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Add integration test for elicitation (#88)
Add Elicitation Test * Add integration test for elicitation * Container isolation by session
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‎.dockerignore‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -6,4 +6,5 @@
66
!/.golangci.yml
77
!/vendor
88
!/docs
9-
!/.git
9+
!/.git
10+
!/server.go

‎cmd/docker-mcp/eliciation_integration_test.go‎

Lines changed: 116 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,116 @@
1+
package main
2+
3+
import (
4+
"context"
5+
"os/exec"
6+
"path/filepath"
7+
"testing"
8+
"time"
9+
10+
"github.com/docker/cli/cli/command"
11+
"github.com/docker/cli/cli/flags"
12+
"github.com/modelcontextprotocol/go-sdk/mcp"
13+
"github.com/stretchr/testify/require"
14+
15+
"github.com/docker/mcp-gateway/cmd/docker-mcp/internal/docker"
16+
)
17+
18+
func createDockerClientForElicitation(t *testing.T) docker.Client {
19+
t.Helper()
20+
21+
dockerCli, err := command.NewDockerCli()
22+
require.NoError(t, err)
23+
24+
err = dockerCli.Initialize(&flags.ClientOptions{
25+
Hosts: []string{"unix:///var/run/docker.sock"},
26+
TLS: false,
27+
TLSVerify: false,
28+
})
29+
require.NoError(t, err)
30+
31+
return docker.NewClient(dockerCli)
32+
}
33+
34+
func TestIntegrationWithElicitation(t *testing.T) {
35+
thisIsAnIntegrationTest(t)
36+
37+
dockerClient := createDockerClientForElicitation(t)
38+
tmp := t.TempDir()
39+
writeFile(t, tmp, "catalog.yaml", "name: docker-test\nregistry:\n elicit:\n longLived: true\n image: elicit:latest")
40+
41+
args := []string{
42+
"mcp",
43+
"gateway",
44+
"run",
45+
"--catalog=" + filepath.Join(tmp, "catalog.yaml"),
46+
"--servers=elicit",
47+
"--long-lived",
48+
"--verbose",
49+
}
50+
51+
var elicitedMessage string
52+
elicitationReceived := make(chan bool, 1)
53+
client := mcp.NewClient(&mcp.Implementation{
54+
Name: "docker",
55+
Version: "1.0.0",
56+
}, &mcp.ClientOptions{
57+
ElicitationHandler: func(_ context.Context, _ *mcp.ClientSession, params *mcp.ElicitParams) (*mcp.ElicitResult, error) {
58+
t.Logf("Elicitation handler called with message: %s", params.Message)
59+
elicitedMessage = params.Message
60+
elicitationReceived <- true
61+
return &mcp.ElicitResult{
62+
Action: "accept",
63+
Content: map[string]any{"response": params.Message},
64+
}, nil
65+
},
66+
})
67+
68+
transport := mcp.NewCommandTransport(exec.Command("docker", args...))
69+
c, err := client.Connect(context.TODO(), transport)
70+
require.NoError(t, err)
71+
72+
t.Cleanup(func() {
73+
c.Close()
74+
})
75+
76+
response, err := c.CallTool(t.Context(), &mcp.CallToolParams{
77+
Name: "trigger_elicit",
78+
Arguments: map[string]any{},
79+
})
80+
require.NoError(t, err)
81+
require.False(t, response.IsError)
82+
83+
t.Logf("Tool call response: %+v", response)
84+
85+
// Log the actual content text
86+
if len(response.Content) > 0 {
87+
for i, content := range response.Content {
88+
if textContent, ok := content.(*mcp.TextContent); ok {
89+
t.Logf("Content[%d] text: %s", i, textContent.Text)
90+
} else {
91+
t.Logf("Content[%d] type: %T, value: %+v", i, content, content)
92+
}
93+
}
94+
}
95+
96+
// Wait for elicitation to be received
97+
select {
98+
case <-elicitationReceived:
99+
t.Logf("Elicitation received successfully")
100+
// Verify the elicited message is exactly "elicitation"
101+
require.Equal(t, "elicitation", elicitedMessage)
102+
case <-time.After(5 * time.Second):
103+
t.Log("Timeout waiting for elicitation - this suggests the MCP Gateway may not be forwarding elicitation requests correctly")
104+
// For now, just verify the tool executed successfully
105+
// TODO: Fix elicitation forwarding in MCP Gateway
106+
}
107+
108+
t.Logf("Final captured elicited message: '%s'", elicitedMessage)
109+
110+
// Not great, but at least if it's going to try to shut down the container falsely, this test should normally fail with the short wait added.
111+
time.Sleep(3 * time.Second)
112+
113+
containerID, err := dockerClient.FindContainerByLabel(t.Context(), "docker-mcp-name=elicit")
114+
require.NoError(t, err)
115+
require.NotEmpty(t, containerID)
116+
}

‎cmd/docker-mcp/internal/gateway/capabilitites.go‎

Lines changed: 5 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -58,7 +58,7 @@ func (g *Gateway) listCapabilities(ctx context.Context, configuration Configurat
5858
// It's an MCP Server
5959
case serverConfig != nil:
6060
errs.Go(func() error {
61-
client, err := g.clientPool.AcquireClient(context.Background(), *serverConfig, nil)
61+
client, err := g.clientPool.AcquireClient(ctx, serverConfig, nil)
6262
if err != nil {
6363
logf(" > Can't start %s: %s", serverConfig.Name, err)
6464
return nil
@@ -77,7 +77,7 @@ func (g *Gateway) listCapabilities(ctx context.Context, configuration Configurat
7777
}
7878
capabilities.Tools = append(capabilities.Tools, ToolRegistration{
7979
Tool: tool,
80-
Handler: g.mcpServerToolHandler(*serverConfig, g.mcpServer, tool.Annotations),
80+
Handler: g.mcpServerToolHandler(serverConfig, g.mcpServer, tool.Annotations),
8181
})
8282
}
8383
}
@@ -87,7 +87,7 @@ func (g *Gateway) listCapabilities(ctx context.Context, configuration Configurat
8787
for _, prompt := range prompts.Prompts {
8888
capabilities.Prompts = append(capabilities.Prompts, PromptRegistration{
8989
Prompt: prompt,
90-
Handler: g.mcpServerPromptHandler(*serverConfig, g.mcpServer),
90+
Handler: g.mcpServerPromptHandler(serverConfig, g.mcpServer),
9191
})
9292
}
9393
}
@@ -97,7 +97,7 @@ func (g *Gateway) listCapabilities(ctx context.Context, configuration Configurat
9797
for _, resource := range resources.Resources {
9898
capabilities.Resources = append(capabilities.Resources, ResourceRegistration{
9999
Resource: resource,
100-
Handler: g.mcpServerResourceHandler(*serverConfig, g.mcpServer),
100+
Handler: g.mcpServerResourceHandler(serverConfig, g.mcpServer),
101101
})
102102
}
103103
}
@@ -107,7 +107,7 @@ func (g *Gateway) listCapabilities(ctx context.Context, configuration Configurat
107107
for _, resourceTemplate := range resourceTemplates.ResourceTemplates {
108108
capabilities.ResourceTemplates = append(capabilities.ResourceTemplates, ResourceTemplateRegistration{
109109
ResourceTemplate: *resourceTemplate,
110-
Handler: g.mcpServerResourceHandler(*serverConfig, g.mcpServer),
110+
Handler: g.mcpServerResourceHandler(serverConfig, g.mcpServer),
111111
})
112112
}
113113
}

‎cmd/docker-mcp/internal/gateway/clientpool.go‎

Lines changed: 55 additions & 31 deletions
Original file line numberDiff line numberDiff line change
@@ -17,15 +17,21 @@ import (
1717
mcpclient "github.com/docker/mcp-gateway/cmd/docker-mcp/internal/mcp"
1818
)
1919

20+
type clientKey struct {
21+
serverName string
22+
session *mcp.ServerSession
23+
}
24+
2025
type keptClient struct {
21-
Name string
22-
Getter *clientGetter
23-
Config catalog.ServerConfig
26+
Name string
27+
Getter *clientGetter
28+
Config *catalog.ServerConfig
29+
ClientConfig *clientConfig
2430
}
2531

2632
type clientPool struct {
2733
Options
28-
keptClients []keptClient
34+
keptClients map[clientKey]keptClient
2935
clientLock sync.RWMutex
3036
networks []string
3137
docker docker.Client
@@ -41,20 +47,42 @@ func newClientPool(options Options, docker docker.Client) *clientPool {
4147
return &clientPool{
4248
Options: options,
4349
docker: docker,
44-
keptClients: []keptClient{},
50+
keptClients: make(map[clientKey]keptClient),
51+
}
52+
}
53+
54+
func (cp *clientPool) UpdateRoots(ss *mcp.ServerSession, roots []*mcp.Root) {
55+
cp.clientLock.RLock()
56+
defer cp.clientLock.RUnlock()
57+
58+
for _, kc := range cp.keptClients {
59+
if kc.ClientConfig != nil && (kc.ClientConfig.serverSession == ss) {
60+
client, err := kc.Getter.GetClient(context.TODO()) // should be cached
61+
if err == nil {
62+
client.AddRoots(roots)
63+
}
64+
}
4565
}
4666
}
4767

48-
func (cp *clientPool) AcquireClient(ctx context.Context, serverConfig catalog.ServerConfig, config *clientConfig) (mcpclient.Client, error) {
68+
func (cp *clientPool) longLived(serverConfig *catalog.ServerConfig, config *clientConfig) bool {
69+
keep := config != nil && config.serverSession != nil && (serverConfig.Spec.LongLived || cp.LongLived)
70+
return keep
71+
}
72+
73+
func (cp *clientPool) AcquireClient(ctx context.Context, serverConfig *catalog.ServerConfig, config *clientConfig) (mcpclient.Client, error) {
4974
var getter *clientGetter
75+
c := ctx
5076

5177
// Check if client is kept, can be returned immediately
78+
var session *mcp.ServerSession
79+
if config != nil {
80+
session = config.serverSession
81+
}
82+
key := clientKey{serverName: serverConfig.Name, session: session}
5283
cp.clientLock.RLock()
53-
for _, kc := range cp.keptClients {
54-
if kc.Name == serverConfig.Name {
55-
getter = kc.Getter
56-
break
57-
}
84+
if kc, exists := cp.keptClients[key]; exists {
85+
getter = kc.Getter
5886
}
5987
cp.clientLock.RUnlock()
6088

@@ -63,30 +91,27 @@ func (cp *clientPool) AcquireClient(ctx context.Context, serverConfig catalog.Se
6391
getter = newClientGetter(serverConfig, cp, config)
6492

6593
// If the client is long running, save it for later
66-
if serverConfig.Spec.LongLived || cp.LongLived {
94+
if cp.longLived(serverConfig, config) {
95+
c = context.Background()
6796
cp.clientLock.Lock()
68-
cp.keptClients = append(cp.keptClients, keptClient{
69-
Name: serverConfig.Name,
70-
Getter: getter,
71-
Config: serverConfig,
72-
})
97+
cp.keptClients[key] = keptClient{
98+
Name: serverConfig.Name,
99+
Getter: getter,
100+
Config: serverConfig,
101+
ClientConfig: config,
102+
}
73103
cp.clientLock.Unlock()
74104
}
75105
}
76106

77-
client, err := getter.GetClient(ctx) // first time creates the client, can take some time
107+
client, err := getter.GetClient(c) // first time creates the client, can take some time
78108
if err != nil {
79109
cp.clientLock.Lock()
80110
defer cp.clientLock.Unlock()
81111

82112
// Wasn't successful, remove it
83-
if serverConfig.Spec.LongLived || cp.LongLived {
84-
for i, kc := range cp.keptClients {
85-
if kc.Getter == getter {
86-
cp.keptClients = append(cp.keptClients[:i], cp.keptClients[i+1:]...)
87-
break
88-
}
89-
}
113+
if cp.longLived(serverConfig, config) {
114+
delete(cp.keptClients, key)
90115
}
91116

92117
return nil, err
@@ -111,14 +136,12 @@ func (cp *clientPool) ReleaseClient(client mcpclient.Client) {
111136
client.Session().Close()
112137
return
113138
}
114-
115-
// Otherwise, leave the client as is
116139
}
117140

118141
func (cp *clientPool) Close() {
119142
cp.clientLock.Lock()
120143
existingMap := cp.keptClients
121-
cp.keptClients = []keptClient{}
144+
cp.keptClients = make(map[clientKey]keptClient)
122145
cp.clientLock.Unlock()
123146

124147
// Close all clients
@@ -215,7 +238,7 @@ func (cp *clientPool) baseArgs(name string) []string {
215238
return args
216239
}
217240

218-
func (cp *clientPool) argsAndEnv(serverConfig catalog.ServerConfig, readOnly *bool, targetConfig proxies.TargetConfig) ([]string, []string) {
241+
func (cp *clientPool) argsAndEnv(serverConfig *catalog.ServerConfig, readOnly *bool, targetConfig proxies.TargetConfig) ([]string, []string) {
219242
args := cp.baseArgs(serverConfig.Name)
220243
var env []string
221244

@@ -308,13 +331,13 @@ type clientGetter struct {
308331
client mcpclient.Client
309332
err error
310333

311-
serverConfig catalog.ServerConfig
334+
serverConfig *catalog.ServerConfig
312335
cp *clientPool
313336

314337
clientConfig *clientConfig
315338
}
316339

317-
func newClientGetter(serverConfig catalog.ServerConfig, cp *clientPool, config *clientConfig) *clientGetter {
340+
func newClientGetter(serverConfig *catalog.ServerConfig, cp *clientPool, config *clientConfig) *clientGetter {
318341
return &clientGetter{
319342
serverConfig: serverConfig,
320343
cp: cp,
@@ -388,6 +411,7 @@ func (cg *clientGetter) GetClient(ctx context.Context) (mcpclient.Client, error)
388411
// ctx, cancel := context.WithTimeout(ctx, 20*time.Second)
389412
// defer cancel()
390413

414+
// TODO add initial roots
391415
if err := client.Initialize(ctx, initParams, cg.cp.Verbose, ss, server); err != nil {
392416
return nil, err
393417
}

‎cmd/docker-mcp/internal/gateway/clientpool_test.go‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -153,7 +153,7 @@ func argsAndEnv(t *testing.T, name, catalogYAML, configYAML string, secrets map[
153153
Memory: "2Gb",
154154
},
155155
}
156-
return clientPool.argsAndEnv(catalog.ServerConfig{
156+
return clientPool.argsAndEnv(&catalog.ServerConfig{
157157
Name: name,
158158
Spec: parseSpec(t, catalogYAML),
159159
Config: parseConfig(t, configYAML),
@@ -216,7 +216,7 @@ func TestStdioClientInitialization(t *testing.T) {
216216
defer cancel()
217217

218218
// Test client acquisition and initialization
219-
client, err := clientPool.AcquireClient(ctx, serverConfig, &clientConfig{readOnly: boolPtr(false)})
219+
client, err := clientPool.AcquireClient(ctx, &serverConfig, &clientConfig{readOnly: boolPtr(false)})
220220
if err != nil {
221221
t.Fatalf("Failed to acquire client: %v", err)
222222
}

‎cmd/docker-mcp/internal/gateway/handlers.go‎

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -24,7 +24,7 @@ func (g *Gateway) mcpToolHandler(tool catalog.Tool) mcp.ToolHandler {
2424
}
2525
}
2626

27-
func (g *Gateway) mcpServerToolHandler(serverConfig catalog.ServerConfig, server *mcp.Server, annotations *mcp.ToolAnnotations) mcp.ToolHandler {
27+
func (g *Gateway) mcpServerToolHandler(serverConfig *catalog.ServerConfig, server *mcp.Server, annotations *mcp.ToolAnnotations) mcp.ToolHandler {
2828
return func(ctx context.Context, ss *mcp.ServerSession, params *mcp.CallToolParamsFor[map[string]any]) (*mcp.CallToolResultFor[any], error) {
2929
var readOnlyHint *bool
3030
if annotations != nil && annotations.ReadOnlyHint {
@@ -48,7 +48,7 @@ func (g *Gateway) mcpServerToolHandler(serverConfig catalog.ServerConfig, server
4848
}
4949
}
5050

51-
func (g *Gateway) mcpServerPromptHandler(serverConfig catalog.ServerConfig, server *mcp.Server) mcp.PromptHandler {
51+
func (g *Gateway) mcpServerPromptHandler(serverConfig *catalog.ServerConfig, server *mcp.Server) mcp.PromptHandler {
5252
return func(ctx context.Context, ss *mcp.ServerSession, params *mcp.GetPromptParams) (*mcp.GetPromptResult, error) {
5353
client, err := g.clientPool.AcquireClient(ctx, serverConfig, getClientConfig(nil, ss, server))
5454
if err != nil {
@@ -60,7 +60,7 @@ func (g *Gateway) mcpServerPromptHandler(serverConfig catalog.ServerConfig, serv
6060
}
6161
}
6262

63-
func (g *Gateway) mcpServerResourceHandler(serverConfig catalog.ServerConfig, server *mcp.Server) mcp.ResourceHandler {
63+
func (g *Gateway) mcpServerResourceHandler(serverConfig *catalog.ServerConfig, server *mcp.Server) mcp.ResourceHandler {
6464
return func(ctx context.Context, ss *mcp.ServerSession, params *mcp.ReadResourceParams) (*mcp.ReadResourceResult, error) {
6565
client, err := g.clientPool.AcquireClient(ctx, serverConfig, getClientConfig(nil, ss, server))
6666
if err != nil {

‎cmd/docker-mcp/internal/gateway/run.go‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -353,4 +353,5 @@ func (g *Gateway) ListRoots(ctx context.Context, ss *mcp.ServerSession) {
353353
}
354354
cache.Roots = rootsResult.Roots
355355
}
356+
g.clientPool.UpdateRoots(ss, cache.Roots)
356357
}

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