Configuration format v1 (#1230)

* Initial pass at refactoring config (not finished)

* Don't forget current state and EDU servers

* More shifting around

* Update server key API tests

* Fix roomserver test

* Fix more tests

* Further tweaks

* Fix current state server test (sort of)

* Maybe fix appservices

* Fix client API test

* Include database connection string in database options

* Fix sync API build

* Update config test

* Fix unit tests

* Fix federation sender build

* Fix gobind build

* Set Listen address for all services in HTTP monolith mode

* Validate config, reinstate appservice derived in directory, tweaks

* Tweak federation API test

* Set MaxOpenConnections/MaxIdleConnections to previous values

* Update generate-config

internal/config/config_federationsender.go

@@ -0,0 +1,64 @@
+package config
+
+type FederationSender struct {
+	Matrix *Global `yaml:"-"`
+
+	Listen Address `yaml:"listen"`
+	Bind   Address `yaml:"bind"`
+
+	// The FederationSender database stores information used by the FederationSender
+	// It is only accessed by the FederationSender.
+	Database DatabaseOptions `yaml:"database"`
+
+	// Federation failure threshold. How many consecutive failures that we should
+	// tolerate when sending federation requests to a specific server. The backoff
+	// is 2**x seconds, so 1 = 2 seconds, 2 = 4 seconds, 3 = 8 seconds, etc.
+	// The default value is 16 if not specified, which is circa 18 hours.
+	FederationMaxRetries uint32 `yaml:"send_max_retries"`
+
+	// FederationDisableTLSValidation disables the validation of X.509 TLS certs
+	// on remote federation endpoints. This is not recommended in production!
+	DisableTLSValidation bool `yaml:"disable_tls_validation"`
+
+	Proxy Proxy `yaml:"proxy_outbound"`
+}
+
+func (c *FederationSender) Defaults() {
+	c.Listen = "localhost:7775"
+	c.Bind = "localhost:7775"
+	c.Database.Defaults()
+	c.Database.ConnectionString = "file:federationsender.db"
+
+	c.FederationMaxRetries = 16
+	c.DisableTLSValidation = false
+
+	c.Proxy.Defaults()
+}
+
+func (c *FederationSender) Verify(configErrs *ConfigErrors, isMonolith bool) {
+	checkNotEmpty(configErrs, "federation_sender.listen", string(c.Listen))
+	checkNotEmpty(configErrs, "federation_sender.bind", string(c.Bind))
+	checkNotEmpty(configErrs, "federation_sender.database.connection_string", string(c.Database.ConnectionString))
+}
+
+// The config for setting a proxy to use for server->server requests
+type Proxy struct {
+	// Is the proxy enabled?
+	Enabled bool `yaml:"enabled"`
+	// The protocol for the proxy (http / https / socks5)
+	Protocol string `yaml:"protocol"`
+	// The host where the proxy is listening
+	Host string `yaml:"host"`
+	// The port on which the proxy is listening
+	Port uint16 `yaml:"port"`
+}
+
+func (c *Proxy) Defaults() {
+	c.Enabled = false
+	c.Protocol = "http"
+	c.Host = "localhost"
+	c.Port = 8080
+}
+
+func (c *Proxy) Verify(configErrs *ConfigErrors) {
+}