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Code Issues Packages Projects Releases 2 Wiki Activity

agent: fix container logs decoding for raw streams (#1535)

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henrygd
2026-01-08 13:57:56 -05:00
parent 78d742c712
commit 5da7a21119
2 changed files with 21 additions and 5 deletions
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9
agent/docker.go
View File

@@ -694,7 +694,8 @@ func (dm *dockerManager) getLogs(ctx context.Context, containerID string) (strin
}
var builder strings.Builder
if err := decodeDockerLogStream(resp.Body, &builder); err != nil {
multiplexed := resp.Header.Get("Content-Type") == "application/vnd.docker.multiplexed-stream"
if err := decodeDockerLogStream(resp.Body, &builder, multiplexed); err != nil {
return "", err
}
@@ -706,7 +707,11 @@ func (dm *dockerManager) getLogs(ctx context.Context, containerID string) (strin
return logs, nil
}
func decodeDockerLogStream(reader io.Reader, builder *strings.Builder) error {
func decodeDockerLogStream(reader io.Reader, builder *strings.Builder, multiplexed bool) error {
if !multiplexed {
_, err := io.Copy(builder, io.LimitReader(reader, maxTotalLogSize))
return err
}
const headerSize = 8
var header [headerSize]byte
totalBytesRead := 0

17
agent/docker_test.go
View File

@@ -950,6 +950,7 @@ func TestDecodeDockerLogStream(t *testing.T) {
input []byte
expected string
expectError bool
multiplexed bool
}{
{
name: "simple log entry",
@@ -960,6 +961,7 @@ func TestDecodeDockerLogStream(t *testing.T) {
},
expected: "Hello World",
expectError: false,
multiplexed: true,
},
{
name: "multiple frames",
@@ -973,6 +975,7 @@ func TestDecodeDockerLogStream(t *testing.T) {
},
expected: "HelloWorld",
expectError: false,
multiplexed: true,
},
{
name: "zero length frame",
@@ -985,12 +988,20 @@ func TestDecodeDockerLogStream(t *testing.T) {
},
expected: "Hello",
expectError: false,
multiplexed: true,
},
{
name: "empty input",
input: []byte{},
expected: "",
expectError: false,
multiplexed: true,
},
{
name: "raw stream (not multiplexed)",
input: []byte("raw log content"),
expected: "raw log content",
multiplexed: false,
},
}
@@ -998,7 +1009,7 @@ func TestDecodeDockerLogStream(t *testing.T) {
t.Run(tt.name, func(t *testing.T) {
reader := bytes.NewReader(tt.input)
var builder strings.Builder
err := decodeDockerLogStream(reader, &builder)
err := decodeDockerLogStream(reader, &builder, tt.multiplexed)
if tt.expectError {
assert.Error(t, err)
@@ -1022,7 +1033,7 @@ func TestDecodeDockerLogStreamMemoryProtection(t *testing.T) {
reader := bytes.NewReader(input)
var builder strings.Builder
err := decodeDockerLogStream(reader, &builder)
err := decodeDockerLogStream(reader, &builder, true)
assert.Error(t, err)
assert.Contains(t, err.Error(), "log frame size")
@@ -1056,7 +1067,7 @@ func TestDecodeDockerLogStreamMemoryProtection(t *testing.T) {
reader := bytes.NewReader(input)
var builder strings.Builder
err := decodeDockerLogStream(reader, &builder)
err := decodeDockerLogStream(reader, &builder, true)
// Should complete without error (graceful truncation)
assert.NoError(t, err)