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utils.go
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utils.go
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package main
import (
"bufio"
"context"
"database/sql"
"errors"
"fmt"
"io"
"log"
"os"
"reflect"
"strings"
"time"
_ "github.com/lib/pq"
"github.com/google/generative-ai-go/genai"
"google.golang.org/api/googleapi"
)
// ParamMap holds key-value pairs for string replacement.
type ParamMap map[string]string
// String implements the flag.Value interface for ParamMap.
func (*ParamMap) String() string { return "" }
// Set implements the flag.Value interface for ParamMap.
func (m *ParamMap) Set(kv string) error {
parts := strings.SplitN(kv, "=", 2) // limit splits to 2
if len(parts) != 2 {
return fmt.Errorf("invalid parameter %s", kv)
}
(*m)[parts[0]] = parts[1]
return nil
}
// ParamArray holds a list of strings.
type ParamArray []string
// String implements the flag.Value interface for ParamMap.
func (*ParamArray) String() string { return "" }
// Set implements the flag.Value interface for ParamMap.
func (a *ParamArray) Set(val string) error {
*a = append(*a, val)
return nil
}
// hasInputFromPipe checks if input is being piped to the program.
func hasInputFromStdin(in io.Reader) bool {
if f, ok := in.(*os.File); ok {
fileInfo, _ := f.Stat()
return fileInfo.Mode()&os.ModeCharDevice == 0
} else {
// avoid destructive io function call
r := reflect.ValueOf(in)
v := reflect.Indirect(r).FieldByName("s")
return len(v.String()) > 0
}
}
// hasOutputRedirected checks if ok to emit non-printable characters.
func hasOutputRedirected(out io.Writer) bool {
if f, ok := out.(*os.File); ok {
fileInfo, _ := f.Stat()
return fileInfo.Mode()&os.ModeCharDevice == 0
}
return true
}
// readLine reads a line from standard input.
func readLine(r io.Reader) (string, error) {
scanner := bufio.NewScanner(r)
if scanner.Scan() {
return scanner.Text(), nil
}
return "", scanner.Err()
}
// searchReplace performs string replacement based on key-value pairs.
func searchReplace(prompt string, pm ParamMap) string {
res := prompt
for k, v := range pm {
res = strings.ReplaceAll(res, "{"+k+"}", v) // all occurrences
}
return res
}
// knownTools returns string of comma-separated function names.
func knownTools() string {
var res []string
genTool := reflect.TypeOf(Tool{})
for i := 0; i < genTool.NumMethod(); i++ {
res = append(res, genTool.Method(i).Name)
}
return strings.Join(res, ",")
}
// registerTools declares functions of Tool in genai.FunctionDeclaration format.
// TODO support other argument types than string
func registerTools(model *genai.GenerativeModel) {
genTool := reflect.TypeOf(Tool{})
n := genTool.NumMethod()
funDecl := make([]*genai.FunctionDeclaration, n)
for i := 0; i < n; i++ {
m := genTool.Method(i)
f := reflect.ValueOf(Tool{}).MethodByName(m.Name)
t := f.Type()
argMap := make(map[string]*genai.Schema)
if t.NumIn() > 0 {
for j := 0; j < t.NumIn(); j++ {
switch t.In(j).Kind() {
case reflect.String:
argMap[fmt.Sprintf("arg%d", j)] = &genai.Schema{Type: genai.TypeString}
}
}
funDecl[i] = &genai.FunctionDeclaration{
Name: m.Name,
Parameters: &genai.Schema{
Type: genai.TypeObject,
Properties: argMap,
},
}
} else {
funDecl[i] = &genai.FunctionDeclaration{
Name: m.Name,
}
}
}
model.Tools = make([]*genai.Tool, 1)
model.Tools[0] = &genai.Tool{
FunctionDeclarations: funDecl,
}
}
// invokeTool calls tool identified by genai.FunctionCall using anonymous argument names.
func invokeTool(fc genai.FunctionCall) string {
f := reflect.ValueOf(Tool{}).MethodByName(fc.Name)
var args []reflect.Value
for i := 0; i < len(fc.Args); i++ {
t := f.Type().In(i)
v := reflect.New(t).Elem()
arg := fc.Args[fmt.Sprintf("arg%d", i)]
switch t.Kind() {
case reflect.String:
v.SetString(arg.(string))
}
args = append(args, v)
}
vals := f.Call(args)
if err := vals[1].Interface(); err != nil {
return fmt.Sprint(err)
}
return vals[0].String()
}
// printGeneratedResponse emits LLM content, invokes tool if FunctionCall found.
func emitGeneratedResponse(out io.Writer, resp *genai.GenerateContentResponse) {
var res string
for _, cand := range resp.Candidates {
if cand.Content != nil {
for _, part := range cand.Content.Parts {
if fc, ok := part.(genai.FunctionCall); ok {
res += invokeTool(fc)
} else {
res += fmt.Sprintf("%s", part)
}
}
if !hasOutputRedirected(out) {
fmt.Fprintf(out, "\033[97m%s\033[0m", res)
} else {
fmt.Fprintf(out, "%s", res)
}
}
}
}
// genLogFatal refines the error if available.
func genLogFatal(err error) {
var gerr *googleapi.Error
if errors.As(err, &gerr) {
log.Fatal(gerr)
} else {
log.Fatal(err)
}
}
// uploadFile tracks state until FileStateActive reached.
func uploadFile(ctx context.Context, client *genai.Client, path string) (*genai.File, error) {
fd, err := os.Open(path)
if err != nil {
return nil, err
}
defer fd.Close()
file, err := client.UploadFile(ctx, "", fd, nil)
if err != nil {
return nil, err
}
for file.State == genai.FileStateProcessing {
time.Sleep(1 * time.Second)
file, err = client.GetFile(ctx, file.Name)
if err != nil {
return nil, err
}
}
if file.State != genai.FileStateActive {
return nil, fmt.Errorf("uploaded file has state %s", file.State)
}
return file, nil
}
// anyMatches returns true if any of the match candidates are found in
func anyMatches(strArray []string, candidates ...string) bool {
for _, s := range strArray {
for _, c := range candidates {
if strings.Contains(strings.ToLower(s), strings.ToLower(c)) {
return true
}
}
}
return false
}
// allMatch returns true if all list elements match.
func allMatch(strArray []string, cand string) bool {
if len(strArray) == 0 {
return false
}
for _, s := range strArray {
if !strings.Contains(strings.ToLower(s), strings.ToLower(cand)) {
return false
}
}
return true
}
// oneMatches returns true if one and only one matches.
func oneMatches(strArray []string, cand string) bool {
var res int
for _, s := range strArray {
if strings.Contains(strings.ToLower(s), strings.ToLower(cand)) {
res += 1
}
}
return res == 1
}
// QueryPostgres submits query to database set by DSN parameter.
func QueryPostgres(query string) (string, error) {
var res []string
dsn, ok := keyVals["DSN"]
if !ok || len(dsn) == 0 {
return "", fmt.Errorf("DSN parameter missing")
}
db, err := sql.Open("postgres", dsn)
if err != nil {
return "", err
}
defer db.Close()
rows, err := db.Query(query)
if err != nil {
return "", err
}
defer rows.Close()
cols, _ := rows.Columns()
row := make([]interface{}, len(cols))
rowPtr := make([]interface{}, len(cols))
for i := range row {
rowPtr[i] = &row[i]
}
for rows.Next() {
err := rows.Scan(rowPtr...)
if err != nil {
return "", err
}
res = append(res, fmt.Sprintf("%v", row))
}
if err := rows.Err(); err != nil {
return "", err
}
return strings.Join(res, "\n"), nil
}