fix agent hot-reload issue and added list agents endpoint

internal/config/agent_pool.go

@@ -0,0 +1,38 @@
+package config
+
+import (
+	"errors"
+
+	"github.com/yusing/go-proxy/agent/pkg/agent"
+	"github.com/yusing/go-proxy/internal/utils/functional"
+)
+
+var agentPool = functional.NewMapOf[string, *agent.AgentConfig]()
+
+func addAgent(agent *agent.AgentConfig) {
+	agentPool.Store(agent.Addr, agent)
+}
+
+func removeAllAgents() {
+	agentPool.Clear()
+}
+
+func GetAgent(addr string) (agent *agent.AgentConfig, ok bool) {
+	agent, ok = agentPool.Load(addr)
+	return
+}
+
+func (cfg *Config) GetAgent(agentDockerHost string) (*agent.AgentConfig, bool) {
+	if !agent.IsDockerHostAgent(agentDockerHost) {
+		panic(errors.New("invalid use of GetAgent with docker host: " + agentDockerHost))
+	}
+	return GetAgent(agent.GetAgentAddrFromDockerHost(agentDockerHost))
+}
+
+func (cfg *Config) ListAgents() []*agent.AgentConfig {
+	agents := make([]*agent.AgentConfig, 0, agentPool.Size())
+	agentPool.RangeAll(func(key string, value *agent.AgentConfig) {
+		agents = append(agents, value)
+	})
+	return agents
+}