Change sockaddr resolver to allow setting method config via URI query params.

1 files changed, 64 insertions, 19 deletions

diff --git a/src/core/ext/resolver/sockaddr/sockaddr_resolver.c b/src/core/ext/resolver/sockaddr/sockaddr_resolver.c
index 74d2015e5c..98e22f0f63 100644
--- a/src/core/ext/resolver/sockaddr/sockaddr_resolver.c
+++ b/src/core/ext/resolver/sockaddr/sockaddr_resolver.c
@@ -33,6 +33,7 @@
 
 #include <stdbool.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include <grpc/support/alloc.h>
@@ -40,8 +41,10 @@
 #include <grpc/support/port_platform.h>
 #include <grpc/support/string_util.h>
 
+#include "src/core/ext/client_config/method_config.h"
 #include "src/core/ext/client_config/parse_address.h"
 #include "src/core/ext/client_config/resolver_registry.h"
+#include "src/core/lib/channel/channel_args.h"
 #include "src/core/lib/iomgr/resolve_address.h"
 #include "src/core/lib/iomgr/unix_sockets_posix.h"
 #include "src/core/lib/support/string.h"
@@ -53,6 +56,8 @@ typedef struct {
   gpr_refcount refs;
   /** load balancing policy name */
   char *lb_policy_name;
+  /** method config table */
+  grpc_method_config_table *method_config_table;
 
   /** the addresses that we've 'resolved' */
   grpc_lb_addresses *addresses;
@@ -120,9 +125,15 @@ static void sockaddr_maybe_finish_next_locked(grpc_exec_ctx *exec_ctx,
                                               sockaddr_resolver *r) {
   if (r->next_completion != NULL && !r->published) {
     r->published = true;
+    grpc_channel_args *lb_policy_args = NULL;
+    if (r->method_config_table != NULL) {
+      const grpc_arg arg = grpc_method_config_table_create_channel_arg(
+          r->method_config_table);
+      lb_policy_args = grpc_channel_args_copy_and_add(NULL /* src */, &arg, 1);
+    }
     *r->target_result = grpc_resolver_result_create(
         "", grpc_lb_addresses_copy(r->addresses, NULL /* user_data_copy */),
-        r->lb_policy_name, NULL);
+        r->lb_policy_name, lb_policy_args);
     grpc_exec_ctx_sched(exec_ctx, r->next_completion, GRPC_ERROR_NONE, NULL);
     r->next_completion = NULL;
   }
@@ -133,6 +144,7 @@ static void sockaddr_destroy(grpc_exec_ctx *exec_ctx, grpc_resolver *gr) {
   gpr_mu_destroy(&r->mu);
   grpc_lb_addresses_destroy(r->addresses, NULL /* user_data_destroy */);
   gpr_free(r->lb_policy_name);
+  grpc_method_config_table_unref(r->method_config_table);
   gpr_free(r);
 }
 
@@ -164,30 +176,29 @@ static void do_nothing(void *ignored) {}
 static grpc_resolver *sockaddr_create(
     grpc_resolver_args *args, const char *default_lb_policy_name,
     int parse(grpc_uri *uri, struct sockaddr_storage *dst, size_t *len)) {
-  bool errors_found = false;
-  sockaddr_resolver *r;
-  gpr_slice path_slice;
-  gpr_slice_buffer path_parts;
-
   if (0 != strcmp(args->uri->authority, "")) {
     gpr_log(GPR_ERROR, "authority based uri's not supported by the %s scheme",
             args->uri->scheme);
     return NULL;
   }
 
-  r = gpr_malloc(sizeof(sockaddr_resolver));
+  sockaddr_resolver *r = gpr_malloc(sizeof(sockaddr_resolver));
   memset(r, 0, sizeof(*r));
 
+  // Initialize LB policy name.
   r->lb_policy_name =
       gpr_strdup(grpc_uri_get_query_arg(args->uri, "lb_policy"));
+  if (r->lb_policy_name == NULL) {
+    r->lb_policy_name = gpr_strdup(default_lb_policy_name);
+  }
+
+  // Get lb_enabled arg.
   const char *lb_enabled_qpart =
       grpc_uri_get_query_arg(args->uri, "lb_enabled");
-  /* anything other than "0" is interpreted as true */
+  // Anything other than "0" is interpreted as true.
   const bool lb_enabled =
-      (lb_enabled_qpart != NULL && (strcmp("0", lb_enabled_qpart) != 0));
-
-  if (r->lb_policy_name != NULL && strcmp("grpclb", r->lb_policy_name) == 0 &&
-      !lb_enabled) {
+      lb_enabled_qpart != NULL && strcmp("0", lb_enabled_qpart) != 0;
+  if (strcmp("grpclb", r->lb_policy_name) == 0 && !lb_enabled) {
     /* we want grpclb but the "resolved" addresses aren't LB enabled. Bail
      * out, as this is meant mostly for tests. */
     gpr_log(GPR_ERROR,
@@ -196,16 +207,14 @@ static grpc_resolver *sockaddr_create(
     abort();
   }
 
-  if (r->lb_policy_name == NULL) {
-    r->lb_policy_name = gpr_strdup(default_lb_policy_name);
-  }
-
-  path_slice =
+  // Construct addresses.
+  gpr_slice path_slice =
       gpr_slice_new(args->uri->path, strlen(args->uri->path), do_nothing);
+  gpr_slice_buffer path_parts;
   gpr_slice_buffer_init(&path_parts);
-
   gpr_slice_split(path_slice, ",", &path_parts);
   r->addresses = grpc_lb_addresses_create(path_parts.count);
+  bool errors_found = false;
   for (size_t i = 0; i < r->addresses->num_addresses; i++) {
     grpc_uri ith_uri = *args->uri;
     char *part_str = gpr_dump_slice(path_parts.slices[i], GPR_DUMP_ASCII);
@@ -219,7 +228,6 @@ static grpc_resolver *sockaddr_create(
     r->addresses->addresses[i].is_balancer = lb_enabled;
     if (errors_found) break;
   }
-
   gpr_slice_buffer_destroy(&path_parts);
   gpr_slice_unref(path_slice);
   if (errors_found) {
@@ -229,6 +237,43 @@ static grpc_resolver *sockaddr_create(
     return NULL;
   }
 
+  // Construct method config table.
+  // We only support parameters for a single method.
+  const char *method_name = grpc_uri_get_query_arg(args->uri, "method_name");
+  if (method_name != NULL) {
+    const char *wait_for_ready_str =
+        grpc_uri_get_query_arg(args->uri, "wait_for_ready");
+    // Anything other than "0" is interpreted as true.
+    bool wait_for_ready =
+        wait_for_ready_str != NULL && strcmp("0", wait_for_ready_str) != 0;
+    const char* timeout_str =
+        grpc_uri_get_query_arg(args->uri, "timeout_seconds");
+    gpr_timespec timeout = {
+        timeout_str == NULL ? 0 : atoi(timeout_str), 0, GPR_CLOCK_MONOTONIC};
+    const char* max_request_message_bytes_str =
+        grpc_uri_get_query_arg(args->uri, "max_request_message_bytes");
+    int32_t max_request_message_bytes =
+        max_request_message_bytes_str == NULL
+        ? 0 : atoi(max_request_message_bytes_str);
+    const char* max_response_message_bytes_str =
+        grpc_uri_get_query_arg(args->uri, "max_response_message_bytes");
+    int32_t max_response_message_bytes =
+        max_response_message_bytes_str == NULL
+        ? 0 : atoi(max_response_message_bytes_str);
+    grpc_method_config *method_config = grpc_method_config_create(
+        wait_for_ready_str == NULL ? NULL : &wait_for_ready,
+        timeout_str == NULL ? NULL : &timeout,
+        max_request_message_bytes_str == NULL
+            ? NULL : &max_request_message_bytes,
+        max_response_message_bytes_str == NULL
+            ? NULL : &max_response_message_bytes);
+    grpc_method_config_table_entry entry = {
+        grpc_mdstr_from_string(method_name), method_config};
+    r->method_config_table = grpc_method_config_table_create(1, &entry);
+    GRPC_MDSTR_UNREF(entry.method_name);
+    grpc_method_config_unref(method_config);
+  }
+
   gpr_ref_init(&r->refs, 1);
   gpr_mu_init(&r->mu);
   grpc_resolver_init(&r->base, &sockaddr_resolver_vtable);