ragserver: start adding new example of a RAG server in Go
Change-Id: I256449c9cd97ef53251e326d943858c237b4ea16
Reviewed-on: https://go-review.googlesource.com/c/example/+/608055
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Eli Bendersky <eliben@google.com>
TryBot-Bypass: Eli Bendersky <eliben@google.com>
Reviewed-by: Eli Bendersky <eliben@google.com>
diff --git a/ragserver/README.md b/ragserver/README.md
new file mode 100644
index 0000000..2ccfdc0
--- /dev/null
+++ b/ragserver/README.md
@@ -0,0 +1,54 @@
+# ragserver
+
+*RAG stands for Retrieval Augmented Generation*
+
+Demos of implementing a "RAG Server" in Go, using [Google
+AI](https://ai.google.dev/) for embeddings and language models and
+[Weaviate](https://weaviate.io/) as a vector database.
+
+
+## How it works
+
+The server we're developing is a standard Go HTTP server, listening on a local
+port. See the next section for the request schema for this server. It supports
+adding new documents to its context, and getting queries that would use this
+context.
+
+Weaviate has the be installed locally; the easiest way to do so is by using
+`docker-compose` as described in the Usage section.
+
+## Server request schema
+
+```
+/add/: POST {"documents": [{"text": "..."}, {"text": "..."}, ...]}
+ response: OK (no body)
+
+/query/: GET {"content": "..."}
+ response: model response as a string
+```
+
+## Server variants
+
+* `ragserver`: uses the Google AI Go SDK directly for LLM calls and embeddings,
+ and the Weaviate Go client library directly for interacting with Weaviate.
+
+## Usage
+
+* In terminal window 1, `cd tests` and run `docker-compose up`;
+ This will start the weaviate service in the foreground.
+* In terminal window 2, run `GEMINI_API_KEY=... go run .` in the tested
+ `ragserver` directory.
+* In terminal window 3, we can now run scripts to clear/populate the
+ weaviate DB and interact with `ragserver`. The following instructions are
+ for terminal window 3.
+
+Run `cd tests`; then we can clear out the weaviate DB with
+`./weaviate-delete-objects.sh`. To add documents to the DB through `ragserver`,
+run `./add-documents.sh`. For a sample query, run `./query.sh`
+Adjust the contents of these scripts as needed.
+
+## Environment variables
+
+* `SERVERPORT`: the port this server is listening on (default 9020)
+* `WVPORT`: the port Weaviate is listening on (default 9035)
+* `GEMINI_API_KEY`: API key for the Gemini service at https://ai.google.dev
diff --git a/ragserver/ragserver/go.mod b/ragserver/ragserver/go.mod
new file mode 100644
index 0000000..c5ccbee
--- /dev/null
+++ b/ragserver/ragserver/go.mod
@@ -0,0 +1,63 @@
+module golang.org/x/example/ragserver/ragserver
+
+go 1.23.0
+
+require (
+ github.com/google/generative-ai-go v0.17.0
+ github.com/weaviate/weaviate v1.26.1
+ github.com/weaviate/weaviate-go-client/v4 v4.15.1
+ google.golang.org/api v0.194.0
+)
+
+require (
+ cloud.google.com/go v0.115.1 // indirect
+ cloud.google.com/go/ai v0.8.0 // indirect
+ cloud.google.com/go/auth v0.9.1 // indirect
+ cloud.google.com/go/auth/oauth2adapt v0.2.4 // indirect
+ cloud.google.com/go/compute/metadata v0.5.0 // indirect
+ cloud.google.com/go/longrunning v0.5.7 // indirect
+ github.com/PuerkitoBio/purell v1.1.1 // indirect
+ github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect
+ github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 // indirect
+ github.com/felixge/httpsnoop v1.0.4 // indirect
+ github.com/go-logr/logr v1.4.2 // indirect
+ github.com/go-logr/stdr v1.2.2 // indirect
+ github.com/go-openapi/analysis v0.21.2 // indirect
+ github.com/go-openapi/errors v0.22.0 // indirect
+ github.com/go-openapi/jsonpointer v0.19.5 // indirect
+ github.com/go-openapi/jsonreference v0.19.6 // indirect
+ github.com/go-openapi/loads v0.21.1 // indirect
+ github.com/go-openapi/spec v0.20.4 // indirect
+ github.com/go-openapi/strfmt v0.23.0 // indirect
+ github.com/go-openapi/swag v0.22.3 // indirect
+ github.com/go-openapi/validate v0.21.0 // indirect
+ github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
+ github.com/google/s2a-go v0.1.8 // indirect
+ github.com/google/uuid v1.6.0 // indirect
+ github.com/googleapis/enterprise-certificate-proxy v0.3.2 // indirect
+ github.com/googleapis/gax-go/v2 v2.13.0 // indirect
+ github.com/josharian/intern v1.0.0 // indirect
+ github.com/mailru/easyjson v0.7.7 // indirect
+ github.com/mitchellh/mapstructure v1.5.0 // indirect
+ github.com/oklog/ulid v1.3.1 // indirect
+ github.com/pkg/errors v0.9.1 // indirect
+ go.mongodb.org/mongo-driver v1.14.0 // indirect
+ go.opencensus.io v0.24.0 // indirect
+ go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.51.0 // indirect
+ go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.51.0 // indirect
+ go.opentelemetry.io/otel v1.26.0 // indirect
+ go.opentelemetry.io/otel/metric v1.26.0 // indirect
+ go.opentelemetry.io/otel/trace v1.26.0 // indirect
+ golang.org/x/crypto v0.26.0 // indirect
+ golang.org/x/net v0.28.0 // indirect
+ golang.org/x/oauth2 v0.22.0 // indirect
+ golang.org/x/sync v0.8.0 // indirect
+ golang.org/x/sys v0.24.0 // indirect
+ golang.org/x/text v0.17.0 // indirect
+ golang.org/x/time v0.6.0 // indirect
+ google.golang.org/genproto/googleapis/api v0.0.0-20240725223205-93522f1f2a9f // indirect
+ google.golang.org/genproto/googleapis/rpc v0.0.0-20240814211410-ddb44dafa142 // indirect
+ google.golang.org/grpc v1.65.0 // indirect
+ google.golang.org/protobuf v1.34.2 // indirect
+ gopkg.in/yaml.v3 v3.0.1 // indirect
+)
diff --git a/ragserver/ragserver/go.sum b/ragserver/ragserver/go.sum
new file mode 100644
index 0000000..06d6154
--- /dev/null
+++ b/ragserver/ragserver/go.sum
@@ -0,0 +1,325 @@
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+cloud.google.com/go/ai v0.8.0 h1:rXUEz8Wp2OlrM8r1bfmpF2+VKqc1VJpafE3HgzRnD/w=
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diff --git a/ragserver/ragserver/json.go b/ragserver/ragserver/json.go
new file mode 100644
index 0000000..c0bb7ce
--- /dev/null
+++ b/ragserver/ragserver/json.go
@@ -0,0 +1,44 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+ "encoding/json"
+ "fmt"
+ "mime"
+ "net/http"
+)
+
+// readRequestJSON expects req to have a JSON content type with a body that
+// contains a JSON-encoded value complying with the underlying type of target.
+// It populates target, or returns an error.
+func readRequestJSON(target any, req *http.Request) error {
+ contentType := req.Header.Get("Content-Type")
+ mediaType, _, err := mime.ParseMediaType(contentType)
+ if err != nil {
+ return err
+ }
+ if mediaType != "application/json" {
+ return fmt.Errorf("expect application/json Content-Type, got %s", mediaType)
+ }
+
+ dec := json.NewDecoder(req.Body)
+ dec.DisallowUnknownFields()
+ if err := dec.Decode(target); err != nil {
+ return err
+ }
+ return nil
+}
+
+// renderJSON renders 'v' as JSON and writes it as a response into w.
+func renderJSON(w http.ResponseWriter, v interface{}) {
+ js, err := json.Marshal(v)
+ if err != nil {
+ http.Error(w, err.Error(), http.StatusInternalServerError)
+ return
+ }
+ w.Header().Set("Content-Type", "application/json")
+ w.Write(js)
+}
diff --git a/ragserver/ragserver/main.go b/ragserver/ragserver/main.go
new file mode 100644
index 0000000..e55c66f
--- /dev/null
+++ b/ragserver/ragserver/main.go
@@ -0,0 +1,246 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Command ragserver is an HTTP server that implements RAG (Retrieval
+// Augmented Generation) using the Gemini model and Weaviate. See the
+// accompanying README file for additional details.
+package main
+
+import (
+ "cmp"
+ "context"
+ "fmt"
+ "log"
+ "net/http"
+ "os"
+ "strings"
+
+ "github.com/google/generative-ai-go/genai"
+ "github.com/weaviate/weaviate-go-client/v4/weaviate"
+ "github.com/weaviate/weaviate-go-client/v4/weaviate/graphql"
+ "github.com/weaviate/weaviate/entities/models"
+ "google.golang.org/api/option"
+)
+
+const generativeModelName = "gemini-1.5-flash"
+const embeddingModelName = "text-embedding-004"
+
+// This is a standard Go HTTP server. Server state is in the ragServer struct.
+// The `main` function connects to the required services (Weaviate and Google
+// AI), initializes the server state and registers HTTP handlers.
+func main() {
+ ctx := context.Background()
+ wvClient, err := initWeaviate(ctx)
+ if err != nil {
+ log.Fatal(err)
+ }
+
+ apiKey := os.Getenv("GEMINI_API_KEY")
+ genaiClient, err := genai.NewClient(ctx, option.WithAPIKey(apiKey))
+ if err != nil {
+ log.Fatal(err)
+ }
+ defer genaiClient.Close()
+
+ server := &ragServer{
+ ctx: ctx,
+ wvClient: wvClient,
+ genModel: genaiClient.GenerativeModel(generativeModelName),
+ embModel: genaiClient.EmbeddingModel(embeddingModelName),
+ }
+
+ mux := http.NewServeMux()
+ mux.HandleFunc("POST /add/", server.addDocumentsHandler)
+ mux.HandleFunc("GET /query/", server.queryHandler)
+
+ port := cmp.Or(os.Getenv("SERVERPORT"), "9020")
+ address := "localhost:" + port
+ log.Println("listening on", address)
+ log.Fatal(http.ListenAndServe(address, mux))
+}
+
+type ragServer struct {
+ ctx context.Context
+ wvClient *weaviate.Client
+ genModel *genai.GenerativeModel
+ embModel *genai.EmbeddingModel
+}
+
+func (rs *ragServer) addDocumentsHandler(w http.ResponseWriter, req *http.Request) {
+ // Parse HTTP request from JSON.
+ type document struct {
+ Text string
+ }
+ type addRequest struct {
+ Documents []document
+ }
+ ar := &addRequest{}
+
+ err := readRequestJSON(ar, req)
+ if err != nil {
+ http.Error(w, err.Error(), http.StatusBadRequest)
+ return
+ }
+
+ // Use the batch embedding API to embed all documents at once.
+ batch := rs.embModel.NewBatch()
+ for _, doc := range ar.Documents {
+ batch.AddContent(genai.Text(doc.Text))
+ }
+ log.Printf("invoking embedding model with %v documents", len(ar.Documents))
+ rsp, err := rs.embModel.BatchEmbedContents(rs.ctx, batch)
+ if err != nil {
+ http.Error(w, err.Error(), http.StatusInternalServerError)
+ return
+ }
+ if len(rsp.Embeddings) != len(ar.Documents) {
+ http.Error(w, "embedded batch size mismatch", http.StatusInternalServerError)
+ return
+ }
+
+ // Convert our documents - along with their embedding vectors - into types
+ // used by the Weaviate client library.
+ objects := make([]*models.Object, len(ar.Documents))
+ for i, doc := range ar.Documents {
+ objects[i] = &models.Object{
+ Class: "Document",
+ Properties: map[string]any{
+ "text": doc.Text,
+ },
+ Vector: rsp.Embeddings[i].Values,
+ }
+ }
+
+ // Store documents with embeddings in the Weaviate DB.
+ log.Printf("storing %v objects in weaviate", len(objects))
+ _, err = rs.wvClient.Batch().ObjectsBatcher().WithObjects(objects...).Do(rs.ctx)
+ if err != nil {
+ http.Error(w, err.Error(), http.StatusInternalServerError)
+ return
+ }
+}
+
+func (rs *ragServer) queryHandler(w http.ResponseWriter, req *http.Request) {
+ // Parse HTTP request from JSON.
+ type queryRequest struct {
+ Content string
+ }
+ qr := &queryRequest{}
+ err := readRequestJSON(qr, req)
+ if err != nil {
+ http.Error(w, err.Error(), http.StatusBadRequest)
+ return
+ }
+
+ // Embed the query contents.
+ rsp, err := rs.embModel.EmbedContent(rs.ctx, genai.Text(qr.Content))
+ if err != nil {
+ http.Error(w, err.Error(), http.StatusInternalServerError)
+ return
+ }
+
+ // Search weaviate to find the most relevant (closest in vector space)
+ // documents to the query.
+ gql := rs.wvClient.GraphQL()
+ result, err := gql.Get().
+ WithNearVector(
+ gql.NearVectorArgBuilder().WithVector(rsp.Embedding.Values)).
+ WithClassName("Document").
+ WithFields(graphql.Field{Name: "text"}).
+ WithLimit(3).
+ Do(rs.ctx)
+ if werr := combinedWeaviateError(result, err); werr != nil {
+ http.Error(w, werr.Error(), http.StatusInternalServerError)
+ return
+ }
+
+ contents, err := decodeGetResults(result)
+ if err != nil {
+ http.Error(w, fmt.Errorf("reading weaviate response: %w", err).Error(), http.StatusInternalServerError)
+ return
+ }
+
+ // Creata a RAG query for the LLM with the most relevant documents as
+ // context.
+ ragQuery := fmt.Sprintf(ragTemplateStr, qr.Content, strings.Join(contents, "\n"))
+ resp, err := rs.genModel.GenerateContent(rs.ctx, genai.Text(ragQuery))
+ if err != nil {
+ log.Printf("calling generative model: %v", err.Error())
+ http.Error(w, "generative model error", http.StatusInternalServerError)
+ return
+ }
+
+ if len(resp.Candidates) != 1 {
+ log.Printf("got %v candidates, expected 1", len(resp.Candidates))
+ http.Error(w, "generative model error", http.StatusInternalServerError)
+ return
+ }
+
+ var respTexts []string
+ for _, part := range resp.Candidates[0].Content.Parts {
+ if pt, ok := part.(genai.Text); ok {
+ respTexts = append(respTexts, string(pt))
+ } else {
+ log.Printf("bad type of part: %v", pt)
+ http.Error(w, "generative model error", http.StatusInternalServerError)
+ return
+ }
+ }
+
+ renderJSON(w, strings.Join(respTexts, "\n"))
+}
+
+const ragTemplateStr = `
+I will ask you a question and will provide some additional context information.
+Assume this context information is factual and correct, as part of internal
+documentation.
+If the question relates to the context, answer it using the context.
+If the question does not relate to the context, answer it as normal.
+
+For example, let's say the context has nothing in it about tropical flowers;
+then if I ask you about tropical flowers, just answer what you know about them
+without referring to the context.
+
+For example, if the context does mention minerology and I ask you about that,
+provide information from the context along with general knowledge.
+
+Question:
+%s
+
+Context:
+%s
+`
+
+// decodeGetResults decodes the result returned by Weaviate's GraphQL Get
+// query; these are returned as a nested map[string]any (just like JSON
+// unmarshaled into a map[string]any). We have to extract all document contents
+// as a list of strings.
+func decodeGetResults(result *models.GraphQLResponse) ([]string, error) {
+ data, ok := result.Data["Get"]
+ if !ok {
+ return nil, fmt.Errorf("Get key not found in result")
+ }
+ doc, ok := data.(map[string]any)
+ if !ok {
+ return nil, fmt.Errorf("Get key unexpected type")
+ }
+ slc, ok := doc["Document"].([]any)
+ if !ok {
+ return nil, fmt.Errorf("Document is not a list of results")
+ }
+
+ var out []string
+ for _, s := range slc {
+ smap, ok := s.(map[string]any)
+ if !ok {
+ return nil, fmt.Errorf("invalid element in list of documents")
+ }
+ s, ok := smap["text"].(string)
+ if !ok {
+ return nil, fmt.Errorf("expected string in list of documents")
+ }
+ out = append(out, s)
+ }
+ return out, nil
+}
diff --git a/ragserver/ragserver/weaviate.go b/ragserver/ragserver/weaviate.go
new file mode 100644
index 0000000..3b6b9b2
--- /dev/null
+++ b/ragserver/ragserver/weaviate.go
@@ -0,0 +1,63 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+// Utilities for working with Weaviate.
+
+import (
+ "cmp"
+ "context"
+ "fmt"
+ "os"
+
+ "github.com/weaviate/weaviate-go-client/v4/weaviate"
+ "github.com/weaviate/weaviate/entities/models"
+)
+
+// initWeaviate initializes a weaviate client for our application.
+func initWeaviate(ctx context.Context) (*weaviate.Client, error) {
+ client, err := weaviate.NewClient(weaviate.Config{
+ Host: "localhost:" + cmp.Or(os.Getenv("WVPORT"), "9035"),
+ Scheme: "http",
+ })
+ if err != nil {
+ return nil, fmt.Errorf("initializing weaviate: %w", err)
+ }
+
+ // Create a new class (collection) in weaviate if it doesn't exist yet.
+ cls := &models.Class{
+ Class: "Document",
+ Vectorizer: "none",
+ }
+ exists, err := client.Schema().ClassExistenceChecker().WithClassName(cls.Class).Do(ctx)
+ if err != nil {
+ return nil, fmt.Errorf("weaviate error: %w", err)
+ }
+ if !exists {
+ err = client.Schema().ClassCreator().WithClass(cls).Do(ctx)
+ if err != nil {
+ return nil, fmt.Errorf("weaviate error: %w", err)
+ }
+ }
+
+ return client, nil
+}
+
+// combinedWeaviateError generates an error if err is non-nil or result has
+// errors, and returns an error (or nil if there's no error). It's useful for
+// the results of the Weaviate GraphQL API's "Do" calls.
+func combinedWeaviateError(result *models.GraphQLResponse, err error) error {
+ if err != nil {
+ return err
+ }
+ if len(result.Errors) != 0 {
+ var ss []string
+ for _, e := range result.Errors {
+ ss = append(ss, e.Message)
+ }
+ return fmt.Errorf("weaviate error: %v", ss)
+ }
+ return nil
+}
diff --git a/ragserver/tests/add-documents.sh b/ragserver/tests/add-documents.sh
new file mode 100755
index 0000000..8ec8f3e
--- /dev/null
+++ b/ragserver/tests/add-documents.sh
@@ -0,0 +1,19 @@
+#!/bin/bash
+
+# This script interacts with a running ragserver to add some example documents.
+
+set -eux
+
+echo '{
+ "documents": [
+ {"text": "TDXIRV is an environment variable for controlling throttle speed"},
+ {"text": "some flags for setting acceleration are --accelxyzp and --acceljjrv"},
+ {"text": "acceleration is also affected by the ACCUVI5 env var"},
+ {"text": "/usr/local/fuel555 contains information about fuel capacity"},
+ {"text": "we can control fuel savings with the --savemyfuelplease flag"},
+ {"text": "fuel savings can be observed on local port 48332"}
+]}' | tr -d "\n" | curl \
+ -X POST \
+ -H 'Content-Type: application/json' \
+ -d @- \
+ http://localhost:9020/add/
diff --git a/ragserver/tests/docker-compose.yml b/ragserver/tests/docker-compose.yml
new file mode 100644
index 0000000..81f45cd
--- /dev/null
+++ b/ragserver/tests/docker-compose.yml
@@ -0,0 +1,22 @@
+---
+version: '3.4'
+services:
+ weaviate:
+ command:
+ - --host
+ - 0.0.0.0
+ - --port
+ - '9035'
+ - --scheme
+ - http
+ image: cr.weaviate.io/semitechnologies/weaviate:1.25.2
+ ports:
+ - 9035:9035
+ - 50051:50051
+ restart: on-failure:0
+ environment:
+ QUERY_DEFAULTS_LIMIT: 25
+ AUTHENTICATION_ANONYMOUS_ACCESS_ENABLED: 'true'
+ PERSISTENCE_DATA_PATH: '/var/lib/weaviate'
+ CLUSTER_HOSTNAME: 'node1'
+...
diff --git a/ragserver/tests/query.sh b/ragserver/tests/query.sh
new file mode 100755
index 0000000..9013eb9
--- /dev/null
+++ b/ragserver/tests/query.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+
+set -eu
+
+# Check if an argument is provided
+if [ $# -eq 0 ]; then
+ echo "Usage: $0 '<your query>'"
+ exit 1
+fi
+
+set -x
+
+# Capture the query from the command-line argument
+QUERY_CONTENT=$1
+
+# Build the JSON payload
+PAYLOAD=$(echo "{\"content\": \"$QUERY_CONTENT\"}")
+
+# Send the request
+echo "$PAYLOAD" | tr -d "\n" | curl \
+ -X GET \
+ -H 'Content-Type: application/json' \
+ -d @- \
+ http://localhost:9020/query/ | sed 's/\\n/\n/g'
diff --git a/ragserver/tests/weaviate-delete-objects.sh b/ragserver/tests/weaviate-delete-objects.sh
new file mode 100755
index 0000000..766dfc9
--- /dev/null
+++ b/ragserver/tests/weaviate-delete-objects.sh
@@ -0,0 +1,7 @@
+#!/bin/bash
+
+set -eux
+
+curl \
+ -X DELETE \
+ http://localhost:9035/v1/schema/Document
diff --git a/ragserver/tests/weaviate-show-all.sh b/ragserver/tests/weaviate-show-all.sh
new file mode 100755
index 0000000..b49d01b
--- /dev/null
+++ b/ragserver/tests/weaviate-show-all.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -eux
+
+echo '{
+ "query": "{
+ Get {
+ Document {
+ text
+ }
+ }
+ }"
+}' | tr -d "\n" | curl \
+ -X POST \
+ -H 'Content-Type: application/json' \
+ -d @- \
+ http://localhost:9035/v1/graphql | jq .
