/
exists.cc
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/
exists.cc
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/* -*- Mode: C; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright 2019-2020 Couchbase, Inc.
*
* 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 "internal.h"
#include "collections.h"
#include "trace.h"
LIBCOUCHBASE_API lcb_STATUS lcb_respexists_status(const lcb_RESPEXISTS *resp)
{
return resp->ctx.rc == LCB_ERR_DOCUMENT_NOT_FOUND ? LCB_SUCCESS : resp->ctx.rc;
}
LIBCOUCHBASE_API int lcb_respexists_is_found(const lcb_RESPEXISTS *resp)
{
return resp->ctx.rc == LCB_SUCCESS && !resp->deleted;
}
LIBCOUCHBASE_API lcb_STATUS lcb_respexists_error_context(const lcb_RESPEXISTS *resp,
const lcb_KEY_VALUE_ERROR_CONTEXT **ctx)
{
if (resp->rflags & LCB_RESP_F_ERRINFO) {
lcb_RESPEXISTS *mut = const_cast<lcb_RESPEXISTS *>(resp);
mut->ctx.context = lcb_resp_get_error_context(LCB_CALLBACK_EXISTS, (const lcb_RESPBASE *)resp);
if (mut->ctx.context) {
mut->ctx.context_len = strlen(resp->ctx.context);
}
mut->ctx.ref = lcb_resp_get_error_ref(LCB_CALLBACK_EXISTS, (const lcb_RESPBASE *)resp);
if (mut->ctx.ref) {
mut->ctx.ref_len = strlen(resp->ctx.ref);
}
}
*ctx = &resp->ctx;
return LCB_SUCCESS;
}
LIBCOUCHBASE_API lcb_STATUS lcb_respexists_cookie(const lcb_RESPEXISTS *resp, void **cookie)
{
*cookie = resp->cookie;
return LCB_SUCCESS;
}
LIBCOUCHBASE_API lcb_STATUS lcb_respexists_cas(const lcb_RESPEXISTS *resp, uint64_t *cas)
{
*cas = resp->ctx.cas;
return LCB_SUCCESS;
}
LIBCOUCHBASE_API lcb_STATUS lcb_respexists_key(const lcb_RESPEXISTS *resp, const char **key, size_t *key_len)
{
*key = (const char *)resp->ctx.key;
*key_len = resp->ctx.key_len;
return LCB_SUCCESS;
}
LIBCOUCHBASE_API lcb_STATUS lcb_respexists_mutation_token(const lcb_RESPEXISTS *resp, lcb_MUTATION_TOKEN *token)
{
const lcb_MUTATION_TOKEN *mt = lcb_resp_get_mutation_token(LCB_CALLBACK_EXISTS, (const lcb_RESPBASE *)resp);
if (token && mt) {
*token = *mt;
}
return LCB_SUCCESS;
}
LIBCOUCHBASE_API lcb_STATUS lcb_cmdexists_create(lcb_CMDEXISTS **cmd)
{
*cmd = (lcb_CMDEXISTS *)calloc(1, sizeof(lcb_CMDEXISTS));
return LCB_SUCCESS;
}
LIBCOUCHBASE_API lcb_STATUS lcb_cmdexists_clone(const lcb_CMDEXISTS *cmd, lcb_CMDEXISTS **copy)
{
LCB_CMD_CLONE(lcb_CMDEXISTS, cmd, copy);
return LCB_SUCCESS;
}
LIBCOUCHBASE_API lcb_STATUS lcb_cmdexists_destroy(lcb_CMDEXISTS *cmd)
{
LCB_CMD_DESTROY_CLONE(cmd);
return LCB_SUCCESS;
}
LIBCOUCHBASE_API lcb_STATUS lcb_cmdexists_timeout(lcb_CMDEXISTS *cmd, uint32_t timeout)
{
cmd->timeout = timeout;
return LCB_SUCCESS;
}
LIBCOUCHBASE_API lcb_STATUS lcb_cmdexists_parent_span(lcb_CMDEXISTS *cmd, lcbtrace_SPAN *span)
{
cmd->pspan = span;
return LCB_SUCCESS;
}
LIBCOUCHBASE_API lcb_STATUS lcb_cmdexists_collection(lcb_CMDEXISTS *cmd, const char *scope, size_t scope_len,
const char *collection, size_t collection_len)
{
cmd->scope = scope;
cmd->nscope = scope_len;
cmd->collection = collection;
cmd->ncollection = collection_len;
return LCB_SUCCESS;
}
LIBCOUCHBASE_API lcb_STATUS lcb_cmdexists_key(lcb_CMDEXISTS *cmd, const char *key, size_t key_len)
{
LCB_CMD_SET_KEY(cmd, key, key_len);
return LCB_SUCCESS;
}
static lcb_STATUS exists_validate(lcb_INSTANCE *instance, const lcb_CMDEXISTS *cmd)
{
if (LCB_KEYBUF_IS_EMPTY(&cmd->key)) {
return LCB_ERR_EMPTY_KEY;
}
if (!instance->cmdq.config) {
return LCB_ERR_NO_CONFIGURATION;
}
return LCB_SUCCESS;
}
LIBCOUCHBASE_API
lcb_STATUS lcb_exists(lcb_INSTANCE *instance, void *cookie, const lcb_CMDEXISTS *command)
{
lcb_STATUS rc;
rc = exists_validate(instance, command);
if (rc != LCB_SUCCESS) {
return rc;
}
auto operation = [instance, cookie](const lcb_RESPGETCID *resp, const lcb_CMDEXISTS *cmd) {
if (resp && resp->ctx.rc != LCB_SUCCESS) {
lcb_RESPCALLBACK cb = lcb_find_callback(instance, LCB_CALLBACK_EXISTS);
lcb_RESPEXISTS ext{};
ext.ctx = resp->ctx;
ext.ctx.key = static_cast<const char *>(cmd->key.contig.bytes);
ext.ctx.key_len = cmd->key.contig.nbytes;
ext.cookie = cookie;
cb(instance, LCB_CALLBACK_EXISTS, reinterpret_cast<const lcb_RESPBASE *>(&ext));
return resp->ctx.rc;
}
mc_CMDQUEUE *cq = &instance->cmdq;
protocol_binary_request_header hdr;
mc_PIPELINE *pipeline;
mc_PACKET *pkt;
lcb_STATUS err;
err = mcreq_basic_packet(cq, (const lcb_CMDBASE *)cmd, &hdr, 0, 0, &pkt, &pipeline,
MCREQ_BASICPACKET_F_FALLBACKOK);
if (err != LCB_SUCCESS) {
return err;
}
hdr.request.opcode = PROTOCOL_BINARY_CMD_GET_META;
hdr.request.datatype = PROTOCOL_BINARY_RAW_BYTES;
hdr.request.bodylen = htonl(ntohs(hdr.request.keylen));
hdr.request.opaque = pkt->opaque;
hdr.request.cas = 0;
pkt->u_rdata.reqdata.cookie = cookie;
pkt->u_rdata.reqdata.start = gethrtime();
pkt->u_rdata.reqdata.deadline =
pkt->u_rdata.reqdata.start +
LCB_US2NS(cmd->timeout ? cmd->timeout : LCBT_SETTING(instance, operation_timeout));
memcpy(SPAN_BUFFER(&pkt->kh_span), hdr.bytes, MCREQ_PKT_BASESIZE);
LCB_SCHED_ADD(instance, pipeline, pkt);
LCBTRACE_KV_START(instance->settings, cmd, LCBTRACE_OP_EXISTS, pkt->opaque, pkt->u_rdata.reqdata.span);
TRACE_EXISTS_BEGIN(instance, &hdr, cmd);
return LCB_SUCCESS;
};
if (!LCBT_SETTING(instance, use_collections)) {
/* fast path if collections are not enabled */
return operation(nullptr, command);
}
uint32_t cid = 0;
if (collcache_get(instance, command->scope, command->nscope, command->collection, command->ncollection, &cid) ==
LCB_SUCCESS) {
lcb_CMDEXISTS clone = *command; /* shallow clone */
clone.cid = cid;
return operation(nullptr, &clone);
} else {
return collcache_resolve(instance, command, operation, lcb_cmdexists_clone, lcb_cmdexists_destroy);
}
}