91 lines
4.3 KiB
Markdown
91 lines
4.3 KiB
Markdown
sessions
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========
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[](https://godoc.org/github.com/gorilla/sessions) [](https://travis-ci.org/gorilla/sessions)
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[](https://sourcegraph.com/github.com/gorilla/sessions?badge)
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gorilla/sessions provides cookie and filesystem sessions and infrastructure for
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custom session backends.
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The key features are:
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* Simple API: use it as an easy way to set signed (and optionally
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encrypted) cookies.
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* Built-in backends to store sessions in cookies or the filesystem.
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* Flash messages: session values that last until read.
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* Convenient way to switch session persistency (aka "remember me") and set
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other attributes.
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* Mechanism to rotate authentication and encryption keys.
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* Multiple sessions per request, even using different backends.
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* Interfaces and infrastructure for custom session backends: sessions from
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different stores can be retrieved and batch-saved using a common API.
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Let's start with an example that shows the sessions API in a nutshell:
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```go
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import (
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"net/http"
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"github.com/gorilla/sessions"
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)
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var store = sessions.NewCookieStore([]byte("something-very-secret"))
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func MyHandler(w http.ResponseWriter, r *http.Request) {
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// Get a session. We're ignoring the error resulted from decoding an
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// existing session: Get() always returns a session, even if empty.
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session, _ := store.Get(r, "session-name")
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// Set some session values.
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session.Values["foo"] = "bar"
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session.Values[42] = 43
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// Save it before we write to the response/return from the handler.
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session.Save(r, w)
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}
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```
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First we initialize a session store calling `NewCookieStore()` and passing a
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secret key used to authenticate the session. Inside the handler, we call
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`store.Get()` to retrieve an existing session or a new one. Then we set some
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session values in session.Values, which is a `map[interface{}]interface{}`.
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And finally we call `session.Save()` to save the session in the response.
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Important Note: If you aren't using gorilla/mux, you need to wrap your handlers
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with
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[`context.ClearHandler`](http://www.gorillatoolkit.org/pkg/context#ClearHandler)
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as or else you will leak memory! An easy way to do this is to wrap the top-level
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mux when calling http.ListenAndServe:
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```go
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http.ListenAndServe(":8080", context.ClearHandler(http.DefaultServeMux))
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```
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The ClearHandler function is provided by the gorilla/context package.
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More examples are available [on the Gorilla
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website](http://www.gorillatoolkit.org/pkg/sessions).
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## Store Implementations
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Other implementations of the `sessions.Store` interface:
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* [github.com/starJammer/gorilla-sessions-arangodb](https://github.com/starJammer/gorilla-sessions-arangodb) - ArangoDB
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* [github.com/yosssi/boltstore](https://github.com/yosssi/boltstore) - Bolt
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* [github.com/srinathgs/couchbasestore](https://github.com/srinathgs/couchbasestore) - Couchbase
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* [github.com/denizeren/dynamostore](https://github.com/denizeren/dynamostore) - Dynamodb on AWS
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* [github.com/savaki/dynastore](https://github.com/savaki/dynastore) - DynamoDB on AWS (Official AWS library)
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* [github.com/bradleypeabody/gorilla-sessions-memcache](https://github.com/bradleypeabody/gorilla-sessions-memcache) - Memcache
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* [github.com/dsoprea/go-appengine-sessioncascade](https://github.com/dsoprea/go-appengine-sessioncascade) - Memcache/Datastore/Context in AppEngine
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* [github.com/kidstuff/mongostore](https://github.com/kidstuff/mongostore) - MongoDB
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* [github.com/srinathgs/mysqlstore](https://github.com/srinathgs/mysqlstore) - MySQL
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* [github.com/EnumApps/clustersqlstore](https://github.com/EnumApps/clustersqlstore) - MySQL Cluster
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* [github.com/antonlindstrom/pgstore](https://github.com/antonlindstrom/pgstore) - PostgreSQL
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* [github.com/boj/redistore](https://github.com/boj/redistore) - Redis
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* [github.com/boj/rethinkstore](https://github.com/boj/rethinkstore) - RethinkDB
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* [github.com/boj/riakstore](https://github.com/boj/riakstore) - Riak
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* [github.com/michaeljs1990/sqlitestore](https://github.com/michaeljs1990/sqlitestore) - SQLite
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* [github.com/wader/gormstore](https://github.com/wader/gormstore) - GORM (MySQL, PostgreSQL, SQLite)
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* [github.com/gernest/qlstore](https://github.com/gernest/qlstore) - ql
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## License
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BSD licensed. See the LICENSE file for details.
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