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fix: update otel integration to properly activate span context for lazy RPCs such as reads & writes pt.2 by BenWhitehead · Pull Request #3277 · googleapis/java-storage · GitHub

/ java-storage Public

fix: update otel integration to properly activate span context for lazy RPCs such as reads & writes pt.2 #3277

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Merged
BenWhitehead merged 1 commit into from
Sep 4, 2025
Conversation 0 Commits 1 Checks 21 Files changed
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fix: update otel integration to properly activate span context for lazy RPCs such as reads & writes pt.2 #3277

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160 changes: 67 additions & 93 deletions google-cloud-storage/src/main/java/com/google/cloud/storage/OtelStorageDecorator.java
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Original file line number Diff line number Diff line change
Expand Up @@ -1608,16 +1608,13 @@ static final class OtelDecoratedReadChannel implements ReadChannel {
@VisibleForTesting final ReadChannel reader;
private final Span span;

private volatile Scope scope;

private OtelDecoratedReadChannel(ReadChannel reader, Span span) {
this.reader = reader;
this.span = span;
}

@Override
public void seek(long position) throws IOException {
clearScope();
reader.seek(position);
}

Expand All @@ -1633,7 +1630,6 @@ public RestorableState<ReadChannel> capture() {

@Override
public ReadChannel limit(long limit) {
clearScope();
return reader.limit(limit);
}

Expand All @@ -1644,8 +1640,9 @@ public long limit() {

@Override
public int read(ByteBuffer dst) throws IOException {
setScope();
return reader.read(dst);
try (Scope ignore = span.makeCurrent()) {
return reader.read(dst);
}
}

@Override
Expand All @@ -1655,27 +1652,12 @@ public boolean isOpen() {

@Override
public void close() {
setScope();
try {
try (Scope ignore = span.makeCurrent()) {
reader.close();
} finally {
span.end();
clearScope();
}
}

private void clearScope() {
try (Scope ignore = scope) {
scope = null;
}
}

public void setScope() {
if (scope != null) {
clearScope();
}
scope = span.makeCurrent();
}
}

private final class OtelDecoratedBlobWriteSession implements BlobWriteSession {
Expand Down Expand Up @@ -1718,17 +1700,16 @@ private class OtelDecoratingWritableByteChannel implements WritableByteChannel {
private final WritableByteChannel delegate;
private final Span openSpan;

private Scope scope;

private OtelDecoratingWritableByteChannel(WritableByteChannel delegate, Span openSpan) {
this.delegate = delegate;
this.openSpan = openSpan;
}

@Override
public int write(ByteBuffer src) throws IOException {
setScope();
return delegate.write(src);
try (Scope ignore = openSpan.makeCurrent()) {
return delegate.write(src);
}
}

@Override
Expand All @@ -1738,8 +1719,7 @@ public boolean isOpen() {

@Override
public void close() throws IOException {
setScope();
try {
try (Scope ignore = openSpan.makeCurrent()) {
delegate.close();
} catch (IOException | RuntimeException e) {
openSpan.recordException(e);
Expand All @@ -1750,21 +1730,7 @@ public void close() throws IOException {
} finally {
openSpan.end();
sessionSpan.end();
clearScope();
}
}

private void clearScope() {
try (Scope ignore = scope) {
scope = null;
}
}

public void setScope() {
if (scope != null) {
clearScope();
}
scope = openSpan.makeCurrent();
}
}
}
Expand All @@ -1774,8 +1740,6 @@ static final class OtelDecoratedWriteChannel implements WriteChannel {
@VisibleForTesting final WriteChannel delegate;
private final Span openSpan;

private Scope scope;

private OtelDecoratedWriteChannel(WriteChannel delegate, Span openSpan) {
this.delegate = delegate;
this.openSpan = openSpan;
Expand All @@ -1793,8 +1757,9 @@ public RestorableState<WriteChannel> capture() {

@Override
public int write(ByteBuffer src) throws IOException {
setScope();
return delegate.write(src);
try (Scope ignore = openSpan.makeCurrent()) {
return delegate.write(src);
}
}

@Override
Expand All @@ -1804,31 +1769,16 @@ public boolean isOpen() {

@Override
public void close() throws IOException {
setScope();
try {
try (Scope ignore = openSpan.makeCurrent()) {
delegate.close();
} catch (IOException | RuntimeException e) {
openSpan.recordException(e);
openSpan.setStatus(StatusCode.ERROR, e.getClass().getSimpleName());
throw e;
} finally {
openSpan.end();
clearScope();
}
}

private void clearScope() {
try (Scope ignore = scope) {
scope = null;
}
}

public void setScope() {
if (scope != null) {
clearScope();
}
scope = openSpan.makeCurrent();
}
}

private final class OtelDecoratedCopyWriter extends CopyWriter {
Expand Down Expand Up @@ -2205,21 +2155,34 @@ private final class OtelDecoratingAppendableUploadWriteableByteChannel
implements AppendableUploadWriteableByteChannel {
private final AppendableUploadWriteableByteChannel delegate;
private final Span openSpan;

private volatile Scope scope;
private final Tracer tracer;

private OtelDecoratingAppendableUploadWriteableByteChannel(
AppendableUploadWriteableByteChannel delegate, Span openSpan) {
this.delegate = delegate;
this.openSpan = openSpan;
this.tracer =
TracerDecorator.decorate(
Context.current(),
otel,
OtelStorageDecorator.this.baseAttributes,
AppendableUploadWriteableByteChannel.class.getName() + "/");
}

@Override
@BetaApi
public void finalizeAndClose() throws IOException {
setScope();
try {
delegate.finalizeAndClose();
try (Scope ignore = openSpan.makeCurrent()) {
Span span = tracer.spanBuilder("finalizeAndClose").startSpan();
try (Scope ignore2 = span.makeCurrent()) {
delegate.finalizeAndClose();
} catch (Throwable t) {
span.recordException(t);
span.setStatus(StatusCode.ERROR, t.getClass().getSimpleName());
throw t;
} finally {
span.end();
}
} catch (IOException | RuntimeException e) {
openSpan.recordException(e);
openSpan.setStatus(StatusCode.ERROR, e.getClass().getSimpleName());
Expand All @@ -2229,16 +2192,23 @@ public void finalizeAndClose() throws IOException {
} finally {
openSpan.end();
uploadSpan.end();
clearScope();
}
}

@Override
@BetaApi
public void closeWithoutFinalizing() throws IOException {
setScope();
try {
delegate.closeWithoutFinalizing();
try (Scope ignore = openSpan.makeCurrent()) {
Span span = tracer.spanBuilder("closeWithoutFinalizing").startSpan();
try (Scope ignore2 = span.makeCurrent()) {
delegate.closeWithoutFinalizing();
} catch (Throwable t) {
span.recordException(t);
span.setStatus(StatusCode.ERROR, t.getClass().getSimpleName());
throw t;
} finally {
span.end();
}
} catch (IOException | RuntimeException e) {
openSpan.recordException(e);
openSpan.setStatus(StatusCode.ERROR, e.getClass().getSimpleName());
Expand All @@ -2248,16 +2218,23 @@ public void closeWithoutFinalizing() throws IOException {
} finally {
openSpan.end();
uploadSpan.end();
clearScope();
}
}

@Override
@BetaApi
public void close() throws IOException {
setScope();
try {
delegate.close();
try (Scope ignore = openSpan.makeCurrent()) {
Span span = tracer.spanBuilder("close").startSpan();
try (Scope ignore2 = span.makeCurrent()) {
delegate.close();
} catch (Throwable t) {
span.recordException(t);
span.setStatus(StatusCode.ERROR, t.getClass().getSimpleName());
throw t;
} finally {
span.end();
}
} catch (IOException | RuntimeException e) {
openSpan.recordException(e);
openSpan.setStatus(StatusCode.ERROR, e.getClass().getSimpleName());
Expand All @@ -2267,39 +2244,36 @@ public void close() throws IOException {
} finally {
openSpan.end();
uploadSpan.end();
clearScope();
}
}

@Override
public void flush() throws IOException {
setScope();
delegate.flush();
try (Scope ignore = openSpan.makeCurrent()) {
Span span = tracer.spanBuilder("flush").startSpan();
try (Scope ignore2 = span.makeCurrent()) {
delegate.flush();
} catch (Throwable t) {
span.recordException(t);
span.setStatus(StatusCode.ERROR, t.getClass().getSimpleName());
throw t;
} finally {
span.end();
}
}
}

@Override
public int write(ByteBuffer src) throws IOException {
setScope();
return delegate.write(src);
try (Scope ignore = openSpan.makeCurrent()) {
return delegate.write(src);
}
}

@Override
public boolean isOpen() {
return delegate.isOpen();
}

private void clearScope() {
try (Scope ignore = scope) {
scope = null;
}
}

public void setScope() {
if (scope != null) {
clearScope();
}
scope = openSpan.makeCurrent();
}
}
}
}
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