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Copy pathpatch.cpp
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524 lines (413 loc) · 10.4 KB
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Copy pathpatch.cpp
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524 lines (413 loc) · 10.4 KB
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#include "diff.h"
#include "sqliteint.h"
#include <cassert>
#include <cstdlib>
#include <cstring>
#include <numeric>
#include <string>
#include <iostream>
#include <fstream>
#include <vector>
#include <chrono>
#include "patch.h"
#define CHANGESET_CORRUPT 1
#define CHANGESET_INSTRUCTION_CORRUPT 3
#define CHANGESET_CALLBACK_ERROR 4
/**
FORMAT of binary changeset (pseudo-grammar):
->:
<TableInstructions>[1+]
TableInstructions:
'T'
varint => nCols
byte[nCols] (PK flag)
<string> name of table
<Instruction>[1+]
string:
varInt length
… data
Instruction:
<InstrInsert> | <InstrDelete> | <InstrUpdate>
InstrInsert:
SQLITE_INSERT
0x0
<Value>[nCols]
InstrDelete:
SQLITE_DELETE
0x0
<Value>[nCols]
InstrUpdate:
SQLITE_DELETE
0x0
<ZeroOrValue>[nCols] # Old Values (zero if not changed)
<ZeroOrValue>[nCols] # New Values (zero if not changed)
ZeroOrValue:
0x0 | <Value>
Value:
byte iDType data type, (if NULL that's it)
…data
*/
size_t readValue(const char* buf, sqlite_value* val)
{
u8 type = buf[0];
val->type = type;
buf++;
void* data = (void*)(buf);
size_t read = 1;
switch(type)
{
case SQLITE_INTEGER: {
val->data1.iVal = sessionGetI64((u8*)data);
read += 8;
break;
}
case SQLITE_FLOAT: {
int64_t iVal = sessionGetI64((u8*)data);
val->data1.dVal = *(double*)(&iVal);
read += 8;
break;
}
case SQLITE_TEXT: {
u32 textLen;
u8 varIntLen = getVarint32((u8*)data, textLen);
val->data1.iVal = textLen;
val->data2 = (char*)data + varIntLen;
read += textLen + varIntLen;
break;
}
case SQLITE_BLOB: {
u32 blobLen;
u8 varIntLen = getVarint32((u8*)data, blobLen);
val->data1.iVal = blobLen;
val->data2 = (char*)data + varIntLen;
read += blobLen + varIntLen;
break;
}
case SQLITE_NULL:
break;
case 0:
val->type = 0;
break;
default:
val->type = -1;
return 0;
}
return read;
}
int bindValue(sqlite3_stmt* stmt, int col, const sqlite_value* val) {
switch(val->type) {
case SQLITE_INTEGER:
return sqlite3_bind_int64(stmt, col, val->data1.iVal);
case SQLITE_FLOAT:
return sqlite3_bind_double(stmt, col, val->data1.dVal);
case SQLITE_TEXT:
return sqlite3_bind_text(stmt, col, val->data2, val->data1.iVal, nullptr);
case SQLITE_BLOB:
return sqlite3_bind_blob64(stmt, col, val->data2, val->data1.iVal, nullptr);
case SQLITE_NULL:
return sqlite3_bind_null(stmt, col);
default:
return SQLITE_INTERNAL;
}
}
int bindValues(sqlite3_stmt* stmt, sqlite_value* values, uint8_t nCol) {
for (int i=0; i < nCol; i++) {
int rc = bindValue(stmt, i+1, &values[i]);
if (rc != SQLITE_OK) {
return rc;
}
}
return SQLITE_OK;
}
int applyInsert(sqlite3* db, const Instruction* instr)
{
int rc;
int nCol = instr->table->nCol;
const char* tableName = instr->table->tableName;
std::string sql = std::string() + "INSERT INTO " + tableName + " VALUES (";
for (int i=0; i < nCol; i++) {
sql += "?";
if (i < nCol - 1) {
sql += ", ";
}
}
sql += ");";
sqlite3_stmt* stmt;
rc = sqlite3_prepare_v2(db, sql.data(), sql.size(), &stmt, nullptr);
if (rc != SQLITE_OK) {
return rc;
}
rc = bindValues(stmt, instr->values, nCol);
if (rc != SQLITE_OK) {
return rc;
}
rc = sqlite3_step(stmt);
sqlite3_finalize(stmt);
if (rc != SQLITE_DONE) {
std::cerr << "Error applying insert: " << sqlite3_errmsg(db) << std::endl;
return rc;
}
return SQLITE_OK;
}
std::vector<std::string> getColumnNames(sqlite3* db, const char* tableName)
{
std::vector<std::string> result; int rc;
sqlite3_stmt* stmt;
std::string sql = std::string() + "pragma table_info(" + tableName +");";
rc = sqlite3_prepare_v2(db, sql.data(), -1, &stmt, nullptr);
if (rc!=SQLITE_OK) {
return result;
}
while(rc == SQLITE_OK && sqlite3_step(stmt) == SQLITE_ROW)
{
result.push_back((const char*)sqlite3_column_text(stmt, 1));
}
result.shrink_to_fit();
sqlite3_finalize(stmt);
return result;
}
int applyDelete(sqlite3* db, const Instruction* instr)
{
int rc;
auto columnNames = getColumnNames(db, instr->table->tableName);
std::string sql = std::string() + "DELETE FROM " + instr->table->tableName + " WHERE ";
uint8_t nCol = instr->table->nCol;
std::vector<std::string> wheres;
std::vector<sqlite_value> whereValues;
for (int i=0; i < nCol; i++)
{
if (instr->values[i].type) {
wheres.push_back(columnNames.at(i) + " = ?");
whereValues.push_back(instr->values[i]);
}
}
sql += std::accumulate(wheres.cbegin()+1, wheres.cend(), wheres.at(0), [&columnNames](const std::string&a, const std::string& b) {
return a + " AND " + b;
});
sqlite3_stmt* stmt;
rc = sqlite3_prepare_v2(db, sql.data(), sql.size(), &stmt, nullptr);
if (rc != SQLITE_OK) {
std::cerr << "Failed preparing DELETE statement " << sql << std::endl;
return rc;
}
rc = bindValues(stmt, whereValues.data(), whereValues.size());
if (rc != SQLITE_OK) {
std::cerr << "Failed binding to DELETE statement " << sql << std::endl;
return rc;
}
rc = sqlite3_step(stmt);
sqlite3_finalize(stmt);
if (rc != SQLITE_DONE) {
return rc;
}
return SQLITE_OK;
}
int applyUpdate(sqlite3* db, const Instruction* instr)
{
int nCol = instr->table->nCol;
sqlite_value* valsBefore = instr->values;
sqlite_value* valsAfter = instr->values + nCol;
std::vector<std::string> columnNames = getColumnNames(db, instr->table->tableName);
std::string sql;
sql = sql + "UPDATE " + instr->table->tableName + " SET";
// sets
for (int n=0, i=0; i < nCol; i++) {
const auto& name = columnNames.at(i);
const auto val = valsAfter[i];
if (val.type) {
if (n > 0) {
sql += ", ";
}
sql = sql + " " + name + " = " + "?";
n++;
}
}
//wheres
sql += " WHERE ";
for (int n=0, i=0; i < nCol; i++) {
const auto& name = columnNames.at(i);
const auto val = valsBefore[i];
if (val.type) {
if (n > 0) {
sql += " AND";
}
sql = sql + " " + name + " = " + "?";
n++;
}
}
sqlite3_stmt* stmt; int rc;
rc = sqlite3_prepare_v2(db, sql.data(), sql.size(), &stmt, nullptr);
if (rc != SQLITE_OK) {
std::cerr << "applyUpdate: Failed preparing sql " << sql << std::endl;
return 1;
}
int n = 1;
for (int i=0; i < nCol; i++) {
sqlite_value* val = &valsAfter[i];
if (val->type) {
if (bindValue(stmt, n, val)) {
return 1;
}
n++;
}
}
for (int i=0; i < nCol; i++) {
sqlite_value* val = &valsBefore[i];
if (val->type) {
if (bindValue(stmt, n, val)) {
return 1;
}
n++;
}
}
rc = sqlite3_step(stmt);
sqlite3_finalize(stmt);
if (rc != SQLITE_DONE) {
return rc;
}
return SQLITE_OK;
}
int applyInstruction(const Instruction* instr, sqlite3* db)
{
switch(instr->iType) {
case SQLITE_INSERT:
return applyInsert(db, instr);
case SQLITE_UPDATE:
return applyUpdate(db, instr);
case SQLITE_DELETE:
return applyDelete(db, instr);
default:
return CHANGESET_CORRUPT;
}
}
int applyInstructionCallback(const Instruction* instr, void* context)
{
return applyInstruction(instr, (sqlite3*)context);
}
size_t readInstructionFromBuffer(const char* buf, Instruction* instr)
{
size_t nRead = 0;
instr->iType = *buf;
buf += 2; nRead += 2;
int nCol = instr->table->nCol;
if (instr->iType == SQLITE_UPDATE) {
nCol *= 2;
}
for (int i=0; i < nCol; i++) {
sqlite_value* val_p = instr->values + i;
size_t read = readValue(buf, val_p);
if (read == 0) {
return 0;
}
buf += read;
nRead += read;
}
return nRead;
}
int applyChangeset(sqlite3* db, const char* buf, size_t size)
{
int rc;
rc = sqlite3_exec(db, "SAVEPOINT changeset_apply", 0, 0, 0);
if( rc==SQLITE_OK ){
rc = sqlite3_exec(db, "PRAGMA defer_foreign_keys = 1", 0, 0, 0);
}
rc = readChangeset(buf, size, applyInstructionCallback, db);
if (rc) {
std::cerr << "Error occured." << std::endl;
rc = sqlite3_exec(db, "PRAGMA defer_foreign_keys = 0", 0, 0, 0);
rc = sqlite3_exec(db, "ROLLBACK TO SAVEPOINT changeset_apply", 0, 0, 0);
} else {
rc = sqlite3_exec(db, "PRAGMA defer_foreign_keys = 0", 0, 0, 0);
rc = sqlite3_exec(db, "RELEASE changeset_apply", 0, 0, 0);
}
return rc;
}
int applyChangeset(sqlite3* db, const char* filename)
{
std::ifstream file(filename, std::ios::binary | std::ios::ate);
const auto size = file.tellg();
if (!size) {
return 1;
}
file.seekg(0);
std::vector<char> buffer(size);
if (! file.read(buffer.data(), size)) {
return 1;
}
return applyChangeset(db, buffer.data(), size);
}
int readChangeset(const char* buf, size_t size, InstrCallback instr_callback, void* context)
{
const char* const bufStart = buf;
const char* const bufEnd = buf + size;
double lastPos = .0;
auto t1 = std::chrono::high_resolution_clock::now();
while(buf < bufEnd) {
char op = buf[0];
buf++;
// Read OP
if (op != 'T') {
return CHANGESET_CORRUPT;
}
// Read number of columns
u32 nCol;
u8 varintLen = getVarint32((u8*)buf, nCol);
buf += varintLen;
// Read Primary Key flags
std::vector<int> PKs(nCol);
for (u32 i=0; i < nCol; i++) {
PKs[i] = (bool) buf[i];
}
buf += nCol;
// Read table name
const char* tableName = buf;
size_t tableNameLen = std::strlen(tableName);
buf += tableNameLen + 1;
size_t instrRead = 0;
TableInfo table;
table.PKs = PKs.data();
table.nCol = nCol;
table.tableName = tableName;
Instruction instr;
instr.table = &table;
instr.values = new sqlite_value[nCol*2];
while (buf < bufEnd && buf[0] != 'T') {
instrRead = readInstructionFromBuffer(buf, &instr);
if (instrRead == 0) {
std::cerr << "Error reading instruction from buffer." << std::endl;
delete[] instr.values;
return CHANGESET_INSTRUCTION_CORRUPT;
}
int rc;
if (instr_callback && (rc = instr_callback(&instr, context))) {
std::cerr << "Error applying instruction. Callback returned " << rc << std::endl;
delete[] instr.values;
return CHANGESET_CALLBACK_ERROR;
}
buf += instrRead;
double pos = (double)(buf - bufStart) / (bufEnd - bufStart) * 100;
if ((pos - lastPos) > 0.1) {
auto t2 = std::chrono::high_resolution_clock::now();
auto time_span = std::chrono::duration_cast<std::chrono::duration<double>>(t2 - t1);
std::cerr << pos << "%, " << (time_span.count() / pos) * 100 << std::endl;
lastPos = pos;
}
}
delete[] instr.values;
}
return 0;
}
int readChangeset(const char* filename, InstrCallback instr_callback, void* context)
{
std::ifstream file(filename, std::ios::binary | std::ios::ate);
const auto size = file.tellg();
if (!size) {
return 1;
}
file.seekg(0);
std::vector<char> buffer(size);
if (! file.read(buffer.data(), size)) {
return 1;
}
return readChangeset(buffer.data(), size, instr_callback, context);
}
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