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192 lines
5.7 KiB
Markdown
192 lines
5.7 KiB
Markdown
# About
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A very simple web server providing an HTTP interface to Redis. It uses [hiredis](https://github.com/antirez/hiredis), [jansson](https://github.com/akheron/jansson) and libevent.
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<pre>
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make clean all
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./webdis &
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curl http://127.0.0.1:7379/SET/hello/world
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→ {"SET":[true,"OK"]}
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curl http://127.0.0.1:7379/GET/hello
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→ {"GET":"world"}
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curl -d "GET/hello" http://127.0.0.1:7379/
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→ {"GET":"world"}
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</pre>
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# Features
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* GET and POST are supported.
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* JSON output by default, optional JSONP parameter.
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* Raw Redis 2.0 protocol output with `?format=raw`
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* HTTP 1.1 pipelining (50,000 http requests per second on a desktop Linux machine.)
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* Connects to Redis using a TCP or UNIX socket.
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* Restricted commands by IP range (CIDR subnet + mask) or HTTP Basic Auth, returning 403 errors.
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* Possible Redis authentication in the config file.
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* Pub/Sub using `Transfer-Encoding: chunked`, works with JSONP as well. Webdis can be used as a Comet server.
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* Drop privileges on startup.
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* For `GET` commands:
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* MIME type in a second key with `/GET/k?typeKey=type-k`. This will transform the `GET` request into `MGET` and fetch both `k` and `type-k`. If `type-k` is a string, it will be used as Content-Type in the response. If the key doesn't exist or isn't a string, `binary/octet-stream` is used instead.
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* Custom MIME type with `?type=text/plain` (or any other MIME type).
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* URL-encoded parameters for binary data or slashes. For instance, `%2f` is decoded as `/` but not used as a command separator.
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# Ideas, TODO...
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* Support PUT, DELETE, HEAD, OPTIONS? How? For which commands?
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* MULTI/EXEC/DISCARD/WATCH are disabled at the moment; find a way to use them.
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* Add logs.
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* Support POST of raw Redis protocol data, and execute the whole thing. This could be useful for MULTI/EXEC transactions.
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* Enrich config file:
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* Provide timeout (this needs to be added to hiredis first.)
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* Multi-server support, using consistent hashing.
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* Send your ideas using the github tracker, on twitter [@yowgi](http://twitter.com/yowgi) or by mail to n.favrefelix@gmail.com.
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* Add WebSocket support, allow cross-origin XHR.
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# HTTP error codes
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* Unknown HTTP verb: 405 Method Not Allowed
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* Redis is unreachable: 503 Service Unavailable
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* Matching ETag sent using `If-None-Match`: 304 Not Modified.
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* Could also be used:
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* Timeout on the redis side: 503 Service Unavailable (this isn't supported by HiRedis yet).
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* Missing key: 404 Not Found.
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* Unauthorized command (disabled in config file): 403 Forbidden.
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# Command format
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The URI `/COMMAND/arg0/arg1/.../argN` executes the command on Redis and returns the response to the client. GET and POST are supported:
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* `GET /COMMAND/arg0/.../argN`
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* `POST /` with `COMMAND/arg0/.../argN` in the HTTP body.
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# ACL
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Access control is configured in `webdis.json`. Each configuration tries to match a client profile according to two criterias:
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* [CIDR](http://en.wikipedia.org/wiki/CIDR) subnet + mask
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* [HTTP Basic Auth](http://en.wikipedia.org/wiki/Basic_access_authentication) in the format of "user:password".
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Each ACL contains two lists of commands, `enabled` and `disabled`. All commands being enabled by default, it is up to the administrator to disable or re-enable them on a per-profile basis.
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Examples:
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<pre>
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{
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"disabled": ["DEBUG", "FLUSHDB", "FLUSHALL"],
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},
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{
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"http_basic_auth": "user:password",
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"disabled": ["DEBUG", "FLUSHDB", "FLUSHALL"],
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"enabled": ["SET"]
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},
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{
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"ip": "192.168.10.0/24",
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"enabled": ["SET"]
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},
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{
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"http_basic_auth": "user:password",
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"ip": "192.168.10.0/24",
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"enabled": ["SET", "DEL"]
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}
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</pre>
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ACLs are interpreted in order, later authorizations superseding earlier ones if a client matches several.
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# JSON output
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JSON is the default output format. Each command returns a JSON object with the command as a key and the result as a value.
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**Examples:**
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<pre>
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// string
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$ curl http://127.0.0.1:7379/GET/y
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{"GET":"41"}
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// number
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$ curl http://127.0.0.1:7379/INCR/y
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{"INCR":42}
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// list
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$ curl http://127.0.0.1:7379/LRANGE/x/0/1
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{"LRANGE":["abc","def"]}
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// status
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$ curl http://127.0.0.1:7379/TYPE/y
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{"TYPE":[true,"string"]}
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// error, which is basically a status
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$ curl http://127.0.0.1:7379/MAKE-ME-COFFEE
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{"MAKE-ME-COFFEE":[false,"ERR unknown command 'MAKE-ME-COFFEE'"]}
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// JSONP callback:
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$ curl "http://127.0.0.1:7379/TYPE/y?jsonp=myCustomFunction"
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myCustomFunction({"TYPE":[true,"string"]})
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</pre>
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# RAW output
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This is the raw output of Redis; enable it with `?format=raw`.
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<pre>
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// string
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$ curl http://127.0.0.1:7379/GET/z?format=raw
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$5
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hello
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// number
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curl http://127.0.0.1:7379/INCR/a?format=raw
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:2
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// list
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$ curl http://127.0.0.1:7379/LRANGE/x/0/-1?format=raw
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*2
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$3
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abc
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$3
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def
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// status
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$ curl http://127.0.0.1:7379/TYPE/y?format=raw
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+zset
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// error, which is basically a status
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$ curl http://127.0.0.1:7379/MAKE-ME-COFFEE?format=raw
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-ERR unknown command 'MAKE-ME-COFFEE'
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</pre>
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# Custom content-type
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Webdis can serve `GET` requests with a custom content-type. There are two ways of doing this; the content-type can be in a key that is fetched with the content, or given as a query string parameter.
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**Content-Type in parameter:**
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<pre>
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curl -v "http://127.0.0.1:7379/GET/hello.html?type=text/html"
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[...]
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< HTTP/1.1 200 OK
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< Content-Type: text/html
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< Date: Mon, 03 Jan 2011 20:43:36 GMT
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< Content-Length: 137
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<
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<!DOCTYPE html>
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<html>
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...
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</html>
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</pre>
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**Content-Type in a separate key:**
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<pre>
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curl "http://127.0.0.1:7379/SET/hello.type/text%2fhtml"
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{"SET":[true,"OK"]}
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curl "http://127.0.0.1:7379/GET/hello.type"
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{"GET":"text/html"}
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curl -v "http://127.0.0.1:7379/GET/hello.html?typeKey=hello.type"
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[...]
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< HTTP/1.1 200 OK
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< Content-Type: text/html
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< Date: Mon, 03 Jan 2011 20:56:43 GMT
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< Content-Length: 137
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<
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<!DOCTYPE html>
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<html>
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...
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</html>
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</pre>
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