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example_test.go
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example_test.go
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package harpy_test
import (
"context"
"net/http"
"sync"
"github.com/dogmatiq/harpy"
"github.com/dogmatiq/harpy/transport/httptransport"
)
// Example shows how to implement a very basic JSON-RPC key/value server using
// Harpy's HTTP transport.
func Example() {
var server KeyValueServer
// Start the HTTP server.
http.ListenAndServe(
":8080",
httptransport.NewHandler(
harpy.NewRouter(
harpy.WithRoute("Get", server.Get),
harpy.WithRoute("Set", harpy.NoResult(server.Set)),
),
),
)
}
// KeyValueServer is a very basic key/value store with a JSON-RPC interface.
type KeyValueServer struct {
m sync.RWMutex
values map[string]string
}
// GetParams contains parameters for the "Get" method.
type GetParams struct {
Key string `json:"key"`
}
// SetParams contains parameters for the "Set" method.
type SetParams struct {
Key string `json:"key"`
Value string `json:"value"`
}
// Get returns the value associated with a key.
//
// It returns an application-defined error if there is no value associated with
// this key.
func (s *KeyValueServer) Get(_ context.Context, params GetParams) (string, error) {
s.m.RLock()
defer s.m.RUnlock()
if value, ok := s.values[params.Key]; ok {
return value, nil
}
return "", harpy.NewError(
100, // 100 is our example application's error code for "no such key"
harpy.WithMessage("no such key"),
)
}
// Set associates a value with a key.
func (s *KeyValueServer) Set(_ context.Context, params SetParams) error {
s.m.Lock()
defer s.m.Unlock()
if s.values == nil {
s.values = map[string]string{}
}
s.values[params.Key] = params.Value
return nil
}