feat: implement AI client with OpenAI integration

- Add plugin/ai/client.go with OpenAI API wrapper
- Add comprehensive test suite for AI client functionality

Signed-off-by: Chao Liu <chaoliu719@gmail.com>
This commit is contained in:
Chao Liu 2025-08-16 13:34:01 +08:00 committed by ChaoLiu
parent d8bddf3769
commit 070598cbd3
2 changed files with 677 additions and 0 deletions

253
plugin/ai/client.go Normal file
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package ai
import (
"context"
"errors"
"fmt"
"os"
"strconv"
"strings"
"time"
"github.com/openai/openai-go/v2"
"github.com/openai/openai-go/v2/option"
storepb "github.com/usememos/memos/proto/gen/store"
)
// Common AI errors
var (
ErrConfigIncomplete = errors.New("AI configuration incomplete - missing BaseURL, APIKey, or Model")
ErrEmptyRequest = errors.New("chat request cannot be empty")
ErrInvalidMessage = errors.New("message role must be 'system', 'user', or 'assistant'")
ErrEmptyContent = errors.New("message content cannot be empty")
ErrAPICallFailed = errors.New("AI API call failed")
ErrEmptyResponse = errors.New("received empty response from AI")
ErrNoChoices = errors.New("AI returned no response choices")
)
// Config holds AI configuration
type Config struct {
Enabled bool
BaseURL string
APIKey string
Model string
TimeoutSeconds int
}
// LoadConfigFromEnv loads AI configuration from environment variables
func LoadConfigFromEnv() *Config {
timeoutSeconds := 10 // default timeout
if timeoutStr := os.Getenv("AI_TIMEOUT_SECONDS"); timeoutStr != "" {
if timeout, err := strconv.Atoi(timeoutStr); err == nil && timeout > 0 {
timeoutSeconds = timeout
}
}
config := &Config{
BaseURL: os.Getenv("AI_BASE_URL"),
APIKey: os.Getenv("AI_API_KEY"),
Model: os.Getenv("AI_MODEL"),
TimeoutSeconds: timeoutSeconds,
}
// Enable AI if all required fields are provided
config.Enabled = config.BaseURL != "" && config.APIKey != "" && config.Model != ""
return config
}
// LoadConfigFromDatabase loads AI configuration from database settings
func LoadConfigFromDatabase(aiSetting *storepb.WorkspaceAISetting) *Config {
if aiSetting == nil {
return &Config{Enabled: false}
}
timeoutSeconds := int(aiSetting.TimeoutSeconds)
if timeoutSeconds <= 0 {
timeoutSeconds = 10 // default timeout
}
return &Config{
Enabled: aiSetting.EnableAi,
BaseURL: aiSetting.BaseUrl,
APIKey: aiSetting.ApiKey,
Model: aiSetting.Model,
TimeoutSeconds: timeoutSeconds,
}
}
// MergeWithEnv merges database config with environment variables
// Environment variables take precedence if they are set
func (c *Config) MergeWithEnv() *Config {
envConfig := LoadConfigFromEnv()
// Start with current config
merged := &Config{
Enabled: c.Enabled,
BaseURL: c.BaseURL,
APIKey: c.APIKey,
Model: c.Model,
TimeoutSeconds: c.TimeoutSeconds,
}
// Override with env vars if they are set
if envConfig.BaseURL != "" {
merged.BaseURL = envConfig.BaseURL
}
if envConfig.APIKey != "" {
merged.APIKey = envConfig.APIKey
}
if envConfig.Model != "" {
merged.Model = envConfig.Model
}
if os.Getenv("AI_TIMEOUT_SECONDS") != "" {
merged.TimeoutSeconds = envConfig.TimeoutSeconds
}
// Enable if all required fields are present
merged.Enabled = merged.BaseURL != "" && merged.APIKey != "" && merged.Model != ""
return merged
}
// IsConfigured returns true if AI is properly configured
func (c *Config) IsConfigured() bool {
return c.Enabled && c.BaseURL != "" && c.APIKey != "" && c.Model != ""
}
// Client wraps OpenAI client with convenience methods
type Client struct {
client openai.Client
config *Config
}
// NewClient creates a new AI client
func NewClient(config *Config) (*Client, error) {
if config == nil {
return nil, fmt.Errorf("config cannot be nil")
}
if !config.IsConfigured() {
return nil, ErrConfigIncomplete
}
var client openai.Client
if config.BaseURL != "" && config.BaseURL != "https://api.openai.com/v1" {
client = openai.NewClient(
option.WithAPIKey(config.APIKey),
option.WithBaseURL(config.BaseURL),
)
} else {
client = openai.NewClient(
option.WithAPIKey(config.APIKey),
)
}
return &Client{
client: client,
config: config,
}, nil
}
// ChatRequest represents a chat completion request
type ChatRequest struct {
Messages []Message
MaxTokens int
Temperature float64
Timeout time.Duration
}
// Message represents a chat message
type Message struct {
Role string // "system", "user", "assistant"
Content string
}
// ChatResponse represents a chat completion response
type ChatResponse struct {
Content string
}
// Chat performs a chat completion
func (c *Client) Chat(ctx context.Context, req *ChatRequest) (*ChatResponse, error) {
if req == nil {
return nil, ErrEmptyRequest
}
if len(req.Messages) == 0 {
return nil, ErrEmptyRequest
}
// Validate messages
for i, msg := range req.Messages {
if msg.Role != "system" && msg.Role != "user" && msg.Role != "assistant" {
return nil, fmt.Errorf("message %d: %w", i, ErrInvalidMessage)
}
if strings.TrimSpace(msg.Content) == "" {
return nil, fmt.Errorf("message %d: %w", i, ErrEmptyContent)
}
}
// Set defaults
if req.MaxTokens == 0 {
req.MaxTokens = 8192
}
if req.Temperature == 0 {
req.Temperature = 0.3
}
if req.Timeout == 0 {
// Use timeout from config if available
if c.config.TimeoutSeconds > 0 {
req.Timeout = time.Duration(c.config.TimeoutSeconds) * time.Second
} else {
req.Timeout = 10 * time.Second
}
}
model := c.config.Model
if model == "" {
model = "gpt-4o" // Default model
}
// Convert messages
messages := make([]openai.ChatCompletionMessageParamUnion, 0, len(req.Messages))
for _, msg := range req.Messages {
switch msg.Role {
case "system":
messages = append(messages, openai.SystemMessage(msg.Content))
case "user":
messages = append(messages, openai.UserMessage(msg.Content))
case "assistant":
messages = append(messages, openai.AssistantMessage(msg.Content))
}
}
// Create timeout context
timeoutCtx, cancel := context.WithTimeout(ctx, req.Timeout)
defer cancel()
// Make API call
completion, err := c.client.Chat.Completions.New(timeoutCtx, openai.ChatCompletionNewParams{
Messages: messages,
Model: model,
MaxTokens: openai.Int(int64(req.MaxTokens)),
Temperature: openai.Float(req.Temperature),
})
if err != nil {
return nil, fmt.Errorf("%w: %v", ErrAPICallFailed, err)
}
if len(completion.Choices) == 0 {
return nil, ErrNoChoices
}
response := strings.TrimSpace(completion.Choices[0].Message.Content)
if response == "" {
return nil, ErrEmptyResponse
}
return &ChatResponse{
Content: response,
}, nil
}

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plugin/ai/client_test.go Normal file
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package ai
import (
"context"
"os"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestLoadConfigFromEnv(t *testing.T) {
tests := []struct {
name string
envVars map[string]string
expected *Config
}{
{
name: "all environment variables set",
envVars: map[string]string{
"AI_BASE_URL": "https://api.openai.com/v1",
"AI_API_KEY": "sk-test123",
"AI_MODEL": "gpt-4o",
},
expected: &Config{
BaseURL: "https://api.openai.com/v1",
APIKey: "sk-test123",
Model: "gpt-4o",
},
},
{
name: "no environment variables set",
envVars: map[string]string{},
expected: &Config{
BaseURL: "",
APIKey: "",
Model: "",
},
},
{
name: "partial environment variables set",
envVars: map[string]string{
"AI_BASE_URL": "https://custom.api.com/v1",
"AI_API_KEY": "sk-custom123",
},
expected: &Config{
BaseURL: "https://custom.api.com/v1",
APIKey: "sk-custom123",
Model: "",
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
// Save original environment variables
origBaseURL := os.Getenv("AI_BASE_URL")
origAPIKey := os.Getenv("AI_API_KEY")
origModel := os.Getenv("AI_MODEL")
// Clear existing environment variables
os.Unsetenv("AI_BASE_URL")
os.Unsetenv("AI_API_KEY")
os.Unsetenv("AI_MODEL")
// Set test environment variables
for key, value := range tt.envVars {
os.Setenv(key, value)
}
// Test configuration loading
config := LoadConfigFromEnv()
assert.Equal(t, tt.expected, config)
// Restore original environment variables
os.Unsetenv("AI_BASE_URL")
os.Unsetenv("AI_API_KEY")
os.Unsetenv("AI_MODEL")
if origBaseURL != "" {
os.Setenv("AI_BASE_URL", origBaseURL)
}
if origAPIKey != "" {
os.Setenv("AI_API_KEY", origAPIKey)
}
if origModel != "" {
os.Setenv("AI_MODEL", origModel)
}
})
}
}
func TestConfig_IsConfigured(t *testing.T) {
tests := []struct {
name string
config *Config
expected bool
}{
{
name: "fully configured",
config: &Config{
BaseURL: "https://api.openai.com/v1",
APIKey: "sk-test123",
Model: "gpt-4o",
},
expected: true,
},
{
name: "missing base URL",
config: &Config{
BaseURL: "",
APIKey: "sk-test123",
Model: "gpt-4o",
},
expected: false,
},
{
name: "missing API key",
config: &Config{
BaseURL: "https://api.openai.com/v1",
APIKey: "",
Model: "gpt-4o",
},
expected: false,
},
{
name: "missing model",
config: &Config{
BaseURL: "https://api.openai.com/v1",
APIKey: "sk-test123",
Model: "",
},
expected: false,
},
{
name: "all fields empty",
config: &Config{
BaseURL: "",
APIKey: "",
Model: "",
},
expected: false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
result := tt.config.IsConfigured()
assert.Equal(t, tt.expected, result)
})
}
}
func TestNewClient(t *testing.T) {
tests := []struct {
name string
config *Config
expectErr bool
}{
{
name: "standard OpenAI configuration",
config: &Config{
BaseURL: "https://api.openai.com/v1",
APIKey: "sk-test123",
Model: "gpt-4o",
},
expectErr: false,
},
{
name: "custom endpoint configuration",
config: &Config{
BaseURL: "https://custom.api.com/v1",
APIKey: "sk-custom123",
Model: "gpt-3.5-turbo",
},
expectErr: false,
},
{
name: "incomplete configuration",
config: &Config{
BaseURL: "",
APIKey: "sk-test123",
Model: "gpt-4o",
},
expectErr: true,
},
{
name: "nil configuration",
config: nil,
expectErr: true,
},
{
name: "missing API key",
config: &Config{
BaseURL: "https://api.openai.com/v1",
APIKey: "",
Model: "gpt-4o",
},
expectErr: true,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
client, err := NewClient(tt.config)
if tt.expectErr {
assert.Error(t, err)
assert.Nil(t, client)
} else {
require.NoError(t, err)
require.NotNil(t, client)
assert.Equal(t, tt.config, client.config)
assert.NotNil(t, client.client)
}
})
}
}
func TestClient_Chat_RequestDefaults(t *testing.T) {
// This test verifies that default values are properly set
config := &Config{
BaseURL: "https://api.openai.com/v1",
APIKey: "sk-test123",
Model: "gpt-4o",
}
client, err := NewClient(config)
require.NoError(t, err)
// Test with minimal request
req := &ChatRequest{
Messages: []Message{
{Role: "user", Content: "Hello"},
},
}
// We can't actually call the API in tests without mocking,
// but we can verify the client was created successfully
assert.NotNil(t, client)
assert.Equal(t, config, client.config)
// Verify default values would be set
assert.Equal(t, 0, req.MaxTokens) // Should become 8192
assert.Equal(t, float64(0), req.Temperature) // Should become 0.3
assert.Equal(t, time.Duration(0), req.Timeout) // Should become 10s
}
func TestMessage_Roles(t *testing.T) {
tests := []struct {
name string
role string
valid bool
}{
{"system role", "system", true},
{"user role", "user", true},
{"assistant role", "assistant", true},
{"invalid role", "invalid", false},
{"empty role", "", false},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
msg := Message{
Role: tt.role,
Content: "test content",
}
// Valid roles are those that would be handled in the switch statement
validRoles := map[string]bool{
"system": true,
"user": true,
"assistant": true,
}
assert.Equal(t, tt.valid, validRoles[msg.Role])
})
}
}
// Integration test helper - only runs with proper environment variables
func TestClient_Chat_Integration(t *testing.T) {
// Skip if not in integration test mode
if os.Getenv("AI_INTEGRATION_TEST") != "true" {
t.Skip("Skipping integration test - set AI_INTEGRATION_TEST=true to run")
}
config := LoadConfigFromEnv()
if !config.IsConfigured() {
t.Skip("AI not configured - set AI_BASE_URL, AI_API_KEY, AI_MODEL environment variables")
}
client, err := NewClient(config)
require.NoError(t, err)
ctx := context.Background()
req := &ChatRequest{
Messages: []Message{
{Role: "user", Content: "Say 'Hello, World!' in exactly those words."},
},
MaxTokens: 50,
Temperature: 0.1,
Timeout: 30 * time.Second,
}
resp, err := client.Chat(ctx, req)
require.NoError(t, err)
require.NotNil(t, resp)
assert.NotEmpty(t, resp.Content)
t.Logf("AI Response: %s", resp.Content)
}
func TestClient_Chat_Validation(t *testing.T) {
config := &Config{
BaseURL: "https://api.openai.com/v1",
APIKey: "sk-test123",
Model: "gpt-4o",
}
client, err := NewClient(config)
require.NoError(t, err)
ctx := context.Background()
tests := []struct {
name string
request *ChatRequest
expectErr error
}{
{
name: "nil request",
request: nil,
expectErr: ErrEmptyRequest,
},
{
name: "empty messages",
request: &ChatRequest{
Messages: []Message{},
},
expectErr: ErrEmptyRequest,
},
{
name: "invalid message role",
request: &ChatRequest{
Messages: []Message{
{Role: "invalid", Content: "Hello"},
},
},
expectErr: ErrInvalidMessage,
},
{
name: "empty message content",
request: &ChatRequest{
Messages: []Message{
{Role: "user", Content: ""},
},
},
expectErr: ErrEmptyContent,
},
{
name: "whitespace-only message content",
request: &ChatRequest{
Messages: []Message{
{Role: "user", Content: " \n\t "},
},
},
expectErr: ErrEmptyContent,
},
{
name: "valid request",
request: &ChatRequest{
Messages: []Message{
{Role: "user", Content: "Hello"},
},
},
expectErr: nil, // This will fail with API call error in tests, but validation should pass
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
_, err := client.Chat(ctx, tt.request)
if tt.expectErr != nil {
assert.Error(t, err)
assert.ErrorIs(t, err, tt.expectErr)
} else {
// For the valid request case, we expect an API call error since we don't have real credentials
// but the validation should pass, so we just check that it's not a validation error
if err != nil {
assert.NotErrorIs(t, err, ErrEmptyRequest)
assert.NotErrorIs(t, err, ErrInvalidMessage)
assert.NotErrorIs(t, err, ErrEmptyContent)
}
}
})
}
}
func TestClient_Chat_ErrorTypes(t *testing.T) {
config := &Config{
BaseURL: "https://api.openai.com/v1",
APIKey: "sk-test123",
Model: "gpt-4o",
}
client, err := NewClient(config)
require.NoError(t, err)
ctx := context.Background()
// Test that we can identify specific error types
t.Run("can check for specific errors", func(t *testing.T) {
_, err := client.Chat(ctx, nil)
assert.ErrorIs(t, err, ErrEmptyRequest)
_, err = client.Chat(ctx, &ChatRequest{
Messages: []Message{
{Role: "invalid", Content: "test"},
},
})
assert.ErrorIs(t, err, ErrInvalidMessage)
})
}