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Types ¶
type Chain ¶
type Chain struct {
// contains filtered or unexported fields
}
Chain acts as a list of reactor.Handler constructors. Chain is effectively immutable: once created, it will always hold the same set of constructors in the same order.
func New ¶
func New(constructors ...Constructor) Chain
New creates a new chain, memorizing the given list of middleware constructors. New serves no other function, constructors are only called upon a call to Then().
func (Chain) Append ¶
func (c Chain) Append(constructors ...Constructor) Chain
Append extends a chain, adding the specified constructors as the last ones in the request flow.
Append returns a new chain, leaving the original one untouched.
stdChain := alice.New(m1, m2) extChain := stdChain.Append(m3, m4) // requests in stdChain go m1 -> m2 // requests in extChain go m1 -> m2 -> m3 -> m4
func (Chain) Then ¶
Then chains the middleware and returns the final reactor.Handler.
New(m1, m2, m3).Then(h)
is equivalent to:
m1(m2(m3(h)))
When the request comes in, it will be passed to m1, then m2, then m3 and finally, the given handler (assuming every middleware calls the following one).
A chain can be safely reused by calling Then() several times.
stdStack := chain.New(ratelimitHandler, csrfHandler) indexPipe = stdStack.Then(indexHandler) authPipe = stdStack.Then(authHandler)
Note that constructors are called on every call to Then() and thus several instances of the same middleware will be created when a chain is reused in this way. For proper middleware, this should cause no problems.
func (Chain) ThenFunc ¶
func (c Chain) ThenFunc(fn reactor.HandlerFunc) reactor.Handler
ThenFunc works identically to Then, but takes a HandlerFunc instead of a Handler.
The following two statements are equivalent:
c.Then(reactor.HandlerFunc(fn)) c.ThenFunc(fn)
ThenFunc provides all the guarantees of Then.
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