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ssh-pubkey-server/httpserver/server.go at main · flashbots/ssh-pubkey-server · GitHub
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httpserver
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server.go
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148 lines (124 loc) · 3.64 KB
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ssh-pubkey-server
/
httpserver
/
server.go
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package
httpserver
import
(
"bytes"
"context"
"errors"
"log/slog"
"net/http"
"os"
"time"
"github.com/flashbots/go-utils/httplogger"
"github.com/flashbots/ssh-pubkey-server/common"
"github.com/flashbots/ssh-pubkey-server/metrics"
chi
"github.com/go-chi/chi/v5"
"github.com/go-chi/chi/v5/middleware"
"go.uber.org/atomic"
)
type
HTTPServerConfig
struct
{
ListenAddr
string
MetricsAddr
string
EnablePprof
bool
Log
*
slog.
Logger
DrainDuration
time.
Duration
GracefulShutdownDuration
time.
Duration
ReadTimeout
time.
Duration
WriteTimeout
time.
Duration
SSHPubkeyPaths
[]
string
}
type
Server
struct
{
cfg
*
HTTPServerConfig
isReady
atomic.
Bool
log
*
slog.
Logger
srv
*
http.
Server
metricsSrv
*
metrics.
MetricsServer
}
var
errMalformedPubkey
=
errors
.
New
(
"malformed pubkey: want at least 2 fields"
)
func
readAndFormatPubkey
(
path
string
) ([]
byte
,
error
) {
if
path
==
""
{
return
nil
,
nil
}
pubkey
,
err
:=
os
.
ReadFile
(
path
)
if
err
!=
nil
{
return
nil
,
err
}
// pubkey is in the form <type> <key> <host>. we want to drop the host.
// A file may be empty or half-written (e.g. while the container is writing
// its host key), so guard against fewer than two fields rather than panic.
fields
:=
bytes
.
Fields
(
pubkey
)
if
len
(
fields
)
<
2
{
return
nil
,
errMalformedPubkey
}
return
bytes
.
Join
(
fields
[
0
:
2
], []
byte
(
" "
)),
nil
}
func
New
(
cfg
*
HTTPServerConfig
) (
srv
*
Server
,
err
error
) {
metricsSrv
,
err
:=
metrics
.
New
(
common
.
PackageName
,
cfg
.
MetricsAddr
)
if
err
!=
nil
{
return
nil
,
err
}
srv
=
&
Server
{
cfg
:
cfg
,
log
:
cfg
.
Log
,
srv
:
nil
,
metricsSrv
:
metricsSrv
,
}
srv
.
isReady
.
Swap
(
true
)
mux
:=
chi
.
NewRouter
()
mux
.
With
(
srv
.
httpLogger
).
Get
(
"/pubkey"
,
srv
.
handleGetPubkey
)
// Never serve at `/` (root) path
mux
.
With
(
srv
.
httpLogger
).
Get
(
"/livez"
,
srv
.
handleLivenessCheck
)
mux
.
With
(
srv
.
httpLogger
).
Get
(
"/readyz"
,
srv
.
handleReadinessCheck
)
mux
.
With
(
srv
.
httpLogger
).
Get
(
"/drain"
,
srv
.
handleDrain
)
mux
.
With
(
srv
.
httpLogger
).
Get
(
"/undrain"
,
srv
.
handleUndrain
)
if
cfg
.
EnablePprof
{
srv
.
log
.
Info
(
"pprof API enabled"
)
mux
.
Mount
(
"/debug"
,
middleware
.
Profiler
())
}
srv
.
srv
=
&
http.
Server
{
Addr
:
cfg
.
ListenAddr
,
Handler
:
mux
,
ReadTimeout
:
cfg
.
ReadTimeout
,
WriteTimeout
:
cfg
.
WriteTimeout
,
}
return
srv
,
nil
}
func
(
s
*
Server
)
httpLogger
(
next
http.
Handler
) http.
Handler
{
return
httplogger
.
LoggingMiddlewareSlog
(
s
.
log
,
next
)
}
func
(
s
*
Server
)
RunInBackground
() {
// metrics
if
s
.
cfg
.
MetricsAddr
!=
""
{
go
func
() {
s
.
log
.
With
(
"metricsAddress"
,
s
.
cfg
.
MetricsAddr
).
Info
(
"Starting metrics server"
)
err
:=
s
.
metricsSrv
.
ListenAndServe
()
if
err
!=
nil
&&
!
errors
.
Is
(
err
,
http
.
ErrServerClosed
) {
s
.
log
.
Error
(
"HTTP server failed"
,
"err"
,
err
)
}
}()
}
// api
go
func
() {
s
.
log
.
Info
(
"Starting HTTP server"
,
"listenAddress"
,
s
.
cfg
.
ListenAddr
)
if
err
:=
s
.
srv
.
ListenAndServe
();
err
!=
nil
&&
!
errors
.
Is
(
err
,
http
.
ErrServerClosed
) {
s
.
log
.
Error
(
"HTTP server failed"
,
"err"
,
err
)
}
}()
}
func
(
s
*
Server
)
Shutdown
() {
// api
ctx
,
cancel
:=
context
.
WithTimeout
(
context
.
Background
(),
s
.
cfg
.
GracefulShutdownDuration
)
defer
cancel
()
if
err
:=
s
.
srv
.
Shutdown
(
ctx
);
err
!=
nil
{
s
.
log
.
Error
(
"Graceful HTTP server shutdown failed"
,
"err"
,
err
)
}
else
{
s
.
log
.
Info
(
"HTTP server gracefully stopped"
)
}
// metrics
if
len
(
s
.
cfg
.
MetricsAddr
)
!=
0
{
ctx
,
cancel
:=
context
.
WithTimeout
(
context
.
Background
(),
s
.
cfg
.
GracefulShutdownDuration
)
defer
cancel
()
if
err
:=
s
.
metricsSrv
.
Shutdown
(
ctx
);
err
!=
nil
{
s
.
log
.
Error
(
"Graceful metrics server shutdown failed"
,
"err"
,
err
)
}
else
{
s
.
log
.
Info
(
"Metrics server gracefully stopped"
)
}
}
}
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