ATTACH:
return "SQLITE_ATTACH"
case SQLITE_DETACH:
return "SQLITE_DETACH"
case SQLITE_ALTER_TABLE:
return "SQLITE_ALTER_TABLE"
case SQLITE_REINDEX:
return "SQLITE_REINDEX"
case SQLITE_ANALYZE:
return "SQLITE_ANALYZE"
case SQLITE_CREATE_VTABLE:
return "SQLITE_CREATE_VTABLE"
case SQLITE_DROP_VTABLE:
return "SQLITE_DROP_VTABLE"
case SQLITE_FUNCTION:
return "SQLITE_FUNCTION"
case SQLITE_SAVEPOINT:
return "SQLITE_SAVEPOINT"
case SQLITE_COPY:
return "SQLITE_COPY"
case SQLITE_RECURSIVE:
return "SQLITE_RECURSIVE"
}
}
type ConflictType int
const (
SQLITE_CHANGESET_DATA = ConflictType(C.SQLITE_CHANGESET_DATA)
SQLITE_CHANGESET_NOTFOUND = ConflictType(C.SQLITE_CHANGESET_NOTFOUND)
SQLITE_CHANGESET_CONFLICT = ConflictType(C.SQLITE_CHANGESET_CONFLICT)
SQLITE_CHANGESET_CONSTRAINT = ConflictType(C.SQLITE_CHANGESET_CONSTRAINT)
SQLITE_CHANGESET_FOREIGN_KEY = ConflictType(C.SQLITE_CHANGESET_FOREIGN_KEY)
)
func (code ConflictType) String() string {
switch code {
default:
var buf [20]byte
return "SQLITE_UNKNOWN_CONFLICT_TYPE(" + string(itoa(buf[:], int64(code))) + ")"
case SQLITE_CHANGESET_DATA:
return "SQLITE_CHANGESET_DATA"
case SQLITE_CHANGESET_NOTFOUND:
return "SQLITE_CHANGESET_NOTFOUND"
case SQLITE_CHANGESET_CONFLICT:
return "SQLITE_CHANGESET_CONFLICT"
case SQLITE_CHANGESET_CONSTRAINT:
return "SQLITE_CHANGESET_CONSTRAINT"
case SQLITE_CHANGESET_FOREIGN_KEY:
return "SQLITE_CHANGESET_FOREIGN_KEY"
}
}
type ConflictAction int
const (
SQLITE_CHANGESET_OMIT = ConflictAction(C.SQLITE_CHANGESET_OMIT)
SQLITE_CHANGESET_ABORT = ConflictAction(C.SQLITE_CHANGESET_ABORT)
SQLITE_CHANGESET_REPLACE = ConflictAction(C.SQLITE_CHANGESET_REPLACE)
)
func (code ConflictAction) String() string {
switch code {
default:
var buf [20]byte
return "SQLITE_UNKNOWN_CONFLICT_ACTION(" + string(itoa(buf[:], int64(code))) + ")"
case SQLITE_CHANGESET_OMIT:
return "SQLITE_CHANGESET_OMIT"
case SQLITE_CHANGESET_ABORT:
return "SQLITE_CHANGESET_ABORT"
case SQLITE_CHANGESET_REPLACE:
return "SQLITE_CHANGESET_REPLACE"
}
}
type Changegroup struct {
ptr *C.sqlite3_changegroup
}
// https://www.sqlite.org/session/sqlite3changegroup_new.html
func NewChangegroup() (*Changegroup, error) {
c := &Changegroup{}
res := C.sqlite3changegroup_new(&c.ptr)
if err := reserr("NewChangegroup", "", "", res); err != nil {
return nil, err
}
return c, nil
}
// https://www.sqlite.org/session/sqlite3changegroup_add.html
func (cg Changegroup) Add(r io.Reader) error {
xIn := newStrm(nil, r)
res := C.go_sqlite3changegroup_add_strm(
cg.ptr,
(*[0]byte)(C.c_strm_r_tramp),
xIn.cptr())
xIn.free()
return reserr("Changegroup.Add", "", "", res)
}
// Delete a Changegroup.
//
// https://www.sqlite.org/session/sqlite3changegroup_delete.html
func (cg Changegroup) Delete() {
C.sqlite3changegroup_delete(cg.ptr)
}
// https://www.sqlite.org/session/sqlite3changegroup_output.html
func (cg Changegroup) Output(w io.Writer) (n int, err error) {
xOut := newStrm(w, nil)
res := C.go_sqlite3changegroup_output_strm(
cg.ptr,
(*[0]byte)(C.c_strm_w_tramp),
xOut.cptr())
n = xOut.n
xOut.free()
return n, reserr("Changegroup.Output", "", "", res)
}
type strm struct {
id int
w io.Writer // one of w or r is set
r io.Reader
n int // number of bytes read or written
}
var strms = struct {
mu sync.RWMutex
m map[int]*strm
next int
}{
m: make(map[int]*strm),
}
func newStrm(w io.Writer, r io.Reader) *strm {
x := &strm{w: w, r: r}
strms.mu.Lock()
strms.next++
x.id = strms.next
strms.m[x.id] = x
strms.mu.Unlock()
return x
}
func (x strm) free() {
strms.mu.Lock()
delete(strms.m, x.id)
strms.mu.Unlock()
}
func (x *strm) cptr() C.uintptr_t { return (C.uintptr_t)(x.id) }
func getStrm(cptr uintptr) *strm {
strms.mu.RLock()
x := strms.m[int(cptr)]
strms.mu.RUnlock()
return x
}
//export go_strm_w_tramp
func go_strm_w_tramp(pOut uintptr, pData *C.char, n C.int) C.int {
//println("go_strm_w_tramp start")
x := getStrm(pOut)
b := (*[1 << 30]byte)(unsafe.Pointer(pData))[:n:n]
for len(b) > 0 {
nw, err := x.w.Write(b)
x.n += nw
b = b[nw:]
if err != nil {
if code := ErrCode(err); code != SQLITE_ERROR {
return C.int(code)
}
return C.SQLITE_IOERR
}
}
//println("go_strm_w_tramp OK, nw=", nw)
return C.SQLITE_OK
}
//export go_strm_r_tramp
func go_strm_r_tramp(pIn uintptr, pData *C.char, pnData *C.int) C.int {
x := getStrm(pIn)
b := (*[1 << 30]byte)(unsafe.Pointer(pData))[:*pnData:*pnData]
var n int
var err error
for n == 0 && err == nil {
// Technically an io.Reader is allowed to return (0, nil)
// and it is not treated as the end of the stream.
//
// So we spin here until the io.Reader is gracious enough
// to get off its butt and actually do something.
n, err = x.r.Read(b)
}
x.n += n
//println("*pnData:", *pnData, "n:", n)
*pnData = C.int(n)
if err != nil && err != io.EOF {
if code := ErrCode(err); code != SQLITE_ERROR {
return C.int(code)
}
return C.SQLITE_IOERR
}
return C.SQLITE_OK
}
type xapply struct {
id int
conn *Conn
filterFn func(string) bool
conflictFn func(ConflictType, ChangesetIter) ConflictAction
}
var xapplys = struct {
mu sync.RWMutex
m map[int]*xapply
next int
}{
m: make(map[int]*xapply),
}
//export go_xapply_filter_tramp
func go_xapply_filter_tramp(pCtx uintptr, zTab *C.char) C.int {
xapplys.mu.Lock()
x, ok := xapplys.m[int(pCtx)]
xapplys.mu.Unlock()
if !ok {
panic("not ok")
}
if x == nil {
panic("x == nil")
}
tableName := C.GoString(zTab)
if x.filterFn(tableName) {
return 1
}
return 0
}
//export go_xapply_conflict_tramp
func go_xapply_conflict_tramp(pCtx uintptr, eConflict C.int, p *C.sqlite3_changeset_iter) C.int {
xapplys.mu.Lock()
x := xapplys.m[int(pCtx)]
xapplys.mu.Unlock()
action := x.conflictFn(ConflictType(eConflict), ChangesetIter{ptr: p})
return C.int(action)
}