Add ai search plugin (#1804)

plugins/wasm-go/extensions/ai-search/engine/arxiv/arxiv.go

@@ -0,0 +1,134 @@
+package arxiv
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/alibaba/higress/plugins/wasm-go/pkg/wrapper"
+	"github.com/antchfx/xmlquery"
+	"github.com/tidwall/gjson"
+
+	"github.com/alibaba/higress/plugins/wasm-go/extensions/ai-search/engine"
+)
+
+type ArxivSearch struct {
+	optionArgs         map[string]string
+	start              int
+	count              int
+	timeoutMillisecond uint32
+	client             wrapper.HttpClient
+	arxivCategory      string
+}
+
+func NewArxivSearch(config *gjson.Result) (*ArxivSearch, error) {
+	engine := &ArxivSearch{}
+	serviceName := config.Get("serviceName").String()
+	if serviceName == "" {
+		return nil, errors.New("serviceName not found")
+	}
+	servicePort := config.Get("servicePort").Int()
+	if servicePort == 0 {
+		return nil, errors.New("servicePort not found")
+	}
+	engine.client = wrapper.NewClusterClient(wrapper.FQDNCluster{
+		FQDN: serviceName,
+		Port: servicePort,
+	})
+	engine.start = int(config.Get("start").Uint())
+	engine.count = int(config.Get("count").Uint())
+	if engine.count == 0 {
+		engine.count = 10
+	}
+	engine.timeoutMillisecond = uint32(config.Get("timeoutMillisecond").Uint())
+	if engine.timeoutMillisecond == 0 {
+		engine.timeoutMillisecond = 5000
+	}
+	engine.optionArgs = map[string]string{}
+	for key, value := range config.Get("optionArgs").Map() {
+		valStr := value.String()
+		if valStr != "" {
+			engine.optionArgs[key] = value.String()
+		}
+	}
+	engine.arxivCategory = config.Get("arxivCategory").String()
+	return engine, nil
+}
+
+func (a ArxivSearch) NeedExectue(ctx engine.SearchContext) bool {
+	return ctx.EngineType == "arxiv"
+}
+
+func (a ArxivSearch) Client() wrapper.HttpClient {
+	return a.client
+}
+
+func (a ArxivSearch) CallArgs(ctx engine.SearchContext) engine.CallArgs {
+	var searchQueryItems []string
+	for _, q := range ctx.Querys {
+		searchQueryItems = append(searchQueryItems, fmt.Sprintf("all:%s", url.QueryEscape(q)))
+	}
+	searchQuery := strings.Join(searchQueryItems, "+AND+")
+	category := ctx.ArxivCategory
+	if category == "" {
+		category = a.arxivCategory
+	}
+	if category != "" {
+		searchQuery = fmt.Sprintf("%s+AND+cat:%s", searchQuery, category)
+	}
+	queryUrl := fmt.Sprintf("https://export.arxiv.org/api/query?search_query=%s&max_results=%d&start=%d",
+		searchQuery, a.count, a.start)
+	var extraArgs []string
+	for key, value := range a.optionArgs {
+		extraArgs = append(extraArgs, fmt.Sprintf("%s=%s", key, url.QueryEscape(value)))
+	}
+	if len(extraArgs) > 0 {
+		queryUrl = fmt.Sprintf("%s&%s", queryUrl, strings.Join(extraArgs, "&"))
+	}
+	return engine.CallArgs{
+		Method:             http.MethodGet,
+		Url:                queryUrl,
+		Headers:            [][2]string{{"Accept", "application/atom+xml"}},
+		TimeoutMillisecond: a.timeoutMillisecond,
+	}
+}
+
+func (a ArxivSearch) ParseResult(ctx engine.SearchContext, response []byte) []engine.SearchResult {
+	var results []engine.SearchResult
+	doc, err := xmlquery.Parse(bytes.NewReader(response))
+	if err != nil {
+		return results
+	}
+
+	entries := xmlquery.Find(doc, "//entry")
+	for _, entry := range entries {
+		title := entry.SelectElement("title").InnerText()
+		link := ""
+		for _, l := range entry.SelectElements("link") {
+			if l.SelectAttr("rel") == "alternate" && l.SelectAttr("type") == "text/html" {
+				link = l.SelectAttr("href")
+				break
+			}
+		}
+		summary := entry.SelectElement("summary").InnerText()
+		publishTime := entry.SelectElement("published").InnerText()
+		authors := entry.SelectElements("author")
+		var authorNames []string
+		for _, author := range authors {
+			authorNames = append(authorNames, author.SelectElement("name").InnerText())
+		}
+		content := fmt.Sprintf("%s\nAuthors: %s\nPublication time: %s", summary, strings.Join(authorNames, ", "), publishTime)
+		result := engine.SearchResult{
+			Title:   title,
+			Link:    link,
+			Content: content,
+		}
+		if result.Valid() {
+			results = append(results, result)
+		}
+	}
+	return results
+}