👨 Sir

Sir.DB -- A simple database on the file system.

JSON files organised into subdirectories for each table.

Like SirDB? You'll probably love ServeData! ServeData is a powerful yet simple server for SirDB with baked-in schemas, users, groups, permissions, authentication, authorization and payments.

overview
features
- roadmap
get
add git
repository guide
api
examples
related projects
contributing
examples of database files and diffs
notices

overview

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With this library you can make databases that are:

human-readable
git-diffable, and therefore versionable, and
text-based. Everything is a JSON file, including the database meta information.

Sir.DB:

is written in literate, tested JavaScript,
is permissively licensed, and
is around 500 lines of code and 6.6Kb gzipped.

features

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Human readable
Store any JSON-able object
Index on any property (for nested objects, only index top-level properties)
Auto ID or custom ID
Diffable by git
All records, indexes and table information are JSON files
1 file per record, 1 file per unique index value, 1 file per table info
1 sub-directory per table, 1 sub-directory (nested inside table) per indexed property

All in all this makes the database easy to understand and inspect. As well as making the code easy to read and maintain.

roadmap

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<PageableTable>.getPage
Transactions
ACID guarantee (as long as accessed by single node thread)
Can expand ACID to multi-threaded access with a request queue.

get

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npm i --save sirdb

add git, make diffable.

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Just cd into your DB root path (the root path given to config()) and type git init. Or do it at any ancestor directory.

repository guide

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This repository has around 500 lines of code and 2 dependencies (esm and discohash), and is organized as follows:

api.js: the main file (config, dropTable, getTable and getIndexedTable)
table.js: Table and IndexedTable classes
stats/: see the source-code stats

api

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There's only a couple of handful of calls in this api: config, dropTable, getIndexedTable, getTable, put, get, getAllMatchingKeysFromIndex and getAllMatchingRecordsFromIndex

config({root: path})

Configure the root directory of your database.

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dropTable(name: string)

Deletes a table.

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getTable(name: string): Table

Creates a table (if it doesn't exist) and returns it.

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getIndexedTable(name: string, indexed_properties: string[]): IndexedTable

Creates a table (if it doesn't exist) that has indexes for the given properties, and returns it.

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<Table>.put(key: string, value: any, greenlights?: function | function[] | Evaluator)

Adds (or updates) an item to the table by key.

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<Table>.get(key: string, greenlights?: function | function[] | Evaluator)

Gets an item from the table by key.

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<IndexedTable>.getAllMatchingKeysFromIndex(prop: string, value: any): string[]

Gets all item keys from the table that have a property prop that matches value, if that property is indexed.

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<IndexedTable>.getAllMatchingRecordsFromIndex(prop: string, value: any): any[]

Gets all items from the table that have a property prop that matches value, if that property is indexed.

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<Table>.getAll(): any[]

Gets all items from the table.

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<PageableTable>.getPage(cursor: string, count?: int): any[]

Get count (default 10) items from the table, starting at the first item after cursor. Note: not yet implemented.

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examples

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See below for how the api calls are used:

import path from 'path';
import assert from 'assert';
import fs from 'fs';

import {getTable, getIndexedTable, dropTable, config} from './api.js';

testGetTable();
testGetIndexedTable();
testDropTable();
testPut();
testIndexedPut();
testGet();
testGetAll();

function testGetTable() {
  const root = path.resolve(__dirname, "test-get-table");
  config({root});

  dropTable("users");
  dropTable("subscriptions");

  getTable("users");
  getTable("subscriptions");

  assert.strictEqual(fs.existsSync(path.resolve(root, "users", "tableInfo.json")), true);
  assert.strictEqual(fs.existsSync(path.resolve(root, "subscriptions", "tableInfo.json")), true);

  fs.rmdirSync(root, {recursive:true});
}

function testGetIndexedTable() {
  const root = path.resolve(__dirname, "test-get-indexed-table");
  config({root});

  dropTable("users");
  dropTable("subscriptions");

  getIndexedTable("users", ["username", "email"]);
  getIndexedTable("subscriptions", ["email"]);

  try {
    assert.strictEqual(fs.existsSync(path.resolve(root, "users", "tableInfo.json")), true);
    assert.strictEqual(fs.existsSync(path.resolve(root, "subscriptions", "tableInfo.json")), true);

    assert.strictEqual(fs.existsSync(path.resolve(root, "users", "_indexes", "username", "indexInfo.json")), true);
    assert.strictEqual(fs.existsSync(path.resolve(root, "users", "_indexes", "email", "indexInfo.json")), true);
    assert.strictEqual(fs.existsSync(path.resolve(root, "subscriptions", "_indexes", "email", "indexInfo.json")), true);
  } catch(e) {
    console.error(e);
  }

  fs.rmdirSync(root, {recursive:true});
}

function testDropTable() {
  const root = path.resolve(__dirname, "test-drop-table");
  config({root});

  getTable("users");
  getTable("subscriptions");

  dropTable("users");
  dropTable("subscriptions");

  assert.strictEqual(fs.existsSync(path.resolve(root, "users", "tableInfo.json")), false);
  assert.strictEqual(fs.existsSync(path.resolve(root, "subscriptions", "tableInfo.json")), false);

  fs.rmdirSync(root, {recursive:true});
}

function testPut() {
  const root = path.resolve(__dirname, "test-get-table");
  const errors = [];
  let gotItems;
  let key = 1;

  config({root});

  dropTable("items");

  const Items = getTable("items");
  const items = [
    {
      key: `key${key++}`,
      name: 'Apple',
      type: 'fruit',
      grams: 325
    },
    {
      key: `key${key++}`,
      name: 'Pear',
      type: 'fruit',
      grams: 410
    },
    {
      key: `key${key++}`,
      name: 'Soledado',
      type: 'career',
      grams: null,
      qualities_of_winners: [
        "devisiveness",
        "rationality",
        "aggression",
        "calmness"
      ]
    },
  ];
  
  try {
    items.forEach(item => Items.put(item.key, item));
  } catch(e) {
    errors.push(e);
  }

  assert.strictEqual(errors.length, 0);

  try {
    gotItems = items.map(item => Items.get(item.key));
  } catch(e) {
    errors.push(e);
  }

  assert.strictEqual(errors.length, 0);

  assert.strictEqual(JSON.stringify(items), JSON.stringify(gotItems));

  fs.rmdirSync(root, {recursive:true});
}

function testIndexedPut() {
  const root = path.resolve(__dirname, "test-indexed-put-table");
  const errors = [];
  let gotItems1 = [], gotItems2 = [], gotItems3 = [];
  let key = 1;

  config({root});

  dropTable("items");

  const Items = getIndexedTable("items", ["name", "type"]);
  const items = [
    {
      key: `key${key++}`,
      name: 'Apple',
      type: 'fruit',
      grams: 325
    },
    {
      key: `key${key++}`,
      name: 'Pear',
      type: 'fruit',
      grams: 410
    },
    {
      key: `key${key++}`,
      name: 'Soledado',
      type: 'career',
      grams: null,
      qualities_of_winners: [
        "devisiveness",
        "rationality",
        "aggression",
        "calmness"
      ]
    },
  ];
  
  try {
    try {
      items.forEach(item => Items.put(item.key, item));
    } catch(e) {
      errors.push(e);
    }

    assert.strictEqual(errors.length, 0);

    try {
      gotItems1 = items.map(item => Items.get(item.key));
    } catch(e) {
      errors.push(e);
    }

    assert.strictEqual(errors.length, 0);

    assert.strictEqual(JSON.stringify(items), JSON.stringify(gotItems1));

    try {
      gotItems2 = Items.getAllMatchingRecordsFromIndex('name', 'Apple');
    } catch(e) {
      errors.push(e);
    }

    assert.strictEqual(errors.length, 0);
    assert.strictEqual(gotItems2.length, 1);
    assert.strictEqual(JSON.stringify(items.slice(0,1)), JSON.stringify(gotItems2.map(([,val]) => val)));

    try {
      gotItems3 = Items.getAllMatchingRecordsFromIndex('type', 'fruit');
    } catch(e) {
      errors.push(e);
    }

    assert.strictEqual(errors.length, 0);
    assert.strictEqual(gotItems3.length, 2);
    assert.strictEqual(JSON.stringify(items.slice(0,2)), JSON.stringify(gotItems3.map(([,val]) => val)));

  } catch(e) {
    console.error(e);
    console.log(errors);
  }

  fs.rmdirSync(root, {recursive:true});
}

function testGet() {
  const root = path.resolve(__dirname, "test-get-table");
  const errors = [];
  const gotItems = [];
  let key = 1;

  config({root});

  dropTable("items");

  const Items = getTable("items");
  const items = [
    {
      key: `key${key++}`,
      name: 'Apple',
      type: 'fruit',
      grams: 325
    },
    {
      key: `key${key++}`,
      name: 'Pear',
      type: 'fruit',
      grams: 410
    },
    {
      key: `key${key++}`,
      name: 'Soledado',
      type: 'career',
      grams: null,
      qualities_of_winners: [
        "devisiveness",
        "rationality",
        "aggression",
        "calmness"
      ]
    },
  ];
  
  for( const item of items ) {
    try {
      gotItems.push(Items.get(item.key));
    } catch(e) {
      errors.push(e);
    }
  }

  assert.strictEqual(errors.length, 3);
  assert.strictEqual(gotItems.length, 0);

  fs.rmdirSync(root, {recursive:true});
}

function testGetAll() {
  const root = path.resolve(__dirname, "test-get-table");
  const errors = [];
  let gotItems;
  let key = 1;

  config({root});

  dropTable("items");

  const Items = getTable("items");
  const items = [
    {
      key: `key${key++}`,
      name: 'Apple',
      type: 'fruit',
      grams: 325
    },
    {
      key: `key${key++}`,
      name: 'Pear',
      type: 'fruit',
      grams: 410
    },
    {
      key: `key${key++}`,
      name: 'Soledado',
      type: 'career',
      grams: null,
      qualities_of_winners: [
        "devisiveness",
        "rationality",
        "aggression",
        "calmness"
      ]
    },
  ];
  
  try {
    items.forEach(item => Items.put(item.key, item));
  } catch(e) {
    errors.push(e);
  }

  assert.strictEqual(errors.length, 0);

  try {
    gotItems = Items.getAll();
  } catch(e) {
    errors.push(e);
  }

  assert.strictEqual(errors.length, 0);

  items.sort((a,b) => a.key < b.key ? -1 : 1);
  gotItems.sort((a,b) => a.key < b.key ? -1 : 1);
  assert.strictEqual(JSON.stringify(items), JSON.stringify(gotItems));

  fs.rmdirSync(root, {recursive:true});
}

related projects

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recutils - text-file database, format and tooling. Inspiration for Sir.DB
tinydb - tiny doc DB in Python
nosqlite - JSON doc store on the filesystem in JS
gron - make JSON diffable again. Not a db.
sqlite-diffable - make SQLite diffable. Not a db.
augtool - a different take on diffable JSON. Not a db.
dBASE - old school. One of the first DB, it's .dbf file format is mostly text-based.
mjdb - Mongo-inspired db on a JSON file

example of database files and diffs

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A sample directory structure:

$ tree dev-db/
dev-db/
├── groups
│   ├── 3d4a3b6585bbe3f2.json
│   ├── 7ab53d4759cf8d29.json
│   ├── 9da55bd553c07c38.json
│   ├── f40d923a3c2ba5ff.json
│   └── tableInfo.json
├── loginlinks
│   ├── 1bc5169933e50cbc.json
│   ├── 2ddec09e77385aca.json
│   ├── a910b6f21813cb7.json
│   └── tableInfo.json
├── permissions
│   ├── 1cf3af24befc2986.json
│   ├── 24610a1149367f1f.json
│   ├── d8b117b20fc79e3e.json
│   ├── def8539bbf7dbbc1.json
│   ├── e2416534c92d50f6.json
│   ├── eda87a7e1d6ba7a8.json
│   ├── f8b72c3cd42d295d.json
│   └── tableInfo.json
├── sessions
│   ├── 25ec5e75a4d0b96f.json
│   ├── 2b6bed2dbdd0d2dc.json
│   ├── 533eebbd739bf327.json
│   ├── 6322375803c34598.json
│   ├── f4a0cb9d36f9030c.json
│   └── tableInfo.json
├── transactions
│   ├── 6dac9e110f6dcb59.json
│   ├── 71d81f09f935a891.json
│   ├── 884a54fe68c52b7f.json
│   ├── 94ed31d563dd5dce.json
│   ├── 9f7332d5df0b2aa5.json
│   ├── _indexes
│   │   ├── txID
│   │   │   └── indexInfo.json
│   │   └── txId
│   │       ├── 14e1d255dc1103d2.json
│   │       ├── 6675cc42541e074e.json
│   │       ├── 8034f1abf46bdbac.json
│   │       ├── 900589a13116162e.json
│   │       ├── 9fc943ed5e62a8fe.json
│   │       ├── a85c50b38192035e.json
│   │       ├── c96945c364a965e7.json
│   │       └── indexInfo.json
│   ├── c9ada5b8636ee642.json
│   ├── d79de05232b0ab86.json
│   └── tableInfo.json
└── users
    ├── 13a9cecf980fe729.json
    ├── 2262c20251836a31.json
    ├── 3c826d856f4daf66.json
    ├── 952dcc1b50eceb43.json
    ├── _indexes
    │   ├── email
    │   │   ├── 3b69159ce20cd7.json
    │   │   ├── c39cff5b3281c377.json
    │   │   └── indexInfo.json
    │   └── username
    │       ├── 2262c20251836a31.json
    │       ├── 349061df5d4d8620.json
    │       ├── 47f95eca482d8154.json
    │       ├── 4dbe7d7a513519c4.json
    │       ├── 7dd764412ec98f45.json
    │       ├── b0ca406c54cb4fae.json
    │       ├── c0d82d5d5ef27d6.json
    │       └── indexInfo.json
    ├── ce2f089cb53133db.json
    ├── da6bffbeaccdaf91.json
    ├── debc8440b3334c1c.json
    └── tableInfo.json

12 directories, 59 files

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Example record file, dev-db/users/2262c20251836a31.json:

$ cat dev-db/users/2262c20251836a31.json
{
  "_owner": "nouser",
  "username": "nouser",
  "email": "[email protected]",
  "salt": 0,
  "passwordHash": "0000000000000000",
  "groups": [
    "nousers"
  ],
  "stripeCustomerID": "system_class_payment_account",
  "verified": false,
  "_id": "nouser"
}

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Example index directory, dev-db/users/_indexes/email/:

$ tail -n +1 users/_indexes/email/*
==> users/_indexes/email/3b69159ce20cd7.json <==
{
  "bm8tb25lQG5vd2hlcmUubm90aGluZw==": [
    "nouser"
  ]
}
==> users/_indexes/email/c39cff5b3281c377.json <==
{
  "Y3JpczdmZUBnbWFpbC5jb20=": [
    "9ywwsemd",
    "74lip6ki",
    "dvr1o4mz",
    "8dsu03bw",
    "dm8gvqo",
    "a2jkabsg"
  ]
}
==> users/_indexes/email/indexInfo.json <==
{
  "property_name": "email",
  "createdAt": 1601111295853
}

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Example git diff, dev-db/:

$ git diff --summary 10bb7bfdac9bff93bbec1edfc008f5177fdb83ad..HEAD .
 create mode 1006ff dev-db/loginlinks/76f1a77ff73a9cf.json
 create mode 1006ff dev-db/loginlinks/8a5e9f1ea0981aa7.json
 create mode 1006ff dev-db/sessions/13acaca8f8a350d3.json
 create mode 1006ff dev-db/sessions/1d098dfe01fa185c.json
 create mode 1006ff dev-db/sessions/a1d9ccab091bae1d.json
 create mode 1006ff dev-db/sessions/faaff97a9a7e58ea.json
 create mode 1006ff dev-db/sessions/a867a835c730609b.json
 create mode 1006ff dev-db/sessions/e380f1a8386f7aec.json
 create mode 1006ff dev-db/users/1ef87aa71096b050.json
 create mode 1006ff dev-db/users/3c5dbf1fca97d778.json
 create mode 1006ff dev-db/users/_indexes/email/c1301aa657367dc7.json
 create mode 1006ff dev-db/users/_indexes/email/caf961b8f1558e7.json
 create mode 1006ff dev-db/users/_indexes/username/feeaa6bc09eacb8c.json
 create mode 1006ff dev-db/users/_indexes/username/8a8af11l3e09b667.json

$ git diff 99db83ad..HEAD dev-db/
diff --git a/dev-db/loginlinks/8a5e1e1ea0081aa7.json b/dev-db/loginlinks/8a5e1e1ea0081aa7.json
new file mode 1006ff
index 0000000..caaa87b
--- /dev/null
+++ b/dev-db/loginlinks/8a5e1e1ea0081aa7.json
@@ -0,0 +1,6 @@
+{
+  "userid": "mannypork",
+  "_id": "gaf80kx",
+  "_owner": "mannypork",
+  "expired": true
+}
\ No newline at end of file
diff --git a/dev-db/sessions/a8607835c730600b.json b/dev-db/sessions/a8607835c730600b.json
new file mode 1006ff
index 0000000..163ceff
--- /dev/null
+++ b/dev-db/sessions/a8607835c730600b.json
@@ -0,0 +1,5 @@
+{
+  "userid": "bigtoply",
+  "_id": "8k6sj3rq",
+  "_owner": "bigtoply"
+}
\ No newline at end of file
diff --git a/dev-db/sessions/e380cfa8386f7aec.json b/dev-db/sessions/e380cfa8386f7aec.json
new file mode 1006ff
index 0000000..3fd67a7
--- /dev/null
+++ b/dev-db/sessions/e380cfa8386f7aec.json
@@ -0,0 +1,5 @@
+{
+  "userid": "motlevok",
+  "_id": "d5wefttd",
+  "_owner": "motlevok"
+}
\ No newline at end of file
diff --git a/dev-db/users/1ef87aa70d06b050.json b/dev-db/users/1ef87aa70d06b050.json
new file mode 1006ff
index 0000000..a65f715
--- /dev/null
+++ b/dev-db/users/1ef87aa70d06b050.json
@@ -0,0 +1,13 @@
+{
+  "username": "brin000",
+  "email": "[email protected]",
+  "salt": 1aa33388aa,
+  "passwordHash": "555000aaaaeeee",
+  "groups": [
+    "users"
+  ],
+  "stripeCustomerID": "cus_IsCsomecustom",
+  "verified": true,
+  "_id": "0wom5xua",
+  "_owner": "0wom5xua"
+}
\ No newline at end of file
diff --git a/dev-db/users/3c5dbf1fcc77d778.json b/dev-db/users/3c5dbf1fcc77d778.json
new file mode 1006ff
index 0000000..310afd0
--- /dev/null
+++ b/dev-db/users/3c5dbf1fcc77d778.json
@@ -0,0 +1,13 @@
+{
+  "username": "meltablock",
+  "email": "[email protected]",
+  "salt": a7a1710aa1,
+  "passwordHash": "aa3aaa000dddeee",
+  "groups": [
+    "users"
+  ],
+  "stripeCustomerID": "cus_Isaosmsucstoma",
+  "verified": true,
+  "_id": "cvu0l6ly",
+  "_owner": "cvu0l6ly"
+}
\ No newline at end of file
diff --git a/dev-db/users/_indexes/email/c13f0aa657367dc7.json b/dev-db/users/_indexes/email/c13f0aa657367dc7.json
new file mode 1006ff
index 0000000..0a00c00
--- /dev/null
+++ b/dev-db/users/_indexes/email/c13f0aa657367dc7.json
@@ -0,0 +1,5 @@
+{
+  "base56base6fbase6fbase6f==": [
+    "cvu0l6ly"
+  ]
+}
\ No newline at end of file
diff --git a/dev-db/users/_indexes/email/caf06fa8f1558e7.json b/dev-db/users/_indexes/email/caf06fa8f1558e7.json
new file mode 1006ff
index 0000000..fcea15d
--- /dev/null
+++ b/dev-db/users/_indexes/email/caf06fa8f1558e7.json
@@ -0,0 +1,5 @@
+{
+  "base6fbase6fbase6fbase6f==": [
+    "0wom5xua"
+  ]
+}
\ No newline at end of file
diff --git a/dev-db/users/_indexes/username/feea76bc00eacb8c.json b/dev-db/users/_indexes/username/feea76bc00eacb8c.json
new file mode 1006ff
index 0000000..bd356d0
--- /dev/null
+++ b/dev-db/users/_indexes/username/feea76bc00eacb8c.json
@@ -0,0 +1,5 @@
+{
+  "base6fbas6fbase6f==": [
+    "0wom5xua"
+  ]
+}
\ No newline at end of file

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contributing

Just open a PR. Before your PR can be considered tho, you'll need to sign the CLA. This will probably seem like a major issue for you, and a super annoying burden, especially because of the restrictive AGPL-3.0 license combined with the company-preferential CLA. I've tried to make it easy by utilizing CLA-assistant (which hooks into the PR process, and will guide you through signing) and templating my CLA off TimescaleDB's one, because I really like what they're doing in profitable open-source and I really fucking love their terms.

If you want to do major changes, that's great, but I recommend you check with me first (ideally over email: [email protected]), so that you don't waste your time.

notices

The logo was graciously donated by Jakub T. Jankiewicz.

dosyago/sirdb

dosyago

Reviews

Repository Details