diff options
Diffstat (limited to 'src/core/lib/channel/http_client_filter.c')
| -rw-r--r-- | src/core/lib/channel/http_client_filter.c | 182 |
1 files changed, 170 insertions, 12 deletions
diff --git a/src/core/lib/channel/http_client_filter.c b/src/core/lib/channel/http_client_filter.c index a7a775cc53..ef68cc86ea 100644 --- a/src/core/lib/channel/http_client_filter.c +++ b/src/core/lib/channel/http_client_filter.c @@ -43,6 +43,9 @@ #define EXPECTED_CONTENT_TYPE "application/grpc" #define EXPECTED_CONTENT_TYPE_LENGTH sizeof(EXPECTED_CONTENT_TYPE) - 1 +/* default maximum size of payload eligable for GET request */ +static const size_t kMaxPayloadSizeForGet = 2048; + typedef struct call_data { grpc_linked_mdelem method; grpc_linked_mdelem scheme; @@ -50,20 +53,39 @@ typedef struct call_data { grpc_linked_mdelem te_trailers; grpc_linked_mdelem content_type; grpc_linked_mdelem user_agent; + grpc_linked_mdelem payload_bin; grpc_metadata_batch *recv_initial_metadata; + uint8_t *payload_bytes; + + /* Vars to read data off of send_message */ + grpc_transport_stream_op send_op; + uint32_t send_length; + uint32_t send_flags; + gpr_slice incoming_slice; + grpc_slice_buffer_stream replacement_stream; + gpr_slice_buffer slices; + /* flag that indicates that all slices of send_messages aren't availble */ + bool send_message_blocked; /** Closure to call when finished with the hc_on_recv hook */ grpc_closure *on_done_recv; + grpc_closure *on_complete; + grpc_closure *post_send; + /** Receive closures are chained: we inject this closure as the on_done_recv up-call on transport_op, and remember to call our on_done_recv member after handling it. */ grpc_closure hc_on_recv; + grpc_closure hc_on_complete; + grpc_closure got_slice; + grpc_closure send_done; } call_data; typedef struct channel_data { grpc_mdelem *static_scheme; grpc_mdelem *user_agent; + size_t max_payload_size_for_get; } channel_data; typedef struct { @@ -119,6 +141,24 @@ static void hc_on_recv(grpc_exec_ctx *exec_ctx, void *user_data, calld->on_done_recv->cb(exec_ctx, calld->on_done_recv->cb_arg, error); } +static void hc_on_complete(grpc_exec_ctx *exec_ctx, void *user_data, + grpc_error *error) { + grpc_call_element *elem = user_data; + call_data *calld = elem->call_data; + if (calld->payload_bytes) { + gpr_free(calld->payload_bytes); + calld->payload_bytes = NULL; + } + calld->on_complete->cb(exec_ctx, calld->on_complete->cb_arg, error); +} + +static void send_done(grpc_exec_ctx *exec_ctx, void *elemp, grpc_error *error) { + grpc_call_element *elem = elemp; + call_data *calld = elem->call_data; + gpr_slice_buffer_reset_and_unref(&calld->slices); + calld->post_send->cb(exec_ctx, calld->post_send->cb_arg, error); +} + static grpc_mdelem *client_strip_filter(void *user_data, grpc_mdelem *md) { /* eat the things we'd like to set ourselves */ if (md->key == GRPC_MDSTR_METHOD) return NULL; @@ -129,22 +169,105 @@ static grpc_mdelem *client_strip_filter(void *user_data, grpc_mdelem *md) { return md; } -static void hc_mutate_op(grpc_call_element *elem, +static void continue_send_message(grpc_exec_ctx *exec_ctx, + grpc_call_element *elem) { + call_data *calld = elem->call_data; + uint8_t *wrptr = calld->payload_bytes; + while (grpc_byte_stream_next(exec_ctx, calld->send_op.send_message, + &calld->incoming_slice, ~(size_t)0, + &calld->got_slice)) { + memcpy(wrptr, GPR_SLICE_START_PTR(calld->incoming_slice), + GPR_SLICE_LENGTH(calld->incoming_slice)); + wrptr += GPR_SLICE_LENGTH(calld->incoming_slice); + gpr_slice_buffer_add(&calld->slices, calld->incoming_slice); + if (calld->send_length == calld->slices.length) { + calld->send_message_blocked = false; + break; + } + } +} + +static void got_slice(grpc_exec_ctx *exec_ctx, void *elemp, grpc_error *error) { + grpc_call_element *elem = elemp; + call_data *calld = elem->call_data; + calld->send_message_blocked = false; + gpr_slice_buffer_add(&calld->slices, calld->incoming_slice); + if (calld->send_length == calld->slices.length) { + /* Pass down the original send_message op that was blocked.*/ + grpc_slice_buffer_stream_init(&calld->replacement_stream, &calld->slices, + calld->send_flags); + calld->send_op.send_message = &calld->replacement_stream.base; + calld->post_send = calld->send_op.on_complete; + calld->send_op.on_complete = &calld->send_done; + grpc_call_next_op(exec_ctx, elem, &calld->send_op); + } else { + continue_send_message(exec_ctx, elem); + } +} + +static void hc_mutate_op(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, grpc_transport_stream_op *op) { /* grab pointers to our data from the call element */ call_data *calld = elem->call_data; channel_data *channeld = elem->channel_data; + if (op->send_initial_metadata != NULL) { + /* Decide which HTTP VERB to use. We use GET if the request is marked + cacheable, and the operation contains both initial metadata and send + message, and the payload is below the size threshold, and all the data + for this request is immediately available. */ + grpc_mdelem *method = GRPC_MDELEM_METHOD_POST; + calld->send_message_blocked = false; + if ((op->send_initial_metadata_flags & + GRPC_INITIAL_METADATA_CACHEABLE_REQUEST) && + op->send_message != NULL && + op->send_message->length < channeld->max_payload_size_for_get) { + method = GRPC_MDELEM_METHOD_GET; + calld->send_message_blocked = true; + } else if (op->send_initial_metadata_flags & + GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST) { + method = GRPC_MDELEM_METHOD_PUT; + } + + /* Attempt to read the data from send_message and create a header field. */ + if (method == GRPC_MDELEM_METHOD_GET) { + /* allocate memory to hold the entire payload */ + calld->payload_bytes = gpr_malloc(op->send_message->length); + GPR_ASSERT(calld->payload_bytes); + + /* read slices of send_message and copy into payload_bytes */ + calld->send_op = *op; + calld->send_length = op->send_message->length; + calld->send_flags = op->send_message->flags; + continue_send_message(exec_ctx, elem); + + if (calld->send_message_blocked == false) { + /* when all the send_message data is available, then create a MDELEM and + append to headers */ + grpc_mdelem *payload_bin = grpc_mdelem_from_metadata_strings( + GRPC_MDSTR_GRPC_PAYLOAD_BIN, + grpc_mdstr_from_buffer(calld->payload_bytes, + op->send_message->length)); + grpc_metadata_batch_add_tail(op->send_initial_metadata, + &calld->payload_bin, payload_bin); + calld->on_complete = op->on_complete; + op->on_complete = &calld->hc_on_complete; + op->send_message = NULL; + } else { + /* Not all data is available. Fall back to POST. */ + gpr_log(GPR_DEBUG, + "Request is marked Cacheable but not all data is available.\ + Falling back to POST"); + method = GRPC_MDELEM_METHOD_POST; + } + } + grpc_metadata_batch_filter(op->send_initial_metadata, client_strip_filter, elem); /* Send : prefixed headers, which have to be before any application layer headers. */ - grpc_metadata_batch_add_head( - op->send_initial_metadata, &calld->method, - op->send_initial_metadata_flags & - GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST - ? GRPC_MDELEM_METHOD_PUT - : GRPC_MDELEM_METHOD_POST); + grpc_metadata_batch_add_head(op->send_initial_metadata, &calld->method, + method); grpc_metadata_batch_add_head(op->send_initial_metadata, &calld->scheme, channeld->static_scheme); grpc_metadata_batch_add_tail(op->send_initial_metadata, &calld->te_trailers, @@ -169,9 +292,16 @@ static void hc_start_transport_op(grpc_exec_ctx *exec_ctx, grpc_transport_stream_op *op) { GPR_TIMER_BEGIN("hc_start_transport_op", 0); GRPC_CALL_LOG_OP(GPR_INFO, elem, op); - hc_mutate_op(elem, op); + hc_mutate_op(exec_ctx, elem, op); GPR_TIMER_END("hc_start_transport_op", 0); - grpc_call_next_op(exec_ctx, elem, op); + call_data *calld = elem->call_data; + if (op->send_message != NULL && calld->send_message_blocked) { + /* Don't forward the op. send_message contains slices that aren't ready + yet. The call will be forwarded by the op_complete of slice read call. + */ + } else { + grpc_call_next_op(exec_ctx, elem, op); + } } /* Constructor for call_data */ @@ -180,14 +310,23 @@ static grpc_error *init_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element_args *args) { call_data *calld = elem->call_data; calld->on_done_recv = NULL; + calld->on_complete = NULL; + calld->payload_bytes = NULL; + gpr_slice_buffer_init(&calld->slices); grpc_closure_init(&calld->hc_on_recv, hc_on_recv, elem); + grpc_closure_init(&calld->hc_on_complete, hc_on_complete, elem); + grpc_closure_init(&calld->got_slice, got_slice, elem); + grpc_closure_init(&calld->send_done, send_done, elem); return GRPC_ERROR_NONE; } /* Destructor for call_data */ static void destroy_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, const grpc_call_final_info *final_info, - void *ignored) {} + void *ignored) { + call_data *calld = elem->call_data; + gpr_slice_buffer_destroy(&calld->slices); +} static grpc_mdelem *scheme_from_args(const grpc_channel_args *args) { unsigned i; @@ -210,6 +349,22 @@ static grpc_mdelem *scheme_from_args(const grpc_channel_args *args) { return GRPC_MDELEM_SCHEME_HTTP; } +static size_t max_payload_size_from_args(const grpc_channel_args *args) { + if (args != NULL) { + for (size_t i = 0; i < args->num_args; ++i) { + if (0 == strcmp(args->args[i].key, GRPC_ARG_MAX_PAYLOAD_SIZE_FOR_GET)) { + if (args->args[i].type != GRPC_ARG_INTEGER) { + gpr_log(GPR_ERROR, "%s: must be an integer", + GRPC_ARG_MAX_PAYLOAD_SIZE_FOR_GET); + } else { + return (size_t)args->args[i].value.integer; + } + } + } + } + return kMaxPayloadSizeForGet; +} + static grpc_mdstr *user_agent_from_args(const grpc_channel_args *args, const char *transport_name) { gpr_strvec v; @@ -233,8 +388,9 @@ static grpc_mdstr *user_agent_from_args(const grpc_channel_args *args, } } - gpr_asprintf(&tmp, "%sgrpc-c/%s (%s; %s)", is_first ? "" : " ", - grpc_version_string(), GPR_PLATFORM_STRING, transport_name); + gpr_asprintf(&tmp, "%sgrpc-c/%s (%s; %s; %s)", is_first ? "" : " ", + grpc_version_string(), GPR_PLATFORM_STRING, transport_name, + grpc_g_stands_for()); is_first = 0; gpr_strvec_add(&v, tmp); @@ -267,6 +423,8 @@ static void init_channel_elem(grpc_exec_ctx *exec_ctx, GPR_ASSERT(!args->is_last); GPR_ASSERT(args->optional_transport != NULL); chand->static_scheme = scheme_from_args(args->channel_args); + chand->max_payload_size_for_get = + max_payload_size_from_args(args->channel_args); chand->user_agent = grpc_mdelem_from_metadata_strings( GRPC_MDSTR_USER_AGENT, user_agent_from_args(args->channel_args, |