diff --git a/.eslintrc.json b/.eslintrc.json new file mode 100644 index 0000000..c62f95e --- /dev/null +++ b/.eslintrc.json @@ -0,0 +1,40 @@ +{ + "env": { + "es6": true, + "node": true + }, + "extends": "eslint:recommended", + "rules": { + "no-console": "off", + "indent": [ + "error", + 2, + { + "FunctionDeclaration": { + "parameters": "first" + }, + "FunctionExpression": { + "parameters": "first" + }, + "CallExpression": { + "arguments": 1 + }, + "SwitchCase": 1 + } + ], + "quotes": [ + "error", + "double", + { + "allowTemplateLiterals": true + } + ], + "semi": [ + "error", + "always" + ] + }, + "parserOptions": { + "ecmaVersion": 2017 + } +} \ No newline at end of file diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..308e2a1 --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +node_modules + +.idea \ No newline at end of file diff --git a/README.md b/README.md index b385a69..d197b88 100644 --- a/README.md +++ b/README.md @@ -8,12 +8,59 @@ Doesn't support queries (yet?). Moderately experimental. (This drives [Synaptograph](https://www.synaptograph.com)'s backend, and [@nornagon](https://github.com/nornagon) hasn't noticed any issues so far.) +## Requirements + +Due to the fix to resolve [high concurency issues](https://github.com/share/sharedb-postgres/issues/1) Postgres 9.5+ is now required. + +## Migrating older versions + +Older versions of this adaptor used the data type json. You will need to alter the data type prior to using if you are upgrading. + +```PLpgSQL +ALTER TABLE ops + ALTER COLUMN operation + SET DATA TYPE jsonb + USING operation::jsonb; + +ALTER TABLE snapshots + ALTER COLUMN data + SET DATA TYPE jsonb + USING data::jsonb; +``` + +In addition, the `snapshots` table might have a `NOT NULL` constraint on the `doc_type` and `data` columns that will need to be dropped, since these are set to null when a ShareDB document is deleted via its `.del()` method. + +```PLpgSQL +ALTER TABLE snapshots + ALTER COLUMN doc_type + DROP NOT NULL; + +ALTER TABLE snapshots + ALTER COLUMN data + DROP NOT NULL; +``` + ## Usage `sharedb-postgres` wraps native [node-postgres](https://github.com/brianc/node-postgres), and it supports the same configuration options. To instantiate a sharedb-postgres wrapper, invoke the module and pass in your -PostgreSQL configuration as an argument. For example: +PostgreSQL configuration as an argument or use environmental arguments. + +For example using environmental arugments: + +```js +var db = require('sharedb-postgres')(); +var backend = require('sharedb')({db: db}) +``` + +Then executing via the command line + +``` +PGUSER=dbuser PGPASSWORD=secretpassword PGHOST=database.server.com PGDATABASE=mydb PGPORT=5433 npm start +``` + +Example using an object ```js var db = require('sharedb-postgres')({host: 'localhost', database: 'mydb'}); diff --git a/index.js b/index.js index 442bd84..19ed421 100644 --- a/index.js +++ b/index.js @@ -1,5 +1,5 @@ -var DB = require('sharedb').DB; -var pg = require('pg'); +var DB = require("sharedb").DB; +var pg = require("pg"); // Postgres-backed ShareDB database @@ -15,22 +15,17 @@ module.exports = PostgresDB; PostgresDB.prototype = Object.create(DB.prototype); -PostgresDB.prototype.close = function(callback) { +PostgresDB.prototype.close = function (callback) { this.closed = true; this.pool.end(); - + if (callback) callback(); }; -function rollback(client, done) { - client.query('ROLLBACK', function(err) { - return done(err); - }) -} // Persists an op and snapshot if it is for the next version. Calls back with // callback(err, succeeded) -PostgresDB.prototype.commit = function(collection, id, op, snapshot, options, callback) { +PostgresDB.prototype.commit = function (collection, id, op, snapshot, options, callback) { /* * op: CreateOp { * src: '24545654654646', @@ -41,114 +36,118 @@ PostgresDB.prototype.commit = function(collection, id, op, snapshot, options, ca * } * snapshot: PostgresSnapshot */ - this.pool.connect(function(err, client, done) { + this.pool.connect((err, client, done) => { if (err) { done(client); callback(err); return; } - function commit() { - client.query('COMMIT', function(err) { - done(err); - if (err) { - callback(err); - } else { - callback(null, true); - } - }) - } - client.query( - 'SELECT max(version) AS max_version FROM ops WHERE collection = $1 AND doc_id = $2', - [collection, id], - function(err, res) { - var max_version = res.rows[0].max_version; - if (max_version == null) - max_version = 0; - if (snapshot.v !== max_version + 1) { - return callback(null, false); - } - client.query('BEGIN', function(err) { - client.query( - 'INSERT INTO ops (collection, doc_id, version, operation) VALUES ($1, $2, $3, $4)', - [collection, id, snapshot.v, op], - function(err, res) { - if (err) { - // TODO: if err is "constraint violation", callback(null, false) instead - rollback(client, done); - callback(err); - return; - } - if (snapshot.v === 1) { - client.query( - 'INSERT INTO snapshots (collection, doc_id, doc_type, version, data) VALUES ($1, $2, $3, $4, $5)', - [collection, id, snapshot.type, snapshot.v, snapshot.data], - function(err, res) { - // TODO: - // if the insert was successful and did insert, callback(null, true) - // if the insert was successful and did not insert, callback(null, false) - // if there was an error, rollback and callback(error) - if (err) { - rollback(client, done); - callback(err); - return; - } - commit(); - } - ) - } else { - client.query( - 'UPDATE snapshots SET doc_type = $3, version = $4, data = $5 WHERE collection = $1 AND doc_id = $2 AND version = ($4 - 1)', - [collection, id, snapshot.type, snapshot.v, snapshot.data], - function(err, res) { - // TODO: - // if any rows were updated, success - // if 0 rows were updated, rollback and not success - // if error, rollback and not success - if (err) { - rollback(client, done); - callback(err); - return; - } - commit(); - } - ) - } - } - ) - }) + + /* + * This query uses common table expression to upsert the snapshot table + * (iff the new version is exactly 1 more than the latest table or if + * the document id does not exists) + * + * It will then insert into the ops table if it is exactly 1 more than the + * latest table or it the first operation and iff the previous insert into + * the snapshot table is successful. + * + * This result of this query the version of the newly inserted operation + * If either the ops or the snapshot insert fails then 0 rows are returned + * + * If 0 zeros are return then the callback must return false + * + * Casting is required as postgres thinks that collection and doc_id are + * not varchar + */ + // ZW: We also should have the first op version be 0 (the actual value + // of op.v) instead of 1, in order to match the reference MemoryDB + // implementation. Catching up outdated clients who reconnect may be + // buggy otherwise. + const query = { + name: "sdb-commit-op-and-snap", + text: `WITH snapshot_id AS ( + INSERT INTO snapshots (collection, doc_id, doc_type, version, data) + SELECT $1::varchar collection, $2::varchar doc_id, + $3 snap_type, $4 snap_v, $5 snap_data + WHERE $4 = ( + SELECT version+1 snap_v + FROM snapshots + WHERE collection = $1 AND doc_id = $2 + FOR UPDATE + ) OR NOT EXISTS ( + SELECT 1 + FROM snapshots + WHERE collection = $1 AND doc_id = $2 + FOR UPDATE + ) + ON CONFLICT (collection, doc_id) DO + UPDATE SET doc_type = $3, version = $4, data = $5 + RETURNING version + ) + INSERT INTO ops (collection, doc_id, version, operation) + SELECT $1::varchar collection, $2::varchar doc_id, + $6 op_v, $7 op + WHERE ( + $6 = ( + SELECT max(version)+1 + FROM ops + WHERE collection = $1 AND doc_id = $2 + ) OR NOT EXISTS ( + SELECT 1 + FROM ops + WHERE collection = $1 AND doc_id = $2 + ) + ) AND EXISTS (SELECT 1 FROM snapshot_id) + RETURNING version`, + values: [ + collection, id, snapshot.type, snapshot.v, snapshot.data, op.v, op + ] + }; + client.query(query, (err, res) => { + if (err) { + callback(err); + } else if (res.rows.length === 0) { + done(client); + callback(null, false); } - ) - }) + else { + done(client); + callback(null, true); + } + }); + + }); }; // Get the named document from the database. The callback is called with (err, // snapshot). A snapshot with a version of zero is returned if the docuemnt // has never been created in the database. -PostgresDB.prototype.getSnapshot = function(collection, id, fields, options, callback) { - this.pool.connect(function(err, client, done) { +PostgresDB.prototype.getSnapshot = function (collection, id, fields, options, callback) { + this.pool.connect(function (err, client, done) { if (err) { done(client); callback(err); return; } client.query( - 'SELECT version, data, doc_type FROM snapshots WHERE collection = $1 AND doc_id = $2 LIMIT 1', + "SELECT version, data, doc_type FROM snapshots WHERE collection = $1 AND doc_id = $2 LIMIT 1", [collection, id], - function(err, res) { + function (err, res) { done(); if (err) { callback(err); return; } if (res.rows.length) { - var row = res.rows[0] + var row = res.rows[0]; var snapshot = new PostgresSnapshot( id, row.version, row.doc_type, row.data, undefined // TODO: metadata - ) + ); callback(null, snapshot); } else { var snapshot = new PostgresSnapshot( @@ -157,12 +156,12 @@ PostgresDB.prototype.getSnapshot = function(collection, id, fields, options, cal null, undefined, undefined - ) + ); callback(null, snapshot); } } - ) - }) + ); + }); }; // Get operations between [from, to) noninclusively. (Ie, the range should @@ -174,28 +173,31 @@ PostgresDB.prototype.getSnapshot = function(collection, id, fields, options, cal // The version will be inferred from the parameters if it is missing. // // Callback should be called as callback(error, [list of ops]); -PostgresDB.prototype.getOps = function(collection, id, from, to, options, callback) { - this.pool.connect(function(err, client, done) { +PostgresDB.prototype.getOps = function (collection, id, from, to, options, callback) { + this.pool.connect(function (err, client, done) { if (err) { done(client); callback(err); return; } + + // ZW: Add explicit row ordering here client.query( - 'SELECT version, operation FROM ops WHERE collection = $1 AND doc_id = $2 AND version >= $3 AND version < $4', + "SELECT version, operation FROM ops WHERE collection = $1 AND doc_id =" + + " $2 AND version >= $3 AND version < $4 ORDER BY version ASC", [collection, id, from, to], - function(err, res) { + function (err, res) { done(); if (err) { callback(err); return; } - callback(null, res.rows.map(function(row) { + callback(null, res.rows.map(function (row) { return row.operation; })); } - ) - }) + ); + }); }; function PostgresSnapshot(id, version, type, data, meta) { diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..2597ca1 --- /dev/null +++ b/package-lock.json @@ -0,0 +1,1328 @@ +{ + "name": "sharedb-postgres", + "version": "3.0.0-zw.1", + "lockfileVersion": 1, + "requires": true, + "dependencies": { + "acorn": { + "version": "5.7.1", + "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.1.tgz", + "integrity": "sha512-d+nbxBUGKg7Arpsvbnlq61mc12ek3EY8EQldM3GPAhWJ1UVxC6TDGbIvUMNU6obBX3i1+ptCIzV4vq0gFPEGVQ==", + "dev": true + }, + "acorn-jsx": { + "version": "4.1.1", + "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-4.1.1.tgz", + "integrity": "sha512-JY+iV6r+cO21KtntVvFkD+iqjtdpRUpGqKWgfkCdZq1R+kbreEl8EcdcJR4SmiIgsIQT33s6QzheQ9a275Q8xw==", + "dev": true, + "requires": { 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"description": "PostgreSQL adapter for ShareDB", "main": "index.js", "scripts": { @@ -8,10 +8,18 @@ }, "author": "Jeremy Apthorp ", "license": "MIT", - "keywords": ["sharedb", "sharejs", "share", "postgres"], + "keywords": [ + "sharedb", + "sharejs", + "share", + "postgres" + ], "repository": "share/sharedb-postgres", "dependencies": { "pg": "^7.4.1", "sharedb": "^1.0.0-beta.7" + }, + "devDependencies": { + "eslint": "^5.2.0" } } diff --git a/structure.sql b/structure.sql index 606b5fc..66906d8 100644 --- a/structure.sql +++ b/structure.sql @@ -2,15 +2,15 @@ CREATE TABLE ops ( collection character varying(255) not null, doc_id character varying(255) not null, version integer not null, - operation json not null, -- {v:0, create:{...}} or {v:n, op:[...]} + operation jsonb not null, -- {v:0, create:{...}} or {v:n, op:[...]} PRIMARY KEY (collection, doc_id, version) ); CREATE TABLE snapshots ( collection character varying(255) not null, doc_id character varying(255) not null, - doc_type character varying(255) not null, + doc_type character varying(255), -- Will be set to null if deleted version integer not null, - data json not null, + data jsonb, -- Will be set to null if deleted PRIMARY KEY (collection, doc_id) );