mirror of https://github.com/waku-org/nwaku.git
489 lines
15 KiB
Nim
489 lines
15 KiB
Nim
{.push raises: [].}
|
|
# The code in this file is an adaptation of the Sqlite KV Store found in nim-eth.
|
|
# https://github.com/status-im/nim-eth/blob/master/eth/db/kvstore_sqlite3.nim
|
|
#
|
|
# Most of it is a direct copy, the only unique functions being `get` and `put`.
|
|
|
|
import
|
|
std/[os, strutils, sequtils, algorithm],
|
|
stew/results,
|
|
chronicles,
|
|
sqlite3_abi
|
|
import
|
|
./common
|
|
|
|
logScope:
|
|
topics = "sqlite"
|
|
|
|
type
|
|
Sqlite = ptr sqlite3
|
|
|
|
NoParams* = tuple
|
|
RawStmtPtr* = ptr sqlite3_stmt
|
|
SqliteStmt*[Params; Result] = distinct RawStmtPtr
|
|
|
|
AutoDisposed[T: ptr|ref] = object
|
|
val: T
|
|
|
|
template dispose(db: Sqlite) =
|
|
discard sqlite3_close(db)
|
|
|
|
template dispose(rawStmt: RawStmtPtr) =
|
|
discard sqlite3_finalize(rawStmt)
|
|
|
|
template dispose*(sqliteStmt: SqliteStmt) =
|
|
discard sqlite3_finalize(RawStmtPtr sqliteStmt)
|
|
|
|
proc release[T](x: var AutoDisposed[T]): T =
|
|
result = x.val
|
|
x.val = nil
|
|
|
|
proc disposeIfUnreleased[T](x: var AutoDisposed[T]) =
|
|
mixin dispose
|
|
if x.val != nil:
|
|
dispose(x.release)
|
|
|
|
template checkErr*(op, cleanup: untyped) =
|
|
if (let v = (op); v != SQLITE_OK):
|
|
cleanup
|
|
return err($sqlite3_errstr(v))
|
|
|
|
template checkErr*(op) =
|
|
checkErr(op): discard
|
|
|
|
type
|
|
SqliteDatabase* = ref object of RootObj
|
|
env*: Sqlite
|
|
|
|
type DataProc* = proc(s: RawStmtPtr) {.closure.} # the nim-eth definition is different; one more indirection
|
|
|
|
const NoopRowHandler* = proc(s: RawStmtPtr) {.closure.} = discard
|
|
|
|
proc new*(T: type SqliteDatabase,
|
|
path: string,
|
|
readOnly=false):
|
|
DatabaseResult[T] =
|
|
|
|
var env: AutoDisposed[ptr sqlite3]
|
|
defer: disposeIfUnreleased(env)
|
|
|
|
let flags = if readOnly: SQLITE_OPEN_READONLY
|
|
else: SQLITE_OPEN_READWRITE or SQLITE_OPEN_CREATE
|
|
|
|
if path != ":memory:":
|
|
try:
|
|
createDir(parentDir(path))
|
|
except OSError, IOError:
|
|
return err("sqlite: cannot create database directory")
|
|
|
|
checkErr sqlite3_open_v2(path, addr env.val, flags.cint, nil)
|
|
|
|
template prepare(q: string, cleanup: untyped): ptr sqlite3_stmt =
|
|
var s: ptr sqlite3_stmt
|
|
checkErr sqlite3_prepare_v2(env.val, q, q.len.cint, addr s, nil):
|
|
cleanup
|
|
s
|
|
|
|
template checkExec(s: ptr sqlite3_stmt) =
|
|
if (let x = sqlite3_step(s); x != SQLITE_DONE):
|
|
discard sqlite3_finalize(s)
|
|
return err($sqlite3_errstr(x))
|
|
|
|
if (let x = sqlite3_finalize(s); x != SQLITE_OK):
|
|
return err($sqlite3_errstr(x))
|
|
|
|
template checkExec(q: string) =
|
|
let s = prepare(q): discard
|
|
checkExec(s)
|
|
|
|
template checkWalPragmaResult(journalModePragma: ptr sqlite3_stmt) =
|
|
if (let x = sqlite3_step(journalModePragma); x != SQLITE_ROW):
|
|
discard sqlite3_finalize(journalModePragma)
|
|
return err($sqlite3_errstr(x))
|
|
|
|
if (let x = sqlite3_column_type(journalModePragma, 0); x != SQLITE3_TEXT):
|
|
discard sqlite3_finalize(journalModePragma)
|
|
return err($sqlite3_errstr(x))
|
|
|
|
if (let x = sqlite3_column_text(journalModePragma, 0);
|
|
x != "memory" and x != "wal"):
|
|
discard sqlite3_finalize(journalModePragma)
|
|
return err("Invalid pragma result: " & $x)
|
|
|
|
let journalModePragma = prepare("PRAGMA journal_mode = WAL;"): discard
|
|
checkWalPragmaResult(journalModePragma)
|
|
checkExec(journalModePragma)
|
|
|
|
ok(SqliteDatabase(env: env.release))
|
|
|
|
template prepare*(env: Sqlite, q: string, cleanup: untyped): ptr sqlite3_stmt =
|
|
var s: ptr sqlite3_stmt
|
|
checkErr sqlite3_prepare_v2(env, q, q.len.cint, addr s, nil):
|
|
cleanup
|
|
s
|
|
|
|
proc bindParam*(s: RawStmtPtr, n: int, val: auto): cint =
|
|
when val is openarray[byte]|seq[byte]:
|
|
# The constant, SQLITE_TRANSIENT, may be passed to indicate that the object is to be copied
|
|
# prior to the return from sqlite3_bind_*(). The object and pointer to it must remain valid
|
|
# until then. SQLite will then manage the lifetime of its private copy.
|
|
#
|
|
# From: https://www.sqlite.org/c3ref/bind_blob.html
|
|
if val.len > 0:
|
|
sqlite3_bind_blob(s, n.cint, unsafeAddr val[0], val.len.cint, SQLITE_TRANSIENT)
|
|
else:
|
|
sqlite3_bind_blob(s, n.cint, nil, 0.cint, SQLITE_TRANSIENT)
|
|
elif val is int32:
|
|
sqlite3_bind_int(s, n.cint, val)
|
|
elif val is uint32:
|
|
sqlite3_bind_int64(s, n.cint, val)
|
|
elif val is int64:
|
|
sqlite3_bind_int64(s, n.cint, val)
|
|
elif val is float64:
|
|
sqlite3_bind_double(s, n.cint, val)
|
|
# Note: bind_text not yet supported in sqlite3_abi wrapper
|
|
# elif val is string:
|
|
# sqlite3_bind_text(s, n.cint, val.cstring, -1, nil) # `-1` implies string length is the number of bytes up to the first null-terminator
|
|
else:
|
|
{.fatal: "Please add support for the '" & $typeof(val) & "' type".}
|
|
|
|
template bindParams(s: RawStmtPtr, params: auto) =
|
|
when params is tuple:
|
|
var i = 1
|
|
for param in fields(params):
|
|
checkErr bindParam(s, i, param)
|
|
inc i
|
|
else:
|
|
checkErr bindParam(s, 1, params)
|
|
|
|
proc exec*[P](s: SqliteStmt[P, void], params: P): DatabaseResult[void] =
|
|
let s = RawStmtPtr s
|
|
bindParams(s, params)
|
|
|
|
let res =
|
|
if (let v = sqlite3_step(s); v != SQLITE_DONE):
|
|
err($sqlite3_errstr(v))
|
|
else:
|
|
ok()
|
|
|
|
# release implict transaction
|
|
discard sqlite3_reset(s) # same return information as step
|
|
discard sqlite3_clear_bindings(s) # no errors possible
|
|
|
|
res
|
|
|
|
template readResult(s: RawStmtPtr, column: cint, T: type): auto =
|
|
when T is Option:
|
|
if sqlite3_column_type(s, column) == SQLITE_NULL:
|
|
none(typeof(default(T).get()))
|
|
else:
|
|
some(readSimpleResult(s, column, typeof(default(T).get())))
|
|
else:
|
|
readSimpleResult(s, column, T)
|
|
|
|
template readResult(s: RawStmtPtr, T: type): auto =
|
|
when T is tuple:
|
|
var res: T
|
|
var i = cint 0
|
|
for field in fields(res):
|
|
field = readResult(s, i, typeof(field))
|
|
inc i
|
|
res
|
|
else:
|
|
readResult(s, 0.cint, T)
|
|
|
|
proc exec*[Params, Res](s: SqliteStmt[Params, Res],
|
|
params: Params,
|
|
onData: DataProc): DatabaseResult[bool] =
|
|
let s = RawStmtPtr s
|
|
bindParams(s, params)
|
|
|
|
try:
|
|
var gotResults = false
|
|
while true:
|
|
let v = sqlite3_step(s)
|
|
case v
|
|
of SQLITE_ROW:
|
|
onData(s)
|
|
gotResults = true
|
|
of SQLITE_DONE:
|
|
break
|
|
else:
|
|
return err($sqlite3_errstr(v))
|
|
return ok gotResults
|
|
finally:
|
|
# release implicit transaction
|
|
discard sqlite3_reset(s) # same return information as step
|
|
discard sqlite3_clear_bindings(s) # no errors possible
|
|
|
|
proc query*(db: SqliteDatabase, query: string, onData: DataProc):
|
|
DatabaseResult[bool] =
|
|
var s = prepare(db.env, query): discard
|
|
|
|
try:
|
|
var gotResults = false
|
|
while true:
|
|
let v = sqlite3_step(s)
|
|
case v
|
|
of SQLITE_ROW:
|
|
onData(s)
|
|
gotResults = true
|
|
of SQLITE_DONE:
|
|
break
|
|
else:
|
|
return err($sqlite3_errstr(v))
|
|
return ok gotResults
|
|
finally:
|
|
# release implicit transaction
|
|
discard sqlite3_reset(s) # same return information as step
|
|
discard sqlite3_clear_bindings(s) # no errors possible
|
|
discard sqlite3_finalize(s) # NB: dispose of the prepared query statement and free associated memory
|
|
|
|
proc prepareStmt*(
|
|
db: SqliteDatabase,
|
|
stmt: string,
|
|
Params: type,
|
|
Res: type
|
|
): DatabaseResult[SqliteStmt[Params, Res]] =
|
|
var s: RawStmtPtr
|
|
checkErr sqlite3_prepare_v2(db.env, stmt, stmt.len.cint, addr s, nil)
|
|
ok SqliteStmt[Params, Res](s)
|
|
|
|
proc close*(db: SqliteDatabase) =
|
|
discard sqlite3_close(db.env)
|
|
|
|
db[] = SqliteDatabase()[]
|
|
|
|
## Maintenance procedures
|
|
|
|
# TODO: Cache this value in the SqliteDatabase object.
|
|
# Page size should not change during the node execution time
|
|
proc getPageSize*(db: SqliteDatabase): DatabaseResult[int64] =
|
|
## Query or set the page size of the database. The page size must be a power of
|
|
## two between 512 and 65536 inclusive.
|
|
var size: int64
|
|
proc handler(s: RawStmtPtr) =
|
|
size = sqlite3_column_int64(s, 0)
|
|
|
|
let res = db.query("PRAGMA page_size;", handler)
|
|
if res.isErr():
|
|
return err("failed to get page_size")
|
|
|
|
return ok(size)
|
|
|
|
proc getFreelistCount*(db: SqliteDatabase): DatabaseResult[int64] =
|
|
## Return the number of unused pages in the database file.
|
|
var count: int64
|
|
proc handler(s: RawStmtPtr) =
|
|
count = sqlite3_column_int64(s, 0)
|
|
|
|
let res = db.query("PRAGMA freelist_count;", handler)
|
|
if res.isErr():
|
|
return err("failed to get freelist_count")
|
|
|
|
return ok(count)
|
|
|
|
proc getPageCount*(db: SqliteDatabase): DatabaseResult[int64] =
|
|
## Return the total number of pages in the database file.
|
|
var count: int64
|
|
proc handler(s: RawStmtPtr) =
|
|
count = sqlite3_column_int64(s, 0)
|
|
|
|
let res = db.query("PRAGMA page_count;", handler)
|
|
if res.isErr():
|
|
return err("failed to get page_count")
|
|
|
|
return ok(count)
|
|
|
|
proc gatherSqlitePageStats*(db: SqliteDatabase):
|
|
DatabaseResult[(int64, int64, int64)] =
|
|
let
|
|
pageSize = ?db.getPageSize()
|
|
pageCount = ?db.getPageCount()
|
|
freelistCount = ?db.getFreelistCount()
|
|
|
|
return ok((pageSize, pageCount, freelistCount))
|
|
|
|
proc vacuum*(db: SqliteDatabase): DatabaseResult[void] =
|
|
## The VACUUM command rebuilds the database file, repacking it into a minimal amount of disk space.
|
|
let res = db.query("VACUUM;", NoopRowHandler)
|
|
if res.isErr():
|
|
return err("vacuum failed")
|
|
|
|
return ok()
|
|
|
|
## Database scheme versioning
|
|
|
|
proc getUserVersion*(database: SqliteDatabase): DatabaseResult[int64] =
|
|
## Get the value of the user-version integer.
|
|
##
|
|
## The user-version is an integer that is available to applications to use however they want.
|
|
## SQLite makes no use of the user-version itself. This integer is stored at offset 60 in
|
|
## the database header.
|
|
##
|
|
## For more info check: https://www.sqlite.org/pragma.html#pragma_user_version
|
|
var version: int64
|
|
proc handler(s: ptr sqlite3_stmt) =
|
|
version = sqlite3_column_int64(s, 0)
|
|
|
|
let res = database.query("PRAGMA user_version;", handler)
|
|
if res.isErr():
|
|
return err("failed to get user_version")
|
|
|
|
ok(version)
|
|
|
|
proc setUserVersion*(database: SqliteDatabase, version: int64):
|
|
DatabaseResult[void] =
|
|
## Set the value of the user-version integer.
|
|
##
|
|
## The user-version is an integer that is available to applications to use however they want.
|
|
## SQLite makes no use of the user-version itself. This integer is stored at offset 60 in
|
|
## the database header.
|
|
##
|
|
## For more info check: https://www.sqlite.org/pragma.html#pragma_user_version
|
|
let query = "PRAGMA user_version=" & $version & ";"
|
|
let res = database.query(query, NoopRowHandler)
|
|
if res.isErr():
|
|
return err("failed to set user_version")
|
|
|
|
ok()
|
|
|
|
## Migration scripts
|
|
|
|
proc getMigrationScriptVersion(path: string): DatabaseResult[int64] =
|
|
let name = extractFilename(path)
|
|
let parts = name.split("_", 1)
|
|
|
|
try:
|
|
let version = parseInt(parts[0])
|
|
return ok(version)
|
|
except ValueError:
|
|
return err("failed to parse file version: " & name)
|
|
|
|
proc isSqlScript(path: string): bool =
|
|
path.toLower().endsWith(".sql")
|
|
|
|
proc listSqlScripts(path: string): DatabaseResult[seq[string]] =
|
|
var scripts = newSeq[string]()
|
|
|
|
try:
|
|
for scriptPath in walkDirRec(path):
|
|
if isSqlScript(scriptPath):
|
|
scripts.add(scriptPath)
|
|
else:
|
|
debug "invalid migration script", file=scriptPath
|
|
except OSError:
|
|
return err("failed to list migration scripts: " & getCurrentExceptionMsg())
|
|
|
|
ok(scripts)
|
|
|
|
proc filterMigrationScripts(paths: seq[string],
|
|
lowVersion, highVersion: int64,
|
|
direction: string = "up"):
|
|
seq[string] =
|
|
## Returns migration scripts whose version fall between lowVersion and highVersion (inclusive)
|
|
let filterPredicate = proc(script: string): bool =
|
|
if not isSqlScript(script):
|
|
return false
|
|
|
|
if direction != "" and not script.toLower().endsWith("." & direction & ".sql"):
|
|
return false
|
|
|
|
let scriptVersionRes = getMigrationScriptVersion(script)
|
|
if scriptVersionRes.isErr():
|
|
return false
|
|
|
|
let scriptVersion = scriptVersionRes.value
|
|
return lowVersion < scriptVersion and scriptVersion <= highVersion
|
|
|
|
paths.filter(filterPredicate)
|
|
|
|
proc sortMigrationScripts(paths: seq[string]): seq[string] =
|
|
## Sort migration scripts paths alphabetically
|
|
paths.sorted(system.cmp[string])
|
|
|
|
proc loadMigrationScripts(paths: seq[string]): DatabaseResult[seq[string]] =
|
|
var loadedScripts = newSeq[string]()
|
|
|
|
for script in paths:
|
|
try:
|
|
loadedScripts.add(readFile(script))
|
|
except OSError, IOError:
|
|
return err("failed to load script '" & script & "': " & getCurrentExceptionMsg())
|
|
|
|
ok(loadedScripts)
|
|
|
|
proc breakIntoStatements(script: string): seq[string] =
|
|
var statements = newSeq[string]()
|
|
|
|
for chunk in script.split(';'):
|
|
if chunk.strip().isEmptyOrWhitespace():
|
|
continue
|
|
|
|
let statement = chunk.strip() & ";"
|
|
statements.add(statement)
|
|
|
|
statements
|
|
|
|
proc migrate*(db: SqliteDatabase,
|
|
targetVersion: int64,
|
|
migrationsScriptsDir: string):
|
|
DatabaseResult[void] =
|
|
## Compares the `user_version` of the sqlite database with the provided `targetVersion`, then
|
|
## it runs migration scripts if the `user_version` is outdated. The `migrationScriptsDir` path
|
|
## points to the directory holding the migrations scripts once the db is updated, it sets the
|
|
## `user_version` to the `tragetVersion`.
|
|
##
|
|
## NOTE: Down migration it is not currently supported
|
|
let userVersion = ?db.getUserVersion()
|
|
|
|
if userVersion == targetVersion:
|
|
debug "database schema is up to date", userVersion=userVersion, targetVersion=targetVersion
|
|
return ok()
|
|
|
|
info "database schema is outdated", userVersion=userVersion, targetVersion=targetVersion
|
|
|
|
# Load migration scripts
|
|
var migrationScriptsPaths = ?listSqlScripts(migrationsScriptsDir)
|
|
migrationScriptsPaths = filterMigrationScripts(migrationScriptsPaths, lowVersion=userVersion, highVersion=targetVersion, direction="up")
|
|
migrationScriptsPaths = sortMigrationScripts(migrationScriptsPaths)
|
|
|
|
if migrationScriptsPaths.len <= 0:
|
|
debug "no scripts to be run"
|
|
return ok()
|
|
|
|
let scripts = ?loadMigrationScripts(migrationScriptsPaths)
|
|
|
|
# Run the migration scripts
|
|
for script in scripts:
|
|
|
|
for statement in script.breakIntoStatements():
|
|
debug "executing migration statement", statement=statement
|
|
|
|
let execRes = db.query(statement, NoopRowHandler)
|
|
if execRes.isErr():
|
|
error "failed to execute migration statement", statement=statement, error=execRes.error
|
|
return err("failed to execute migration statement")
|
|
|
|
debug "migration statement executed succesfully", statement=statement
|
|
|
|
# Update user_version
|
|
?db.setUserVersion(targetVersion)
|
|
|
|
debug "database user_version updated", userVersion=targetVersion
|
|
ok()
|
|
|
|
proc performSqliteVacuum*(db: SqliteDatabase): DatabaseResult[void] =
|
|
## SQLite database vacuuming
|
|
# TODO: Run vacuuming conditionally based on database page stats
|
|
# if (pageCount > 0 and freelistCount > 0):
|
|
|
|
debug "starting sqlite database vacuuming"
|
|
|
|
let resVacuum = db.vacuum()
|
|
if resVacuum.isErr():
|
|
return err("failed to execute vacuum: " & resVacuum.error)
|
|
|
|
debug "finished sqlite database vacuuming"
|
|
ok()
|