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115 lines
5.7 KiB
Markdown
115 lines
5.7 KiB
Markdown
# Cozo (standalone executable)
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[![server](https://img.shields.io/github/v/release/cozodb/cozo)](https://github.com/cozodb/cozo/releases)
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This document describes how to set up cozo (standalone executable).
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To learn how to use CozoDB (CozoScript), read the [docs](https://docs.cozodb.org/en/latest/index.html).
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## Download
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The standalone executable for Cozo can be downloaded from the [release page](https://github.com/cozodb/cozo/releases).
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Look for those with names `cozo-*`.
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Those with names `cozo_all-*` supports additional storage backends
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such as [TiKV](https://tikv.org/) storage, but are larger.
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## Starting the server
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Run the cozo command in a terminal:
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```bash
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./cozo server
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```
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This starts an in-memory, non-persistent database.
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For more options such as how to run a persistent database with other storage engines,
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see `./cozo server -h`
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To stop Cozo, press `CTRL-C`, or send `SIGTERM` to the process with e.g. `kill`.
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## The REPL
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Run `./cozo repl` to enter a terminal-based REPL. The engine options can be used when
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invoking the executable to choose the backend.
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You can use the following meta ops in the REPL:
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* `%set <KEY> <VALUE>`: set a parameter that can be used in queries.
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* `%unset <KEY>`: unset a parameter.
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* `%clear`: unset all parameters.
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* `%params`: print all set parameters.
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* `%import <FILE OR URL>`: import data in JSON format from the file or URL.
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* `%save <FILE>`: the result of the next successful query will be saved in JSON format in a file instead of printed on screen. If `<FILE>` is omitted, then the effect of any previous `%save` command is nullified.
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* `%backup <FILE>`: the current database will be backed up into the file.
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* `%restore <FILE>`: restore the data in the backup to the current database. The current database must be empty.
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## The query API
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Queries are run by sending HTTP POST requests to the server.
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By default, the API endpoint is `http://127.0.0.1:9070/text-query`.
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A JSON body of the following form is expected:
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```json
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{
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"script": "<COZOSCRIPT QUERY STRING>",
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"params": {}
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}
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```
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params should be an object of named parameters. For example, if params is `{"num": 1}`,
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then `$num` can be used anywhere in your query string where an expression is expected.
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Always use params instead of concatenating strings when you need parametrized queries.
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The HTTP API always responds in JSON. If a request is successful, then its `"ok"` field will be `true`,
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and the `"rows"` field will contain the data for the resulting relation, and `"headers"` will contain
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the headers. If an error occurs, then `"ok"` will contain `false`, the error message will be in `"message"`
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and a nicely-formatted diagnostic will be in `"display"` if available.
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> Cozo is designed to run in a trusted environment and be used by trusted clients.
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> It does not come with elaborate authentication and security features.
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> If you must access Cozo remotely, you are responsible for setting up firewalls, encryptions and proxies yourself.
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>
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> As a guard against users accidentally exposing sensitive data,
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> If you bind Cozo to non-loopback addresses,
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> Cozo will generate a token string and require all queries
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> to provide the token string in the HTTP header field `x-cozo-auth`.
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> The warning printed when you start Cozo with a
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> non-default binding will tell you where to find the token string.
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> This “security measure” is not considered sufficient for any purpose
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> and is only intended as a last defence against carelessness.
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>
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> In some environments, setting the header may be difficult or impossible
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> for some of the APIs. In this case you can pass the token in the query parameter `auth`.
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## API
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* `POST /text-query`, described above.
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* `GET /export/{relations: String}`, where `relations` is a comma-separated list of relations to export.
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* `PUT /import`, import data into the database. Data should be in `application/json` MIME type in the body,
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in the same format as returned in the `data` field in the `/export` API.
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* `POST /backup`, backup database, should supply a JSON body of the form `{"path": <PATH>}`
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* `POST /import-from-backup`, import data into the database from a backup. Should supply a JSON body
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of the form `{"path": <PATH>, "relations": <ARRAY OF RELATION NAMES>}`.
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* `GET /`, if you open this in your browser and open your developer tools, you will be able to use
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a very simple client to query this database.
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> For `import` and `import-from-backup`, triggers are _not_ run for the relations, if any exists.
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If you need to activate triggers, use queries with parameters.
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The following are experimental:
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* `GET(SSE) /changes/{relation: String}` get changes when mutations are made against a relation, relies on [SSE](https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events).
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* `GET(SSE) /rules/{name: String}` register a custom fixed rule and receive requests for computation.
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Query parameter `arity` must also be present.
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* `POST /rule-result/{id}` post results of custom fixed rule computation back to the server, used together with the last API.
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* `POST /transact` start a multi-statement transaction, the ID returned is used in the following two APIs.
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Need to set the `write=true` query parameter if mutations are present.
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* `POST /transact/{id}` do queries inside a multi-statement transaction, JSON payload expected is the same as for `/text-query`.
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* `PUT /transact/{id}` commit or abort a multi-statement transaction. JSON payload is of the form `{"abort": <bool>}`, pass `false` for commit and `true` for abort. If you forget to do this, a resource leak results, even for read-only transactions.
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## Building
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Building `cozo` requires a [Rust toolchain](https://rustup.rs). Run
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```bash
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cargo build --release -p cozo-bin -F compact -F storage-rocksdb
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```
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