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/*
*
* Copyright 2016 gRPC authors.
*
* 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.
*
*/
#include <grpc/census.h>
#include <grpc/support/log.h>
#include <grpc/support/port_platform.h>
#include <grpc/support/useful.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include "src/core/ext/census/base_resources.h"
#include "src/core/ext/census/resource.h"
#include "test/core/util/test_config.h"
#include "src/core/ext/census/gen/trace_context.pb.h"
#include "src/core/ext/census/trace_context.h"
#include "third_party/nanopb/pb_decode.h"
#include "third_party/nanopb/pb_encode.h"
#define BUF_SIZE 256
/* Encodes a TraceContext structure (ctxt1) to a buffer, and then decodes it
to a second TraceContext (ctxt2). Validates that the resulting TraceContext
has a span_id, trace_id, and that the values are equal to those in initial
TraceContext. On success, returns true. If encode_trace_context returns 0,
decode_trace_context fails, or the resulting TraceContext is missing a trace_id
or span_id, it will return false. */
bool validate_encode_decode_context(google_trace_TraceContext *ctxt1,
uint8_t *buffer, size_t buf_size) {
google_trace_TraceContext ctxt2 = google_trace_TraceContext_init_zero;
size_t msg_length;
msg_length = encode_trace_context(ctxt1, buffer, buf_size);
if (msg_length == 0) {
return false;
}
if (!decode_trace_context(&ctxt2, buffer, msg_length)) {
return false;
}
if (!ctxt2.has_trace_id_hi || !ctxt2.has_trace_id_lo || !ctxt2.has_span_id) {
return false;
}
GPR_ASSERT(ctxt1->trace_id_hi == ctxt2.trace_id_hi &&
ctxt1->trace_id_lo == ctxt2.trace_id_lo &&
ctxt1->span_id == ctxt2.span_id &&
ctxt1->has_span_options == ctxt2.has_span_options &&
(ctxt1->has_span_options
? ctxt1->span_options == ctxt2.span_options
: true));
return true;
}
/* Decodes a proto-encoded TraceContext from a buffer. If decode_trace_context
fails or the resulting TraceContext is missing a trace_id or span_id it will
return false, otherwise returns true. */
bool validate_decode_context(google_trace_TraceContext *ctxt, uint8_t *buffer,
size_t msg_length) {
// Validate the decoding of a context written to buffer.
if (!decode_trace_context(ctxt, buffer, msg_length)) {
return false;
}
if (!ctxt->has_trace_id_hi || !ctxt->has_trace_id_lo || !ctxt->has_span_id) {
return false;
}
return true;
}
/* Read an encoded trace context from a file. Validates that the decoding
gives the expected result (succeed). */
static void read_and_validate_context_from_file(google_trace_TraceContext *ctxt,
const char *file,
const bool succeed) {
uint8_t buffer[BUF_SIZE];
FILE *input = fopen(file, "rb");
GPR_ASSERT(input != NULL);
size_t nbytes = fread(buffer, 1, BUF_SIZE, input);
GPR_ASSERT(nbytes <= BUF_SIZE && feof(input) && !ferror(input));
bool res = validate_decode_context(ctxt, buffer, nbytes);
GPR_ASSERT(res == succeed);
GPR_ASSERT(fclose(input) == 0);
}
// Test full proto-buffer.
static void test_full() {
google_trace_TraceContext ctxt = google_trace_TraceContext_init_zero;
read_and_validate_context_from_file(
&ctxt, "test/core/census/data/context_full.pb", true);
}
// Test empty proto-buffer.
static void test_empty() {
google_trace_TraceContext ctxt = google_trace_TraceContext_init_zero;
read_and_validate_context_from_file(
&ctxt, "test/core/census/data/context_empty.pb", false);
}
// Test proto-buffer with only trace_id.
static void test_trace_only() {
google_trace_TraceContext ctxt = google_trace_TraceContext_init_zero;
read_and_validate_context_from_file(
&ctxt, "test/core/census/data/context_trace_only.pb", false);
}
// Test proto-buffer with only span_id.
static void test_span_only() {
google_trace_TraceContext ctxt = google_trace_TraceContext_init_zero;
read_and_validate_context_from_file(
&ctxt, "test/core/census/data/context_span_only.pb", false);
}
// Test proto-buffer without span_options value.
static void test_no_span_options() {
google_trace_TraceContext ctxt = google_trace_TraceContext_init_zero;
read_and_validate_context_from_file(
&ctxt, "test/core/census/data/context_no_span_options.pb", true);
GPR_ASSERT(ctxt.has_span_options == false && ctxt.span_options == 0);
}
static void test_encode_decode() {
uint8_t buffer[BUF_SIZE] = {0};
google_trace_TraceContext ctxt1 = google_trace_TraceContext_init_zero;
ctxt1.has_trace_id_hi = true;
ctxt1.has_trace_id_lo = true;
ctxt1.trace_id_lo = 1;
ctxt1.trace_id_hi = 2;
ctxt1.has_span_id = true;
ctxt1.span_id = 3;
validate_encode_decode_context(&ctxt1, buffer, sizeof(buffer));
// Missing trace_id. This should fail.
google_trace_TraceContext ctxt2 = google_trace_TraceContext_init_zero;
ctxt2.has_trace_id_hi = false;
ctxt2.has_trace_id_lo = false;
ctxt2.has_span_id = true;
validate_encode_decode_context(&ctxt2, buffer, sizeof(buffer));
}
// Test a corrupted proto-buffer. This should fail.
static void test_corrupt() {
uint8_t buffer[BUF_SIZE] = {0};
google_trace_TraceContext ctxt1 = google_trace_TraceContext_init_zero;
size_t msg_length;
ctxt1.has_trace_id_hi = true;
ctxt1.has_trace_id_lo = true;
ctxt1.trace_id_lo = 1;
ctxt1.trace_id_hi = 2;
ctxt1.has_span_id = true;
ctxt1.span_id = 3;
ctxt1.has_span_options = true;
ctxt1.span_options = SPAN_OPTIONS_IS_SAMPLED;
msg_length = encode_trace_context(&ctxt1, buffer, sizeof(buffer));
/* Corrupt some bytes. 255 (0xFF) should be illegal for the first byte of the
proto encoded object. */
buffer[0] = 255;
bool res = validate_decode_context(&ctxt1, buffer, msg_length);
GPR_ASSERT(res == false);
}
static void test_buffer_size() {
// This buffer is too small. This should fail.
uint8_t buffer[16] = {0};
google_trace_TraceContext ctxt1 = google_trace_TraceContext_init_zero;
size_t msg_length;
ctxt1.has_trace_id_hi = true;
ctxt1.has_trace_id_lo = true;
ctxt1.trace_id_lo = 1;
ctxt1.trace_id_hi = 2;
ctxt1.has_span_id = true;
ctxt1.span_id = 3;
ctxt1.has_span_options = true;
ctxt1.span_options = SPAN_OPTIONS_IS_SAMPLED;
msg_length = encode_trace_context(&ctxt1, buffer, sizeof(buffer));
GPR_ASSERT(msg_length == 0);
}
int main(int argc, char **argv) {
grpc_test_init(argc, argv);
test_full();
test_empty();
test_trace_only();
test_span_only();
test_encode_decode();
test_corrupt();
test_no_span_options();
test_buffer_size();
return 0;
}
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