Simplified distributed block storage with strong consistency, like in Ceph
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// Copyright (c) Vitaliy Filippov, 2019+
// License: VNPL-1.1 (see README.md for details)
#include <ctype.h>
#include "cli.h"
#include "cluster_client.h"
#include "base64.h"
#include <algorithm>
// Safely allocate an OSD number
struct alloc_osd_t
{
cli_tool_t *parent;
uint64_t new_id = 1;
int state = 0;
cli_result_t result;
bool is_done()
{
return state == 100;
}
void loop()
{
if (state == 1)
goto resume_1;
do
{
parent->etcd_txn(json11::Json::object {
{ "compare", json11::Json::array {
json11::Json::object {
{ "target", "VERSION" },
{ "version", 0 },
{ "key", base64_encode(
parent->cli->st_cli.etcd_prefix+"/osd/stats/"+std::to_string(new_id)
) },
},
} },
{ "success", json11::Json::array {
json11::Json::object {
{ "request_put", json11::Json::object {
{ "key", base64_encode(
parent->cli->st_cli.etcd_prefix+"/osd/stats/"+std::to_string(new_id)
) },
{ "value", base64_encode("{}") },
} },
},
} },
{ "failure", json11::Json::array {
json11::Json::object {
{ "request_range", json11::Json::object {
{ "key", base64_encode(parent->cli->st_cli.etcd_prefix+"/osd/stats/") },
{ "range_end", base64_encode(parent->cli->st_cli.etcd_prefix+"/osd/stats0") },
{ "keys_only", true },
} },
},
} },
});
resume_1:
state = 1;
if (parent->waiting > 0)
return;
if (parent->etcd_err.err)
{
result = parent->etcd_err;
state = 100;
return;
}
if (!parent->etcd_result["succeeded"].bool_value())
{
std::vector<osd_num_t> used;
for (auto kv: parent->etcd_result["responses"][0]["response_range"]["kvs"].array_items())
{
std::string key = base64_decode(kv["key"].string_value());
osd_num_t cur_osd;
char null_byte = 0;
sscanf(key.c_str() + parent->cli->st_cli.etcd_prefix.length(), "/osd/stats/%lu%c", &cur_osd, &null_byte);
if (!cur_osd || null_byte != 0)
{
fprintf(stderr, "Invalid key in etcd: %s\n", key.c_str());
continue;
}
used.push_back(cur_osd);
}
std::sort(used.begin(), used.end());
if (used[used.size()-1] == used.size())
{
new_id = used.size()+1;
}
else
{
int s = 0, e = used.size();
while (e > s+1)
{
int c = (s+e)/2;
if (used[c] == c+1)
s = c;
else
e = c;
}
new_id = used[e-1]+1;
}
}
} while (!parent->etcd_result["succeeded"].bool_value());
state = 100;
result = (cli_result_t){
.text = std::to_string(new_id),
.data = json11::Json(new_id),
};
}
};
std::function<bool(cli_result_t &)> cli_tool_t::start_alloc_osd(json11::Json cfg)
{
auto alloc_osd = new alloc_osd_t();
alloc_osd->parent = this;
return [alloc_osd](cli_result_t & result)
{
alloc_osd->loop();
if (alloc_osd->is_done())
{
result = alloc_osd->result;
delete alloc_osd;
return true;
}
return false;
};
}