mirror of
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Remove the onrequest hook
It was redundant with middlewares. Allows us to save a few operations for every incoming requests.
This commit is contained in:
Loïc Hoguin
parent
25259671f5
commit
aa4d86b81f
12 changed files with 86 additions and 260 deletions
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@ -1,45 +1,7 @@
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::: Hooks
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Cowboy provides two hooks. `onrequest` is called once the request
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line and headers have been received. `onresponse` is called just
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before sending the response.
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:: Onrequest
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The `onrequest` hook is called as soon as Cowboy finishes fetching
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the request headers. It occurs before any other processing, including
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routing. It can be used to perform any modification needed on the
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request object before continuing with the processing. If a reply is
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sent inside this hook, then Cowboy will move on to the next request,
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skipping any subsequent handling.
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This hook is a function that takes a request object as argument,
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and returns a request object. This function MUST NOT crash. Cowboy
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will not send any reply if a crash occurs in this function.
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You can specify the `onrequest` hook when creating the listener,
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inside the request options.
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``` erlang
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cowboy:start_http(my_http_listener, 100,
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[{port, 8080}],
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[
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{env, [{dispatch, Dispatch}]},
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{onrequest, fun ?MODULE:debug_hook/1}
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]
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).
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```
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The following hook function prints the request object everytime a
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request is received. This can be useful for debugging, for example.
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``` erlang
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debug_hook(Req) ->
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erlang:display(Req),
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Req.
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```
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Make sure to always return the last request object obtained.
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Hooks allow the user to customize Cowboy's behavior during specific
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operations.
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:: Onresponse
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@ -48,9 +10,9 @@ to the socket. It can be used for the purposes of logging responses,
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or for modifying the response headers or body. The best example is
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providing custom error pages.
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Note that like the `onrequest` hook, this function MUST NOT crash.
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Cowboy may or may not send a reply if this function crashes. If a reply
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is sent, the hook MUST explicitly provide all headers that are needed.
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Note that this function MUST NOT crash. Cowboy may or may not send a
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reply if this function crashes. If a reply is sent, the hook MUST
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explicitly provide all headers that are needed.
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You can specify the `onresponse` hook when creating the listener.
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inkscape:export-filename="/home/essen/extend/cowboy/guide/http_req_resp.png"
|
||||
|
|
@ -520,7 +482,7 @@
|
|||
y="0"
|
||||
xlink:href="#text5371-4-0"
|
||||
id="use5674"
|
||||
transform="translate(270.29655,434.16115)"
|
||||
transform="translate(270.29655,349.47315)"
|
||||
width="744.09448"
|
||||
height="1052.3622"
|
||||
inkscape:export-filename="/home/essen/extend/cowboy/guide/http_req_resp.png"
|
||||
|
|
@ -530,7 +492,7 @@
|
|||
xml:space="preserve"
|
||||
style="font-size:16px;font-style:normal;font-weight:normal;text-align:center;line-height:125%;letter-spacing:0px;word-spacing:0px;text-anchor:middle;fill:#77823c;fill-opacity:1;stroke:none;font-family:Sans;-inkscape-font-specification:Sans"
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x="417.30829"
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y="321.42792"
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y="236.73991"
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id="text5371-9"
|
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sodipodi:linespacing="125%"
|
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inkscape:export-filename="/home/essen/extend/cowboy/guide/http_req_resp.png"
|
||||
|
|
@ -539,12 +501,12 @@
|
|||
sodipodi:role="line"
|
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id="tspan5373-57"
|
||||
x="417.30829"
|
||||
y="321.42792">reply</tspan></text>
|
||||
y="236.73991">reply</tspan></text>
|
||||
<text
|
||||
xml:space="preserve"
|
||||
style="font-size:16px;font-style:normal;font-weight:normal;text-align:center;line-height:125%;letter-spacing:0px;word-spacing:0px;text-anchor:middle;fill:#6d8e41;fill-opacity:1;stroke:none;font-family:Sans;-inkscape-font-specification:Sans"
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x="417.30829"
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y="407.77994"
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y="323.09195"
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id="text5371-2-0"
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sodipodi:linespacing="125%"
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inkscape:export-filename="/home/essen/extend/cowboy/guide/http_req_resp.png"
|
||||
|
|
@ -553,6 +515,6 @@
|
|||
sodipodi:role="line"
|
||||
id="tspan5373-6-8"
|
||||
x="417.30829"
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y="407.77994">onresponse</tspan></text>
|
||||
y="323.09195">onresponse</tspan></text>
|
||||
</g>
|
||||
</svg>
|
||||
|
|
|
|||
|
Before Width: | Height: | Size: 21 KiB After Width: | Height: | Size: 20 KiB |
|
|
@ -25,15 +25,6 @@ A binary status can be used to set a custom message.
|
|||
|
||||
HTTP version.
|
||||
|
||||
: onrequest_fun() = fun((cowboy_req:req()) -> cowboy_req:req())
|
||||
|
||||
Fun called immediately after receiving a request.
|
||||
|
||||
It can perform any operation on the Req object, including
|
||||
reading the request body or replying. If a reply is sent,
|
||||
the processing of the request ends here, before any middleware
|
||||
is executed.
|
||||
|
||||
: onresponse_fun() = fun((http_status(), http_headers(),
|
||||
iodata(), cowboy_req:req()) -> cowboy_req:req())
|
||||
|
||||
|
|
|
|||
|
|
@ -14,7 +14,6 @@ as a Ranch protocol.
|
|||
| {max_keepalive, non_neg_integer()}
|
||||
| {max_request_line_length, non_neg_integer()}
|
||||
| {middlewares, [module()]}
|
||||
| {onrequest, cowboy:onrequest_fun()}
|
||||
| {onresponse, cowboy:onresponse_fun()}
|
||||
| {timeout, timeout()}]
|
||||
|
||||
|
|
@ -67,10 +66,6 @@ Maximum length of the request line.
|
|||
|
||||
List of middlewares to execute for every requests.
|
||||
|
||||
: onrequest (undefined)
|
||||
|
||||
Fun called every time a request is received.
|
||||
|
||||
: onresponse (undefined)
|
||||
|
||||
Fun called every time a response is sent.
|
||||
|
|
|
|||
|
|
@ -126,8 +126,7 @@ Types:
|
|||
Return the requested URL excluding the path component.
|
||||
|
||||
This function will always return `undefined` until the
|
||||
`cowboy_router` middleware has been executed. This includes
|
||||
the `onrequest` hook.
|
||||
`cowboy_router` middleware has been executed.
|
||||
|
||||
: match_cookies(Req, Fields) -> Map
|
||||
|
||||
|
|
@ -371,8 +370,7 @@ Types:
|
|||
Return the requested URL.
|
||||
|
||||
This function will always return `undefined` until the
|
||||
`cowboy_router` middleware has been executed. This includes
|
||||
the `onrequest` hook.
|
||||
`cowboy_router` middleware has been executed.
|
||||
|
||||
: version(Req) -> Version
|
||||
|
||||
|
|
|
|||
|
|
@ -6,7 +6,6 @@ The `cowboy_spdy` module implements SPDY/3 as a Ranch protocol.
|
|||
|
||||
: opts() = [{env, cowboy_middleware:env()}
|
||||
| {middlewares, [module()]}
|
||||
| {onrequest, cowboy:onrequest_fun()}
|
||||
| {onresponse, cowboy:onresponse_fun()}]
|
||||
|
||||
Configuration for the SPDY protocol handler.
|
||||
|
|
@ -30,10 +29,6 @@ Initial middleware environment.
|
|||
|
||||
List of middlewares to execute for every requests.
|
||||
|
||||
: onrequest (undefined)
|
||||
|
||||
Fun called every time a request is received.
|
||||
|
||||
: onresponse (undefined)
|
||||
|
||||
Fun called every time a response is sent.
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue