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corehttp.go
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corehttp.go
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/*
Package corehttp provides utilities for the webui, gateways, and other
high-level HTTP interfaces to IPFS.
*/
package corehttp
import (
"fmt"
"net"
"net/http"
"time"
core "github.com/ipfs/go-ipfs/core"
"gx/ipfs/QmSF8fPo3jgVBAy8fpdjjYqgG87dkJgUprRBHRd2tmfgpP/goprocess"
logging "gx/ipfs/QmSpJByNKFX1sCsHBEp3R73FL4NF6FnQTEGyNAXHm2GS52/go-log"
ma "gx/ipfs/QmcyqRMCAXVtYPS4DiBrA7sezL9rRGfW8Ctx7cywL4TXJj/go-multiaddr"
manet "gx/ipfs/Qmf1Gq7N45Rpuw7ev47uWgH6dLPtdnvcMRNPkVBwqjLJg2/go-multiaddr-net"
)
var log = logging.Logger("core/server")
// ServeOption registers any HTTP handlers it provides on the given mux.
// It returns the mux to expose to future options, which may be a new mux if it
// is interested in mediating requests to future options, or the same mux
// initially passed in if not.
type ServeOption func(*core.IpfsNode, net.Listener, *http.ServeMux) (*http.ServeMux, error)
// makeHandler turns a list of ServeOptions into a http.Handler that implements
// all of the given options, in order.
func makeHandler(n *core.IpfsNode, l net.Listener, options ...ServeOption) (http.Handler, error) {
topMux := http.NewServeMux()
mux := topMux
for _, option := range options {
var err error
mux, err = option(n, l, mux)
if err != nil {
return nil, err
}
}
return topMux, nil
}
// ListenAndServe runs an HTTP server listening at |listeningMultiAddr| with
// the given serve options. The address must be provided in multiaddr format.
//
// TODO intelligently parse address strings in other formats so long as they
// unambiguously map to a valid multiaddr. e.g. for convenience, ":8080" should
// map to "/ip4/0.0.0.0/tcp/8080".
func ListenAndServe(n *core.IpfsNode, listeningMultiAddr string, options ...ServeOption) error {
addr, err := ma.NewMultiaddr(listeningMultiAddr)
if err != nil {
return err
}
list, err := manet.Listen(addr)
if err != nil {
return err
}
// we might have listened to /tcp/0 - lets see what we are listing on
addr = list.Multiaddr()
fmt.Printf("API server listening on %s\n", addr)
return Serve(n, list.NetListener(), options...)
}
func Serve(node *core.IpfsNode, lis net.Listener, options ...ServeOption) error {
handler, err := makeHandler(node, lis, options...)
if err != nil {
return err
}
addr, err := manet.FromNetAddr(lis.Addr())
if err != nil {
return err
}
// if the server exits beforehand
var serverError error
serverExited := make(chan struct{})
node.Process().Go(func(p goprocess.Process) {
serverError = http.Serve(lis, handler)
close(serverExited)
})
// wait for server to exit.
select {
case <-serverExited:
// if node being closed before server exits, close server
case <-node.Process().Closing():
log.Infof("server at %s terminating...", addr)
lis.Close()
outer:
for {
// wait until server exits
select {
case <-serverExited:
// if the server exited as we are closing, we really dont care about errors
serverError = nil
break outer
case <-time.After(5 * time.Second):
log.Infof("waiting for server at %s to terminate...", addr)
}
}
}
log.Infof("server at %s terminated", addr)
return serverError
}