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ConfigServer+LibConfig: Add way for clients to listen for config changes
This patch adds a Config::Listener abstract class that anyone can inherit from and receive notifications when configuration values change. We don't yet monitor file system changes, so these only work for changes made by ConfigServer itself. In order to receive these notifications, clients must monitor the domain by calling monitor_domain(). Only pledged domains can be monitored. Note that the client initiating the change does not get notified.
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9 changed files with 188 additions and 15 deletions
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@ -22,6 +22,7 @@ class Client final
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public:
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void pledge_domains(Vector<String> const&);
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void monitor_domain(String const&);
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String read_string(StringView domain, StringView group, StringView key, StringView fallback);
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i32 read_i32(StringView domain, StringView group, StringView key, i32 fallback);
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@ -38,6 +39,10 @@ private:
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: IPC::ServerConnection<ConfigClientEndpoint, ConfigServerEndpoint>(*this, "/tmp/portal/config")
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{
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}
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void notify_changed_string_value(String const& domain, String const& group, String const& key, String const& value) override;
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void notify_changed_i32_value(String const& domain, String const& group, String const& key, i32 value) override;
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void notify_changed_bool_value(String const& domain, String const& group, String const& key, bool value) override;
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};
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inline String read_string(StringView domain, StringView group, StringView key, StringView fallback = {})
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@ -80,4 +85,9 @@ inline void pledge_domains(String const& domains)
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Client::the().pledge_domains({ domains });
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}
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inline void monitor_domain(String const& domain)
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{
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Client::the().monitor_domain(domain);
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}
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}
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