1 files changed, 0 insertions, 169 deletions
diff --git a/grpc/src/cpp/ext/filters/census/rpc_encoding.h b/grpc/src/cpp/ext/filters/census/rpc_encoding.h
index b897dfcb..821c7158 100644
--- a/grpc/src/cpp/ext/filters/census/rpc_encoding.h
+++ b/grpc/src/cpp/ext/filters/census/rpc_encoding.h
@@ -31,175 +31,6 @@
 
 namespace grpc {
 
-// TODO(unknown): Rename to GrpcTraceContextV0.
-struct GrpcTraceContext {
-  GrpcTraceContext() {}
-
-  explicit GrpcTraceContext(const ::opencensus::trace::SpanContext& ctx) {
-    ctx.trace_id().CopyTo(trace_id);
-    ctx.span_id().CopyTo(span_id);
-    ctx.trace_options().CopyTo(trace_options);
-  }
-
-  ::opencensus::trace::SpanContext ToSpanContext() const {
-    return ::opencensus::trace::SpanContext(
-        ::opencensus::trace::TraceId(trace_id),
-        ::opencensus::trace::SpanId(span_id),
-        ::opencensus::trace::TraceOptions(trace_options));
-  }
-
-  // TODO(unknown): For performance:
-  // uint8_t version;
-  // uint8_t trace_id_field_id;
-  uint8_t trace_id[::opencensus::trace::TraceId::kSize];
-  // uint8_t span_id_field_id;
-  uint8_t span_id[::opencensus::trace::SpanId::kSize];
-  // uint8_t trace_options_field_id;
-  uint8_t trace_options[::opencensus::trace::TraceOptions::kSize];
-};
-
-// TraceContextEncoding encapsulates the logic for encoding and decoding of
-// trace contexts.
-class TraceContextEncoding {
- public:
-  // Size of encoded GrpcTraceContext. (16 + 8 + 1 + 4)
-  static constexpr size_t kGrpcTraceContextSize = 29;
-  // Error value.
-  static constexpr size_t kEncodeDecodeFailure = 0;
-
-  // Deserializes a GrpcTraceContext from the incoming buffer. Returns the
-  // number of bytes deserialized from the buffer. If the incoming buffer is
-  // empty or the encoding version is not supported it will return 0 bytes,
-  // currently only version 0 is supported. If an unknown field ID is
-  // encountered it will return immediately without parsing the rest of the
-  // buffer. Inlined for performance reasons.
-  static size_t Decode(absl::string_view buf, GrpcTraceContext* tc) {
-    if (buf.empty()) {
-      return kEncodeDecodeFailure;
-    }
-    uint8_t version = buf[kVersionIdOffset];
-    // TODO(unknown): Support other versions later. Only support version 0 for
-    // now.
-    if (version != kVersionId) {
-      return kEncodeDecodeFailure;
-    }
-
-    size_t pos = kVersionIdSize;
-    while (pos < buf.size()) {
-      size_t bytes_read =
-          ParseField(absl::string_view(&buf[pos], buf.size() - pos), tc);
-      if (bytes_read == 0) {
-        break;
-      } else {
-        pos += bytes_read;
-      }
-    }
-    return pos;
-  }
-
-  // Serializes a GrpcTraceContext into the provided buffer. Returns the number
-  // of bytes serialized into the buffer. If the buffer is not of sufficient
-  // size (it must be at least kGrpcTraceContextSize bytes) it will drop
-  // everything and return 0 bytes serialized. Inlined for performance reasons.
-  static size_t Encode(const GrpcTraceContext& tc, char* buf, size_t buf_size) {
-    if (buf_size < kGrpcTraceContextSize) {
-      return kEncodeDecodeFailure;
-    }
-    buf[kVersionIdOffset] = kVersionId;
-    buf[kTraceIdOffset] = kTraceIdField;
-    memcpy(&buf[kTraceIdOffset + 1], tc.trace_id,
-           opencensus::trace::TraceId::kSize);
-    buf[kSpanIdOffset] = kSpanIdField;
-    memcpy(&buf[kSpanIdOffset + 1], tc.span_id,
-           opencensus::trace::SpanId::kSize);
-    buf[kTraceOptionsOffset] = kTraceOptionsField;
-    memcpy(&buf[kTraceOptionsOffset + 1], tc.trace_options,
-           opencensus::trace::TraceOptions::kSize);
-    return kGrpcTraceContextSize;
-  }
-
- private:
-  // Parses the next field from the incoming buffer and stores the parsed value
-  // in a GrpcTraceContext struct.  If it does not recognize the field ID it
-  // will return 0, otherwise it returns the number of bytes read.
-  static size_t ParseField(absl::string_view buf, GrpcTraceContext* tc) {
-    // TODO(unknown): Add support for multi-byte field IDs.
-    if (buf.empty()) {
-      return 0;
-    }
-    // Field ID is always the first byte in a field.
-    uint32_t field_id = buf[0];
-    size_t bytes_read = kFieldIdSize;
-    switch (field_id) {
-      case kTraceIdField:
-        bytes_read += kTraceIdSize;
-        if (bytes_read > buf.size()) {
-          return 0;
-        }
-        memcpy(tc->trace_id, &buf[kFieldIdSize],
-               opencensus::trace::TraceId::kSize);
-        break;
-      case kSpanIdField:
-        bytes_read += kSpanIdSize;
-        if (bytes_read > buf.size()) {
-          return 0;
-        }
-        memcpy(tc->span_id, &buf[kFieldIdSize],
-               opencensus::trace::SpanId::kSize);
-        break;
-      case kTraceOptionsField:
-        bytes_read += kTraceOptionsSize;
-        if (bytes_read > buf.size()) {
-          return 0;
-        }
-        memcpy(tc->trace_options, &buf[kFieldIdSize],
-               opencensus::trace::TraceOptions::kSize);
-        break;
-      default:  // Invalid field ID
-        return 0;
-    }
-
-    return bytes_read;
-  }
-
-  // Size of Version ID.
-  static constexpr size_t kVersionIdSize = 1;
-  // Size of Field ID.
-  static constexpr size_t kFieldIdSize = 1;
-
-  // Offset and value for currently supported version ID.
-  static constexpr size_t kVersionIdOffset = 0;
-  static constexpr size_t kVersionId = 0;
-
-  // Fixed Field ID values:
-  enum FieldIdValue {
-    kTraceIdField = 0,
-    kSpanIdField = 1,
-    kTraceOptionsField = 2,
-  };
-
-  // Field data sizes in bytes
-  enum FieldSize {
-    kTraceIdSize = 16,
-    kSpanIdSize = 8,
-    kTraceOptionsSize = 1,
-  };
-
-  // Fixed size offsets for field ID start positions during encoding.  Field
-  // data immediately follows.
-  enum FieldIdOffset {
-    kTraceIdOffset = kVersionIdSize,
-    kSpanIdOffset = kTraceIdOffset + kFieldIdSize + kTraceIdSize,
-    kTraceOptionsOffset = kSpanIdOffset + kFieldIdSize + kSpanIdSize,
-  };
-
-  TraceContextEncoding() = delete;
-  TraceContextEncoding(const TraceContextEncoding&) = delete;
-  TraceContextEncoding(TraceContextEncoding&&) = delete;
-  TraceContextEncoding operator=(const TraceContextEncoding&) = delete;
-  TraceContextEncoding operator=(TraceContextEncoding&&) = delete;
-};
-
 // TODO(unknown): This may not be needed. Check to see if opencensus requires
 // a trailing server response.
 // RpcServerStatsEncoding encapsulates the logic for encoding and decoding of