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Commit3fd1d32

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committed
fix: rewrite url to agent ip in single tailnet
This restores previous behavior of being able to cache connectionsacross agents in single tailnet.
1 parent8bc91b4 commit3fd1d32

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2 files changed

+36
-9
lines changed

2 files changed

+36
-9
lines changed

‎coderd/tailnet.go‎

Lines changed: 10 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -103,14 +103,7 @@ func NewServerTailnet(
103103
transport:tailnetTransport.Clone(),
104104
}
105105
tn.transport.DialContext=tn.dialContext
106-
107-
// Bugfix: for some reason all calls to tn.dialContext come from
108-
// "localhost", causing connections to be cached and requests to go to the
109-
// wrong workspaces. This disables keepalives for now until the root cause
110-
// can be found.
111-
tn.transport.MaxIdleConnsPerHost=-1
112-
tn.transport.DisableKeepAlives=true
113-
106+
tn.transport.MaxIdleConnsPerHost=10
114107
tn.transport.MaxIdleConns=0
115108
// We intentionally don't verify the certificate chain here.
116109
// The connection to the workspace is already established and most
@@ -312,7 +305,15 @@ type ServerTailnet struct {
312305
}
313306

314307
func (s*ServerTailnet)ReverseProxy(targetURL,dashboardURL*url.URL,agentID uuid.UUID) (_*httputil.ReverseProxy,releasefunc(),_error) {
315-
proxy:=httputil.NewSingleHostReverseProxy(targetURL)
308+
// Rewrite the targetURL's Host to point to the agent's IP. This is
309+
// necessary because due to TCP connection caching, each agent needs to be
310+
// addressed invidivually. Otherwise, all connections get dialed as
311+
// "localhost:port", causing connections to be shared across agents.
312+
tgt:=*targetURL
313+
_,port,_:=net.SplitHostPort(tgt.Host)
314+
tgt.Host=net.JoinHostPort(tailnet.IPFromUUID(agentID).String(),port)
315+
316+
proxy:=httputil.NewSingleHostReverseProxy(&tgt)
316317
proxy.ErrorHandler=func(w http.ResponseWriter,r*http.Request,errerror) {
317318
site.RenderStaticErrorPage(w,r, site.ErrorPageData{
318319
Status:http.StatusBadGateway,

‎coderd/tailnet_test.go‎

Lines changed: 26 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -95,6 +95,32 @@ func TestServerTailnet_ReverseProxy(t *testing.T) {
9595
assert.Equal(t,http.StatusOK,res.StatusCode)
9696
})
9797

98+
t.Run("HostRewrite",func(t*testing.T) {
99+
t.Parallel()
100+
101+
ctx,cancel:=context.WithTimeout(context.Background(),testutil.WaitLong)
102+
defercancel()
103+
104+
agentID,_,serverTailnet:=setupAgent(t,nil)
105+
106+
u,err:=url.Parse(fmt.Sprintf("http://127.0.0.1:%d",codersdk.WorkspaceAgentHTTPAPIServerPort))
107+
require.NoError(t,err)
108+
109+
rp,release,err:=serverTailnet.ReverseProxy(u,u,agentID)
110+
require.NoError(t,err)
111+
deferrelease()
112+
113+
req,err:=http.NewRequestWithContext(ctx,http.MethodGet,u.String(),nil)
114+
require.NoError(t,err)
115+
116+
// Ensure the reverse proxy director rewrites the url host to the agent's IP.
117+
rp.Director(req)
118+
assert.Equal(t,
119+
fmt.Sprintf("[%s]:%d",tailnet.IPFromUUID(agentID).String(),codersdk.WorkspaceAgentHTTPAPIServerPort),
120+
req.URL.Host,
121+
)
122+
})
123+
98124
t.Run("HTTPSProxy",func(t*testing.T) {
99125
t.Parallel()
100126

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