static void fail_no_event_received(cq_verifier *v) {
gpr_strvec buf;
char *msg;
gpr_strvec_init(&buf);
gpr_strvec_add(&buf, gpr_strdup("no event received, but expected:\n"));
expectations_to_strvec(&buf, v);
msg = gpr_strvec_flatten(&buf, NULL);
gpr_log(GPR_ERROR, "%s", msg);
gpr_strvec_destroy(&buf);
gpr_free(msg);
abort();
}
char *grpc_sopb_string(grpc_stream_op_buffer *sopb) {
char *out;
char *tmp;
size_t i;
gpr_strvec b;
gpr_strvec_init(&b);
for (i = 0; i < sopb->nops; i++) {
grpc_stream_op *op = &sopb->ops[i];
if (i > 0) gpr_strvec_add(&b, gpr_strdup(", "));
switch (op->type) {
case GRPC_NO_OP:
gpr_strvec_add(&b, gpr_strdup("NO_OP"));
break;
case GRPC_OP_BEGIN_MESSAGE:
gpr_asprintf(&tmp, "BEGIN_MESSAGE:%d", op->data.begin_message.length);
gpr_strvec_add(&b, tmp);
break;
case GRPC_OP_SLICE:
gpr_asprintf(&tmp, "SLICE:%d", GPR_SLICE_LENGTH(op->data.slice));
gpr_strvec_add(&b, tmp);
break;
case GRPC_OP_METADATA:
gpr_strvec_add(&b, gpr_strdup("METADATA{"));
put_metadata_list(&b, op->data.metadata);
gpr_strvec_add(&b, gpr_strdup("}"));
break;
}
}
out = gpr_strvec_flatten(&b, NULL);
gpr_strvec_destroy(&b);
return out;
}
gpr_slice grpc_httpcli_format_post_request(const grpc_httpcli_request *request,
const char *body_bytes,
size_t body_size) {
gpr_strvec out;
char *tmp;
size_t out_len;
size_t i;
gpr_strvec_init(&out);
gpr_strvec_add(&out, gpr_strdup("POST "));
fill_common_header(request, &out);
if (body_bytes) {
uint8_t has_content_type = 0;
for (i = 0; i < request->http.hdr_count; i++) {
if (strcmp(request->http.hdrs[i].key, "Content-Type") == 0) {
has_content_type = 1;
break;
}
}
if (!has_content_type) {
gpr_strvec_add(&out, gpr_strdup("Content-Type: text/plain\r\n"));
}
gpr_asprintf(&tmp, "Content-Length: %lu\r\n", (unsigned long)body_size);
gpr_strvec_add(&out, tmp);
}
gpr_strvec_add(&out, gpr_strdup("\r\n"));
tmp = gpr_strvec_flatten(&out, &out_len);
gpr_strvec_destroy(&out);
if (body_bytes) {
tmp = gpr_realloc(tmp, out_len + body_size);
memcpy(tmp + out_len, body_bytes, body_size);
out_len += body_size;
}
return gpr_slice_new(tmp, out_len, gpr_free);
}
void cq_verify(cq_verifier *v) {
gpr_timespec deadline = GRPC_TIMEOUT_SECONDS_TO_DEADLINE(10);
grpc_event ev;
expectation *e;
char *s;
gpr_strvec have_tags;
gpr_strvec_init(&have_tags);
while (v->expect.next != &v->expect) {
ev = grpc_completion_queue_next(v->cq, deadline, NULL);
if (ev.type == GRPC_QUEUE_TIMEOUT) {
fail_no_event_received(v);
break;
}
for (e = v->expect.next; e != &v->expect; e = e->next) {
gpr_asprintf(&s, " %p", e->tag);
gpr_strvec_add(&have_tags, s);
if (e->tag == ev.tag) {
verify_matches(e, &ev);
e->next->prev = e->prev;
e->prev->next = e->next;
gpr_free(e);
break;
}
}
if (e == &v->expect) {
s = grpc_event_string(&ev);
gpr_log(GPR_ERROR, "event not found: %s", s);
gpr_free(s);
s = gpr_strvec_flatten(&have_tags, NULL);
gpr_log(GPR_ERROR, "have tags:%s", s);
gpr_free(s);
gpr_strvec_destroy(&have_tags);
abort();
}
}
gpr_strvec_destroy(&have_tags);
}
// Parses the method config from \a json. Adds an entry to \a entries for
// each name found, incrementing \a idx for each entry added.
// Returns false on error.
static bool parse_json_method_config(
grpc_exec_ctx* exec_ctx, grpc_json* json,
void* (*create_value)(const grpc_json* method_config_json),
const grpc_slice_hash_table_vtable* vtable,
grpc_slice_hash_table_entry* entries, size_t* idx) {
// Construct value.
void* method_config = create_value(json);
if (method_config == NULL) return false;
// Construct list of paths.
bool success = false;
gpr_strvec paths;
gpr_strvec_init(&paths);
for (grpc_json* child = json->child; child != NULL; child = child->next) {
if (child->key == NULL) continue;
if (strcmp(child->key, "name") == 0) {
if (child->type != GRPC_JSON_ARRAY) goto done;
for (grpc_json* name = child->child; name != NULL; name = name->next) {
char* path = parse_json_method_name(name);
gpr_strvec_add(&paths, path);
}
}
}
if (paths.count == 0) goto done; // No names specified.
// Add entry for each path.
for (size_t i = 0; i < paths.count; ++i) {
entries[*idx].key = grpc_slice_from_copied_string(paths.strs[i]);
entries[*idx].value = vtable->copy_value(method_config);
entries[*idx].vtable = vtable;
++*idx;
}
success = true;
done:
vtable->destroy_value(exec_ctx, method_config);
gpr_strvec_destroy(&paths);
return success;
}
char *grpc_transport_stream_op_string(grpc_transport_stream_op *op) {
char *tmp;
char *out;
gpr_strvec b;
gpr_strvec_init(&b);
gpr_strvec_add(
&b, gpr_strdup(op->covered_by_poller ? "[COVERED]" : "[UNCOVERED]"));
if (op->send_initial_metadata != NULL) {
gpr_strvec_add(&b, gpr_strdup(" "));
gpr_strvec_add(&b, gpr_strdup("SEND_INITIAL_METADATA{"));
put_metadata_list(&b, *op->send_initial_metadata);
gpr_strvec_add(&b, gpr_strdup("}"));
}
if (op->send_message != NULL) {
gpr_strvec_add(&b, gpr_strdup(" "));
gpr_asprintf(&tmp, "SEND_MESSAGE:flags=0x%08x:len=%d",
op->send_message->flags, op->send_message->length);
gpr_strvec_add(&b, tmp);
}
if (op->send_trailing_metadata != NULL) {
gpr_strvec_add(&b, gpr_strdup(" "));
gpr_strvec_add(&b, gpr_strdup("SEND_TRAILING_METADATA{"));
put_metadata_list(&b, *op->send_trailing_metadata);
gpr_strvec_add(&b, gpr_strdup("}"));
}
if (op->recv_initial_metadata != NULL) {
gpr_strvec_add(&b, gpr_strdup(" "));
gpr_strvec_add(&b, gpr_strdup("RECV_INITIAL_METADATA"));
}
if (op->recv_message != NULL) {
gpr_strvec_add(&b, gpr_strdup(" "));
gpr_strvec_add(&b, gpr_strdup("RECV_MESSAGE"));
}
if (op->recv_trailing_metadata != NULL) {
gpr_strvec_add(&b, gpr_strdup(" "));
gpr_strvec_add(&b, gpr_strdup("RECV_TRAILING_METADATA"));
}
if (op->cancel_error != GRPC_ERROR_NONE) {
gpr_strvec_add(&b, gpr_strdup(" "));
const char *msg = grpc_error_string(op->cancel_error);
gpr_asprintf(&tmp, "CANCEL:%s", msg);
grpc_error_free_string(msg);
gpr_strvec_add(&b, tmp);
}
if (op->close_error != GRPC_ERROR_NONE) {
gpr_strvec_add(&b, gpr_strdup(" "));
const char *msg = grpc_error_string(op->close_error);
gpr_asprintf(&tmp, "CLOSE:%s", msg);
grpc_error_free_string(msg);
gpr_strvec_add(&b, tmp);
}
out = gpr_strvec_flatten(&b, NULL);
gpr_strvec_destroy(&b);
return out;
}
char *grpc_transport_op_string(grpc_transport_op *op) {
char *tmp;
char *out;
bool first = true;
gpr_strvec b;
gpr_strvec_init(&b);
if (op->on_connectivity_state_change != NULL) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = false;
if (op->connectivity_state != NULL) {
gpr_asprintf(&tmp, "ON_CONNECTIVITY_STATE_CHANGE:p=%p:from=%s",
op->on_connectivity_state_change,
grpc_connectivity_state_name(*op->connectivity_state));
gpr_strvec_add(&b, tmp);
} else {
gpr_asprintf(&tmp, "ON_CONNECTIVITY_STATE_CHANGE:p=%p:unsubscribe",
op->on_connectivity_state_change);
gpr_strvec_add(&b, tmp);
}
}
if (op->disconnect_with_error != GRPC_ERROR_NONE) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = false;
const char *err = grpc_error_string(op->disconnect_with_error);
gpr_asprintf(&tmp, "DISCONNECT:%s", err);
gpr_strvec_add(&b, tmp);
grpc_error_free_string(err);
}
if (op->send_goaway) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = false;
char *msg = op->goaway_message == NULL
? "null"
: grpc_dump_slice(*op->goaway_message,
GPR_DUMP_ASCII | GPR_DUMP_HEX);
gpr_asprintf(&tmp, "SEND_GOAWAY:status=%d:msg=%s", op->goaway_status, msg);
if (op->goaway_message != NULL) gpr_free(msg);
gpr_strvec_add(&b, tmp);
}
if (op->set_accept_stream) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = false;
gpr_asprintf(&tmp, "SET_ACCEPT_STREAM:%p(%p,...)", op->set_accept_stream_fn,
op->set_accept_stream_user_data);
gpr_strvec_add(&b, tmp);
}
if (op->bind_pollset != NULL) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = false;
gpr_strvec_add(&b, gpr_strdup("BIND_POLLSET"));
}
if (op->bind_pollset_set != NULL) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = false;
gpr_strvec_add(&b, gpr_strdup("BIND_POLLSET_SET"));
}
if (op->send_ping != NULL) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = false;
gpr_strvec_add(&b, gpr_strdup("SEND_PING"));
}
out = gpr_strvec_flatten(&b, NULL);
gpr_strvec_destroy(&b);
return out;
}
static void fill_common_header(const grpc_httpcli_request *request,
gpr_strvec *buf) {
size_t i;
gpr_strvec_add(buf, gpr_strdup(request->http.path));
gpr_strvec_add(buf, gpr_strdup(" HTTP/1.0\r\n"));
/* just in case some crazy server really expects HTTP/1.1 */
gpr_strvec_add(buf, gpr_strdup("Host: "));
gpr_strvec_add(buf, gpr_strdup(request->host));
gpr_strvec_add(buf, gpr_strdup("\r\n"));
gpr_strvec_add(buf, gpr_strdup("Connection: close\r\n"));
gpr_strvec_add(buf,
gpr_strdup("User-Agent: " GRPC_HTTPCLI_USER_AGENT "\r\n"));
/* user supplied headers */
for (i = 0; i < request->http.hdr_count; i++) {
gpr_strvec_add(buf, gpr_strdup(request->http.hdrs[i].key));
gpr_strvec_add(buf, gpr_strdup(": "));
gpr_strvec_add(buf, gpr_strdup(request->http.hdrs[i].value));
gpr_strvec_add(buf, gpr_strdup("\r\n"));
}
}
int main(int argc, char **argv) {
grpc_test_init(argc, argv);
grpc_init();
int errors = 0;
// tests with a minimal stack
grpc_arg minimal_stack_arg = {.type = GRPC_ARG_INTEGER,
.key = GRPC_ARG_MINIMAL_STACK,
.value.integer = 1};
grpc_channel_args minimal_stack_args = {.num_args = 1,
.args = &minimal_stack_arg};
errors += CHECK_STACK("unknown", &minimal_stack_args,
GRPC_CLIENT_DIRECT_CHANNEL, "connected", NULL);
errors += CHECK_STACK("unknown", &minimal_stack_args, GRPC_CLIENT_SUBCHANNEL,
"connected", NULL);
errors += CHECK_STACK("unknown", &minimal_stack_args, GRPC_SERVER_CHANNEL,
"server", "connected", NULL);
errors +=
CHECK_STACK("chttp2", &minimal_stack_args, GRPC_CLIENT_DIRECT_CHANNEL,
"http-client", "connected", NULL);
errors += CHECK_STACK("chttp2", &minimal_stack_args, GRPC_CLIENT_SUBCHANNEL,
"http-client", "connected", NULL);
errors += CHECK_STACK("chttp2", &minimal_stack_args, GRPC_SERVER_CHANNEL,
"server", "http-server", "connected", NULL);
errors += CHECK_STACK(NULL, &minimal_stack_args, GRPC_CLIENT_CHANNEL,
"client-channel", NULL);
// tests with a default stack
errors += CHECK_STACK("unknown", NULL, GRPC_CLIENT_DIRECT_CHANNEL,
"message_size", "deadline", "connected", NULL);
errors += CHECK_STACK("unknown", NULL, GRPC_CLIENT_SUBCHANNEL, "message_size",
"connected", NULL);
errors += CHECK_STACK("unknown", NULL, GRPC_SERVER_CHANNEL, "server",
"message_size", "deadline", "connected", NULL);
errors +=
CHECK_STACK("chttp2", NULL, GRPC_CLIENT_DIRECT_CHANNEL, "message_size",
"deadline", "http-client", "compress", "connected", NULL);
errors += CHECK_STACK("chttp2", NULL, GRPC_CLIENT_SUBCHANNEL, "message_size",
"http-client", "compress", "connected", NULL);
errors +=
CHECK_STACK("chttp2", NULL, GRPC_SERVER_CHANNEL, "server", "message_size",
"deadline", "http-server", "compress", "connected", NULL);
errors +=
CHECK_STACK(NULL, NULL, GRPC_CLIENT_CHANNEL, "client-channel", NULL);
GPR_ASSERT(errors == 0);
grpc_shutdown();
return 0;
}
/*******************************************************************************
* End of tests definitions, start of test infrastructure
*/
static int check_stack(const char *file, int line, const char *transport_name,
grpc_channel_args *init_args,
grpc_channel_stack_type channel_stack_type, ...) {
// create dummy channel stack
grpc_channel_stack_builder *builder = grpc_channel_stack_builder_create();
grpc_transport_vtable fake_transport_vtable = {.name = transport_name};
grpc_transport fake_transport = {.vtable = &fake_transport_vtable};
grpc_channel_stack_builder_set_target(builder, "foo.test.google.fr");
grpc_channel_args *channel_args = grpc_channel_args_copy(init_args);
if (transport_name != NULL) {
grpc_channel_stack_builder_set_transport(builder, &fake_transport);
}
{
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
grpc_channel_stack_builder_set_channel_arguments(&exec_ctx, builder,
channel_args);
GPR_ASSERT(
grpc_channel_init_create_stack(&exec_ctx, builder, channel_stack_type));
grpc_exec_ctx_finish(&exec_ctx);
}
// build up our expectation list
gpr_strvec v;
gpr_strvec_init(&v);
va_list args;
va_start(args, channel_stack_type);
for (;;) {
char *a = va_arg(args, char *);
if (a == NULL) break;
if (v.count != 0) gpr_strvec_add(&v, gpr_strdup(", "));
gpr_strvec_add(&v, gpr_strdup(a));
}
va_end(args);
char *expect = gpr_strvec_flatten(&v, NULL);
gpr_strvec_destroy(&v);
// build up our "got" list
gpr_strvec_init(&v);
grpc_channel_stack_builder_iterator *it =
grpc_channel_stack_builder_create_iterator_at_first(builder);
while (grpc_channel_stack_builder_move_next(it)) {
const char *name = grpc_channel_stack_builder_iterator_filter_name(it);
if (name == NULL) continue;
if (v.count != 0) gpr_strvec_add(&v, gpr_strdup(", "));
gpr_strvec_add(&v, gpr_strdup(name));
}
char *got = gpr_strvec_flatten(&v, NULL);
gpr_strvec_destroy(&v);
grpc_channel_stack_builder_iterator_destroy(it);
// figure out result, log if there's an error
int result = 0;
if (0 != strcmp(got, expect)) {
gpr_strvec_init(&v);
gpr_strvec_add(&v, gpr_strdup("{"));
for (size_t i = 0; i < channel_args->num_args; i++) {
if (i > 0) gpr_strvec_add(&v, gpr_strdup(", "));
gpr_strvec_add(&v, gpr_strdup(channel_args->args[i].key));
gpr_strvec_add(&v, gpr_strdup("="));
switch (channel_args->args[i].type) {
case GRPC_ARG_INTEGER: {
char *tmp;
gpr_asprintf(&tmp, "%d", channel_args->args[i].value.integer);
gpr_strvec_add(&v, tmp);
break;
}
case GRPC_ARG_STRING:
gpr_strvec_add(&v, gpr_strdup(channel_args->args[i].value.string));
break;
case GRPC_ARG_POINTER: {
char *tmp;
gpr_asprintf(&tmp, "%p", channel_args->args[i].value.pointer.p);
gpr_strvec_add(&v, tmp);
break;
}
}
}
gpr_strvec_add(&v, gpr_strdup("}"));
char *args_str = gpr_strvec_flatten(&v, NULL);
gpr_strvec_destroy(&v);
gpr_log(file, line, GPR_LOG_SEVERITY_ERROR,
"**************************************************");
gpr_log(file, line, GPR_LOG_SEVERITY_ERROR,
"FAILED transport=%s; stack_type=%s; channel_args=%s:",
transport_name, grpc_channel_stack_type_string(channel_stack_type),
args_str);
gpr_log(file, line, GPR_LOG_SEVERITY_ERROR, "EXPECTED: %s", expect);
gpr_log(file, line, GPR_LOG_SEVERITY_ERROR, "GOT: %s", got);
result = 1;
gpr_free(args_str);
}
gpr_free(got);
gpr_free(expect);
{
grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
grpc_channel_stack_builder_destroy(&exec_ctx, builder);
grpc_channel_args_destroy(&exec_ctx, channel_args);
grpc_exec_ctx_finish(&exec_ctx);
}
return result;
}
char *grpc_transport_stream_op_string(grpc_transport_stream_op *op) {
char *tmp;
char *out;
int first = 1;
gpr_strvec b;
gpr_strvec_init(&b);
if (op->send_ops) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = 0;
gpr_strvec_add(&b, gpr_strdup("SEND"));
if (op->is_last_send) {
gpr_strvec_add(&b, gpr_strdup("_LAST"));
}
gpr_strvec_add(&b, gpr_strdup("["));
gpr_strvec_add(&b, grpc_sopb_string(op->send_ops));
gpr_strvec_add(&b, gpr_strdup("]"));
}
if (op->recv_ops) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = 0;
gpr_asprintf(&tmp, "RECV:max_recv_bytes=%d", op->max_recv_bytes);
gpr_strvec_add(&b, tmp);
}
if (op->bind_pollset) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = 0;
gpr_strvec_add(&b, gpr_strdup("BIND"));
}
if (op->cancel_with_status != GRPC_STATUS_OK) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = 0;
gpr_asprintf(&tmp, "CANCEL:%d", op->cancel_with_status);
gpr_strvec_add(&b, tmp);
}
if (op->on_consumed != NULL) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = 0;
gpr_asprintf(&tmp, "ON_CONSUMED:%p", op->on_consumed);
gpr_strvec_add(&b, tmp);
}
out = gpr_strvec_flatten(&b, NULL);
gpr_strvec_destroy(&b);
return out;
}
char *grpc_transport_stream_op_string(grpc_transport_stream_op *op) {
char *tmp;
char *out;
int first = 1;
gpr_strvec b;
gpr_strvec_init(&b);
if (op->send_initial_metadata != NULL) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = 0;
gpr_strvec_add(&b, gpr_strdup("SEND_INITIAL_METADATA{"));
put_metadata_list(&b, *op->send_initial_metadata);
gpr_strvec_add(&b, gpr_strdup("}"));
}
if (op->send_message != NULL) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = 0;
gpr_asprintf(&tmp, "SEND_MESSAGE:flags=0x%08x:len=%d",
op->send_message->flags, op->send_message->length);
gpr_strvec_add(&b, tmp);
}
if (op->send_trailing_metadata != NULL) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = 0;
gpr_strvec_add(&b, gpr_strdup("SEND_TRAILING_METADATA{"));
put_metadata_list(&b, *op->send_trailing_metadata);
gpr_strvec_add(&b, gpr_strdup("}"));
}
if (op->recv_initial_metadata != NULL) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = 0;
gpr_strvec_add(&b, gpr_strdup("RECV_INITIAL_METADATA"));
}
if (op->recv_message != NULL) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = 0;
gpr_strvec_add(&b, gpr_strdup("RECV_MESSAGE"));
}
if (op->recv_trailing_metadata != NULL) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = 0;
gpr_strvec_add(&b, gpr_strdup("RECV_TRAILING_METADATA"));
}
if (op->cancel_with_status != GRPC_STATUS_OK) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = 0;
gpr_asprintf(&tmp, "CANCEL:%d", op->cancel_with_status);
gpr_strvec_add(&b, tmp);
}
out = gpr_strvec_flatten(&b, NULL);
gpr_strvec_destroy(&b);
return out;
}
char *grpc_transport_op_string(grpc_transport_op *op) {
char *tmp;
char *out;
int first = 1;
gpr_strvec b;
gpr_strvec_init(&b);
if (op->send_ops) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = 0;
gpr_strvec_add(&b, gpr_strdup("SEND"));
if (op->is_last_send) {
gpr_strvec_add(&b, gpr_strdup("_LAST"));
}
gpr_strvec_add(&b, gpr_strdup("["));
gpr_strvec_add(&b, grpc_sopb_string(op->send_ops));
gpr_strvec_add(&b, gpr_strdup("]"));
}
if (op->recv_ops) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = 0;
gpr_strvec_add(&b, gpr_strdup("RECV"));
}
if (op->bind_pollset) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = 0;
gpr_strvec_add(&b, gpr_strdup("BIND"));
}
if (op->cancel_with_status != GRPC_STATUS_OK) {
if (!first) gpr_strvec_add(&b, gpr_strdup(" "));
first = 0;
gpr_asprintf(&tmp, "CANCEL:%d", op->cancel_with_status);
gpr_strvec_add(&b, tmp);
if (op->cancel_message) {
gpr_asprintf(&tmp, ";msg='%s'",
grpc_mdstr_as_c_string(op->cancel_message));
gpr_strvec_add(&b, tmp);
}
}
out = gpr_strvec_flatten(&b, NULL);
gpr_strvec_destroy(&b);
return out;
}
static void adderr(gpr_strvec *buf, int success) {
char *tmp;
gpr_asprintf(&tmp, " %s", errstr(success));
gpr_strvec_add(buf, tmp);
}
static void addhdr(gpr_strvec *buf, grpc_event *ev) {
char *tmp;
gpr_asprintf(&tmp, "tag:%p", ev->tag);
gpr_strvec_add(buf, tmp);
}