testutils.go•2.95 kB
// Copyright 2024 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package testutils
import (
"bufio"
"context"
"fmt"
"io"
"os"
"regexp"
"strings"
"github.com/googleapis/genai-toolbox/internal/log"
"github.com/googleapis/genai-toolbox/internal/util"
)
// formatYaml is a utility function for stripping out tabs in multiline strings
func FormatYaml(in string) []byte {
// removes any leading indentation(tabs)
in = strings.ReplaceAll(in, "\n\t", "\n ")
// converts remaining indentation
in = strings.ReplaceAll(in, "\t", " ")
return []byte(in)
}
// ContextWithNewLogger create a new context with new logger
func ContextWithNewLogger() (context.Context, error) {
ctx := context.Background()
logger, err := log.NewStdLogger(os.Stdout, os.Stderr, "info")
if err != nil {
return nil, fmt.Errorf("unable to create logger: %s", err)
}
return util.WithLogger(ctx, logger), nil
}
// WaitForString waits until the server logs a single line that matches the provided regex.
// returns the output of whatever the server sent so far.
func WaitForString(ctx context.Context, re *regexp.Regexp, pr io.ReadCloser) (string, error) {
in := bufio.NewReader(pr)
ctx, cancel := context.WithCancel(ctx)
defer cancel()
// read lines in background, sending result of each read over a channel
// this allows us to use in.ReadString without blocking
type result struct {
s string
err error
}
output := make(chan result)
go func() {
defer close(output)
for {
select {
case <-ctx.Done():
// if the context is canceled, the orig thread will send back the error
// so we can just exit the goroutine here
return
default:
// otherwise read a line from the output
s, err := in.ReadString('\n')
if err != nil {
output <- result{err: err}
return
}
output <- result{s: s}
// if that last string matched, exit the goroutine
if re.MatchString(s) {
return
}
}
}
}()
// collect the output until the ctx is canceled, an error was hit,
// or match was found (which is indicated the channel is closed)
var sb strings.Builder
for {
select {
case <-ctx.Done():
// if ctx is done, return that error
return sb.String(), ctx.Err()
case o, ok := <-output:
if !ok {
// match was found!
return sb.String(), nil
}
if o.err != nil {
// error was found!
return sb.String(), o.err
}
sb.WriteString(o.s)
}
}
}