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