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sqlite_actor
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Absorbed by the Syndesizer 

https://git.syndicate-lang.org/ehmry/syndicate_utils
This commit is contained in:
Emery Hemingway 2024-01-09 13:25:13 +02:00
parent 023d50abbb
commit 32c2d251ab
12 changed files with 2 additions and 189 deletions
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2
.envrc
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source_env ..
use nix

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.gitignore vendored
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/nim.cfg

31
README.md
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# sqlite_actor
Syndicate actor for accessing SQLite databases.
Absorbed by the Syndesizer
## Build
Depends on the [SQLcipher](https://www.zetetic.net/sqlcipher/) library and pkg-config.
## Example configuration
```
? <example-dataspace ?ds> [
$ds <query example-row "SELECT id, name FROM stuff">
$ds ? <example-row ?id ?name> [
$log ! <log "-" { row: <example-row $id $name> }>
]
<require-service <daemon sqlite_actor>>
? <service-object <daemon sqlite_actor> ?cap> [
$cap {
dataspace: $ds
database: "/var/db/example.db"
}
]
<daemon sqlite_actor {
argv: [ "/usr/local/bin/sqlite_actor" ]
protocol: application/syndicate
}>
]
```
https://git.syndicate-lang.org/ehmry/syndicate_utils

2
Tupfile
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include_rules
: lock.json |> !nim_cfg |> | ./<lock>

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Tuprules.tup
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include ../syndicate-nim/depends.tup
NIM_FLAGS += --path:$(TUP_CWD)/../syndicate-nim/src
NIM_GROUPS += $(TUP_CWD)/<lock>

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lock.json
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{"depends":[{"method":"fetchzip","packages":["hashlib"],"path":"/nix/store/v03nzlpdgbfxd2zhcnkfbkq01d5kqxcl-source","rev":"84e0247555e4488594975900401baaf5bbbfb53","sha256":"1pfczsv8kl36qpv543f93d2y2vgz2acckssfap7l51s2x62m6qwx","srcDir":"","url":"https://github.com/khchen/hashlib/archive/84e0247555e4488594975900401baaf5bbbfb53.tar.gz"},{"method":"fetchzip","packages":["nimcrypto"],"path":"/nix/store/zyr8zwh7vaiycn1s4r8cxwc71f2k5l0h-source","ref":"traditional-api","rev":"602c5d20c69c76137201b5d41f788f72afb95aa8","sha256":"1dmdmgb6b9m5f8dyxk781nnd61dsk3hdxqks7idk9ncnpj9fng65","srcDir":"","url":"https://github.com/cheatfate/nimcrypto/archive/602c5d20c69c76137201b5d41f788f72afb95aa8.tar.gz"},{"method":"fetchzip","packages":["npeg"],"path":"/nix/store/ffkxmjmigfs7zhhiiqm0iw2c34smyciy-source","ref":"1.2.1","rev":"26d62fdc40feb84c6533956dc11d5ee9ea9b6c09","sha256":"0xpzifjkfp49w76qmaylan8q181bs45anmp46l4bwr3lkrr7bpwh","srcDir":"src","url":"https://github.com/zevv/npeg/archive/26d62fdc40feb84c6533956dc11d5ee9ea9b6c09.tar.gz"},{"method":"fetchzip","packages":["preserves"],"path":"/nix/store/nrcpzf9hx70kry3gwhrdzcs3qicjncjh-source","ref":"20231021","rev":"edece399be70818208bf2263c30cb2bcf435bbff","sha256":"0xmw35wmw3a4lja9q4qvlvpxv3xk0hnkjg4fwfw6f3inh6zfiqki","srcDir":"src","url":"https://git.syndicate-lang.org/ehmry/preserves-nim/archive/edece399be70818208bf2263c30cb2bcf435bbff.tar.gz"},{"method":"fetchzip","packages":["syndicate"],"path":"/nix/store/1y3nnpp2mhxqmdb3xh4c4k5k5l9hhqk3-source","ref":"20231019","rev":"57b99b20e7db1b97b1cb9c6df574bd13983c26fc","sha256":"1kgb3a78igs37xkmv8cbaxa17qdjf2h43vdmpda517c9086ggsn5","srcDir":"src","url":"https://git.syndicate-lang.org/ehmry/syndicate-nim/archive/57b99b20e7db1b97b1cb9c6df574bd13983c26fc.tar.gz"}]}

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shell.nix
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{ pkgs ? import <nixpkgs> { } }:
pkgs.nim2Packages.buildNimPackage {
name = "dummy";
propagatedNativeBuildInputs = [ pkgs.pkg-config ];
propagatedBuildInputs = [ pkgs.sqlcipher ];
}

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sql.prs
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version 1 .
; When asserted the actor reponds with
; rows as records of the given label and
; row columns as record fields.
Query = <query @label any @statement string> .

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sqlite_actor.nimble
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version = "20231021"
author = "Emery Hemingway"
description = "Syndicate Actor for accessing SQLite databases"
license = "Unlicense"
srcDir = "src"
bin = @["sqlite_actor"]
requires "nim >= 1.6.10", "syndicate >= 20230518"

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src/Tupfile
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include_rules
: foreach ../*.prs |> !preserves_schema_nim |> {schema}
: sqlite_actor.nim | $(SYNDICATE_PROTOCOL) {schema} |> !nim_bin |> {bin}
: {bin} |> !assert_built |>

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src/sql.nim
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import
preserves
type
Query* {.preservesRecord: "query".} = object
`label`*: Preserve[void]
`statement`*: string
proc `$`*(x: Query): string =
`$`(toPreserve(x))
proc encode*(x: Query): seq[byte] =
encode(toPreserve(x))

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src/sqlite_actor.nim
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# SPDX-FileCopyrightText: ☭ Emery Hemingway
# SPDX-License-Identifier: Unlicense
# Avoid Sqlite3 from the standard library because it is
# only held together by wishful thinking and dlload.
{.passC: staticExec("pkg-config --cflags sqlcipher").}
{.passL: staticExec("pkg-config --libs sqlcipher").}
{.pragma: sqlite3h, header: "sqlite3.h".}
var
SQLITE_VERSION_NUMBER {.importc, sqlite3h.}: cint
SQLITE_OK {.importc, sqlite3h.}: cint
SQLITE_ROW {.importc, sqlite3h.}: cint
SQLITE_DONE {.importc, sqlite3h.}: cint
SQLITE_OPEN_READONLY {.importc, sqlite3h.}: cint
const
SQLITE_INTEGER = 1
SQLITE_FLOAT = 2
SQLITE_TEXT = 3
SQLITE_BLOB = 4
# SQLITE_NULL = 5
type
Sqlite3 {.importc: "sqlite3", sqlite3h.} = distinct pointer
Stmt {.importc: "sqlite3_stmt", sqlite3h.} = distinct pointer
{.pragma: importSqlite3, importc: "sqlite3_$1", sqlite3h.}
proc libversion_number: cint {.importSqlite3.}
proc open_v2(filename: cstring; ppDb: ptr Sqlite3; flags: cint; zVfs: cstring): cint {.importSqlite3.}
proc close(ds: Sqlite3): int32 {.discardable, importSqlite3.}
proc errmsg(db: Sqlite3): cstring {.importSqlite3.}
proc prepare_v2(db: Sqlite3; zSql: cstring, nByte: cint; ppStmt: ptr Stmt; pzTail: ptr cstring): cint {.importSqlite3.}
proc step(para1: Stmt): cint {.importSqlite3.}
proc column_count(stmt: Stmt): int32 {.importSqlite3.}
proc column_blob(stmt: Stmt; col: cint): pointer {.importSqlite3.}
proc column_bytes(stmt: Stmt; col: cint): cint {.importSqlite3.}
proc column_double(stmt: Stmt; col: cint): float64 {.importSqlite3.}
proc column_int64(stmt: Stmt; col: cint): int64 {.importSqlite3.}
proc column_text(stmt: Stmt; col: cint): cstring {.importSqlite3.}
proc column_type(stmt: Stmt; col: cint): cint {.importSqlite3.}
proc finalize(stmt: Stmt): cint {.importSqlite3.}
doAssert libversion_number() == SQLITE_VERSION_NUMBER
import preserves, syndicate, syndicate/relays
import ./sql
proc logError(db: Sqlite3; context: string) =
writeLine(stderr, errmsg(db), ": ", context)
type
Value = Preserve[void]
Args {.preservesDictionary.} = object
database: string
dataspace: Cap
proc extractValue(stmt: Stmt; col: cint): Value =
case column_type(stmt, col)
of SQLITE_INTEGER:
result = toPreserve(column_int64(stmt, col))
of SQLITE_FLOAT:
result = toPreserve(column_double(stmt, col))
of SQLITE_TEXT:
result = Value(kind: pkString, string: newString(column_bytes(stmt, col)))
if result.string.len > 0:
copyMem(addr result.string[0], column_text(stmt, col), result.string.len)
of SQLITE_BLOB:
result = Value(kind: pkByteString, bytes: newSeq[byte](column_bytes(stmt, col)))
if result.bytes.len > 0:
copyMem(addr result.bytes[0], column_blob(stmt, col), result.bytes.len)
else:
result = initRecord[void]("null")
proc extractRecord(stmt: Stmt; label: Value, arity: cint): Value =
result = initRecord(label, arity)
for col in 0..<arity: result.record[col] = extractValue(stmt, col)
runActor("main") do (root: Cap; turn: var Turn):
connectStdio(turn, root)
during(turn, root, ?Args) do (path: string, ds: Cap):
var db: Sqlite3
if open_v2(path, addr db, SQLITE_OPEN_READONLY, nil) != SQLITE_OK:
logError(db, path)
else:
during(turn, ds, ?Query) do (label: Value, statement: string):
var stmt: Stmt
if prepare_v2(db, statement, statement.len.cint, addr stmt, nil) != SQLITE_OK:
logError(db, statement)
else:
try:
let arity = column_count(stmt)
var res = step(stmt)
while res == SQLITE_ROW:
var rec = extractRecord(stmt, label, arity)
discard publish(turn, ds, rec)
res = step(stmt)
assert res != 100
if res != SQLITE_DONE:
logError(db, statement)
finally:
if finalize(stmt) != SQLITE_OK: logError(db, statement)
do:
close(db)