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ircd::conf: Add __APPEND/__PREPEND features for non-overwriting from env var.

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This commit is contained in:
Jason Volk 2021-12-19 14:59:14 -08:00
parent c74cfd8088
commit a8e7a4890f
1 changed files with 112 additions and 8 deletions
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120
ircd/conf.cc
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@ -343,7 +343,10 @@ const
namespace ircd::conf
{
static string_view make_env_name(const mutable_buffer &, const item<void> &, const string_view &);
static string_view make_env_name(const mutable_buffer &, const item<void> &);
static void prepend_from_env(item<void> &) noexcept;
static void append_from_env(item<void> &) noexcept;
static void set_from_env(item<void> &) noexcept;
static void set_from_closure(item<void> &) noexcept;
}
@ -356,9 +359,17 @@ ircd::conf::item<void>::call_init()
// to be replaced with a better one (i.e reading a saved value from DB).
conf::set_from_closure(*this);
// Environmental variables now get the final say; this allows any
// Environment variables now get the final say; this allows any
// misconfiguration to be overridden by env vars. The variable name is
// the conf item name with any '.' replaced to '_', case is preserved.
// Prepend to item's current value from env.
conf::prepend_from_env(*this);
// Append to item's current value from env.
conf::append_from_env(*this);
// Overwrite item's value if env is set.
conf::set_from_env(*this);
}
@ -379,33 +390,126 @@ catch(const std::exception &e)
}
void
ircd::conf::set_from_env(item<void> &item)
ircd::conf::prepend_from_env(item<void> &item)
noexcept try
{
thread_local char buf[conf::NAME_MAX_LEN];
const string_view key
const auto key
{
make_env_name(buf, item)
make_env_name(buf, item, "PREPEND")
};
const string_view val
const auto env
{
util::getenv(key)
};
if(!empty(val))
item.set(val);
if(empty(env))
return;
auto val
{
item.get()
};
val = std::string{env} + val;
item.set(val);
}
catch(const std::exception &e)
{
log::error
{
"conf item[%s] environmental variable :%s",
"conf item[%s] prepending from environment variable :%s",
item.name,
e.what()
};
}
void
ircd::conf::append_from_env(item<void> &item)
noexcept try
{
thread_local char buf[conf::NAME_MAX_LEN];
const auto key
{
make_env_name(buf, item, "APPEND")
};
const auto env
{
util::getenv(key)
};
if(empty(env))
return;
auto val
{
item.get()
};
val += env;
item.set(val);
}
catch(const std::exception &e)
{
log::error
{
"conf item[%s] appending from environment variable :%s",
item.name,
e.what()
};
}
void
ircd::conf::set_from_env(item<void> &item)
noexcept try
{
thread_local char buf[conf::NAME_MAX_LEN];
const auto key
{
make_env_name(buf, item)
};
const auto val
{
util::getenv(key)
};
if(empty(val) && !null(val))
return;
item.set(val);
}
catch(const std::exception &e)
{
log::error
{
"conf item[%s] setting from environment variable :%s",
item.name,
e.what()
};
}
ircd::string_view
ircd::conf::make_env_name(const mutable_buffer &buf,
const item<void> &item,
const string_view &feature)
{
thread_local char tmp[conf::NAME_MAX_LEN];
const auto name
{
make_env_name(tmp, item)
};
return fmt::sprintf
{
buf, "%s__%s",
name,
feature,
};
}
ircd::string_view
ircd::conf::make_env_name(const mutable_buffer &buf,
const item<void> &item)